Tig Welding Problems - Boss ARC 140 Operating Manual

9.02

TIG welding problems

Weld quality is dependent on the selection of the correct consumables, maintenance of equipment and
proper welding technique.
Description
1. Excessive bead build-up
or poor penetration or
poor fusion at edges of
weld.
2. Weld bead too wide and
flat or undercut at edges
of weld or excessive
burn through.
3. Weld bead too small or
insufficient penetration
or ripples in bead are
widely spaced apart.
4. Weld bead too wide or
excessive bead build up
or excessive penetration
in butt joint.
5. Uneven leg length in
fillet joint.
6. Dirty weld pool.
7. Electrode melts
oxidizes when an arc is
struck.
8. Poor weld finish.
9. Arc flutters during TIG
welding.
10. Welding arc can not be
established.
BOSS ARC 140¡¢ 160 Operating Manual
Possible Cause
Welding current is too low.
Welding current is too high.
Travel speed too fast.
Travel speed too low.
Wrong placement of filler rod.
A Electrode contaminated through
contact with work piece or filler rod
material.
B Gas contaminated with air.
A Electrode is connected to the " +"
terminal.
B No gas flowing to welding region.
C Torch is clogged with dust.
or D Gas hose is cut.
E Gas passage contains impurities.
F Gas regulator turned off.
G Torch valve is turned off.
H The electrode is too small for the
welding current.
Inadequate shielding gas.
A Tungsten electrode is too large for
the welding current.
B Absence of oxides in the weld pool.
A Work clamp is not connected to the
work piece or the work/ torch leads
are not connected to the right
welding terminals.
B Torch lead is disconnected.
C Gas flow incorrectly set, cylinder
empty or the torch valve is off.
Increases weld current, and/ or faulty
joint preparation.
Decreases weld current.
Reduce weld speed.
Increase travel speed.
Re-position filler rod.
A Clean the electrode by grinding off
B Check gas lines for cuts and loose
A Connected the electrode to the " -"
B Check the gas lines for kinks or
C Clean torch.
D Replace gas hose.
E Dismantle a soft tube from the
F Turn on.
G Turn on.
H Increase electrode diameter or
Increase gas flow or check gas line for
gas flow problems.
A Select the right size electrode.
B Refer basic TIG welding guide for
A Connect the work clamp to the
B Connect it to the " −" terminal.
C Select the right flow rate, change
- 20 -
Remedy
the contaminates.
fitting or change gas cylinder.
terminal.
breaks and gas cylinder contents.
torch then raise gas pressure and
blow out impurities.
reduce the welding current.
Refer to basic TIG welding guide.
ways to reduce arc flutter.
work piece or connect the work/
torch leads to the right welding
terminals.
cylinders or turn torch valve on.