H&S HSM250 - Page 73

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2
Porosity -
small cavities
or holes
resulting from
gas pockets in
weld metal.
Wrong gas
Check that the correct gas is
being used
Inadequate gas flow or too much
gas flow
Check the gas is connected,
check hoses, gas valve and
torch are not restricted. Set the
gas flow between 20-40 CFh
(6-12 l/min) flow rate. Check
hoses and fittings for leaks.
Protect the welding zone from
wind and drafts
Moisture on the base metal
Remove all moisture from
base metal before welding
Contaminated base metal
Remove materials like paint,
grease, oil, and dirt, including
mill scale from base metal
Contaminated MIG wire
Use clean, dry, rust free wire.
Do not lubricate the wire.
Gas nozzle clogged with spatter,
worn or out of shape
Clean or replace the gas
nozzle
Missing or damaged gas diffuser
Replace the gas diffuser
MIG torch euro connect o-ring
missing or damaged
Check and replace the o-ring
3
Wire stubbing
during welding
Holding the torch too far away
Bring the torch closer to the
work and maintain stick out of
5-10mm
Welding voltage set too low
Increase the voltage
Wire Speed set too high
Decrease the wire feed speed
4
Lack of Fusion
− failure of
weld metal to
fuse
completely.
Lack of Fusion
− failure of
weld metal to
fuse
completely.
Contaminated base metal
Remove materials like paint,
grease, oil, and dirt, including
mill scale from base metal
Not enough heat input
Select a higher voltage range
and /or adjust the wire speed
to suit
Improper welding technique
Keep the arc at the leading
edge of the weld pool.
Gun angle to work should be
between 5 & 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