Weldtronic TM250C Operating Manual page 33

Possible causes
Wire feed speed too high.
Voltage too high.
Electrode extension too long.
Work piece dirty.
Insufficient shielding gas at arc.
Dirty welding wire.
Possible causes
Wrong gas.
Welding wire extends too far out of
nozzle.
Work piece dirty.
Insufficient shielding gas at arc.
Dirty welding wire.
Excessive spatter
Scattering of molten metal particles that cool to solid near
weld bead.
Select lower wire feed speed.
Select lower voltage.
Use shorter electrode extension.
Remove all grease, oil, moisture, rust, paint, undercoating, and
dirt from work surface before welding.
Increase flow of shielding gas at regulator and/or prevent
drafts near welding arc.
Use clean, dry welding wire.
Eliminate pickup of oil or lubricant on welding wire from
feeder or liner.
Porosity
Small cavities or holes resulting from gas pockets in weld
material.
Use welding grade shielding gas; change to different gas.
Be sure welding wire extends no more than ½ in beyond
nozzle.
Remove all grease, oil, moisture, rust, paint, undercoating, and
dirt from work surface before welding.
Use a highly deoxidising welding wire (contact supplier).
Increase flow of shielding gas at regulator and/or prevent
drafts near welding arc.
Remove spatter from gun nozzle.
Check gas hoses for leaks.
Place nozzle ¼ to ½ in from work piece.
Hold gun near bead at end of weld until molten metal
solidifies.
Use clean, dry welding wire.
Eliminate pickup of oil or lubricant on welding wire from
Corrective actions
Corrective actions
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