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CHECK FOR GAS LEAKAGE
Check for gas leakage after each time the welding unit is set up for TIG welding and at
regular intervals.
The recommended procedure is as follows:
1.
Connect the regulator and gas hose assembly and then tighten all connectors and clamps.
2.
Slowly open the cylinder valve.
3.
Set the flow rate on the regulator to approximately 15 to 25 CFH.
4. Close the cylinder valve and pay attention to the needle indicator on the regulator's
pressure gauge. If the needle drops away towards zero, there is a gas leak.
Sometimes a gas leak can be slow and difficult to identify. Leave the gas pressure in the
regulator and line for an extended time. Perform the test as above, but reduce the flow rate
to 16 to 21 CFH. Close the cylinder valve and check after a minimum of 15 minutes.
5.
After confirming there is a loss of gas, check all connectors and clamps for leakage by
brushing or spraying with soapy water. Bubbles will appear at the leakage point.
6.
Tighten clamps or fittings to eliminate gas leakage. Replace the clamps and fittings if this
fails to solve the problem.
WIRE INSTALLATION AND SET UP
The correct installation of the wire spool and the wire into the wire feed unit is critical to
achieving an even and consistent wire feed. Poor set up of the wire into the wire feeder is a
major cause of fault with MIG welding machines. The guide below will assist in the correct setup
of your wire feeder.
1.
Remove the spool retaining nut (Fig. 9). The spool retaining nut is left hand threaded.
2.
Note the tension spring adjuster (Fig. 10-1) and spool locating pin (Fig. 10-2).
3.
Fit the wire spool onto the
spool holder. Fit the
locating pin into the
location hole on the spool
(Fig. 11). Replace the spool
retaining nut tightly.
4. Choose a drive roller based
on the thickness of the
welding wire. Unscrew the
knob holding the drive
roller in place and exchange the drive rollers. Replace knob and tighten.
4.1 Flux-Cored – Install a knurled drive roller. Apply a light amount of pressure to the drive
roller. Too much pressure will crush the cored wire.
4.2 Aluminum - Install a U-groove drive roller.
5.
Snip the wire carefully, be sure to hold the
wire to prevent the spool uncoiling. Carefully
feed the wire into the inlet guide tube of the
wire feed unit (Fig. 12).
6.
Feed the wire through the drive roller and
into the outlet guide tube of the wire feeder
(Fig. 13-1). Note that the pressure roller in this
welding machine is smooth, not geared as in
the picture.
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145A MULTI-PROCESS MIG-ARC-TIG WELDER
10-2
10-1
Fig. 9
Fig. 10
Fig. 12
8619470
Fig. 11
13-1
Fig. 13
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