摘要
采用激光-TIG复合热源填丝焊接新方法焊接高速列车用6005A铝合金,对复合焊接工艺、接头微观组织、力学性能、断口形貌及焊接热裂纹进行了研究.结果表明,激光功率为2 000~3 000 W、TIG电流为150~195 A、焊接速度为0.4~0.8 m/min时焊接过程比较稳定,熔合比合适,可以获得优良的焊缝成形.焊缝区由焊缝边缘的柱状晶和焊缝中心的等轴晶组成.熔合比γ控制在0.54~0.7范围内时,接头的平均抗拉强度约为193.39 MPa;接头抗拉强度随熔合比的增大而增大,并且γ=0.7时,抗拉强度最大,约为205 MPa,占母材强度的70%.
6005 A aluminum alloy which is used for highspeed vehicle was welded by a new technology of laser-TIG arc hybrid welding with filler wire. According to the research of hybrid welding process,microstructure of the joints,mechanical properties,fracture morphology and welding hot cracking,welding process was relatively stable and welding appearance were perfect when laser power was in the range of 2 000 W to 3 000 W,TIG current was 150-195 A,welding speed was 0. 4 ~ 0. 8 m/min.Welding zone was composed of columnar grains in the edge of welding seam and equiaxed grains in the center of welding seam.The average tensile strength of joint was about 193. 39 MPa and joint tensile strength increased with the increase of penetration ratio. In addition,the maximum tensile strength was about 205 MPa—70% of the strength of base metal when penetration ratio was 0. 7.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第10期51-54,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51475040)
中央高校基本科研业务费专项资金资助项目(FRF-TP-15-004A3)
