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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。φ50 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。
The defects and welding process of laser welded sandwich diamond saw blade were systematically studied by using DC025 diffusion cooling slab (SLAB) laser. The results show that the welding defects are mainly manifested as a large number of pores and more copper in the weld, reducing the weld strength. Stomata from the matrix adhesive, oil and powder metallurgy joint action, the use of positive penetration 1/2, the reverse is completely through the welding method and improve the welding speed to reduce porosity defects. Copper comes from the melting of the copper plate in the substrate, and as the laser deflects toward the tip, the copper content is reduced. The suitable welding parameters for the φ50 mm sandwich saw blade are laser offset 0 ~ + 0.20 mm, front welding line energy 25 ~ 40 J / mm and laser power less than 1000 W; reverse welding line energy 80 ~ 150 J / mm, and the laser power is higher than 1500 W; at this time, the mass fraction of the weld copper is 0.2% -1.1%, the welding porosity is small and the flexural strength of the weld meets the safety standard of EN13236.