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9.03 Power Source Problems
Description
1 The welding arc
cannot be
established
2 Maximum output
welding current can
not be achieved
with nominal
Mains supply
voltage.
3 Welding current
reduces when
welding
4 No gas flow when
the torch trigger
switch is
depressed.
Possible Cause
A
The Primary supply voltage
has not been switched ON.
B
The Welding Power Source
switch is switched OFF.
C Loose connections internally. C Have an Accredited Thermal
Defective control circuit
Poor work lead connection to
the work piece.
A
Gas hose is cut.
B
Gas passage contains
impurities.
C Gas regulator turned off.
D Torch trigger switch lead is
disconnected or switch/cable
is faulty.
44
Remedy
A
Switch ON the Primary supply
voltage.
B
Switch ON the Welding Power
Source.
Arc Service Agent repair the
connection.
Have an Accredited Thermal
Arc Service Agent inspect then
repair the welder.
Ensure that the work lead has a
positive electrical connection
to the work piece.
A
Replace gas hose.
B
Disconnect gas hose from the
rear of Power Source then
raise gas pressure and blow
out impurities.
C Turn gas regulator on.
D Reconnect lead or repair faulty
switch/cable.
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