) Pressure
1/32 Tip No. 1 Head No. 2
1/16 2
5/64 3
3/32 3 4
3/8 4 5
3/16 5 6
1/4 6 7
5/16 7
3/8 8 8
1/2 9 10
5/8 10 12
3/4 11 15
Very heavy 12 15
_Cutting Torches._--Steel may be cut with a jet of oxygen at a rate of
speed greater than in any other practicable way under usual conditions. The
action consists of burning away a thin section of the metal by allowing a
stream of oxygen to flow onto it while the gas is at high pressure and the
metal at a white heat.
[Illustration: Figure 23.--Cutting Torch]
The cutting torch (Figure 23) has the same characteristics as the welding
torch, but has an additional nozzle or means for temporarily using the
welding opening for the high pressure oxygen. The oxygen issues from the
opening while cutting at a pressure of from ten to 100 pounds to the square
inch.
The work is first heated to a white heat by adjusting the torch for a
welding flame.
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