激光与等离子电弧作为两种高能束热源进行复合焊接，相比于单独激光焊能够达到更大的熔深和更高的焊速，分别采用2 mm和4 mm厚度的304不锈钢板为母材进行平板焊和对接焊，观察焊缝成型与不同激光功率下的等离子体形态，研究在2 mm的平板高速焊中，在保证单面焊双面成型的前提下，不同激光功率的最佳电流匹配范围，及4 mm厚度不锈钢在对接焊中对于间隙与错边的适应性。试验表明，在保证单面焊双面成型与最低1 000 mm/min焊速的前提下，激光功率越大所匹配的电流范围越宽，越能达到更高的焊速。激光-等离子电弧复合焊在平板对接焊中，对于间隙与错边具有良好的适应性，最大适应间隙为0.5 mm，最大适应错边为1.5 mm。

Laser and plasma arc are used as two kinds of high energy beam heat sources for composite welding. Compared to laser welding alone, it can achieve greater penetration and higher welding speed. The 304 stainless steel plates with 2 mm and 4 mm thickness are used as the base metal for flat plate welding and butt welding respectively. The weld formation and the plasma shape under different laser powers are observed. Under the premise of ensuring double-sided formation for single-sided welding, the optimal current matching range of different laser powers and the adaptability of 4 mm thick stainless steel in the butt welding for gap and misalignment are studied in the 2 mm flat-plate high-speed welding . The tests show that under the premise of ensuring double-sided formation for single-sided welding and a minimum welding speed of 1 000 mm/min, the larger the laser power is, the wider the current range is matched, and the higher the welding speed can be achieved. Laser-plasma arc hybrid welding has good adaptability to gap and misalignment in flat-plate butt welding, the maximum adaptive gap is 0.5 mm and the maximum adaptive misalignment is 1.5 mm.