摘要
以3 mm厚6082-T6铝合金板为母材进行激光填丝焊接,研究激光功率与焊接速度对焊缝成型、微观组织及力学性能的影响。结果表明,在激光功率为1800 W、焊接速度为0.9 m/min时,焊缝成型最好。接头显微硬度从母材到焊缝中心呈现先减小后增大的趋势,热影响区处存在明显的软化。接头抗拉强度可达300 MPa,伸长率为3.60%。在焊缝背面熔透的条件下,随激光功率增大或焊接速度减小,焊缝的整体成型质量逐渐变好,焊缝中心晶粒尺寸增大,力学性能变差。同时随着激光功率增大,接头气孔数量、尺寸及气孔率均增大。由于6082铝合金本身具有较高的热裂纹敏感性,而且在填丝焊过程中加入Zn,易形成低熔点共晶相,在热循环作用下局部液化导致沿晶开裂。
Taking 3 mm thick 6082-T6 aluminum alloy sheet as the base material,the laser wire filling welding tests were carried out,and the influence of laser power and welding speed on the weld forming,microstructure and mechanical properties was studied.The results show that when the laser power is 1800 W and the welding speed is 0.9 m/min,the weld forming is the best.The microhardness of the joint decreases first and then increases from the base material to the center of the weld,and there is a significant softening in the heat affected zone.The tensile strength of the joint can reach 300 MPa,and the elongation is 3.60%.Under the condition of penetration of the weld back,with the increase of laser power or the decrease of welding speed,the overall forming quality of the weld gradually becomes better,the grain size of the weld center gradually increases,and the mechanical properties of the joint become worse.At the same time,with the increase of laser power,the number and size of weld pores and the porosity increase.Because 6082 aluminum alloy has high thermal crack sensitivity,and Zn is added during the filler welding,low melting point eutectic phase forms,which liquefies locally under thermal cycling and leads to intergranular cracking.
作者
邵明皓
张华
张健
刘德博
张晓峰
朱煦峣
SHAO Minghao;ZHANG Hua;ZHANG Jian;LIU Debo;ZHANG Xiaofeng;ZHU Xuyao(School of Mechanical Engineering,Bejing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Institute of Aerospace Systems Engineering,Beijing 100076,China;Nuclear Industry Engineering Research and Design Co.,Ltd.,Beijing 101300,China)
出处
《热加工工艺》
北大核心
2023年第11期28-32,共5页
Hot Working Technology
基金
国家科技重大专项资助项目(2018ZX04044001)
北京石油化工学院重要科研成果培育资助项目(BIPTACF-009)。
