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             \author[1]{Wellington Augusto Dos  Santos}

             \author[2]{Etiene Pereira de  Andrade}

             \author[3]{Guilherme Souza  Assunção}

             \author[4]{Gilmar Cordeiro  da  Silva}

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\date{\small \em Received: 14 December 2019 Accepted: 2 January 2020 Published: 15 January 2020}

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\begin{abstract}
        


The increase in economic and technological competitiveness means that the automobile industry seeks constant innovation in its production methods and processes, in order to produce lighter, safer and more efficient vehicles. Products with greater mechanical resistance, better conformability, thickness combinations of plates / materials are sought with a focus on reducing mass and increasing the rigidity of the vehicle body. In this scenario, Tailor Welded Blank (TWB), which is a top welding technique (by unconventional processes) of sheets of different specifications (materials, thicknesses and / or coatings), appears as a solution, as it allows localized distribution of mechanical properties, mass, optimizing the relationship between structural rigidity and the total weight of the vehicle body. The great challenge of this technique is to combine two processes with completely different demands, welding and mechanical forming. Due to the complexity of forming TWBs, the use of simulations has been widely adopted. In this review, different results of the numerical simulation methods used for a Tailor Welded Blank are compared, focusing on the details and the influence of the parameters used.

\end{abstract}


\keywords{numerical simulation; tailor welded blank.}

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\let\tabcellsep& 	 	 		 
\section[{Introduction}]{Introduction}\par
ailor Welded Blank (TWB) is the combination of two or more metal sheets joined through the welding process, as shown in FIG. \hyperref[fig_0]{1}.There is possible to get a part with different materials, thicknesses, mechanical properties and coatings. This process leverages the global market in several sectors and especially the automotive market, due to the advantage of reducing production costs, weight and improving the structural performance of the vehicle. \hyperref[b0]{[1,}\hyperref[b2]{2,}\hyperref[b7]{3,}\hyperref[b14]{8]}.\par
Source: (Adapted from ZHANG et al, 2016.)  However, despite the advantages conferred by the use of TWB, their application can be considered complex, involving several variables and some complications. The most common problems are splits in the weld region, injurious levels of residual stresses, reduced formability in and displacement of the weld line during forming \hyperref[b2]{[2,}\hyperref[b7]{3,}\hyperref[b14]{8]}.\par
To avoid the occurrence of failures, some adjustments are made to the dies and recently was worked finite element analysis simulations in computer. However, given the complexities of modeling conventional of TWBs, the levels of correlation are not always the best. Numerical modeling of TWBs is more complicated than the modeling of conventional sheet metal forming processes. The great difficulty in performing the numerical modeling in the TWBs conformation is due to the mechanical properties caused by the welding process, and the non-uniformity of the base materials. \hyperref[b7]{[3,}\hyperref[b8]{4,}\hyperref[b9]{5]}.\par
This paper aims to provide an overview of the use of numerical modeling techniques for different simulations in TWBS, listing the advantages and disadvantages in industrial application, as well as the challenges and research activities. 
