Casting defect repair technology

Due to various factors, castings often have defects such as pores, pinholes, inclusions, cracks, and pits. The commonly used repair equipment is argon arc welding machine, resistance welding machine, cold welding machine and so on.

Casting defects that do not require high quality and appearance can be repaired with an argon-arc welding machine and other heat-generating, high-speed welders. However, in the field of precision casting defect repair, due to the great influence of argon welding heat, the casting will deform, reduce the hardness, blisters, localized annealing, cracking, pinholes, wear, scratches, undercuts, or insufficient bonding force. Secondary defects such as stress damage.

The cold welding machine just overcomes the above shortcomings. Its advantages are mainly reflected in the small heat-affected zone, no need for preheating of castings, cold-welding at room temperature, no deformation, no undercut and residual stress, no local annealing, no change in the metal of castings. Organization status. The cold welding machine is therefore suitable for the surface defect repair of precision castings. The welding repair range of cold welding is the process of repeated melting and accumulation of Φ1.5-Φ1.2mm welding points. In the process of large-area defect repair, the repair efficiency is the only factor that restricts its widespread application. For large defects, it is recommended to combine the traditional welding repair process with the casting defect repair machine.