激光与电弧相互作用时的电弧形态及焊缝特征

激光与电弧的复合热源在焊接过程中，由于激光的压缩与引导作用，可以在焊接速度增加时，电弧仍然较稳定。在去掉激光同轴保护气流而只采用TIG的保护气体进行保护时，由于激光同轴气体的冲击、压缩和冷却作用的消失，等离子气体将会随着电流、激光功率的增加而增大，因而引起焊缝横截面的变化。通过调整激光与电弧的规范参数，并用CCD摄取各参数下的电弧图像以分析等离子体的长大情况，然后将得到的焊缝沿横截面剖开。通过对各种参数下等离子体图像和焊缝横截面之间的相互的关系进行分析，得到与常规情况下相比熔宽较宽而熔深较浅的焊缝的焊接参数。这种产生涂敷型焊缝的参数可用于高速表层涂覆。

Properties of arc and weld in laser-TIG hybrid process

During the laser-TIG hybrid process,the arc keeps stable when the welding speed increases because of the inducting and compression of laser on the TIG arc.After the removing of the coaxial shielding gas of laser,the plasma will grow with the increase of current and laser power due to the disappearance of effect of the shielding gas on laser,as a result,the section of bead is changed.By adjusting the parameters of laser and TIG the statuses of the growing plasma shot by CCD and the bead section were investigated.Through analyzing the relationship of the plasma images and the bead section,the parameters that can produce bead of wilder width and shallower penetration are acquired.These parameters can be used in superficial coating of high speed.