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I Forge Iron

Forge welding: Scarfing.


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I guess the first principle is to get enough mass in place, so that when the pressure is applied, the finished product is thick enough, upsetting is the first part. Then creating matching surfaces to align, and then get to stick is the other part.

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The upset is to put material into the area either side of the weld area to allow for wastage and for thinning while blending in the toe of the scarf.

The important things for me are
1. Slope to the end of the scarf or you will be left with cracks post welding
2. Thin the toe (end) of the scarf so that it is smaller than the bar too which it will be welded (anvil effect)
3. Weld only when the bars are wet
4. Bars won't weld when 'crusty'
5. Support the bars on the side of the anvil when bringing them together

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