摘要
以ER4043(AlSi_5)铝合金焊丝为填充金属,采用冷金属过渡(CMT)焊接技术对镀锌钢板和6061铝合金进行搭接点塞焊试验,研究送丝速度和焊接间隙对搭接接头铺展形貌、界面显微组织和接头力学性能的影响.结果表明,CMT点塞焊过程中,送丝速度和焊接间隙对熔核直径以及铺展高度有明显影响.熔焊区由熔化区的柱状晶和热影响区的等轴晶组成,钎焊界面金属间化合物层由层状的Fe_2Al_5和针状的FeAl_3组成,富锌区由富Al的α固溶体和铝锌共晶组成.在最佳工艺参数下,焊接接头最大拉伸载荷达到2.12 kN,接头断裂集中在Fe-Al化合物层和环状富锌层处.
CMT lap spot plug welding of 6061 aluminum alloy to galvanized Q235 steel was carried out using ER4043（ AlSi_5） filler metal. The effects of wire feeding rate and welding gap on the microstructure and mechanical properties of lap joint were investigated. The results indicated that wire feeding rate and welding gap mainly influenced the welding spot diameter and spreading height during CMT lap spot plug welding. The melting area consisted of columnar grains at fusion zone and equi-axed grains at heat affected zone. The brazing area was made up of layered Fe_2Al_5 and needlelike FeAl_3 intermetallic compounds. The zinc-rich area was composed of α-Al matrix and Al-Zn eutectic phase. Tensile strength tests showed that the welding joints fractured in Fe-Al IMC layer and ring-shaped zinc-rich layer with the maximum ultimate tensile load of 2. 12 kN.
出处
《江苏科技大学学报（自然科学版）》
北大核心
2017年第4期443-447,共5页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
关键词
冷金属过渡
熔钎焊
工艺参数
微观组织
力学性能
cold metal transfer
brazing-fusion welding
welding parameter
microstructure
mechanical property
