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How to fix the defects of cast copper parts?

Update:26 Oct 2019
Summary:

Cast copper process: alkaline chemical degreasing → hot […]

Cast copper process: alkaline chemical degreasing → hot water washing → water washing → dip 25% hydrofluoric acid → water washing → mixed acid corrosion → water washing → immersion 5% lye → water washing → pre-plating copper → water Washing → silver plating → water washing → passivation → water washing → removing film → water washing → dip lighting → water washing → hot water washing → drying → inspection.

Due to a variety of factors, cast copper parts often have defects such as pores, pinholes, slag inclusions, cracks, and pits. Commonly used repairing equipment are argon arc welding machines, resistance welding machines, cold welding machines, and the like. For casting defects that are not required for quality and appearance, it can be repaired with a welding machine such as a argon arc welding machine that generates a large amount of heat and a high speed. However, in the field of precision casting copper defect repair, due to the great influence of argon welding heat, the deformation of the casting, the hardness reduction, the blisters, the local annealing, the cracking, the pinhole, the abrasion, the scratch, the undercut, or the bonding force are insufficient. And secondary defects such as internal stress damage. The cold welder just overcomes the above shortcomings, and its advantages are mainly manifested in the small heat affected zone, the castings do not need to be preheated, and the normal temperature cold welding repairs, so there is no deformation, undercut and residual stress, no local annealing, no change of the metal of the casting. Organizational status. Therefore, the cold welder is suitable for surface defect repair of precision cast copper parts.