PRO-POINT MIG-ARC-TIG 145A Manuel De L'utilisateur page 21

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6. The wire feed speed overcomes the heat of the arc and the wire again approaches the work
to short-circuit and repeat the cycle (Fig. 33).
BASIC MIG WELDING GUIDE
Good weld quality and weld profile depends on the 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.
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 profile 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 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 (Fig. 34).
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 (Fig. 35).
DRAG TECHNIQUE
The gun and wire are 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 (Fig. 36).
TRAVEL ANGLE
Travel angle is the right to left
angle relative to the direction
of welding. A travel angle of 5°
to 15° is ideal and produces a
good level of control over the
weld pool. A travel angle
greater than 20° will give an
unstable arc condition with
poor weld metal transfer, less
penetration, high levels of
spatter, poor gas shield and
poor quality finished weld (Fig. 37).
ANGLE TO WORK
The work angle is the forward or
back angle of the gun relative to
the workpiece.
The correct work angle provides
good bead shape, prevents
undercut, uneven penetration,
poor gas shield and poor quality
finished weld (Fig. 38).
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145A MULTI-PROCESS MIG-ARC-TIG WELDER
Angle 5° to 15°
Correct Angle
Fig. 34
Not Enough Angle
Not Enough Angle
8619470
Fig. 35 Fig. 36
Angle more than 20°
Fig. 37
Too Much Angle
Fig. 38
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