Insufficient hardness of cold stamping die welding: Rea […]
Insufficient hardness of cold stamping die welding:
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.
Countermeasure: 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.
The preheating temperature and the interlayer temperature during welding are not controlled.
Countermeasure: 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.
Excessive number of surfacing layers and improper selection of welding materials.
Countermeasure: Select the welding material that is suitable for the number of surfacing layers. (Some welding material structures are directly high-hardness martensite structure, and some welding materials can be transformed from austenite structure to high-hardness martensite structure when three or more layers are welded.