\section[{II.}]{II.} 
\section[{Numerical Simulation Methods in Sheet Forming}]{Numerical Simulation Methods in Sheet Forming}\par
The appearance of the finite element methods (FEM) occurred in the aerospace industry in the early 1950s, as a powerful numerical tool for solving mathematical engineering and physics problems, improvement the numerical resolution of a system of partial differential equations. One of the reasons why the FEM has been successful since the beginning of its formulation is its basic concept of discretization that produces many simultaneous algebraic equations that are generated and solved with the help of computers \hyperref[b10]{[6,}\hyperref[b11]{7,}\hyperref[b14]{8]}.\par
Due to the complexity of the sheet forming process, mainly in the deep-drawing operation, a fact, which led the engineers and designers, incorporate the FEM to development, seen the need to reduce the time and costs in the modelling of a new project. \hyperref[b10]{[6,}\hyperref[b14]{8,}\hyperref[b84]{55,}\hyperref[b97]{62,}\hyperref[b98]{63]}.\par
The representations of the effects of the contours of the elements in the sheets forming must be considered for permanent deformations and major changes in the geometry of the product. For this, it is necessary to use interpolation functions, which are curves built from known values, which in this case are the degrees of freedom of the element nodes. \hyperref[b10]{[6,}\hyperref[b11]{7,}\hyperref[b15]{9,}\hyperref[b84]{55,}\hyperref[b97]{62]}.\par
During the stamping of a product, the blank is subjected to a complex historical deformation and varied boundary conditions. Because of this loading history, the theory should describe the deformation of the blank that can be discretized as bi or threedimensional. Three different classes of elements can be used in the printing simulation: MEMBRANE, SHELL and SOLID \hyperref[b10]{[6,}\hyperref[b15]{9]}.\par
The membrane elements have three degrees of freedom of translation per node, in the direction that two nodes are tangent and a force is normal to knot. The orientation of the normal force at the node is determined by averaging the normal forces adjacent to the element. The geometry of the sheet is adjusted through the contact of the tools. However, this method is not recommended for calculating elastic return (spring back), as it does not accurately represent the simulated values \hyperref[b11]{[7,}\hyperref[b15]{9]}.\par
The shell elements have a knot with five degrees of freedom: three of translation for the two tangent vectors and the normal vector, and two rotations with the tangent vectors on the axis of rotation. The shell element is an element capable of calculating bending and has membrane characteristics. Loading in flat and perpendicular directions is allowed. All shell element formulations have an arbitrary number of integration points along the thickness of the sheet. It is recommended for all stamping operations, but it does not express accuracy for sheets of high thickness \hyperref[b10]{[6,}\hyperref[b11]{7,}\hyperref[b15]{9]}.\par
The 3D or solid elements represent all degrees of freedom and the results of a simulation with this element allow an accurate visualization of stresses and strains through the thickness and with precise spring back data. Results of a simulation with solid elements help to visualize the material's behavior in problematic regions. The disadvantage of this method is the processing time, as there are solid elements in the thickness that generate a model with many more elements, which does not happen when we use the shell elements \hyperref[b11]{[7,}\hyperref[b15]{9]}. 
\section[{III. Numerical Modeling Methods in}]{III. Numerical Modeling Methods in}\par
Tailor Welded Blanks\par
Numerical modeling in TWBs is more complicated than modeling of conventional sheet metal forming processes, mainly due to the change in mechanical and elastoplastic properties caused by the welding process and the difference in thickness between the base materials \hyperref[b9]{[5,}\hyperref[b16]{10,}\hyperref[b19]{11,}\hyperref[b24]{12,}\hyperref[b96]{61]}.\par
