Valley FABRICATOR 251, Service Manual

Page: 50 / 104

4-12 August 22, 2008
FABRICATOR 251 SERVICE MANUAL
4.07 Stitch Welding Operation
Welding consumable costs can be r educed by r eplacing a continuous weld bead with the Stitch weld bead. It will
also r educe heat disto r tion in thin plate.
Coarse & Fine Voltage Selector Switches and Wire Speed Control
Set these cont r ols to obtain the desi r ed welding conditions fo r the wi r e and mate r ial being welded.
Mode Selector Switch
Set the WELD MODE switch to STITCH.
WELD (Spot/Stitch) Time
Adjust the WELD (Spot/Stitch)cont r ol knob fo r the desi r ed weld o r ‘ON’ time while stitch welding.
Dwell Time
Adjust the DWELL (Stitch) cont r ol knob fo r the desi r ed inte r val o r ‘OFF’ time while stitch welding.
SPOT WELDING NOZZLES
TYPE NO.4 400 AMP
24A-62-FAS
1240-1520 (5/8"
Bo
r e)
24A-75-FAS
1240-1530 (3/4"
Bo
r e)
Flat A r c Spot
24A-100-FAS
1240-1550
(1" Bo
r e)
Inside Co r ne r A r c Spot 24A-75-IAS
1240-1531
(3/4” Bo
r e)
Outside Co r ne r A r c Spot 24A-75-IAS
1240-1532
(3/4” Bo
r e)
Automotive Stud Nozzle N/A
Table 4-4: Spot Welding Nozzles
4.08 Spot Welding Operation
Fit an optional spot welding nozzle to the MIG gun
fo
r consistent spot welding ope r ations. Refe r to the
Spot Welding Nozzle table. The Fab r icato r 251 will
ope r ate effectively using .030” (0.8mm) elect r ode
wi r e when spot welding. Penet r ation depth is limited
when using .024”(0.6mm) elect r ode wi r e fo r spot
welding. Set the cont r ols as follows fo r spot welding:
Coarse & Fine Voltage Selector Switches and
Wirespeed Control
Select highe r Voltage Selecto r switch positions and
set the Wi r espeed Cont r ol between 354 to 590 ipm
(9 to 15 m/min) fo r maximum penet r ation.
Mode Selector Switch
Set the WELD MODE switch to SPOT.
Spot Time
Adjust the WELD (Spot/Stitch) cont r ol knob fo r the
desi r ed weld o r ‘ON’ time fo r spot welding.
Dwell Time
The
DWELL (Stitch) cont
r ol knob has no affect in
this mode of ope r ation.