(一)联合采用氧乙炔气焊和电弧焊补焊铸铁件我厂生产的100吨曲柄压力机机身,材料为HT21—40,重约5000公斤,其传动轴孔出现铸造时的“掉砂”缺陷。缺陷在机身内腔,大侧板略中部的位置。由于该部位的端面及内孔均需进行机械加工,而且要求补焊的材料和母材色泽相近。要达到上述要求,最合适的方法是采用氧乙炔铸铁焊条补 (A) the joint use of oxyacetylene gas welding and arc welding welding cast iron parts I produced 100 tons of crank press machine fuselage, material HT21-40, weighing about 5000 kg, the drive shaft hole casting found “out of sand” defect. Defects in the fuselage cavity, a little side of the large side plate position. Because of the parts of the end and bore are required for machining, and require repair welding materials and base material similar color. To achieve the above requirements, the most suitable method is to use oxygen acetylene cast iron electrode make up