The modeling of TWBs by finite elements there are two methods: the first takes into account the weld line (TAZ -Thermally Affected Zone and WZ -Weld Zone), with a much more refined and precise mesh. The second neglects the effects of welding \hyperref[b28]{[13]}. The first applies only in situations in which there is no localized strain of great intensity in the weld \hyperref[b9]{[5,}\hyperref[b19]{11,} {\ref 14,}\hyperref[b96]{61,}\hyperref[b97]{62]}.\par
The simplification of the first method may cause a relative discrepancy between the practical and the simulated results. This is because in these models the Tailor Welded Blank Forming Limit Diagram (FLD) is not taken into account, but only the base materials. There is then another challenge to be overcome: prediction of the FLD of a TWB considering the local and global effects of the weld  {\ref [15,}\hyperref[b94]{59]}.\par
The conventional methods, using stamping software (such as PAMSTAMP®, for example), there is a level of accuracy higher than 94\%, which is considered excellent. When working with the stamping of TWBs, this correlation is reduced to 78\%, which explains the difficulty in predicting failures \hyperref[b33]{[16]}.\par
There are several parameters that directly influence the numerical modeling of TWBs. Welding processes can significantly change the mechanical properties of materials in weld zone (WZ) and Heat Affected Zone (HZA). However, materials should not be considered as uniform. To survey the parameters to be adopted in the numerical simulation, the results of experimental tests are necessary, revealing the localized mechanical behavior, such as the flow limit and the plasticity parameters of the regions affected by the welding process \hyperref[b16]{[10,}\hyperref[b19]{11,}\hyperref[b9]{5]}.\par
The Plasticity is the area of mechanics that relates the calculation of stresses and strains in a body, which needs to be relatively ductile, permanently deformed by a set of applied forces. The theory is based on experimental observations on the macroscopic behavior of metals in uniform states of combined stresses. The results obtained are then idealized in mathematical equations that describe the behavior of metals under complex tensions \hyperref[b34]{[17,}\hyperref[b35]{18,} {\ref 19,}\hyperref[b9]{5,}\hyperref[b94]{59}].\par
However, it is necessary to develop more techniques that are experimental and analytical methods to quantitatively assess the mechanical characteristics of the welded metal and the formability of TWBs. Effects such as strain hardening during shaping and anisotropy of welded metal, for example, must be taken into account \hyperref[b36]{[20]}.\par
For mechanical characterization of Tailor Welded Blanks, tensile tests have been adopted, with specimens of different configurations, to feed numerical simulations and to be confronted with the so-called Mixture Rule \hyperref[b37]{[21,}\hyperref[b38]{22]}. In this case, we work with the ASTM E-8M standard \hyperref[b7]{[3]}.\par
The Mixtures Rule is used to extract properties from the weld, aiming to verify its influence on the mechanical properties and the elongation of the TWB. Thus, the load proportions supported by the weld and the base metal are calculated, assuming homogeneous deformation uniformity for the three materials \hyperref[b7]{[3,}\hyperref[b14]{8]}.\par
Than those referred to mechanical effects, we also deal with micro structural issues related to welding in the Weld Zone. The changes, depending on the materials used, can be considerable. It is generated from a local softening of marten site to complex phase transformations in conditions imbalance, depending on the welded materials, the process and the welding parameters \hyperref[b37]{[21,}\hyperref[b39]{23]}.\par
