论文部分内容阅读
采用CO_2激光器和MAG焊机在5mm厚高强度钢板上进行了复合焊接试验,同时,采用高速摄像机对等离子体形态、复合焊接稳定性以及熔滴过渡行为进行了研究。结果表明,保护气体参数对焊接过程的稳定性、熔滴过渡行为和焊缝形状的影响至关重要。伴随着气体流量的增加(由15L/min增加到35L/min),焊接过程由稳定变得不稳定,焊接熔深先增大后减小,等离子体高度、熔滴过渡频率和熔滴分离速度呈减小的趋势,熔滴直径呈增大的趋势。此外,He含量增加到一定值时会导致引弧不稳定,造成焊缝表面产生缺陷。
The CO 2 laser and MAG welder were used to perform composite welding on 5mm thick high strength steel plate. At the same time, the plasma morphology, composite welding stability and droplet transfer behavior were studied by high speed camera. The results show that the influence of shielding gas parameters on the stability of the welding process, the droplet transfer behavior and the shape of the weld is of crucial importance. With the increase of gas flow rate (from 15L / min to 35L / min), the welding process becomes unstable from instability, and the welding penetration first increases and then decreases. The plasma height, droplet transfer frequency and droplet separation speed With the decreasing trend, the droplet diameter showed an increasing tendency. In addition, He content increases to a certain value will lead to unstable arc, resulting in weld surface defects.