Precision casting production tray, basket, stents and other heat treatment equipment, can appear sometimes casting defects such as surface crack, some tiny crack can repair by welding repair defects:Argon arc welding, precision casting, alloy steel, stainless steel casting, aluminum alloy die castings with argon arc welding machine for welding repair.Part of the mould manufacturing and repair factory, also USES the welding repair mold defect.1, advantages: welding repair of high efficiency, high precision of the electric welding machine.Wire sort is more, the most widely used on stainless steel, aluminum alloy products.Can be used for welding, high intensity of teaching.2. Disadvantages: used for defect repair, small defect fix (porosity, sand holes), because of the impact is too large, traces on the molten pool line.Weld steel has a hard point.Due to thermal effects, non-ferrous casting or thin-walled weld repairs, easy to produce thermal deformation.Operating higher technical requirements.