Section 5 − The Torch System; Torch; Gases; Tips - Smith Little Torch Owner's Manual

Fuel: The fuel for combustion may be the regulator itself if enough heat is
produced to reach the kindling temperature of the regulator's compo-
nents.
Kindling Temperatures: Enough heat may be generated to ignite the
regulator components by the friction created when recompressing
high-pressure oxygen. This heat is known as the heat of recompression.
If an internal fire or flashback occurs (indicated by a whistling
sound or inverted flame), do the following:
D
Turn off the torch oxygen valve immediately.
D
Turn off the torch fuel valve.
D
Turn off the oxygen cylinder valve.
D
Turn off the fuel gas cylinder valve.
Do not relight the torch until the equipment has cooled to the touch and
the flashback cause has been determined and corrected.
SECTION 5 − THE TORCH SYSTEM

5-1. Torch

The torch is designed to meet the requirements of industry for a small,
lightweight torch to fusion weld, braze, heat, and solder materials rang-
ing from 3/16 in. (5 mm) metal to ultra-fine wires. The six tips available
provide a wide range of flame sizes and the versatility to perform many
different tasks. Lightweight construction and highly flexible hose provide
pinpoint welding with maximum control.

5-2. Gases

The torch uses oxygen and these commonly available pressurized fuel
gases: acetylene, hydrogen, propane, propylene, or natural gas. The
smallest tip (size 2) can only be used satisfactorily with acetylene and
hydrogen fuel gases.
NOTICE − When using natural gas, a minimum of 1 psig (6.9 kPa) is re-
quired at the torch. Higher pressures are necessary for use with melting

tips.

5-3. Tips
There are six tips available for the torch. Because of their extraordinarily
small orifices, tip sizes 2 and 3 are fitted with a synthetic sapphire to en-
sure accurate gas flow. There are also two different heating tips avail-
able, one tip is for use with acetylene or hydrogen and another tip is de-
signed for propane or natural gas. Refer to the pressure
recommendation chart provided in this booklet for the tips being used.

5-4. Repairs/Replacement Of Hose

Replace hoses at the first sign of any defects, flaws, or dam-
age. The hoses should otherwise be replaced every four years.
Inspect hoses for damage or leaks before each operation. Do
not allow hoses to come in contact with hot metal, molten sol-
der, or corrosive chemicals. Do not expose hoses to fluxing
agents as these agents will deteriorate the hose materials and
cause them to leak.
Use an approved oil-free leak detection fluid to locate possible
leaks.
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