STUDY ON WELDING CHARACTERISTICS OF COMBINING LASER WELDING AND RESISTANCE SEAM WELDING JOINED TI-6AL-4V LAP JOINTS
Combining laser welding and resistance seam welding (LW-RSEW), lap welding of Ti-6Al-4V alloy plates with 1.4mm thickness was carried out and the welding characteristics of LW-RSEW joint were investigated. The results indicate that, compared with V profile of LW weld, the cross section of LW-RSEW joint is cross profile and the weld width at faying interface is greatly increased, which is correspond to increase the joint shear strength. The LW-RSEW joints fail in the heat affected zone (HAZ) and average tensile shear load is 21.50kN. By means of X-rays inspecting, its found that there is almost no porosity in the LWRSEW joints. The mechanism of porosity elimination was analysed in detail. Furthermore, metallographic examination of the joint reveals that in the nugget the microstructure is coarse β with internally acicular morphology and the HAZ consists of a mixture of primary α and transformed β with some acicular α. Hardness of the HAZ slightly rises compared with base metal (350HV); the hardness in the nugget is highest and the peak value reaches about 425 HV due to the structure transformation to martensite.
Xinge Zhang Liqun Li Zhenglong Lei Yanbin Chen
State Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001, China
国际会议
第三届太平洋国际激光与光学应用会议(PICALO 2008)
北京
英文
341-345
2008-04-16（万方平台首次上网日期，不代表论文的发表时间）