因瓦合金TIG焊接温度场模拟分析

Simulation on temperature field for Invar alloy during TIG welding

根据因瓦合金和45钢TIG焊接特点,建立几何模型并确定双椭球热源模式,利用ANSYS软件模拟不同板厚焊接过程中温度场变化,实现温度场与应力场的弱耦合,模拟焊接温度场分布再现温度场的大小及分布情况;利用不同的焊接工艺参数和被焊材料厚度进行了焊接试验,测定焊接过程中特定位置的变形情况,对比分析数值模拟与试验结果。结果表明,在电流132 A,电弧电压17.1 V,焊接速度4 mm/s,板厚1.88 mm的焊接工艺参数条件下可以实现因瓦合金的熔透性焊接,获得良好的焊接接头;利用有限元数值分析方法模拟了焊接工艺参数条件下的焊件温度场分布和熔透性,模拟结果与试验结果一致。

According to TIG welding character of Invar alloy and 45 carbon steel,geometric model was founded and double ellipsoid heat source model was selected as welding heat source.Temperature fields of base materials with different thickness were simulated using ANSYS,and coupled field of temperature and stress was realized to simulate the residual stress distribution.Experiments under different thickness and welding parameters were carried out and distortion of base materials with different position was detected....