I'd polish it and then draw to a bright blue; which should remove any "strain" left from the welding.
Depending on how he welds it, it may not show but 1/4" of "heating" on either side of the weld.
Please post a picture when it is returned before you do anything to it.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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