Figure 4-11.One piece oxygas cutting torch.
Figure 4-12.Cutting attachment for combination torch.
an additional tube for high-pressure cutting oxygen.The
flow of high-pressure oxygen is controlled from a valve
on the handle of the cutting torch. In the standard cutting
torch, the valve may be in the form of a trigger assembly
like the one in figure 4-11. On most torches, the cutting
oxygen mechanism is designed so the cutting oxygen
can be turned on gradually. The gradual opening of the
cutting oxygen valve is particularly helpful in opera-
tions, such as hole piercing and rivet cutting.
Most welding torches are designed so the body of
the torch can accept either welding tips or a cutting
attachment. This type of torch is called a combination
torch. The advantage of this type of torch is the ease in
changing from the welding mode to the cutting mode.
There is no need to disconnect the hoses; you just
unscrew the welding tip and then screw on the cutting
attachment. The high-pressure cutting oxygen is con-
trolled by a lever on the torch handle, as shown in figure
Cutting Torch Tips
As in welding, you must use the proper size cutting
tip if quality work is to be done. The preheat flames must
furnish just the right amount of heat, and the oxygen jet
orifice must deliver the correct amount of oxygen at just
the right pressure and velocity to produce a clean cut.
All of this must be done with a minimum consumption
of oxygen and fuel gases. Careless workers and workers
not acquainted with the correct procedures waste both
oxygen and fuel gas. This does not seem important when
you are working in a shop, but if you are deployed, it