利用Nd:YAG脉冲激光作为焊接热源，对殷钢材料Invar36进行了对焊实验，分析了工艺参数(激光功率、焊接速度、脉冲宽度和离焦量)变化对焊缝的表面形貌、熔宽以及熔透性的影响。对2 mm厚度的殷钢对焊接头的硬度变化进行了检测，同时对比分析了焊缝和基体的金相组织。结果表明,激光功率和脉宽是影响焊缝熔深、熔宽和热影响区大小的主要因素，激光焊接速度的选择范围相对较小，离焦量主要影响焊缝的宽度和熔透性，焊缝的组织成分没有发生明显变化，显微硬度略低于基体，焊缝处的金相组织为奥氏体柱状晶,并且呈现奥氏体晶粒粗化现象。

Nd∶YAG laser beam butt-welding of invar36 alloy is carried out. The influence of the welding line′s surface, bead penetration and width to the laser parameter is investigated with plate-welding. The composition and hardness of the fusion zone is investigated with the butt-welding of the thickness of 2 mm. The result indicated that: laser power and pulse duration are the main factors which influence the weld bead penetration, weld width and heat affect zone (HAZ). There is a narrow selection range of the welding speed. The defocusing distance mainly affects the weld bead penetration and weld width. The composition of the welding-line has no obviously change, the hardness is appreciably lower than base body. The crystallographic orientation of the welding line had columnar crystals appeared and austenite growth.