PRO-POINT MIG-ARC-TIG 145A Manuel De L'utilisateur page 31

V1.0
MIG WELDING
PROBLEM(S) POSSIBLE CAUSE(S)
Excessive 1. Wire feed speed set too high.
Spatter
2. Voltage too high.
3. Wrong polarity set.
4. Stick out too long.
5. Contaminated base metal.
6. Contaminated MIG wire.
7. Inadequate gas flow or too
much gas flow.
Porosity - small 1. Wrong gas.
cavities or holes
2. Inadequate gas flow or too
resulting from
much gas flow.
gas pockets in
3. Moisture on the base metal.
weld metal.
4. Contaminated base metal.
5. Contaminated MIG wire.
6. Gas nozzle clogged with
spatter, worn or out of shape.
7. Missing or damaged gas
diffuser.
8. MIG torch euro connect
o-ring missing or damaged.
Wire stubbing 1. Holding the torch too far
during welding away.
2. Welding voltage set too low.
3. Wire Speed set too high.
Lack of Fusion 1. Contaminated base metal.
− failure of weld
2. Not enough heat input.
metal to fuse
3. Improper welding technique.
completely with
base metal or a
proceeding
weld bead
Excessive Too much heat.
Penetration −
weld metal
melting through
base metal
Lack of 1. Poor in incorrect joint
Penetration − preparation.
shallow fusion
2. Not enough heat input.
between weld
3. Contaminated base metal.
metal and base
metal
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145A MULTI-PROCESS MIG-ARC-TIG WELDER
SUGGESTED SOLUTION(S)
1. Select lower wire feed speed.
2. Select a lower voltage setting.
3. Select the correct polarity for the wire used - see
4. Bring the torch closer to the work.
5. Remove materials like paint, grease, oil and dirt, including
6. Use clean dry rust free wire. Do not lubricate the wire
7. Check the gas is connected; check hoses, gas valve and
1. Check that the correct gas is being used.
2. Check the gas is connected, check hoses, gas valve and
3. Remove all moisture from base metal before welding.
4. Remove materials like paint, grease, oil and dirt, including
5. Use clean dry rust free wire. Do not lubricate the wire
6. Clean or replace the gas nozzle.
7. Replace the gas diffuser.
8. Check and replace the o-ring..
1. Bring the torch closer to the work and maintain stick out
2. Increase the voltage.
3. Decrease the wire feed speed.
1. Remove materials like paint, grease, oil and dirt, including
2. Select a higher voltage range and /or adjust the wire
3. Keep the arc at the leading edge of the weld pool. Gun
Select a lower voltage range and/or adjust the wire
speed to suit Increase travel speed.
1. Material too thick. Joint preparation and design needs to
2. Select a higher voltage range and /or adjust the wire
3. Remove materials like paint, grease, oil and dirt, including
Installation & Operation For MIG With Gas or Installation
& Operation For Gasless MIG.
mill scale from base metal.
with oil, grease etc.
torch are not restricted. Set the gas flow between 21 to
30 CFH flow rate. Check hoses and fittings for holes,
leaks, etc. Protect the welding zone from wind and
drafts.
torch are not restricted. Set the gas flow between 21 to
30 CFH flow rate. Check hoses and fittings for holes,
leaks etc. Protect the welding zone from wind and drafts.
mill scale from base metal.
with oil, grease etc.
of 5 to 10 mm.
mill scale from base metal.
speed to suit.
angle to work should be between 5 and 15°. Direct the
arc at the weld joint Adjust work angle or widen groove
to access bottom during welding. Momentarily hold arc
on side walls if using weaving technique.
allow access to bottom of groove while maintaining
proper welding wire extension and arc characteristics.
Keep the arc at the leading edge of the weld pool and
maintain the gun angle at 5 and 15° keeping the stick out
between 1/8 to 1/4 in.
speed to suit Reduce travel speed.
mill scale from base metal.
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