Tweco Fabricator 141i Operating Manual - Manual (Page 63)

Fabricator 141i
Manual 0-5145 4-3 BASIC WELDING GUIDE
Vertical Fillet Welds
Art # A-08995
30° to 60°
Transverse
Angle
30° to 60°
Transverse
Angle
Direction of Travel
10°
Longitudinal Angle
10° to 20° Longitudinal
Angle
Figure 4-6
Overhead Weld
Art # A-08996
30° to 60°
Transverse Angle
Direction of Travel
5° to 15°
Longitudinal
Angle
Figure 4-7
Distance from the MIG Gun Nozzle to the Work Piece
The electrode wire stick-out from the MIG Gun nozzle should be between 3/8" (10mm) to 3/4" (20.0mm). This
distance may vary depending on the type of joint that is being welded.
Travel Speed
The speed at which the molten pool travels influences the width of the weld and penetration of the welding run.
MIG Welding Variables
Most of the welding done by all processes is on carbon steel. The items below describe the welding variables in
short-arc welding of 24 ga. (0.6mm) to ¼” (6.4mm) mild sheet or plate. The applied techniques and end results
in the MIG process are controlled by these variables.
Preselected Variables
Preselected variables depend upon the type of material being welded, the thickness of the material, the welding
position, the deposition rate and the mechanical properties. These variables are:
• Type of electrode wire
• Size of electrode wire
• Type of gas (not applicable to self shielding wires FCAW)
• Gas flow rate (not applicable to self shielding wires FCAW)
Primary Adjustable Variables
These control the process after preselected variables have been found. They control the penetration, bead width,
bead height, arc stability, deposition rate and weld soundness. They are:
• Arc Voltage
• Welding current (wire feed speed)
• Travel speed