CO_2气体保护焊短路过渡过程液相金属桥稳定性分析  

Analysis of Stability of Liquid Metal Bridge during Short Circuit Metal Transfer in CO 2 Gas Shielded Welding

作　　者：里强 杨世彦[1,2] 王其隆[1,2] 

机构地区：[1]北京中国重型机械总公司 [2]哈尔滨工业大学

出　　处：《焊接学报》1998年第S1期110-115,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金

摘　　要：理想短路过渡过程的本质应当是熔化的焊丝金属与液态熔池接触后，液相金属桥在多种能量作用下建立、发展以及随后失稳破断的过程。本文基于所提出的短路过渡液相桥系统的能量模型，采用三维有限元方法分析其平衡液面形态，对短路过渡行为进行了研究。结果表明，短路后通过回抽焊丝的方法向液相桥施加一定的机械能，可以显著降低短路过渡对电磁能量的要求，实现液相桥的失稳破断，从而获得极少飞溅的平稳短路过渡过程。为采用回抽焊丝平稳拉断液相桥的控制方法奠定了理论基础。The nature of an ideal short-circuiting transfer should be essentially an energy determined integrated process consisted of the liquid metal bridge establishing, extension and subsequent instability rupture after metal droplet contacting with molten pool. According to the energy model in the paper, the behavior of liquid metal bridge in short circuiting transfer was studied by analyzing its menisci with three dimension Finite Element Method. It shows that electromagnetic energy requirement of metal transfer can be remarkably decreased by the additional mechanical energy from real-time drawing wire back after short-circuiting. Moreover, a low spatter lose can thus be obtained due to the smooth instability rupture of liquid metal bridge. It creats the theorical foundation of the control process of smooth liquid metal bridge rapure by wire drawing control.

关 键 词：短路过渡 CO₂焊接 液相桥 表面张力 

分 类 号：TG444.73[金属学及工艺—焊接] TG444.73