多丝埋弧焊焊缝裂纹解析  

Weld crack analysis of multiple wire submerged-arc welding

作　　者：钱伟方[1] 

机构地区：[1]宝山钢铁股份有限公司研究院,上海201900

出　　处：《宝钢技术》2013年第1期19-23,共5页Baosteel Technology

摘　　要：裂纹是焊接中常见的一种缺陷。在多丝埋弧焊对接焊板试验中发现焊缝横向裂纹,通过对该裂纹的微观解析,发现裂纹断面上存在大量的"鱼眼"形貌,判断该裂纹是氢致裂纹。导致该裂纹产生的主要原因是焊缝内扩散氢与焊接残余应力的综合作用,在焊接时通过控制扩散氢的来源来防止氢致裂纹的产生。Cracks are a common defect in welding. In a test for the multiple wire submerged-arc butt-welded plate, transversal cracks were found in the weld. Based on the micro-analysis of the cracks, it was found that there were a large number of＂fish eyes＇on the cross section of the cracks. It was thus judged that the cracks were hydrogen induced ones, which were mainly caused by the combined effect of the diffusion hydrogen and residual stress in the weld. Therefore, if the source of the diffusion hydrogen can be controlled during welding, the occurrence of hydrogen induced cracks will be prevented.

关 键 词：多丝埋弧焊 裂纹 残余应力 扩散氢 管线钢 

分 类 号：TG441.7[金属学及工艺—焊接]