Abstract
The distribution of the residual stresses in laser beam welded SAE 4130 and the effect of stress relief after various post-weld heat treatments (PWHT) were measured by using the x-ray diffraction method. The mechanical properties and microstructure were also examined. Experimental results show that the tensile residua] stresses increased with the heat input of the laser beam. Most of the residual stresses were relieved by PWHT at 530°C for 2 hours followed by furnace cooling to 50°C. The strength of the as-welded samples decreased in comparison with the base metal. The yield strength of the weldment increased after PWHT at 320°C for 2 hours in comparison with the as-welded sample. The elogation of the laser beam welded samples increased after PWHT in comparison with the as-welded samples.
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