Oxy Acetylene Welding and Cutting Equipment and Setup

Oxy Acetylene Welding and Cutting

Equipment and Setup

Required Oxyacetylene Welding Equipment

• Oxygen regulator• Acetylene regulator• Oxygen/ Acetylene welding hose• Hose couplings• Single-purpose cutting torch or welding torch• Cylinders and cart for portability• Flash arrestor and check valves (protective

equipment)• Flint lighter to ignite torch

Approved Protective Equipment

• Installed in OAW system to prevent:

– Backflow of oxygen into fuel-gas supply

system

– Passage of flashback into fuel-gas supply

system

– Excessive back pressure of oxygen in fuel-

gas supply system

Equipment

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Wide assortment

of tipsThermadyne Industries, Inc.


Equipment setupfor welding

Portable tank outfits are

mounted on a truck

Thermadyne Industries, Inc.

Pressure Regulators

• Reduce high cylinder pressure to relatively low pressure of 0 to 45 p.s.i. used for welding

• Maintain pressure without variation during welding– Flame remains steady and uniform

• Two pressure gauges mounted on body of regulator– One shows pressure in cylinder, other

pressure of gas being supplied to torch

Pressure Regulators


Union for attachment to cylinders

Outlet connection for hose leading to torch

Pressure of cylinder

Pressure of gas being suppliedto the torch

Hand screw which adjusts working pressure


Regulator Construction

• Internal mechanism of oxygen regulator• Oxygen Enters regulator at left at 2,200

p.s.I. and must leave regulator at desired pressure for welding – 10 p.s.i.


Regulator Construction

• Force that opens valve provided by tension of spring

• Force that closes valve provided by high gas pressure from tank

• When two forces balanced, constant flow of oxygen to torch results

Two Types of Oxyacetylene Welding Torches

• Injector– Acetylene carried through torch and tip at low

pressure by suction force• Higher oxygen pressure passing through small

orifice of injector nozzle

– Mixing head and injector integral part of tip

• Equal (balanced-pressure)– Both gases delivered at equal pressures– Mixing head separate replaceable unit in body

of torch

Injector Torch


The acetylene is carried Through the torch and tip at low pressure by the suction force of the higher oxygen pressure passing through the small orifice of the injector nozzle.

Linde Division, Union Carbide Corp.

Injector Type Mixer

The oxygen passing through theVenturi (1), pulls the fuel gasavailable in chamber (2). The

gasesare mixed, starting at point (3).


Equal-pressure (balanced- pressure) torch


Balanced-Pressure Type Mixer

The gases are mixed, beginning at point (3), throughout

the mixing chamber.

The two gases are fed in at points (1) fuel gas and (2) oxygen


Torch Tips

• Size measured by diameter of end opening – Marked on side of tip

• Most common system: numbers from 000-15– Larger the number, larger hole in tip and greater

volume of heat provided

• Tips for injector torches provided with individual mixers so mixer and tip one unit

• Most made of pure drawn copper

Oxygen and Acetylene Hose

• Especially manufactured for purpose– Siamesed (two built in one)

–Colors of Hose– Green for oxygen– Red for acetylene– Black for inert gas and air



Lighters

• Use friction spark lighter to light welding torch

• Safety note: Never use matches– Puts welder's hand too close to torch tip

where it may be burned when gases ignite– Gas lighters may explode in your hand or

pocket.



Filler Rod• Most gas welding done with filler rod

– Provides additional metal to form larger weld bead

– Many diameters, available in bundles of 50 or 100 pounds and boxes up to 300 pounds net weight

– 36 inches long

• Steel rods copper coated to prevent rusting• Some aluminum rods flux coated

– Both Braze and aluminum 28 inches long

Documents

Oxy Acetylene Welding and Cutting Equipment and Setup