Casting defect how to repair?

Castings due to a variety of factors, often can appear porosity, pore, slag inclusion, cracks and potholes in defects. Commonly used to repair the equipment for argon arc welding machine, cold resistance welding machine, welding machine, etc. Low requirements for the quality and appearance of the casting defects can use argon arc welding machine and other large calorific value, high speed welding machine to repair. But in the field of precision casting defect repair, because of the influence of argon welding heat, caused to repair the casting deformation and hardness decrease, sand holes, partial annealing, cracking, pinhole, wear, scratch, bite, or the binding force is not enough and secondary defects such as internal stress injury. Cold welding machine is to overcome the above shortcomings, its advantage mainly displays in the heat affected zone is small, the casting without preheating, normal temperature cold welding repair, therefore no deformation, bite edge and residual stress, won't produce local annealing, don't change the casting metal tissue state. So cold welding machine is suitable for precision castings surface defect repair.