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林业机车曲拐销孔和大轴孔等磨损超限后,需要在孔的内壁堆焊厚约2～3毫米的金属层。由于工件较大,故工件只能平放。过去采用小电流在横焊位置沿内孔园周一圈圈地堆焊,每堆焊一个直径80～110、深120～130毫米的孔,要用2.5～3.5小时,而且堆焊层厚度不均匀,表面不光滑,甚至产生铁水下淌现象,因而质量不高,有时造成返
Forestry locomotive bell crank pin hole and large shaft hole wear beyond the limits, you need to weld the inner wall of the hole thickness of about 2 to 3 mm of metal layer. As the workpiece larger, so the workpiece can only be flat. In the past, a small electric current was used to build a circle around the inner hole in a horizontal welding position. For each surfacing, a hole with a diameter of 80 to 110 and a depth of 120 to 130 mm was used for 2.5 to 3.5 hours, and the thickness of the surfacing layer was not uniform , The surface is not smooth, and even lead to molten iron dripping phenomenon, so the quality is not high, sometimes caused by the return