The insulation of the nose has broken down and the weld current should be going through the wire, not the nose bushing. There are several possibilities, but the most common would be a worn EXPENDABLE nose sleeve (usually copper) that the wire exits through and should be conducting a large portion of the current to the wire. These pieces are expendable and are available at your welding supply house. The hole wears to the point that the wire doesn't contact it adequately.
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Thanks for the reply, I have a new tip in the shop, I will try that to see if there is any difference and respond shortly. doug
fredy2,
your suggestion worked. I put a new wire guide tip on, and it now welds as usual, with the nose resting on piece.
thank you.
doug
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