The two most used criteria in the numerical modeling of TWBs are based on the Theory of Plasticity: Yield and isotropic hardening. Different models of isotropic hardening in which the plastic deformation largely exceeds the yield, can be used in the modeling of Tailor Welded Blanks \hyperref[b16]{[10,}\hyperref[b19]{11,}\hyperref[b11]{7]}. However, Holloman's equation is the simplest and most widely used model, and can be expressed as: Where: ? ?= is the true stress ? K = is the resistance coefficient ? ?? ?? = is the true strain ? ?? = is the strain hardening coefficient After the linearization of the Holloman equation, the strain-hardening coefficient can be determined, which is a key parameter to obtain the maximum deep drawing limit in the inlay operations. The higher the strain hardening coefficient, the greater the capacity of the material to strain, without the occurrence of necking down.? = K? p n (1) © 2020 Global Journals\par
If there is a quantitative relationship between strain rate and yield stress, the Ludwik model can be used, which is a modification of the Holloman equation. In cold work, the yield stress is high at each strain level, mainly due to the strain-hardening phenomenon, so the yield stress is added to the equation \hyperref[b16]{[10,}\hyperref[b19]{11,}\hyperref[b9]{5}]. Ludwik's law can be expressed as:?? = ?? ?? ???? ?? ?? (2)\par
Where:? ??= is the true stress ? ?? ?? = is the yield stress ? ?? = is the resistance coefficient ? ?? ?? = is the true strain ? ?? = is the strain hardening coefficient\par
The equations can be used so much to forming the TWBs how much for the base metal of the weld. If there is a need to consider the pre-strained material, the Ludwik model can also be modified \hyperref[b16]{[10,}\hyperref[b19]{11,}\hyperref[b9]{5}]. Ludwik's law is modified and can be expressed as the Swift Equation:?? = ?? ?? K ??? ??+ ?? 0 ? ?? (3)\par
Where: ? ??= is the true stress ? ?? ?? = is the yield stress ? ?? = is the resistance coefficient ? ?? ?? = is the true strain ? ?? 0 = is the true strain rate ? ??= is the strain hardening coefficient A model widely used in the literature to describe the behavior of metals, such as aluminum, is the Voce equation, which takes into account the three parameters: initial yield stress, maximum stress and relaxation strain in the dynamic recovery regime. Such equation is described as: ? = A ? Bexp(?C? p )\textbf{(4}? ?? = is non-dimensional\par
For metals such as aluminum and ferritic stainless steels, once recovery is established, its effect is sufficiently efficient to contain hardening strain and the forming stress curve follows a horizontal line. Strains rates for both are omitted in FEM analysis of TWBs. However, one can simply take into account the effect of the strain rate, by multiplying the hardening strain law by a term like ????? \hyperref[b16]{[10,}\hyperref[b35]{18,}\hyperref[b41]{24]}.\par
Steel sheets, due to the rolling process, have a very significant anisotropy. This can influence data entry for numerical simulation, so it is extremely important to analyze the best yield criterion to be used in experimental tests \hyperref[b41]{[24,}\hyperref[b16]{10,}\hyperref[b42]{25,}\hyperref[b44]{26]}.\par
However, the importance of anisotropy in the process of forming TWBs, the isotropic criterion of Von Mises and Gurson -Tvergaard -Needleman (GTN) are still frequently used. Von Mises formulated a flow criterion suggesting that this phenomenon occurs when the second invariant of the deviation stresses reaches a critical value. \hyperref[b16]{[10,}\hyperref[b24]{12,}\hyperref[b44]{26,}\hyperref[b49]{27]}. The Von Mises model can be expressed as:? ?? 2 ? 1 ?2 ?? (??)\textbf{(5)}\par
Where: ? ??= depends on the hardening strain parameter ? ??= is the radius of the yield surface The second invariable tensor is given as:?? = ? ?? 2 = ? 3/2 ??: ?? = ? 3/2 ?? ???? ?? ???? = ?? ???? = ?? ???? ? ?? ?? ?? ????\textbf{(6)}\par
Where: ? ?= is the equivalent stress ? ?? ???? = is the Kronecker delta, in matrix form, corresponds to the identity matrix Hill's model is proposed for the yield of an anisotropic material and is assumed to be a quadratic function of the stress space. This is can be expressed as:??(?? 22? ?? 23 ) 2 + ??(?? 33? ?? 11 ) 2 + ??(?? 11? ?? 22 ) 2 + 2???? 23 2 + 2???? 31 2 + 2???? 12 2 = 1\textbf{(7)}\par
Where: ? ??, ??, ??, ??, ??, ?? = are experimentally determined coefficients\par
