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position if at all possible as good results are easier to achieve.
HORIZONTAL POSITION Is performed very much the same as 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 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.
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.
6.4 Multiple pass welding
Butt Weld Joints
When butt welding thicker materials, you will need to prepare the edges of the material to be
joined by grinding a bevel on the edge of one or both pieces of the metal being joined. When this is done, a “
V”
is
created between the two pieces of metal, that will have to be welded closed. In most cases more than one pass or
bead will need to be laid into the joint to close the “
V”
.
Laying more than one bead into the same weld joint is known as a multiple-pass weld.
The illustrations in following figure show the sequence for laying multiple pass beads into a single “V” butt joint.
Summary of Contents for HIT140
Page 5: ...5 Assembly B FOR GASLESS WELDING ...
Page 6: ...6 C FOR GAS WELDING D FOR MMA WELDING ...
Page 21: ...21 ...
Page 22: ...22 ...
