H&S HSM250 - §6.4 MMA Welding - Trouble Shooting

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Contaminated base metal
or filler wire
Remove contaminating materials
like paint, grease, oil, and dirt,
including mill scale from base
metal. Remove all grease and oil
from filler metal
7
Arc difficult to
start or will not
start DC welding
Incorrect machine set up
Check machine set up is correct
No gas, incorrect gas flow
Check the gas is connected and
cylinder valve open, check hoses,
gas valve and torch are not
restricted. Set the gas flow
between 20-40 CFH flow rate
Incorrect tungsten size or
type
Check and change the size and
or the tungsten if required
Loose connection
Check all connectors and tighten
Earth clamp not connected
to work
Connect the earth clamp directly
to the work piece wherever
possible
§6.4 MMA Welding - Trouble Shooting
The following chart addresses some of the common problems of MMA welding. In all
cases of equipment malfunction, the manufacturer’s recommendations should be strictly
adhered to and followed.
NO.
Trouble
Possible Reason
Suggested Remedy
1
No arc
Incomplete welding circuit
Check earth lead is connected.
Check all cable connections.
Wrong mode selected
Check the MMA selector switch is
selected
No power supply
Check that the machine is
switched ON and has a power
2
Porosity − small
cavities or holes
resulting from
gas pockets in
weld metal
Arc length too long
Shorten the arc length
Work piece dirty,
contaminated or moisture
Remove moisture and materials
like paint, grease, oil, and dirt,
including mill scale from metal
Damp electrodes
Use only dry electrodes
3
Excessive Spatter
Amperage too high
Decrease the amperage or
choose a larger electrode
Arc length too long
Shorten the arc length