Cold stamping die welding hardness less than the phenomenon:
The reason :( a)
When the welding current is too large, the mold base material dilution ratio is too large, damage to the die base metal alloy elements.
Responses:
Try using a small current, short-arc welding, welding rod swing amplitude is not greater than 1.5 times the diameter of the electrode.
The reason :( two)
And the layer between the preheating temperature during welding temperature is not controlled.
Responses:
Pay attention to grasp preheat temperature (preheating temperature and carbon content of the base material is mainly concerned), and a control layer temperature during welding.
The reason :( three)
Surfacing layers excessive, improper selection of welding materials.
Responses:
Selection of welding materials for cladding layers required. (Some of the welding material of high hardness is directly organizer martensite, and some welding surfacing material is a three or more when it can be transformed from austenite to martensite of the high hardness.)