The yield surface is defined using the three values r ( ?? 0, ?? 45, ?? 90, ) and the initial yield stress in the rolling direction \hyperref[b16]{[10,}\hyperref[b19]{11,}\hyperref[b24]{12,}\hyperref[b42]{25,}\hyperref[b94]{59}]. If the biaxial factor is equal to 1 it is the classic Hill-48 model. Applied to flat tension the criterion can be used as: \par
In the case of normal anisotropy, the flat stress version of Hill's 1948 yield criterion can be written as:? 1 2 + ? 2 2 ? 2R 1+R ? 1 ? 2 = ? y,1 2 , R 90 = R 0 = R 45\textbf{(11)}\par
In 1979, Hill proposed a generalized nonquadratic criterion to explain an "anomalous" observation in some aluminum alloys, where the yield forces in biaxial stress were superior to the yield forces in uniaxial stress (which is not allowed by Hill's test 1948) \hyperref[b11]{[7,}\hyperref[b16]{10,}\hyperref[b24]{12,}\hyperref[b50]{28]}. The proposed model:F|? 2 + ? 3 | m + G |? 3 ? ? 1 | m + H|? 1 ? ? 2 | m + L|2? 1 ? ? 2 ? ? 3 | m + M|2? 2 ? ? 3 ? ? 1 | m + N |2? 3 ? ? 1 ? ? 2 | = ? y m\textbf{(12)}\par
Where: ? ??, ??, ??, ??, ??, ?? = are experimentally determined coefficients ? m = can be calculated from the non-linear relationship ? ?? ?? ?? = is the uniaxial yield stress\par
Other yield criteria can be derived from this model assuming combinations of experimental parameters \hyperref[b16]{[10]}. Hosford elaborated his generalized criterion for Hill's yield and can be obtained considering L = N = 0. \hyperref[b16]{[10,}\hyperref[b50]{28]}. So for a flat isotropic material we get:1 1+R (|? 1 | m + |? 2 | m ) + R R+1 |? 1 ? ? 2 | m = ? y m (\textbf{13})\par
Where: ? ?? ?? ?? = is the uniaxial yield stress ? ?? = is the coefficient of Lankford For a non-isotropic material, the Hosford criterion is treated by:G|? 2 ? ? 3 | m + G|? 3 ? ? 1 | m + H|? 1 ? ? 2 | m = 1 (14)\par
Where: ? ??, ??, ?? = are the coefficients of Lankford ? m = can be calculated from the non-linear relationship\par
The Barlat model is formulated in the stress space. The yield surface is defined using the Lankford coefficients (?? 0, ?? 45, ?? 90, ) and the exponent m. he Barlat model was specially developed for the description of aluminum alloys.  {\ref [10.19.28]}. It is also a generalization of the Hosford criterion for the case where the directions of the orthotropic axes:?? = (3I 2 ) m 2 ??2cos ? 2??+?? 6 ?? ?? + ?2cos ? 2???3?? 6 ?? ?? + ?2cos ? 2??+5?? 6 ?? ?? ? = 2?? ?? (15)\par
Where: ? ? = arccos ???2/??3 3/2 ? with the second and third stress determining invariant ( I 2 I 3 ) re used using Bishop-Hill notation. 
\section[{? m = represents the number of experimental r values}]{? m = represents the number of experimental r values}\par
The yield model of Gurson Tvergaard Needleman (GTN) are generalizations of two models are the isotropic of Von Mises and Hill 1948 \hyperref[b16]{[10,} {\ref 19,}\hyperref[b44]{26,}\hyperref[b49]{27,}\hyperref[b50]{28]}. For the isotropic model, we have: Where: ? ? eq = is the equivalent stress of Von Mises ? ? y = is the yield stress of material ? ? H = is the Hydrostatic stress of material ? q 1 , q 2, q 31 = are material parameters determined experimentally? = ? ? eq ? y ? 2 + 2q 1 ?? cos ? ??q 2 3? H 2? y ? ? (1 + q 3 ?? 2 ) = 0 (16) © 2020 Global Journals\par
For the modified criterion presenting the anisotropy parameters, we have:? = ? ? eq ? y ? 2 + 2q 1 ?? cos ? ??q 2 ? 1+2?? 6(1+??) 3? H ? y ? ? (1 + q 3 ?? 2 ) = 0\textbf{(17)}\par
Where:\par
? ? eq = is the equivalent stress of Von Mises ? ? y = is the yield stress of material ? ? H = is the Hydrostatic stress of material ? q 1 , q 2, q 31 = are material parameters determined experimentally ? R = are the coefficients of Lankford\par
The numerical simulations used with this criterion are performed to describe the damage to the materials, which involves the triaxiality of the stress, that is, the law is based on the physical ductile fracture mechanism, that is, empty nucleation, growth and coalescence \hyperref[b9]{[5,}\hyperref[b11]{7,}\hyperref[b16]{10,} {\ref 19,}\hyperref[b44]{26,}\hyperref[b50]{28]}. 
