Tweco 400 TS Arcmaster - Manual (Page 51)

44
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.