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Abstract
A series of experiments was carried out so as to elucidate the effect of the phase transformation in the cooling process on welding distortion and residual stress generated by laser beam welding (LBW) and laser-arc hybrid welding (HYBW) on the high strength steel (HT780). Then, the experiments were simulated by 3D thermal elasticplastic analysis with FEM (Finite Element Method) which was performed with using the idealized mechanical properties considering the transformation superplasticity. From the results, the effects of the phase transformation on welding distortion and residual stress generated by LBW and HYBW were elucidated. Furthermore, the generality of the idealization of the mechanical properties was verified.
Highlights
For improving function and reducing weight of steel structures, aggressive use of high strength steel has been tried
The results indicate that the phase transformation in the cooling process largely affects and controls the welding distortion
In order to investigate the effects of the phase transformation on the generation of welding distortion and residual stress of laser beam welding (LBW) and hybrid welding (HYBW), the experiment was carried out
Summary
For improving function and reducing weight of steel structures, aggressive use of high strength steel has been tried. In order to achieve this trial, it is essential that the performance of joints of high strength steel is improved. (2014) FEM Simulation of Distortion and Residual Stress Generated by High Energy Beam Welding with Considering Phase Transformation. For this objective, researches of joining with laser beam have been conducted [1]. Joints with high quality can be manufactured by laser beam welding (LBW), it requires quite severe gap control between welded plates for avoiding generation of under fill. Application of laser-arc hybrid welding (HYBW) has been investigated for improving manufacture efficiency. By supplying deposit metal by arc welding, the gap control of HYBW is expected to be easier than that of LBW without deposit metal
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