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I have a pro-mig 135 and while welding the arc surges up and down along with the wire feed.the feed is real jumpy and will not keep a constant smooth puddle

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You need to clean and perhaps replace the liner in your wire feed gun. The liner gets tiny bits of dirt and **** up inside. After even normal use for a while, the liner itself gets worn away and makes the wire stick rather than smoothly poke into the puddle.

Liner maintenance time is also a good time to check the feed wheels for wear, look for the little ruts in the wheel to be dull or obviously worn at the edges. Wipe off the drive shafts and housing as long as you've got the drive wheels off anyway. :-)
All of this should have a nicely illustrated procedure in your user manual.

The other thing that can cause problems is that the welding wire can sometimes get rusty enough to be sticky inside the liner. Roll off a good length of wire (2 or 3 wraps around the spool) and inspect it for any sort of funkyness. If in doubt, blow out the liner, change the wire, and weld something to see if it works better.


Posted on Jan 26, 2009


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