Tweco 300 ACDC Arcmaster - Manual (Page 52)

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Description Possible Cause Remedy
5 Gas flow won’t
shut off.
A Weld Mode ( STD , SLOPE ,
REPEAT or SPOT ) was
changed before POST-FLOW
gas time had finished.
A Strike an arc to complete the
weld cycle.
OR
Switch machine off then on to
reset solenoid valve sequence.
B Gas valve is faulty. B Have an Accredited Thermal
Arc Service Agent repair or
replace the gas valve
C Gas valve jammed open. C Have an Accredited Thermal
Arc Service Agent repair or
replace the gas valve
D POST-FLOW control is set
to 60 sec.
D Reduce POST-FLOW time.
6 The TIG electrode has
been contaminated
due to the gas flow
shutting off before
the programmed
POST-FLOW time
has elapsed.
The Weld Process Mode
(STICK, HF TIG or LIFT TIG)
was changed before
POST-
FLOW gas time had finished.
Do not change Weld Process
Mode before the
POST-FLOW
gas time had finished.
Table 10-3 (continued). Power Source Problems