6061铝合金焊接接头液化裂纹分析  

Analysis of liquation crack of 6061 aluminum alloy welded joint

作　　者：崔云龙 汪认 张世欣 张仁航 Cui Yunlong;Wang Ren;Zhang Shixin;Zhang Renhang(CRRC Qingdao Sifang Co.,Ltd.,Qingdao 266111,Shandong,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛266111

出　　处：《焊接》2020年第10期49-52,64,共5页Welding & Joining

摘　　要：6061铝合金角接接头存在裂纹缺陷,根据裂纹的分布特征、显微组织及断口形貌判断该裂纹为液化裂纹。分析认为,该裂纹缺陷有三个重要诱因:材料晶粒尺寸粗大;焊接热输入过高;电弧的磁偏吹导致焊缝形状向上偏离。通过选用晶粒细小的母材、降低焊接热输入、改善焊缝形状,接头液化裂纹的问题得以解决。Cracks were found in 6061 aluminum alloy corner joint.The crack was identified as liquation crack according to the distribution,microstructure and fracture morphology of the crack.The analysis showed that there were three important causes of the crack,coarse grain of the material,high welding heat input and weld shape deviates upward caused by magnetic blow.The problem of liquation crack of the joint was solved by selecting material with fine metal,reducing welding heat input and improving weld shape.

关 键 词：6061铝合金 液化裂纹 粗晶 焊接热输入 磁偏吹 

分 类 号：TG401[金属学及工艺—焊接]