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:SMT machineOn the principle of instantaneous high frequency discharge welding sheet (0. 05-0. 20 mm) affixed to the surface, the maximum equivalent and each paste thickness slice thickness, welding welding quality depends on whether discharge uniformity.Wear and tear, is suitable for workpiece machining super bad repair, in the mold market has a certain influence.The machine can also be solder powder (or processing of waste cutting), fill to the defects such as sand holes, repair after discharge.After repair of the workpiece color difference is small.Defect is repaired slower.