【摘要】 为改善紫铜厚板的焊接性,采用商业有限元软件Marc对钨极气体保护焊接紫铜厚板的温度场进行模拟,并详细讨论了焊接电流以及预热温度对熔池和热影响区的影响.结果表明,熔池和热影响区均随着预热温度和焊接电流的增加而增加,因此,在采用不同的预热温度和焊接电流的组合可以得到相同尺寸的熔池,但热影响区尺寸差别很大;在20℃时采用He或N2气保护焊得到的熔池尺寸与Ar气保护预热400℃时得到的熔池尺寸基本一致,但热影响区的尺寸窄于Ar气保护预热400℃时得到的热影响区尺寸.更多还原

【Abstract】 To improve the weldability of thick copper plates,the welding temperature patterns of gas tungsten arc welding for thick copper plates were simulated by the commercial finite element software Marc,and the effects of different welding currents and different preheating temperatures on the size of weld pools and heat-affected zones were discussed. Results show that both the weld pools and the heat-affected zones increase with the increasing preheating temperatures or welding currents. Weld pools with the same size can be obtained by combining different welding currents and preheating temperatures,while the sizes of their heat-affected zones are different very much. The sizes of weld pools obtained by He or N2 arc welding at 20 ℃ come up to those obtained by Ar arc welding at the preheating temperature of 400 ℃,and the heat-affected zones are narrower than those obtained by Ar arc welding at the preheating temperature of 400 ℃.更多还原