利用DC025扩散冷却板条(SLAB)激光器系统地研究了激光焊接三明治金刚石锯片的焊接缺陷和焊接工艺。结果表明焊接缺陷主要表现为焊缝中大量的气孔和较多的铜，降低了焊缝强度。气孔来源于基体里黏接剂、油污与粉末冶金刀头的共同作用，采用正面熔透1/2，反面完全熔透的焊接方式和提高焊接速度来减少气孔缺陷。铜来源于基体里铜板的熔化，当激光偏向刀头时，铜的含量降低。350 mm三明治锯片合适的焊接参数为激光偏移量0～+0.20 mm，正面焊接线能量为25～40 J/mm，且激光功率低于1000 W；反面焊接线能量为80～150 J/mm，且激光功率高于1500 W；此时焊缝铜的质量分数为0.2%～1.1%，焊接气孔较少，焊缝抗弯强度满足EN13236安全标准。

Laser welding technology and defect of sandwich diamond saw are systemically researched with RofinDC025 laser. The result indicates that a mass of porosities and more Cu are the main welded defect in the welding. The porosities produced by the action together of impurities in the interlayer and powder metallurgy material can be reduced mostly when welding depth is body′s 1/2 in one side and body′s 100% in another side or improving the welding speed. The Cu that produced by the melting Cu plate in the body can be reduced when the lasering lean to the diamond segment. The right welding parameters of 350 mm sandwich saw are that the laser offset is 0～+0.20 mm, in one side the welding line energy is 25～40 J/mm with the laser power under 1000 W, in another side the welding line energy is 80～150 J/mm with the laser power excess 1500 W. Under this optimization condition, the content of Cu is about 0.2%～1.1% in the welded zone, the porosities are less, and the welded blend intensity is up to EN13236 safety standard.