摘要
采用冷金属过渡(CMT)技术,以4043 Al Si5焊丝为填充材料,分别在Q235钢板和镀锌钢板上进行点焊。使用扫描电镜、能谱分析研究了焊接接头的显微组织,并从热力学角度分析了界面结构形成机理。结果表明:无论基板采用镀锌钢还是Q235钢,在界面处均会观察到富Si层,其形成符合热力学条件;铝-Q235钢、铝-镀锌钢在较大热输入的情况下两者都可以达到较好的润湿性;其中镀锌钢板中的镀锌层不能起到改善铝-钢润湿性的作用,其主要作用在于蒸发带走热量而相对降低界面上的热输入。
The cold metal transfer spot welding of aluminum and steel was carried out by using 4043 AISi5 as filler metal. The microstructure characteristics of the welded joints were analyzed by SEM and EDS, and the formation mechanism of interface structure was analyzed by thermodynamic theory. The results show that： Si-rich intermetallic layer is observed whether the used substrate is Q235 steel or galvanized steel, and the formation of Si-rich intermetallic layer should satisfy the thermodynamic condition of such A1-Si/Fe systems. The good wettability is observed in the case of big heat input under CMT condition whether the used substrate is Q235 steel or galvanized steel. The galvanized layer has no effects on the wettability of aluminum-steel, but its mean role is to take away heat after evaporation and reduce the heat input on the interface.
出处
《热加工工艺》
CSCD
北大核心
2015年第5期40-43,46,共5页
Hot Working Technology
关键词
铝-钢异种金属
冷金属过渡
界面结构
热力学分析
aluminum-steel dissimilar metals
cold metal transfer
interface structure
thermodynamic analysis
