低功率YAG激光-MAG电弧复合焊接不锈钢

以0Cr18Ni9Ti不锈钢钢板为试验材料,研究了低功率脉冲YAG激光-脉冲MAG电弧复合热源和单脉冲MAG焊接不锈钢.结果表明,低功率脉冲YAG激光-脉冲MAG电弧复合热源同样具有大功率激光-电弧复合焊接才有的增加熔深、提高焊接速度、稳定焊接过程等优点;低功率脉冲YAG激光的加入改变了电弧形态,电弧根部被吸引和压缩现象显著,提高了能量利用率;与单脉冲MAG堆焊相比,在相同焊接速度下复合焊最大能增加熔深1.3倍,在相同熔深下复合焊的焊接速度可以提高50%;复合焊焊缝的晶粒较单MAG焊缝中的晶粒细小,其焊缝抗拉强度比单MAG的好,断裂属于延性断裂.

Low-power YAG laser-MAG arc hybrid welding of stainless steel

This paper studied the low-power pulsed YAG laser-pulsed MAG arc hybrid welding of stainless steel based on the comparison between hybrid welding process and single pulsed MAG (metal active-gas)arc welding.Compared with high-power laser-arc hybrid welding, the low-power pulsed YAG laser-pulsed MAG arc hybrid welding also had many same merits such as increasing penetration depth, improving welding speed and stabilization of welding process.The shape of the arcwas changed in low-power pulsed YAG laser hybrid welding due to the input of low-power pulsed YAG laser.When the pulsed YAG laser acted on arc region, the attraction and contraction of the arc root in low-power pulsed YAG laser-pulsed MAG arc hybrid welding was prominent, and the energy absorption of MAG arc and pulsed YAG laser increased.The penetration depth in low-power pulsed YAG laser-pulsed MAG arc hybrid welding was 1.3 times of that in MAG welding when welding speed was same, and the welding speed increased 50 percent when the penetration depth was equal to that of MAG welding.The crystal grain of hybrid welding was smaller than that of weld for MAG welding, and the strength of hybrid welded joint was higher than that of MAG welded joint, and hybrid welded joint rupture was ductile rupture.