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Harris Type Welder - Style M
9
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8345076 V 1.0
WELDING: PRACTICES AND EXERCISES
Gas welding is not a difficult art. The following exercises of torch movement are good practice, and make subsequent
welding easy.
Take a small welding tip and set proper pressures (see chart on page 8). Point the flame directly onto the steel (1/8”
stock recommended) with the flame cone just above the metal surface. When a puddle is formed, move the torch
back and forth and move the puddle across the steel. Do this slowly. It is necessary to have good penetration, and this
comes from a deep puddle. When moving the puddle, it is helpful to lean the tip about 45° away from the direction
you want the puddle to move (Figure 1).
Place two pieces of 1/8” steel together as shown in figure 2. Make the puddle again and, with a back and forth torch
motion, move the puddle along the seam. Go slowly to get good penetration. You can check this by turning the parts
over. The penetration should be visible from the bottom. Test the weld strength by attempting to tear the parts apart.
Figure 1 Figure 2
Repeat exercise 2, but add welding rod this time. While the flame is directed at the steel in order to form the puddle,
put the rod into the flame. When it gets red, maintain this temperature by moving it in and out of the flame. Once the
weld is started, dip the rod into the puddle. This builds up the weld so that the top is rounded instead of concave when
no rod was used. Remember, welding rod is necessary on all double joints and once experienced, the welder will
prefer to use rod on all welds, regardless of the thinness of the steel (Figure 3).
Material 3/16” or thicker should be beveled before welding. A 30° bevel on each piece is best. This is necessary to
obtain good penetration through the entire thickness. A rod is necessary filler metal on all welds made from beveled
edges. Once the torch movement and puddle control are mastered, the welder can make vertical, horizontal, or flat
welds (Figure 4).
Figure 3 Figure 4