激光拼焊板成形性能的试验研究

在本研究中 ,对汽车用冷轧钢板在激光焊接后成形性能进行了细致的分析。杯突试验表明 ,被焊钢板厚度的差异对杯突值降低的影响较大 ;极限拱顶高和扩孔试验表明 ,随被焊钢板厚度差异和强度差异的增加 ,成形性能会有较大程度的降低。成形极限图试验研究同样表明 ,冷轧钢板激光焊接后 ,其成形性能较母材有所降低 ,激光焊接的成形位置应避开零部件变形的复杂部位

Experimental study on formability of blanks after laser welding

In this paper, the formability of cold rolled steels after laser welding were analyzed. Cupping test show that the difference of thickness of welded blanks can lead to the reduction of IE to a large extent while LDH and Hole Expansion test indicate that the formability of welded blanks reduced with the increase of difference of thickness and strength. FLD of welded blanks also displayed that the formability of cold rolled blanks after laser welding dropped compared with those of the base metal. The location of forming for laser welded blanks should avoid from the complex situation of forming for auto parts.