What is the advantage of using a combination welding and cutting torch?
What is a combination welding-cutting torch? A torch that can have a cutting head, welding tip, or a heating tip. State one advantage of owning a combination welding-cutting torch as opposed to just having a cutting torch. You can use it for multiple tasks.
Can multiple torches can be mounted on a cutting machine?
The oxyfuel gas cutting torch is mounted on a strong beam. Several cutting torches may be mounted on the same beam. This allows the motor-driven beam-mounted torch machine to cut several parts at the same time. See Figure 22-15.
What are the two major methods for controlling distortion while making a cut?
The two major methods for controlling distortion while make a cut is making two parallel cuts at the same time and speed and making a short cut and skipping a strip to keep the plate from separating.
What happens when you mix oxygen and acetylene?
Oxygen and acetylene together (oxy-acetylene) produces a flame temperature of 3150 °C, making it the hottest of all the fuel gases and the only fuel gas that can weld steel. In cutting, acetylene gives the fastest pre-heating and piercing times of any of the other fuel gas combinations.
Does oxygen or acetylene open first?
We recommend closing the oxygen valve first whenever turning off an oxy-fuel torch system especially when Acetylene is fuel. This is only part, but a very important part, of the complete safe operating procedure recommended for torches by Harris.
What pressure should oxygen and acetylene be set at for cutting?
40 psig
What PSI should oxy acetylene?
CAUTION: Never exceed 15 pounds per square inch (psi) when using Acetylene. NOTE: Most torch mixers use a “positive” design that requires fuel gas pressures set between 5-15 psi for cutting applications.
What PSI is a full acetylene tank?
250 psi
Why is my torch popping?
The reason that an oxyacetylene cutting torch will pop and go out is because of a problem with gas flow. Usually this is either an issue with flow settings, a leak or blockage.
What is the best way to set the oxygen pressure for cutting?
What is the best way to set the oxygen pressure for cutting? Increase the pressure slowly and readjust the flame as you watch the length of the clear cutting stream in the center of the flame.
What pressure should I set my cutting torch?
The gas pressures should be set at 3 to 5psi for Acetylene, and 20 to 30psi for the oxygen, but when you squeeze the oxygen lever after the initial flame adjustment of the preheat flames to neutral just to a point where the feather disappears,the oxygen cutting stream should be visible and at least 4 inches in length …
What is the most widely used fuel gas used for cutting?
Acetylene
Who was the one person most responsible for oxyacetylene cutting use?
Walter Roberts
What are the two types of flame cutting torches called?
There are two types of welding and cutting torches commonly used. They are the positive-pressure type (also known as an equal-pressure type or medium-pressure type torch), and the injector type.
Why are hoses purged after being connected to the regulators?
When connecting the system, and at least at the start of each shift, hoses and torch must be purged to remove any inflammable gas mixtures. It is essential the oxygen stream does not come into contact with oil which can ignite spontaneously.
How long should hoses be purged?
How long should hoses be purged? Long enough to allow any air or unwanted gases to be replaced by the gas being used. 24.
How can a leak around a torch valve stem Be Stopped?
If you detect leakage around the valve stem of a torch throttle valve (test must be made after the torch has been lit) you can usually stop the leak by tightening the valve packing nut. Occasionally, it may be necessary to replace a valve packing washer, or replace the complete valve stem assembly.
What is the difference between a backfire and a flashback?
SUSTAINED BACKFIRE: Flame enters into nozzle or torch and continues burning inside with a hissing or whistling noise. FLASHBACK: Gas with higher pressure flows back through the torch into the hose with a lower pressure.
What is an example of flashback?
For example of flashback, consider the following short story interrupted by flashback: A man is about to give a speech to a large audience on biology. Suddenly, he remembers playing with frogs and toads in his backyard as a curious child. In this example, the flashback happens when the man remembers his childhood.
What causes a backfire?
A backfire is caused by a combustion or explosion that occurs when unburnt fuel in the exhaust system is ignited, even if there is no flame in the exhaust pipe itself. Sometimes a flame can be seen when a car backfires, but mostly you will only hear a loud popping noise, followed by loss of power and forward motion.
What is important to control backfire in gas cutting sets?
Precautions to be taken when a backfire occurs: Close both the oxygen and acetylene station or cylinder valves immediately. The very important thing is that in the case of flashback do not change the setting of torch valves or regulator adjusting screws. Keep the equipment intact.
What are the safety precautions for gas cutting?
General Gas Welding Safety Tips
- Inspect equipment for leaks at all connections using approved leak-test solution.
- Inspect hoses for leaks and worn places.
- Replace bad hoses.
- Protect hoses and cylinders from sparks, flames, and hot metal.
- Use a flint lighter to ignite the flame.
What are the hazards of gas cutting?
Eye injuries, such as discomfort and burns from the intense light and heat emitted from the operation, and cataracts caused by radiation from molten metal, leading to inability to see things clearly, or corneal ulcer and conjunctivitis from foreign particles e.g. slag and cutting sparks.
What gauge is used to indicate the amount of gas that remains in a cylinder?
pounds per square inch gauge