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镀锌板CMT焊焊缝气孔影响因素及产生机理
李超豪, 华学明, 张跃龙, 顾勇, 徐泽林
作者单位E-mail
李超豪, 华学明, 张跃龙, 顾勇, 徐泽林  mebiuslee_1993@163.com;xmhua@sjtu.edu.cn 
摘要:
镀锌板在车身材料中得到广泛应用,但其熔化极气体保护焊(GMAW, gas metal arc welding)存在气孔缺陷. 从焊接电流模式、焊枪行进倾角、预留间隙、焊接保护气体成分和焊接电流焊接速度匹配等几个方面,研究其对镀锌板弧焊焊缝气孔影响规律及其气孔产生的机理,用X射线探伤对内部气孔进行观察统计. 结果表明,冷金属过渡(CMT,cold metal transfer)焊由于其低热输入,内部气孔少,适合焊接镀锌板;焊枪行进倾角选用后倾焊(焊枪指向待焊区域)为佳;预留间隙可以显著抑制气孔产生;保护气体中加入适量CO2可以减少气孔;焊接速度加快会减小气孔尺寸,但数量会有所增多.
关键词:  镀锌板|气孔|CMT焊
DOI:10.12073/j.hjxb.2019400019
分类号:
基金项目:
Study on influence factor and formation mechanism of porosities in CMT welding of galvanized steel sheet
LI Chaohao, HUA Xueming, ZHANG Yuelong, GU Yong, XU Zelin
Abstract:
Galvanized sheet has been widely used in automobile industry. However, there are many porosities in the welds of GMAW (gas metal arc welding). In this paper, the effects of welding process, torch moving angle, gap, shielding gas composition and welding speed on porosities were studied systematically. The internal porosities were observed and statistically analyzed by X-ray radiographic inspection. The results showed that CMT (cold metal transfer) welding was suitable for galvanized sheet and had less porosities because of its low heat input. It was better for porosities by using backward-welding (the welding torch points to the unwelded area), leaving the gap, and adding appropriate amount of CO2 to the shielding gas. And higher welding speed produced more porosities with smaller size.
Key words:  galvanized steel sheet|porosity|CMT welding