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I Forge Iron

Mig Welding Medium or high carbon steel ???

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I will forge  several nail headers from medium or or higher carbon. However, I want to MIG WELD the header to a low-carbon steel handle. How much carbon content must there be to concern myself with preheating the carbon prior to welding to low carbon (1018) steel?? or perhaps just pre-heat it anyway to be safe?

When it JUST begins to turn a dark red would probably be hot enough?

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