The effect of laser power on metal transfer is studied under conditions of alternating combustion of double arcs in order to develop the welding process of the laser-double arcs pulsed metal active gas （P-MAG） hybri...The effect of laser power on metal transfer is studied under conditions of alternating combustion of double arcs in order to develop the welding process of the laser-double arcs pulsed metal active gas （P-MAG） hybrid welding with single power. Different laser power corresponds to different interactive mechanisms of laser and arc and to different methods of metal transfer in the hybrid welding. When the laser power ascends from 500 W to 1 500 W, the methods of metal transfer change from the complex transfer of one droplet per pulse, one droplet two pulses and one droplet much more pulses during the mixture of globular and projected transfer of the lead wire, and from one droplet two pulses and one droplet three pulses during globular transfer of the follow wire to the methods of the metal transfer of both lead wire and follow wire are stable one droplet two pulses and one droplet three pulses when the metal transfer is mainly globular. The arc sharps and pressure of droplet are altered with the laser power changing. The compression of the arcs is strengthened by the laser and the offset of the center of droplet mass is much more obvious with the increasing of the laser power.展开更多
搭建了铝合金激光-冷金属过渡(Cold Metal Transfer,CMT)复合焊接试验平台和高速摄像采集平台,研究铝合金激光-CMT焊接过程中的熔滴特性.改变激光功率,获得不同焊接参数下CMT熔滴过渡的高速摄像图.通过对比分析可知,在激光功率较小时,...搭建了铝合金激光-冷金属过渡(Cold Metal Transfer,CMT)复合焊接试验平台和高速摄像采集平台,研究铝合金激光-CMT焊接过程中的熔滴特性.改变激光功率,获得不同焊接参数下CMT熔滴过渡的高速摄像图.通过对比分析可知,在激光功率较小时,激光主要起到引导电弧作用,对CMT电弧影响较小,焊接过程较为稳定,能够获得良好焊缝成形.当激光功率较大时,会影响CMT原有的短路过渡,造成熔滴飞溅等情况,导致焊缝成形较差.结果表明:保持焊丝和激光间距的有效距离和控制激光功率,是保证激光-CMT复合焊接过程稳定的关键.展开更多
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...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.展开更多
基金This paper is supported by National Natural Science Foundation of China （Grant No. 51175374） , the Application of Basic ＆ Frontier Technology Program of Tianjin （Grant No. OgJCYBJC05000） and the Science ＆ Technology Pillar Program of Tianjin （Grant No. 10ZCKFSF00200）.
文摘The effect of laser power on metal transfer is studied under conditions of alternating combustion of double arcs in order to develop the welding process of the laser-double arcs pulsed metal active gas （P-MAG） hybrid welding with single power. Different laser power corresponds to different interactive mechanisms of laser and arc and to different methods of metal transfer in the hybrid welding. When the laser power ascends from 500 W to 1 500 W, the methods of metal transfer change from the complex transfer of one droplet per pulse, one droplet two pulses and one droplet much more pulses during the mixture of globular and projected transfer of the lead wire, and from one droplet two pulses and one droplet three pulses during globular transfer of the follow wire to the methods of the metal transfer of both lead wire and follow wire are stable one droplet two pulses and one droplet three pulses when the metal transfer is mainly globular. The arc sharps and pressure of droplet are altered with the laser power changing. The compression of the arcs is strengthened by the laser and the offset of the center of droplet mass is much more obvious with the increasing of the laser power.
文摘搭建了铝合金激光-冷金属过渡(Cold Metal Transfer,CMT)复合焊接试验平台和高速摄像采集平台,研究铝合金激光-CMT焊接过程中的熔滴特性.改变激光功率,获得不同焊接参数下CMT熔滴过渡的高速摄像图.通过对比分析可知,在激光功率较小时,激光主要起到引导电弧作用,对CMT电弧影响较小,焊接过程较为稳定,能够获得良好焊缝成形.当激光功率较大时,会影响CMT原有的短路过渡,造成熔滴飞溅等情况,导致焊缝成形较差.结果表明:保持焊丝和激光间距的有效距离和控制激光功率,是保证激光-CMT复合焊接过程稳定的关键.
文摘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.
