我厂生产的 YJ_4 油锯,体积小,重量轻,形状复杂,前半曲轴箱等零件是采用镁合金铸造。由于铸造及金加工等缺陷,报废量很大。目前采用氩弧焊工艺,广泛地在0.5～2.5毫米铸件壁上补孔,焊接成品率达到98%,使已报废的零件达到设计要求,为国家节约了大量财富,现将焊接方法介绍如下:1、焊接前需用砂纸或风动砂轮打磨焊 I produced YJ_4 chain saw, small size, light weight, complex shape, the first half of the crankcase and other parts are made of magnesium alloy casting. Due to defects such as casting and gold processing, scrap a great amount. At present, the use of argon arc welding process, widely in 0.5 ~ 2.5 mm casting wall make up the hole, the welding yield of 98%, so that scrapped parts meet the design requirements for the country to save a lot of wealth, welding methods are introduced as follows: 1, before welding sandpaper or wind with grinding wheel grinding