针对304 不锈钢薄板进行连续激光搭接焊工艺试验，研究工艺参数对焊缝成形及焊缝性能的影响规律。结果表明：随着激光功率增加，焊缝结合面宽度及背宽、接头拉伸剪切力均有所增加；随着焊接速度的增加，焊缝结合面宽度及背宽、接头拉伸剪切力均有所降低；而在保证焊缝成形的前提下，离焦量的变化对焊缝成形质量影响较小；叠层间隙在0.6 mm 以内时，均可实现单面焊双面成形；激光焊接焊缝中心区组织为细小的等轴晶，焊缝区和母材交界处为细小的柱状晶组织，热影响区不明显。

Continuous laser lap welding process test is conducted on 304 stainless steel sheet, and effects of process parameters on weld shape and weld properties are studied. The results show that surface width, back width and lap shear stress of the weld increase with the increasing of laser power and decrease with the increasing of welding speed. On the premise of good weld formation, change of defocusing distance has smaller influence on weld quality. One side welding with back formation is realized when the gap is within 0.6 mm. The microstructure is fine equiaxed crystal in weld center and small columnar crystal in the junction of weld metal and the parent material, and the heat affected zone is not obvious.