镀锌板无飞溅点焊电极设计及试验  

Design and experiment of the electrode for spatter-free spot welding of the galvanized steel sheets

作　　者：徐世龙 朱加雷[2] 王吉仁[2] 郭纪贤 

机构地区：[1]北京汽车股份有限公司生技中心,北京101300 [2]北京石油化工学院机械工程学院,北京102600

出　　处：《电焊机》2017年第5期82-84,共3页Electric Welding Machine

基　　金：北京市教育委员会2015年度创新能力提升计划项目(TJSHG2015101017023);2016年北京高等学校高水平人才交叉培养"实培计划"大学生毕业设计(创业类)支持计划

摘　　要：针对传统汽车镀锌板点焊时易产生飞溅以及参数可调范围窄等问题,提出在传统平电极端部设置盲孔以降低飞溅的方法,通过与传统电极镀锌板点焊时的对比试验可知,在电极压力2 kN、焊接时间200 ms时,无飞溅的焊接电流区间为:传统电极6~7 kA,盲孔型电极6.5~9.5 kA,且熔核直径均不小于5 mm,接头抗剪切力高于3.6 kN;盲孔型电极能够有效降低汽车镀锌板点焊时的飞溅、毛刺等质量问题,满足焊接质量要求的可选参数范围宽,对改善点焊质量及提高参数调试效率有一定的实用意义。In the spot welding of galvanized sheet steel in automotive industry,the spatter and the nan＇ow range of adjustable welding parameters are important qnality issues. To solve the problem,a new electrode is designed,having a small blind hole on the tip of the traditional flat tip electrode. The test results show that under the fixed condition of 2.0 kN electrode force and 200 ms welding time ,the intervals of welding current with spatter-free of the new electrode and traditional one are 6.5-9.5 kA and 6-7 kA,respectively. Furthermore the nugget size is not less than 5 mm and the tensile shear strength is greater with the new electrode. The new electrode having a small hole on the tip reduces welding spatter effectively and widens the parameter range,with which it is possible to improve the spot welding quality and the efficiency of automotive body assembly and to reduce the reworking in the shop.

关 键 词：汽车 点焊 镀锌板 电极 飞溅 

分 类 号：TG457.2[金属学及工艺—焊接]