Tweco VAF4 Transmig - Manual (Page 69)

TRANSMIG VAF4
Manual 0-5231 4-5 SERVICE
Butt & Horizontal Welds
Direction of
Travel
5° to 15°
Longitudinal
Angle
90°
Transverse
Angle
Art # A-08993
Figure 4-4 Butt & Horizontal Welds
Horizontal Fillet Weld
Direction of
Travel
5° to 15°
Longitudinal Angle
30° to 60°
Transverse Angle
Art # A-08994
Figure 4-5 Horizontal Fillet Weld
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 Vertical Fillet Weld
Overhead Weld
Art # A-08996
30° to 60°
Transverse Angle
Direction of Travel
5° to 15°
Longitudinal
Angle
Figure 4-7 Overhead Weld
Distance from the MIG Torch Nozzle to the Work
Piece
The electrode wire stick out from the MIG Torch nozzle
should be between 10mm to 20mm. 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 (GMAW) 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 0.6mm to 6.4mm) mild sheet
or plate. The applied techniques and end results in the
GMAW 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 proper-
ties. These variables are:
• Type of electrode wire
• Size of electrode wire
• Type of gas ((not applicable for FCAW self shield-
ing wires)
• Gas flow rate (not applicable for FCAW self shield-
ing wires)
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
Secondary Adjustable variables
These variables cause changes in primary adjustable
variables which in turn cause the desired change in the
bead formation. They are:
1. Stick-out (distance between the end of the
contact tube (tip) and the end of the electrode
wire). Maintain at about 10mm stick-out
2. Wire Feed Speed. Increase in wire feed speed
increases weld current, Decrease in wire feed
speed decreases weld current.