Tweco 200 ACDC Arcmaster(Feb2006) - Manual (Page 51)

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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.