激光-电弧复合焊接高强钢的性能

Performances of laser-arc hybrid welded high strength steel

为了研究焊接参数对激光-电弧复合焊接性能的影响,采用了2 k W光纤激光器和MAG(熔化极活性气体保护焊)复合焊接780 MPa高强钢板,通过高速摄像机观察了熔滴过渡形式及激光(或电弧)先导的等离子体形态,研究了激光(或电弧)先导的特性、激光与电弧间距离、离焦量、MAG电流和熔滴过渡形式对激光-电弧复合焊接性能的影响.结果表明,电弧先导的焊缝成形更好;等离子体不仅影响焊缝形状,而且影响激光-电弧间最佳距离;激光与电弧间距对熔宽的影响较小;焊接电流影响焊缝形状和熔深,随着焊接电流的增加,熔深增加,当离焦量为-2 mm时熔深最大.

In order to investigate the effect of welding parameter on the performances of laser-arc hybrid welding,a 2 k W fiber laser and metal active-gas welding( M AG) were used to weld 780 M Pa high strength steel plate. The mode of metal transfer and morphology of plasma obtained by laser leading or arc leading were observed with a high-speed camera. The effect of characteristics of laser leading or arc leading,laser-arc distance,defocusing distance,M AG current and mode of metal transfer on the performances of laser-arc hybrid welding was investigated. The results showthat a better weld bead formation is gained by the arc-leading. The plasma not only affects the weld bead shape,but also influences the optimum laser-arc distance. The laser-arc distance has no significant effect on the bead width,while the welding current will affect the bead shape and penetration. With increasing the welding current,the penetration increases. The maximum penetration is obtained when the defocusing distance is- 2 mm.