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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.
EXERCISE 1
Using a small welding nozzle and
correct pressures (see table on page
9), point the flame directly onto the
steel (3.2mm stock recommended)
with the flame cone just above the
metal surface. When a puddle
begins to form, slowly move the torch
back and forth to move the puddle
across the steel. This action has to be
done slowly as it is necessary to have
good penetration, which comes from
a deep puddle. When moving the puddle, it is helpful to lean the nozzle at an
angle of approx 45º away from the direction you want the puddle to move.
EXERCISE 2
Place two pieces of 3.2mm steel
together as shown. Make the puddle
again with a back and forth torch
motion, move the puddle along the
seam. Move the torch slowly for a
good penetration. This can be
checked by turning the parts over.
The penetration should be visible
from the bottom side. Test the weld
strength by attempting to pull the
pieces apart.
EXERCISE 3
Repeat exercise 2, but add welding
rod this time. While the flame is
directed at the steel to form the
puddle, put the rod into the flame.
when it becomes red, maintain this
temperature by moving it in and out
of the flame. Once the weld is started
dip the rod into the puddle, the rod
will melt and build up the weld so
that the top is rounded instead of
concave. Remember, welding rod is
