摘要
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。
In this paper, the plasma conformation, stability of hybrid welding process and behavior of droplet transfer have been studied by high speed video photography during CO2 laser- metal active gas （MAG） hybrid welding of high strength steel plates of 5mm thickness. The results indicate that the shielding gas is very critical to the stability of process, droplet transfer mode and bead profile. When the gas flow rate is increased（from 15L/min to 35L/min）, the hybrid welding process is changed from stability to instability. The welding penetration first increases, then decreases. The plasma height, frequency of droplet transfer and separation velocity of droplet decrease, while the droplet diameter increase significantly. In addition, He contents increases to a certain value leading to striking arc unstable and defects of weld surface.
出处
《应用激光》
CSCD
北大核心
2010年第6期503-507,共5页
Applied Laser
关键词
复合焊接
焊接熔深
熔滴过渡
等离子体
hybrid welding
welding penetration
droplet transfer
plasma
