WELDTECH WT200MP - MIG Welding Troubleshooting; Troubleshooting Porosity Issues; Troubleshooting Wire Feed Problems

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MIG Welding
Troubleshooting
ThegeneralapproachtoxGasMetalArcWelding
(GMAW)problemsistostartatthewirespoolthen
workthroughtotheMIGtorch.Therearetwomain
areas where problems occur with GMAW, Porosity
and Inconsistent wire feed.
When there is a gas problem the result is usually po-
rosity within the weld metal. Porosity always stems
from some contaminant within the molten weld
pool which is in the process of escaping during so-
lidication of the molten metal.
Contaminants range from no gas around the weld-
ing arc to dirt on the workpiece surface. Porosity can
be reduced by checking the following points.
WARNING!
Disengage the feed roll when testing for gas ow by ear.
Wire feeding problems can be reduced by checking the following points.