\section[{IV. finite elements method for modeling of twbs}]{IV. finite elements method for modeling of twbs}\par
One of the main objectives in applying a virtual analysis (figure \hyperref[fig_7]{4}) is to calculate the movement of the weld line and provide an ideal force balance between the punch and blankholder. The results of this combination aim to control the flow of the blank to be forming, avoiding the movement of the weld line and thus reducing the high tensile stresses perpendicular to the weld line \hyperref[b51]{[29,}\hyperref[b96]{61,}\hyperref[b97]{62,}\hyperref[b84]{55]}.  As the weld line moves to critical deep areas of inlay, the forming of the blank decreases. In some studies developed to control this situation, several tests have been carried out to decrease the strain in the thicker material, from increasing the flow of the thicker material and even reducing the stamping force on the thinner material. For that, the concept of draw beads was worked and pressure points were controlled in isolated quadrants of the blank holder \hyperref[b0]{[1,}\hyperref[b96]{61,}\hyperref[b97]{62]}.\par
Adony and Chen cited by Gautam found a strong correlation between the ductility of the weld and the limiting dome height for longitudinally welded TWBs, doing flat stretch, with original materials of similar thickness and different materials and coating combinations. The Limiting Drawing Ratio (LDR) for a TWB is between the values of the thinnest and thickest sheet if the thickness ratio is different from the unit \hyperref[b52]{[30,}\hyperref[b54]{31]}.\par
According to research carried out by R. Safdarian and M. J. Torkamany, he describes that after the experimental tests carried out; the different thicknesses of the TWBs were modeled in the ABAQUS® program. The Finite Elements Method (FEM) was used to construct Forming Limit Diagram (FLD) based on the Hecker principle. In the physical cupping tests, the Limit Dome Height parameter was used, as shown in figure 5 \hyperref[b42]{[25]}.\par
For simulation, the following data were collected from the materials that make up the TWB: Yield Strength (YS), Ultimate Tensile Strength (UTS), hardening exponent (n), hardening coefficient (K) , total elongation and anisotropy coefficient (R 0 , R 45 , R 90 ) \hyperref[b42]{[25]}.\par
In the modeling, the Punch, Die and blankholder were considered as rigid items. The TWBs were modeled as a shell element with S4R elements, maintaining the left and right side weld line inclination between 20 ° and 45 °. The calculation of stresses and strains was based on the Hill criterion (1948) and a flat state of strain was sought. To perform the tests, the use of a 20-ton hydraulic press is suggested \hyperref[b42]{[25]}.\par
The experimental results show that the greater the difference in thickness and mechanical strength between the materials that make up the TWB, the greater the movement of the weld line. As a consequence, the lower the stamping of the TWB will be, which is reflected in a lower Limit Dome Height (LDH), as shown in figure  {\ref 5}  In general, the greater the difference in thickness and mechanical strength between the materials that make up the TWB, the greater the movement of the weld line. Consequently, less tends to be its conformability \hyperref[b42]{[25]}.\par
According to research by Masumi, Nakajimacupping tests, tensile tests and simulations were performed to correlate the values obtained experimentally. In the simulations, the effects of welding on WZ and HAZ were not considered. The weld line was referred to only as the dividing point between the two materials that made up the TWB. For a better correlation, it was necessary to use the anisotropy criteria and parameters \hyperref[b9]{[5,}\hyperref[b55]{32]}.\par
In the work developed by Gautam, for the TWB, the simulation was performed on half the blank, being obtained for a complete blank using the principle of symmetry on the X-Y plane, this is technique was applied to reduce the size of the problem and the time of the simulation. The FEM analysis of the base material sheet was also performed to compare the LDH values obtained in each case \hyperref[b52]{[30,}\hyperref[b54]{31]}.\par
Hill's plasticity model, also known as Hill's yield potential, which is an extension of the Von Mises function for anisotropic materials, was used in finite element modeling to incorporate sheets anisotropy.\par
Figure \hyperref[fig_9]{7} shows the mesh and elements used for simulation in Gautam's work. Gautam's experimental results showed that LDH is higher in the thicker sheet than in the less thick sheet, indicating greater formability of the thicker sheet. Similar results were observed in the simulations, although higher LDH values were obtained in a simulated manner \hyperref[b52]{[30,}\hyperref[b54]{31]}. 
