Effect of Welding Parameters on Stainless Steel Lap Weld Formation
According to the welding characteristics and requirements of corrugated plate of main screen wall of MARKⅢ LNG membrane tank,a large number of plasma arc welding process tests were carried out by changing main welding process parameters at vertical upward position,and the influence of process parameters on 304L stainless steel lap weld formation was studied.The results show that the arc parameters such as arc peak current,pulse frequency and ionic gas flow,as well as arc length and torch pointing position have a significant impact on the weld formation.The range of process parameters for good weld formation is the peak current of 70-95 A,the base current of 30 A,the pulse frequency of 4-6 Hz,the ion gas flow rate of 0.20-0.35 L/min,the arc length of 0.8-1.4 mm,and the welding torch pointing position of-0.3-0.3 mm.The experimental results provide a theoretical basis for the development of automatic welding equipment.
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