纯钛TA2薄板双钨极氩弧焊焊接工艺
Pure titanium TA2 thin plate double tungsten electrode argon arc welding process
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摘要: 针对1.24 mm厚纯钛TA2薄板进行双钨极氩弧焊堆焊，研究焊枪倾斜角度和电极间距对电弧耦合、焊缝成形的影响，利用高速摄影和电信号采集系统分别对电弧形态、电流和电压波形进行分析，揭示纯钛TA2薄板高速焊焊接缺陷形成和抑制机理. 结果表明，电极间距在11 ~ 15 mm，电弧干扰小，焊缝成形良好；两个焊枪呈大致对称倾斜分布，液态金属后向流动被抑制，无明显咬边现象，焊缝成形良好. 采用合理的工艺参数进行TA2薄板双钨极氩弧对接焊，焊接速度可达3 m/min，接头抗拉强度为434 MPa，断后伸长率为31.4%，拉伸试样断裂于母材.Abstract: In order to research the effect of welding gun tilt angle and the electrode inter-distance on coupling arc and weld formation for the tandem TIG welding of 1.24 mm thick titanium, this paper illustrated the mechanism of weld defect formation and inhibition, analysing the arc shape, current and voltage waveform by high-speed photography and electrical signal acquisition system.Experimental results showed that small arc interference and satisfactory bead formation were gained when the electrode inter-distance was between 11~15 mm. Beause of the back flow liquid metal suppressed, undercut was not found when the two guns distributed symmetrically. By using reasonable process parameters for the butt welding, the welding speed reached 3 m/min and the joint tensile sample fractured in the base metal with 434 MPa tensile strength and 31.4% elongation.
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