\section[{Source: Adapted from Gautam et al (2019)}]{Source: Adapted from Gautam et al (2019)}
\begin{quote}
.\end{quote}
\par
The refinement of simulations through experimental tests is of fundamental importance. The failure points predicted for the FLD were captured in the DYNAFORM® software. These points were plotted as major and minor strains for a comparison with the actual stress data obtained from the LDH experiments \hyperref[b52]{[30,}\hyperref[b54]{31]}.\par
Gautam's results showed that the simulation predicts a maximum displacement value of the weld line of 2.45mm, which is lower than the experimental values of 2.57mm. This deviation in the results of the displacement of the weld line obtained by experiments and the numerical results can be attributed to the friction between the punch and the blank \hyperref[b52]{[30,}\hyperref[b54]{31]}.\par
In another study, developed by Korouyeh in interstitial free steel sheets (IF -Interstitial Free) were used to compose a TWB. The numerical investigation of the TWBs forming was done using a commercially available finite element code ABAQUS 6.10 ® \hyperref[b95]{[60]}.\par
The model consisted of a hemispherical punch, blankholder, die and blank. This model was based on the Hecker Forming Limit Diagram (FLD) test. Eight specimens of size 25mmx200mm to 200mmx200mm were cut from the laser-welded sample, so that the weld line was perpendicular to the stretch direction (crosssectional samples)  {\ref [33]}.\par
In the standard cupping tests, the check also took place on the thinner side of the TWB and parallel to the weld line. Figure 8 shows the FLD of the TWB made. It is noticed that the numerical criteria cannot predict the right side of the FLD, being suitable only for the left side, under condition of plane strain.   TWB samples with different widths produce different LDH values, so the dispersion of the LDH test depends on the variation of the stress path at the fracture site. For experiments and numerical criteria, the LDH value is minimum for a 125mm wide sample that is in the plane stress condition  {\ref [33]}.\par
The comparison of the fracture position of the FEM and the experiment shows that there is good agreement for the fracture position predicted by the SDT criterion and experiment. The results show that, due to the increase of the sample width or in the condition of biaxial elongation, the fracture occurs closer to the weld line.\par
In research carried out by Andrade and Santos, the conditions found to be optimal in the tensile test (relative inclination of the 30º and 60º weld line) were simulated. In this work, it was evidenced that the total relative elongation of the weld line would support a maximum strain for an angle of 30 ° in relation to the rolling direction of the base materials. The AutoForm® forming software, from the AutoForm ®Company with triangular meshes, Shell model, friction coefficient 0.15 was used. The materials considered were FEE 210 with 1.10mm and FeP05 0.65mm, both IF. The yield criterion used was based on the Hill 1948 and the Hollomon model \hyperref[b2]{[2,}\hyperref[b7]{3,}\hyperref[b14]{8,}\hyperref[b57]{34]}.    According to the highlighted strain curve, it turns out that the maximum stress peak tends to decrease, indicating that the purely tensile stresses are attenuated. Even that happen the weld line fractures, efforts will are reduced. This indicates the relative improvement in mechanical behavior when tilting the weld line. However, the simulation does not take into account the weld (HAZ and WZ), nor their mechanical properties \hyperref[b2]{[2,}\hyperref[b7]{3,}\hyperref[b9]{5,}\hyperref[b14]{8,}\hyperref[b57]{34]}.\par
In summary, there is then a lack of methods and processes that more accurately determine the effects of the forming about the TWB. It is therefore necessary to develop more experimental techniques and analytical methods to quantitatively evaluate the mechanical characteristics of the welded metal and the formability of TWBs. Effects such as hardening strain during shaping and anisotropy of welded metal, for example, must be taken into account. In this respect, the use of simulations is will growing and aims to overcome the challenges mentioned above.\par
V. 
