Thermal Arc 281 FABRICATOR, Руководство по обслуживанию

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FABRICATOR 281 WELDING MACHINE
TROUBLESHOOTING -4 Manual No. 0-4880B
FAULT CAUSE REMEDY
F. Weld cracking 1. Weld beads are too
small
a. Decrease travel speed
2. Weld penetration
narrow and deep
a. Reduce current and voltage and increase
Mig torch travel speed or select a lower
penetration shielding gas.
3 . E x c e s s i v e w e l d
stresses
a. Increase weld metal strength or revise
design
4. Excessive voltage a. Decrease voltage by reducing the voltage
selection switch.
5. Cooling rate too fast a. Slow the cooling rate by preheating part
to be welded or cool slowly.
6. Weld speed too fast a. Reduce weld speed.
G. Cold weld puddle. 1. Faulty rectifier unit a. Have an Accredited THERMAL ARC
Service Agent to test then replace the
faulty component.
2. Loose welding cable
connection.
a. Check all welding cable connections.
3. Low Primary Voltage a. Contact supply authority
4. Weld speed too fast a. Reduce weld speed.
H. Arc does not have
a crisp sound that
short arc exhibits
when the wirefeed
speed and voltage
a r e a d j u s t e d
correctly.
1. The MIG torch has
been connected to
the wrong voltage
polarity on the front
panel.
a. Connect the MIG torch to the positive
(+) welding terminal for solid wires and
gas shielded flux cored wires. Refer to
the electrode wire manufacturer for the
correct polarity.
2. Weld speed too fast a. Reduce weld speed.
Table 6-1b: Welding Problems and Solutions (continued)