What causes backfire during gas cutting?

Backfire: The same thing can happen with high oxygen pressure and low fuel gas pressure if a backfire occurs, which is usually caused by holding the cutting torch too close to your work. This causes gas starvation of the cutting flame and results in the flame being sucked into the torch head.
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How do you prevent a gas welding backfire?

To reduce backfires and flashbacks, use flashback arrestors and purge hose lines before lighting the oxy-fuel gas torch. Purging flushes out any combustible oxygen-fuel gas or air-fuel gas mixtures in the hoses.
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What causes backfire during oxy-acetylene gas welding?

The regulator pressures and/or gas flows are incorrect. The nozzle is blocked. The nozzle has been held too close to the work. The nozzle has become overheated.
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What causes the pop sound during gas welding work?

A backfire (a single cracking or 'popping' sound) is when the flame has ignited the gases inside the nozzle and extinguished itself. This may happen when the torch is held too near the workpiece. A flashback (a shrill hissing sound) when the flame is burning inside the torch, is more severe.
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What is backfire of acetylene?

In a sustained backfire the flame burns, back into the torch handles mixing point (where oxygen and acetylene is mixed). It is characterised by an initial bang (backfire) followed by a whistling sound. If it is not quickly interrupted, the torch will melt and escaping combustion products can cause injuries.
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GCEacademy (6) - FLASHBACK (Backfire, Sustained backfire, Flashback)



What is the common cause of backfire?

If too much fuel is added to the engine, it may not all burn up before the exhaust valves open -- letting unburned gasoline into the red-hot exhaust headers, where it can combust and lead to a backfire. Too much fuel could be getting into your engine due to damaged and leaking fuel injectors or bad engine sensors.
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Which of the following is a cause of a backfire?

Common causes of backfire are running rich (too much fuel going into cylinders) or faulty ignition, possibly a fouled (dirty) spark plug, coil, or plug wire. Pop-backs are usually caused by problems with timing.
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What should oxygen and acetylene regulators be set at?

Recommended oxy/acetylene cutting tip pressures vary with size. If you have no manufacturer setting- information, and are cutting less than 1 ½” thick steel, set the acetylene regulator for 10 psig, and the oxygen regulator for 40 psig.
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What pressure should I set oxy acetylene for cutting?

Adjust the screws on the regulators so the gauge reads the proper psi. You will want between 40 and 60 psi for the oxygen tank and 10 psi for the acetylene tank.
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What gas makes a popping sound?

Hydrogen gas makes a small pop explosive sound when burnt.
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Why does oxyacetylene torch pop?

Another problem could be that, while lighting the torch, the viewer is opening the acetylene valve just slightly, then turning on the oxygen, which will cause it to pop every time. If you open up the acetylene more fully, then turn on the oxygen, no problem. Turn your oxygen off, then turn your acetylene off – no pop.
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What happens when acetylene gas is too much during welding?

A violent, explosive decomposition reaction can occur. pressure at or above 15 psig with red marking on the gauge. There are a number of incidents each year where a flashback into an acetylene cylinder triggers decomposition, leaving the cylinder in a dangerous, unstable condition. gas from backfeeding into the hoses.
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What is the immediate action that should be done if an oxy acetylene backfire occurs?

In the case of a backfire, the first priority should be to close the oxygen valve and then immediately close the acetylene valve. No operation is to be performed until the cause of the backfire is rectified.
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What fixes backfire?

Possible Fixes for Backfiring:

Lower engine speed slowly. Follow small engine fuel recommendations and/or switch to brands with low or no alcohol. Adjust carburetor for optimum performance. Inquire with equipment manufacturer about increasing air volume to decrease engine temperature.
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How do you control backfire?

How To Prevent Your Car From Backfiring
  1. Change oxygen sensors. ...
  2. Stop air leaks. ...
  3. Renew that spark. ...
  4. Check engine belts. ...
  5. Keep a healthy exhaust.
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What does a popping noise indicate when welding?

Popping and Hissing: This usually signifies a problem with the shielding gas. You will also see excessive sparks and slag, and pores in the finished weld. Check that the gas is on, there is gas in the tank and the tank pressure is correct. Another issue that can be identified by sound is wire stickout.
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What psi should you never operate acetylene over and why?

Acetylene is an extremely unstable gas. It has a very wide explosive range and it can be dangerously explosive at pressures above 15 psi. It is for these two reasons that acetylene must never be used at hose pressures greater than 15 psi.
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What psi should oxygen acetylene pressures be?

The fuel-gas pressure is 0.07 bar (1 psi - pound per square inch) or less. The oxygen pressure ranges between 0.7 to 2.8 bar (10 to 40 psi), depending on the size of the torch tip. A jet of relatively high-pressure oxygen produces the suction necessary to draw the fuel gas into the mixing head.
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What angle do you use for oxy acetylene welding?

The angle of bevel for oxyacetylene welding varies from 35 to 45 degrees, which is equivalent to a variation in the included angle of the joint from 70 to 90 degrees, depending upon the application.
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What is the 1 7 rule of acetylene?

The reduction of acetone can cause the cylinder to become unstable and dangerous. Additionally, liquid acetone will damage equipment; torches, regulators, tips, and hoses were not designed to handle acetone. The 1/7 rule simply means it is unsafe to flow more than 1/7th of an acetylene cylinder's total contents.
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What should you never set an acetylene regulator more than?

Turn it down for less gas and up for more. Don't forget: never over 15 psi on acetylene! Sorry about the repetition but, it's important! If shutting down your system, after shutting off the gas at the tank, release the diaphragm on the regulator and stop the flow of gas to the hose and torch.
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What causes sputtering and backfiring?

One of the most common causes of a sputtering engine is an issue with the vehicle's fuel system—the filter, pump, and injectors. These three critical components work together to ensure fuel flows smoothly from the fuel tank to your engine's fuel injectors, and then pumps into the engine evenly.
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What are the dangers of backfire?

A backfire is a loud pop or bang sound that comes from your exhaust pipes when your motorcycle is running. A motorcycle exhaust backfire is an annoying and potentially dangerous problem to have. It can hurt your ears if you're in a confined space, or could start a fire as some backfires even emit flames.
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Is backfire rich or lean?

1. Lean Air/Fuel Mixture. Not only can a rich air/fuel ratio cause a backfire, a mixture that doesn't have enough gasoline can cause a backfire, too. A "lean" mixture is one that doesn't have enough fuel, and too much air.
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