2016 年 34 巻 1 号 p. 50-56
In order to realize both of low spattering and low heat input, controlled GMA short-circuiting transfer processes have been developed and practically used in various fabricating sites: Controlled Bridge Transfer (CBT) method by current waveform control, Cold Metal Transfer (CMT) method by wire feeding control, etc. Actually higher performance of GMA welding processes have been provided by deeply understanding mechanism of short-circuiting transfer process. So, we developed three-dimensional numerical model of GMA short-circuiting transfer process including control of welding current and wire feeding speed.
It is shown that welding current control method can effectively adjust electromagnetic force for breakup time of liquid bridge in increasing deposition rate and wire feeding control method can effectively improve regularity of short-circuiting transfer process. Both advantages of increase in deposition rate and improvement in regularity of short-circuiting transfer process are provided by hybrid control method combining two control methods.