In the production process of castings, due to various factors, defects such as pores, pinholes, slag inclusions, cracks, and pits often appear. At this time, in order to make the castings meet the standard of use and reduce the loss and waste, the defects are often repaired.

Commonly used repair equipment is argon arc welding machine, resistance welding machine, cold welding machine, etc. Casting defects that do not require high quality and appearance can be repaired by welding machines with high heat generation and high speed such as argon arc welding machines. However, in the field of precision casting defect repair, due to the large influence of argon welding heat, the repair will cause casting deformation, hardness reduction, blisters, local annealing, cracking, pinholes, wear, scratches, undercuts, or insufficient bonding force. and secondary defects such as internal stress damage. The cold welding machine just overcomes the above shortcomings. Its advantages are mainly reflected in the small heat affected area, the casting does not need to be preheated, and the cold welding repair at room temperature, so there is no deformation, undercut and residual stress, no local annealing, and no change to the casting. state of the metal structure.

Therefore, the cold welding machine is suitable for surface defect repair of precision castings. The repair range of cold welding is the process of repeated melting and accumulation of welding repair points of Φ1.5-Φ1.2mm. In the process of repairing large-area defects, repair efficiency is the only factor that restricts its widespread application. For large defects, the combined application of traditional welding repair process and casting defect repair machine is recommended.