“…The thickness of the rolled profiles is much smaller than other dimensions of the profiles in these construction elements. This type of the construction in the working out of deformation-stress analysis can be substituted by shell elements [4,12].…”
The article presents a calculation procedure for determining the maximum permissible load on the welded structure of the transport carriage. During the transport carriages operation inside the production hall there was no breakage of the welding joints. The use of carriages outside the hall and with an uneven surface began to create cracks and fractures in the weld joints. The values of vertical accelerations that were generated by running on uneven surfaces were determined by experimental measurement. To avoid cracks in welded joints, the maximum permissible load value of the transport carriage was subsequently determined by calculation using FEM.
“…The thickness of the rolled profiles is much smaller than other dimensions of the profiles in these construction elements. This type of the construction in the working out of deformation-stress analysis can be substituted by shell elements [4,12].…”
The article presents a calculation procedure for determining the maximum permissible load on the welded structure of the transport carriage. During the transport carriages operation inside the production hall there was no breakage of the welding joints. The use of carriages outside the hall and with an uneven surface began to create cracks and fractures in the weld joints. The values of vertical accelerations that were generated by running on uneven surfaces were determined by experimental measurement. To avoid cracks in welded joints, the maximum permissible load value of the transport carriage was subsequently determined by calculation using FEM.
“…Rojek et al. 4 presented the different methods which can be used to determine the mechanical properties of weld zone in TWBs and suggested that tensile method is one of the best methods. The specimens of the weld zone were tested for tensile properties in uniaxial tension on a 50 kN UTM.…”
Section: Mechanical Properties Of Steel Sheets and Weld Zone In Twbsmentioning
confidence: 99%
“…Mechanical properties of the local weld can be much different from the parent materials but acceptable if optimal welding parameters are employed. 4,5 A typical example of application of a TWB for an automobile body part is shown in Figure 1. Figure 1.Example of a laser-welded and stamped automotive side panel.…”
An analytical model for the prediction of springback in bending of longitudinally welded tailor-welded blanks of different thickness is presented in this paper. The effect of strain hardening, anisotropy and weld zone has been incorporated in the analytical model. Power law of strain hardening and Hill's anisotropic yield criterion have been used in the development of the analytical model for prediction of springback in tailor-welded blanks. The predicted values of springback are validated with experiments on V-bending of laser-welded blanks of Extra Deep Drawing quality steel sheets. Longitudinally welded specimens of three different thickness combinations with weld line oriented at 0 , 45 and 90 to the rolling direction are tested to investigate the effect of anisotropy. The springback values predicted by the analytical model incorporating the weld properties are found to be in good agreement with the experimental results in all of the cases. The springback has been found to be maximum when the weld line is oriented at 45 to the rolling direction.
“…It was also emphasized that heat affected zone (HAZ) should be included in the studies of TWBs. Owing to the fact that standard tests cannot be performed to determine mechanical properties of the weld zone due to small size of the weld cross section in TWBs, Rojek et al 19 presented different methods to determine mechanical properties of the weld zone in TWBs. Khan et al 8 carried out studies on effect of thickness ratio on weld line displacement in deep drawing of aluminium–steel TWBs in three thickness combinations and found that weld line displacement increases with an increase in the thickness ratio.…”
Tailor-welded blanks of interstitial free steel are commonly used in complex automotive skin panels. The presence of weld zone, difference in thickness and high anisotropic behaviour affect forming behaviour of tailor-welded blanks significantly. Therefore, incorporation of anisotropy of the sheets and properties of the weld zone in finite element simulations is very important for accurate prediction of springback in bending of tailor-welded blanks. In this study, experimental and finite element simulations of V-bending were carried out on tailor-welded blanks of three thickness combinations, prepared by Nd-YAG laser welding of interstitial free steel sheets of thicknesses 0.8, 1.2 and 1.5 mm. The orientation of the weld line in longitudinally welded blanks was kept at 0°, 45°and 90°with respect to the rolling direction to study the effects of anisotropy on springback in V-bending. The tensile properties of the weld zone in different thickness combinations were determined and incorporated in finite element simulations for prediction of springback. It was observed that springback results were mainly governed by the springback behaviour of the thicker sheet in a particular thickness combination. Weld zone properties affect the springback of tailor-welded blanks more significantly than the anisotropy of the sheets. Accuracy of predicted values of springback in simulations increased when the properties of the weld zone were incorporated in the material model.
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