SiC_p/6061铝基复合材料电阻点焊接头中的缺陷分析  

Analysis of the Welding Defects in Resistance Spot Welding of SiC_p/6061Al Composites

作　　者：李杏瑞[1] 牛济泰[1,2] 杨顺成 

机构地区：[1]郑州大学材料科学与工程学院,郑州450001 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [3]正机协合能源装备科技有限公司,郑州450001

出　　处：《机械工程材料》2013年第4期14-16,21,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51245008);科技部中小型企业创新基金资助项目(11C26214105167)

摘　　要：分析了SiCp/6061铝基复合材料电阻点焊接头中的主要缺陷及产生原因。结果表明:复合材料电阻点焊接头中的主要缺陷有氢气孔、热裂纹、焊接喷溅等;氢气孔的产生原因主要是焊前清理不彻底、焊接时间长(0.3s);接头中热裂纹产生的主要原因是焊接电流过大(16kA)造成熔核在不均匀的温度场中结晶,引起焊接应力增加,同时熔池中SiC颗粒使得熔核结晶时黏度增加;焊接飞溅产生的主要原因是由于焊接电流过大(16kA)造成点焊时熔核区局部过热。The main welding defects in the SiCp,/6061AI composile resistance spot welding （RSW） joint and the generating causes were investigated. The results show the main welding defects in lhe composite RSW joint were hydrogen pore, hot crack and welding spatter. That the composites were not cleaned thoroughly and the long welding time（0.3 s） led to the forming of hydrogen pore. The hot cracks forming reason was the excessive welding current （16 kA） which led to the nonuniform temperature field when Ihe nugget crystallized, and the increase of the welding stress. The SiC particles in the welding pool made the increase of the viscosity during lhe nugget crystallization. The local overheating of nugget zone resulted in the excessive current （ 16 kA） was the reason /or welding spatter.

关 键 词：SICP/AL基复合材料 电阻点焊 焊接缺陷 

分 类 号：TG456.9[金属学及工艺—焊接]