Insufficient hardness of cold stamping die welding:
Reason: (1)
When the welding current is too large, the dilution ratio of the mold base material is too large, and the alloying elements of the mold base material are damaged.
Countermeasures :
Try to use small current and short arc welding. The amplitude of the welding rod when welding is not more than 1.5 times the diameter of the welding rod.
Reason: (2)
The preheating temperature and the interlayer temperature during welding are not controlled.
Countermeasures :
Pay attention to the preheating temperature (the preheating temperature is mainly related to the carbon content of the base metal) and the control of the interlayer temperature during welding.
Reason: (3)
Excessive number of surfacing layers and improper selection of welding materials.
Countermeasures :
Select the welding material that is suitable for the number of layers to be welded. (Some welding material structures are directly high-hardness martensite structure, and some welding materials can be transformed from austenitic structure to high-hardness martensite structure when surfacing is more than three layers.)
Defects and Countermeasures of Cold Stamping Die Welding
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