Tweco 251 Thermal Arc Fabricator - Manual (Page 44)

FABRICATOR 251
OPERATION 4-6 Manual No. 0-4847
4.02 Weld Mode Selector
The Weld Mode Selector switch selects the method of welding mode.
Art # A-07183_AB
WELD MODE WELD
(SPOT / STITCH)
(STITCH) DWELL
2T
SPOT STITCH
4T
t t
t
MIN
1
5
7
9
3
2
4
6
8
MIN
5
7
12
3
2
4
6
8
9
10
11
Figure 4-5: Internal Welding Controls
2T (Continuous Welding):
This mode of welding is used to weld two or more
components together with a continuous weld. When
the MIG gun trigger switch is depressed welding com-
mences. When the MIG gun trigger switch is released
welding ceases.
WELD MODE WELD MODE
2T 2T
SPOT SPOT STITCH STITCH
4T 4T
Art # A-07427_AB
Figure 4-6: For Reference only
SPOT:
This mode of welding is used to weld two plates to-
gether at a desired location by melting the top & bot-
tom plates together to form a nugget between them.
The spot time period is set by the Weld (Spot/Stitch)
control knob located in the electrode wire compart-
ment. (Refer to Figure 4-6 for control).
Art # A-07466
Figure 4-7: Spot Weld
NOTE
A spot nozzle should be used on the MIG gun
to obtain consistent spot welds.