Matco Tools MP200DVILCD Owner's Manual page 30

The HORIZONTAL POSITION is performed very similarly to the flat weld except that
angle B (see HOLDING THE TORCH) is such that the wire, directed more toward the
metal above the weld joint, is to help prevent the weld puddle from running downward
while still allowing slow enough travel speed. A good starting point for angle B is about
30 degrees DOWN from being perpendicular to the work piece.
VERTICAL POSITION it is easier for many people to pull the torch from top to bottom. It
can be difficult to prevent the puddle from running downward. Pushing the torch from
bottom to top may provide better puddle control and allow slower rates of travel speed to
achieve deeper penetration. When vertical welding, angle B (see HOLDING THE
TORCH) is usually always kept at zero, but angle A will generally range from 45 to 60
degrees to provide better puddle control.
The OVERHEAD POSITION is the most difficult welding position. Angle A (see
HOLDING THE TORCH) should be maintained at 60 degrees. Maintaining this angle will
reduce the chances of molten metal falling into the nozzle. Angle B should be held at
zero degrees so that the wire is aiming directly into the weld joint. If you experience
excessive dripping of the weld puddle, select a lower heat setting. Also, the weave bead
tends to work better than the stringer.
d. Multiple Pass Welding
Butt Weld Joints When butt welding thicker materials; you will need to prepare the
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