Weldarc 135, 145, 185 | Operator Manual | Model No MC110-0 / MC111-0 / MC112-0
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Problem
Likely Reason
Outcome
MMA/STICK Models
In MMAW (Stick), the arc is
difficult to strike.
The technique required
for VRD enabled welding
machines is not the same as
earlier stick welding units.
The technique to strike
should be reviewed, not as
a ‘strike’ but more as ‘touch,
twist, lift’ motion.
If VRD is not a site
requirement, VRD can be
disabled by service agent .
GTAW/TIG Models
Tungsten burns up on arc
start.
The polarity of the electrode/
return cables is incorrect.
Gas not turned on
Gas flow too low
Not enough Pregas time
Polarity should be confirmed
for the process/wire type in
use
Review gas set up.
The weld has small black
‘lumps’ or ‘dots’ appearing
in the pool. Cleaning is
poor.
Old or dirty filler rods can
often be the cause of ‘dirty’
TIG welding operations.
Switching filler rods to
another type or batch may
solve this issue.
Weld is contaminated with
small bubbles (presence
of porosity).
The gas hose is not securely
connected at the machine or
at the regulator.
Ensure the gas connections
from regulator through to
the torch connection are
sufficiently tightened.
Presence of porosity at
weld start.
The torch gas hose has not
been purged sufficiently.
Purge the system and
confirm sufficient gas flow
through the regulator.
