摘要
针对汽车镀锌钢板CMT铜钎焊焊缝缺陷的敏感性问题,采用1.5 mm厚镀锌钢板搭接焊接的方法进行试验,主要以润湿性、焊接过程中是否存在飞溅、焊缝成形和镀锌层烧损情况作为评价铜钎焊焊接缺陷敏感性的指标,得到试验条件下缺陷敏感性较小时的工艺窗口:镀锌钢板搭接间隙为0~1 mm、电流为125~152 A时能获得合格的焊缝。通过改变点焊后不同气体保护时间确定焊缝表面变黑是由于焊缝在高温下被氧化生成氧化铜。
Lap welding is operated with 1.5 mm thickness galvanized steel sheets to study the weld defect sensitivity of CMT brazing galvanized steel sheets for automobile. Four evaluation criteria are carried out to judge the weld defects sensitivity of brazing, which are wettability,spatters during weld process,weld geometry and burn-off of zinc deposits. And weld proeess window with few defects is obtained,that lap gap range is from 0 mm to 1 mm and current range is from 125 A to 152 A. Besides,through changing different shielding gas protection times after spot welding, a fact is confirmed that the dark substance on the brazing seam surface is due to the occurrence of CuO under high temperature.
出处
《电焊机》
2017年第4期29-33,共5页
Electric Welding Machine
关键词
CMT铜钎焊
镀锌钢板
缺陷敏感性
氧化
CMT brazing
galvanized steel sheet
defect sensitivity
oxidation
