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22
Basic MIG Welding .
10°
wire pointed ahead of bead wire pointed back into bead
travel direction travel direction travel direction
(A) Push Technique (B) Gun Perpendicular (C) Drag Technique
10°
at even weld prole
light penetration
narrower weld prole
even penetration
narrow higher weld prole
more penetration
Good weld quality and weld prole depends on gun angle, direction of travel, electrode exten-
sion (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.
Gun Position - Travel 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
prole and degree of weld penetration.
Push Technique - The wire is located at the leading edge of the weld pool and pushed towards the un-
melted work surface. This technique oers 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 atter weld prole with light penetration - useful for welding thin materials. The welds are
wider and atter allowing for minimal clean up / grinding time.
Perpendicular Technique - The wire is fed directly into the weld, this technique is used primarly for auto-
mated situations or when conditions make it necessary. The weld prole is generally higher and a deeper
penetration is achieved.
Drag Technique - The gun and wire is dragged away from the weld bead. The arc and heat is concentrat-
ed on the weld pool, the base metal receives more heat, deeper melting, more penetration and the weld
prole is higher with more build up.
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