By contrast, when CaF_2 is used as the activator, the depth of fusion increases by 2.5 times, the surface build-up welding for 6 mm plate in thickness can be welded fully.

• 其中涂敷SiO2；TiO2；Cr2O3 表面活性剂对15MnVR钢的焊接熔深增加不明显；而涂敷 CaF2 表面活性剂时焊接熔深可增加 2.；5倍；表面堆焊可焊透厚度为6 mm的钢板