钛管高速双枪TIG焊电弧和熔池动态行为的数值模拟

Numerical analysis of arc and molten pool behaviors in high speed tandem TIG welding of titanium tubes

采用高速双枪TIG焊制造钛焊管。建立双钨极、双电弧和熔池耦合数学模型,研究温度场分布、电弧等离子体和熔池液态金属流动以及双枪TIG焊系统能量传输行为。电弧极性相同,在电磁力作用下,前后电极下方的电弧等离子体相向流动。熔池Marangoni力远高于电弧剪切力,是熔池上表面液态金属后向流动的主要驱动力。计算的双钨极电弧热效率为79.8%。高速双枪TIG焊可以提高钛焊管的制造效率和质量。

A high speed tandem TIG welding process was adopted to manufacture titanium welded tubes.A coupled electrode,arc and weld pool numerical model was also developed to investigate the temperature distribution,arc plasma and molten metal flows,and energy propagation of this welding process.Under the driving of the electromagnetic force,arc plasmas under the leading and trailing electrodes flowed towards each other.The Marangoni stress was much higher than the arc shear stress,and was the main driving force for the backward molten metal flow on the top weld pool surface.The calculated arc efficiency of this welding process was 79.8%.The high speed tandem TIG welding process can improve the manufacturing efficiency and quality of titanium welded tubes.