Abstract
Aiming at the serious crack phenomenon of automobile rim butt welding in a domestic wheel plant, means of analysis such as chemical analysis, tensile test, bending test, macrocosmic and microcosmic examination were used to find out the formation mechanism. Results showed that the chemical compositions and mechanical properties of base metal near the weld fracture meet the quality requirements, while the widmanstaten structure and composite oxide inclusion covered in unmelted region, which could cause micro-cracks in the welded seam and lower the plasticity of welding seam, were the key reasons to cause cracks of welding.
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