This question just came up again the other day and we felt that we had better address it here, "Can tool steel be welded?"
Welding of tool steel is sometimes advantageous or necessary. Sometimes a tool cracks or chips while in service and needs to be welded. Occasionally a mold tool will need to have eroded material replaced by weld repair. A welded tool should not be considered as a standard solution but more as a temporary solution.
A welded repair will not have the same alloy content, hardness, toughness or wear resistance as the original base material. The performance of the tool will suffer to some extent. High carbon grades of tool steel are particularly difficult to weld with great results.
For the complete heat treating procedure, including tempering charts, tips and tool steel data sheets, see our "Tool Steel Simplified" book.
You can find all of the answers to your tool steel questions in our comprehensive book "Tool Steel Simplified". This concise book includes tool steel properties, alloying elements, uses, careers, data sheets, heat treating and so much more. It is written is an easy-to-understand format for designers, engineers, buyers, students, production planners and anyone that is interested in learning more about tool steel.
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