基于半径修正的熔化极气体保护焊熔滴模型

摘要

Experiments prove that the droplet radius decreases with the increase of the welding current. Static equilibrium theory and dynamic balance theory were used to describe the droplet transfer. The simulation results of droplet radius are close to experiment data in low current. However, there is great error between the simulation results and experiment data at high welding current. The electromagnetic force was revised based on the dynamic equilibrium theory and the radius of the solid - liquid two - phase contact decreased as the welding current being increased in high current interval. The simulation results of dynamic model with amendments are close to the experiment data. The study makes it possible to apply dynamic equilibrium theory for droplet estimation of welding arc at high current.%熔化极气体保护焊(GMAW)时,熔滴半径会随焊接电流的增大而减小.文中在动态平衡理论基础上,对电磁力做了改进；对固-液两相接触面半径进行修正,其在大电流区间随着电流增大不断减小.引入修正后模拟结果表明,模拟数据在大电流区间与试验数据接近,完善了动态平衡理论在大电流区间的模型.