Abstract
DP780 dual-phase galvanized steels with 0.8mm thickness were lap welded by 4kw continuous fiber lasers to investigate the formation of porosity. By observing the welding parameters and recording the welding process with high speed cameras, the formation mechanism of internal porosity and external porosity was proposed. Based on the formation mechanism of porosity, we established the escape channel model of zinc vapor leaving the molten pool during the welding process, by controlling the dynamic balance of the pores of each channel to reduce the welding internal pores and external porosity defects, improve the welding quality.
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