\section[{Conclusions}]{Conclusions}\par
A review of the TWBs was elaborate and in most of the work done, researchers always adopt a numerical model in their studies that disregards the WZ and the HAZ. This parameter is often adopted due to the limitations of the software's used, due to the high computational cost or the lack of experimental data for the mechanical and micro structural behavior of the weld.\par
Usually the elements of numerical analysis used are the shell, due to its speed of data processing and good precision. However, the inclusion of the Heat-Affected Zone (modeled also by the shell element) does not represent an improvement in the results forming and the localized Springback\textbackslash  effect. The reason is that due greater resistance to yield and Heat-Affected Zone modulus of the weld has an opposite effect to the elastic return.\par
An alternative likely would be to model the weld in 3D solid elements and the base materials by the shell element. Where the movements of the dependent nodes will be interpolated from the movement of independent nodes in the base metal mesh. The solid formulation in the region is the case where the elastic portion of the deformation is not neglected.\par
However, to that, there is a good approximation for numerical modeling, some conclusions are recommended: ? Previous qualification and analysis of the weld, by means of microscopy, either optical or electron beam scanning; ? The weld line must not be worked entirely parallel to the rolling direction (relative inclination of 0º), nor entirely perpendicular (relative inclination of 90º), as it tends to facilitate the propagation of cracks, splits and worsen the mechanical behavior of the TWB;\par
? It is necessary that the base materials work in a balance of forces (FA = FB) and, to satisfy these conditions, disregarding the metallurgical effects. This thickness ratio, the greater than the unit (1.0), the worse the forming, the threshold can be obtained by the equation:LSR = ? ? YB ? TA ? = ? t 0A t 0B ?\textbf{(18)}\par
? The tensile tests, once the weld is qualified, proved to be useful for surveying the mechanical properties of the TWB and the influence of the relative inclination of the weld line on its performance during forming; ? Determination of an optimized curve (FLD) for the three materials, including here the weld region , which is extremely important for the development of TWBs, because with the obtaining of the curve it is possible to previously identify conditions that would lead to plastic instability or even to material failure. The validation of the numerical model requires constant comparison with experimental results, in order to identify possible deviations in the simulation results. Thus, the validation of numerical simulation has a fundamental role in this field of investigation.\par
lobal Journal of Researches in Engineering ( ) Volume Xx X Issue I Ve rsion I\begin{figure}[htbp]
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\noindent\textbf{4}\includegraphics[]{image-9.png}
\caption{\label{fig_7}Figure 4 :}\end{figure}
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\noindent\textbf{51366}\includegraphics[]{image-10.png}
\caption{\label{fig_8}Figure 5 : 13 Figure 6 Figure 6 :}\end{figure}
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       			\footnote{© 2020 Global Journals lobal Journal of Researches in Engineering ( ) Volume Xx X Issue I Ve I Gl rsion I} 			\footnote{© 2020 Global Journals} 		 		\backmatter   			 
\subsection[{Acknowledgments}]{Acknowledgments}\par
The authors would like to thank FIAT Chrysler do Brazil for the technical contribution to this research, Capes (Coordination for the Improvement of Higher Weight) and PUC Minas (Pontifical Catholic University of Minas Gerais) for financially supporting this research and for assisting in the publication of this article. 			  			  				\begin{bibitemlist}{1}
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\end{document}
