The bolt reducing die manufacturer tells you that the lack of hardness in cold stamping die welding is relatively common. Today, let's learn how to deal with the lack of hardness in cold stamping die welding:

Reason 1: The current is too large during welding, the dilution rate of the mold base material is too large, and the alloy elements of the mold base material are damaged.
Countermeasures: Bolt reducing die manufacturers tell you to use low current and short arc welding as much as possible, and the swing of the electrode during welding is not greater than 1.5 times the diameter of the electrode.
Reason 2: The preheating temperature and interpass temperature during welding are not controlled.
Countermeasures: Bolt reducing die manufacturers tell you to 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: Too many surfacing layers and improper selection of welding materials.
Countermeasures: Select welding materials suitable for the number of surfacing layers required. (The bolt reducing die manufacturer tells you that some welding materials have a high-hardness martensite structure directly, and some welding materials can be transformed from austenite to high-hardness martensite only when there are more than three layers of surfacing. organizational.