Mig Welding Troubleshooting - Weldclass WeldForce WF-200MST Operating Instructions Manual

by
MIG Welding
Troubleshooting
The general approach to fix 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.
WARNING!
Wire Jam Troubleshooting
• If wire jam occurs when the torch becomes hot, this is often because the heat causes the wire and the tip
to expand (which shrinks the hole in the tip). Using a slightly oversize tip can prevent this – eg: for 0.9mm
wire, use a 1.0mm tip.
• Do NOT over-tighten the drive roll tension – this will accelerate wear of the drive system, may distort the
wire & will cause further wire feed problems.
• Refer to page 15-16 for more troubleshooting tips.
16
When there is a gas problem the result is usually
porosity within the weld metal. Porosity always
stems from some contaminant within the molten
weld pool which is in the process of escaping
during solidification of the molten metal.
Contaminants range from no gas around the
welding arc to dirt on the workpiece surface.
Porosity can be reduced by checking the following
points.