Research and experiment on double pulsed MIG aluminum welding process parameters design
Pores occur easily in the aluminum welding,but it scares appears in the double pulsed MIG welding process in which approving and qualified welding seam turn up.The most typical characteristic of the double pulsed MIC is the one pulse one droplet transfer mode is made when the frequency is high while the molten pool is controlled when the frequency is low,that is,one molten pool and the scales are made during one low frequency cycle.Due to the stirring in each low frequency cycle,the gas in the molten pool is excluded and pores are less likely happening.Many parameters need to be set up in the double pulsed MIG welding,including the peak and base current and its lasting time of strong pulse as well as weak pulse.4 groups of double pulsed MIG welding including 12 experiments are set to find the relationship between welding conditions and parameters in the welding seam formation,no undercut with good penetration and section shape.It is proved the welding power in this experiment has good performance and can do double pulsed MIC aluminum welding well.
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