Lincoln Electric LTW1 - Manual (Page 12)

11 LEARNING TO WELD 11
TROUBLESHOOTING WELDS
Good welds have excellent appearance.
To Eliminate Porosity
(In order of priority):
1. Check for proper gas flow and reset WFS & Volts
on chart inside door.
2. Clean joints from moisture, paint, rust etc.
3. Decrease CTWD with GMAW.
4. Decrease drag angle.
5. Decrease travel speed.
NOTE: Always be sure the joint is free from moisture,
oil, rust, paint or other contaminant
’ s.
To Eliminate a Ropy Convex Bead
(In order of priority):
1. Check or reset WFS & Volts on chart inside door.
2. Decrease CTWD.
3. Decrease travel speed.
4. Decrease drag angle.
To Reduce Spatter (in order of importance):
1. Check or reset WFS & Volts on chart inside door.
2. Increase drag angle.
3. Decrease CTWD.
4. Decrease travel speed.
To Correct Poor Penetration (In order of priority):
1. Check or reset WFS & Volts on chart inside door.
2. Decrease CTWD.
3. Decrease speed.
4. Decrease drag angle.
If Arc Blow Occurs* (In order of priority):
NOTE: Try different work connection locations before
adjusting procedures.
1. Check or reset WFS & Volts on chart inside door.
2. Decrease drag angle.
3. Increase CTWD or weld in opposite direction.
4. Decrease travel speed.
*Arc blow is the effect of a magnetic field which forces
the arc from its normal path visual results are concave
face uneven leg lengths heavy spatter and porosity.
To Eliminate Stubbing** (In order of priority):
1. Check or reset WFS & Volts on chart inside door.
2. Decrease CTWD.
3. Increase drag angle.
** Stubbing occurs when the electrode drives through
the molten puddle and hits the bottom plate tending
to push the gun up.
Proper Gun Handling
Most feeding problems are caused by improper han-
dling of the gun cable or electrodes.
1. Do not kink or pull the gun around sharp corners.
2. Keep the gun cable as straight as practical when
welding.
3. Do not allow dolly wheels or trucks to run over the
cables.
4. Keep the cable clean.
5. Innershield electrode has proper surface lubrica-
tion. Use only clean, rust-free electrode.
6. Replace contact tip when it becomes worn or the
end is fused or deformed.