For practicing MIG welding, secure some pieces of 1.5mm or 2.0mm mild steel plate 150X
150mm. Use 0.8mm flux cored gas less wire or a solid wire with shielding gas.
3.3 Basic MIG Welding
Good weld quality and weld profile depends on gun angle, direction of travel, electrode extension (stick out),
travel speed, thickness of base metal, wire feed speed (amperage) and arc voltage. To follow are some basic
guides to assist with your setup.
[1] Gun Position -ravel Direction, Work Angle
Gun position or technique usually refers to how the wire is directed at the base metal, the angle and travel
direction chosen. Travel speed and work angle will determine the characteristic of the weld bead profile and
degree of weld penetration.
[A]Push Technique
The wire is located at the leading edge of the weld pool and pushed towards the un-melted work surface.
This technique offers a better view of the weld joint and direction of the wire into the weld joint. Push
technique directs the heat away from the weld puddle allowing faster travel speeds providing a flatter weld
profile with light penetration - useful for welding thin materials. The welds are wider and flatter allowing for
minimal clean up / grinding time.
[B] Perpendicular Technique
The wire is fed directly into the weld, this technique is used primarily for automated situations or when
conditions make it necessary. The weld profile is generally higher and a deeper penetration is achieved.
[C] Drag Technique
The gun and wire is dragged away from the weld bead. The arc and heat is concentrated on the weld pool,
the base metal receives more heat, deeper melting, more penetration and the weld profile is higher with more
build up.
[2]Travel Angel
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