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 6mm mild sheet or plate. The applied techniques and end results
in the MIG process are controlled by these variables.
Preselected variables depend upon the type of material being welded, the thickness of the material, the
welding posi on, the deposi on rate and the mechanical proper s.
These variables are:
1. Type of welding wire
2. Size of welding wire
3. Type of shielding gas
4. Gas flow rate
These control the process a er preselected variables have been found. They control the penetra on,
bead width, bead height, arc stability, deposi on rate and weld soundness.
These variables are:
1. Arc Voltage
2. Welding current (wire feed speed)
3. Travel speed
These variables cause changes in primary adjustable variables which in turn cause the desired change
in the bead forma on. They are:
1. S ck-Out: This is the distance between the end of the contact tube ( p) and the end of the
welding wire). Maintain at about 10mm s ck-out for solid wire and 15-20mm for gasless wire.
Figure 40
2. Wire Feed Speed: Increase in wire feed speed increases weld current/amperage. Decrease in
wire feed speed decreases weld current.
5.7 MIG Welding (GMAW) Variables
5.7.1 Preselected Variables
5.7.2 Primary Adjustable Variables
5.7.3 Secondary Adjustable Variables
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EZIMIG185C
Summary of Contents for EZIMIG185C
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