37
SECTION 4 OPERATION
4.6.3 SPOT WELDING MODE OPERATION
A. Place the three-position toggle switch in “Spot” position.
B. Replace the standard nozzle with the No. 12 Spot weld Nozzle P/N 999625.
C. Trim the welding wire back so the end is slightly inside the nozzle.
D. Set the “coarse” and “fine” voltage control switches and wire speed, (see
Table 4.1), for the thickness of the metal being welded and the diameter
of the weld wire being used. Set spot time as desired for best weld.
E. To spotweld:
a. Press the torch nozzle squarely on the top plate. Apply enough pressure
to hold the two pieces of metal firmly together, so there is no loose play
between them.
b. Pull the trigger, holding the gun motionless and firmly. The electrode
wire and shielding gas will be fed to the work, and the arc will be
maintained for the length of time set in Step D. above.
c. After the preset time has elapsed, the wire will stop feeding, the arc
will be broken, and the shielding gas will stop flowing.
A good spotweld will penetrate through both layers of metal, and will
have a small nugget on the reverse side, (Fig. 4.5)
4.6.4 STITCH WELDING MODE OPERATION
A. Place the three-position toggle switch in “Stitch” position. The stitch weld
mode uses a series of pre-timed arc-on/arc-off time sequences to allow
cooler welding.
B. Be sure a standard nozzle (and not a spot weld nozzle) is installed on the
torch.
C. Set the length of time the arc will be ON for each sequence by adjusting the
Spot-Stitch Weld Time control on the power supply’s front panel. This
timer has an approximate range of from 0.4 seconds at the minimum setting
to 3.5 seconds at the maximum setting. Set the length of time the arc will be
OFF for each sequence by adjusting the Stitch Weld Time control on the
front panel. This timer has an approximate range of from 0.4 seconds at
the minimum setting to 3.5 seconds at the maximum setting.
D. Set the “coarse” and “fine” voltage control switches and wire speed as
specified in Table 4.3 under Continuous Weld Conditions for:
a. The type weld being made (see diagrams to the left of each column of
figures).
b. The thickness of the metal being welded.
c. The gap (if any) between the pieces being welded.
d. The diameter of the welding wire being used.
E. When using the Stitch weld mode, before starting the weld the welding wire
should extend about 1/2-in. beyond the end of the nozzle. Adjust this length
by either clipping off the end of the wire with insulated cutters or by using the
torch switch.
F. During the welding, use the same welding techniques as described in
Section 4.4.
Figure 4.5 - Cross Section of Good Spotweld
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