附加补偿气体射流冲击熔池方法对不锈钢脉冲MIG高速焊的影响

Effect of Compensating Gas Jet Impinging Molten Pool on Pulsed MIG High Speed Welding of Stainless Steel

为提高不锈钢焊接速度并抑制驼峰焊道及咬边缺陷,文中提出人为干预焊后熔池运动的新思路,并通过引入补偿气体射流对高温未凝固熔池进行冲击,实现对不锈钢脉冲MIG焊(熔化极惰性气体保护焊)熔池进行人为干预而达到改善焊缝成形的目的.该方法利用自制的脉冲MIG焊接熔池补偿气体射流试验平台,以304不锈钢为焊接工件,进行等线能量输入条件下不同焊接速度和不同补偿气体射流流量试验.结果表明,补偿气体射流方法可使焊接速度提高2倍以上,焊缝平直、均匀、美观,无驼峰焊道和咬边缺陷;焊缝截面分析表明,该方法对驼峰部位堆积的液态金属调节率达78.63%,使焊接过程力热效率提升达74.36%.

A new idea of artificial interference in the movement of weld pool after welding was put forward to improve the welding speed of stainless steel and restrain the hump weld bead and undercut defects. Compensating gas jet was introduced to impact the high temperature unsettled weld pool, and the weld formation was improved by interfering pulsed MIG weld pool of stainless steel. A self-made pulsed MIG weld pool compensating gas jet test platform was used to test different welding speeds and different compensating gas jet flow rates with 304 stainless steel as welding workpiece under the same energy input. The results show that the welding speed can be increased by more than 2 times with the method of compensating gas jet, and the welding seam is straight, uniform and beautiful without hump and undercut defects. The cross-section analysis of welding seam shows that the adjustment rate of liquid metal accumulated in hump by this method reaches 78.63%, and the thermal efficiency of base metal increases to 74.36%.