Tag Archives: Uniweld

Uniweld Tech Tip – Backfire & Flashback

Backfire

Backfire is the momentary retrogression of the flame into the torch that is usually signaled by a popping sound. The flame may either extinguish or re-ignite at the end of the tip. Sustained backfire (flashback) is the retrogression of flame into the torch with continued burning inside the torch. This event can be identified by an initial popping sound followed by a squealing or hissing sound caused by continued burning inside the torch.

What to do if backfire occurs

When this occurs, the torch oxygen valve should be turned off immediately; and then the fuel gas valve.

Flashback

Flashback is the return of the flame through the torch and into the hose and/or regulator and can potentially cause an explosion at any point in the system. It may also reach the cylinder. This event is caused by oxygen and fuel mixing in one side of the oxy-fuel system and subsequently being ignited at the tip and by reverse flow of one gas into the other side of the system.

What to do if flashback occurs

When this occurs, the torch oxygen valve should be turned off immediately; and then the fuel gas valve.

How to prevent a backfire or flashback

To avoid both Backfires and Flashbacks, be sure to properly match the torch tip size with the metal area being welded.

1. If using acetylene, keep the pressure below 15 pounds.
2. Purge your hoses before lighting the torch.
3. Never light your torch with a mixture of fuel and oxygen. After purging the lines, light the torch with only the fuel gas valve open.
4. Check valves should be installed on both torch inlets and operating properly. Check valves can stop the reverse flow of gases, but will not prevent flashbacks.
5. To prevent flashbacks, flashback arrestors must be installed on the outlets of both regulators, and/or torch inlets.

Check The Torch: How can you tell if the torch you are using has flashback arrestors and check valves? If you look at the torch you will notice a small cylindrical valve on each inlet with the hoses screwed onto this valve instead of hooked directly to the torch. Most of these valves are combination flashback/check valves and will say so on the valve body. Often, combination valves are also installed on regulator outlets.

Before welding, take time to inspect the equipment you will be using to be sure check valves and flashback arrestors have been installed. This precaution can prevent a deadly cylinder explosion.

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Video of Brazing With Nitrogen by Uniweld

Hello everyone!

Found this great video from Uniweld Tech Tips on Youtube! Check it out! https://www.youtube.com/watch?v=ApI2nT_ZNeg

Let us know what you think!

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Uniweld Tool Tip

Greetings!

Tool tip straight from Uniweld: When a piece is cut by an oxygen cutting process, a narrow width of metal is progressively removed. The width of the cut is called a Kerf. Kerf width is a result of the type of tip used, the tip size, the flow rate of oxygen and preheating gases and the speed of cutting.

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Uniweld & Noga Magnetic Base Sale!

Good morning everyone,

I hope your week is going well!

Don’t forget that we have our big Uniweld & Noga Magnetic Base Sale going on right now! 5% off all Uniweld products and 5% off select Noga Magnetic Bases! (List of bases can be found in featured section of the main page -> http://www.huronindustrial.com/ or below)

Use coupon code: UNIW5 on purchase of Uniweld items at check out to receive your savings!
Use coupon code: 5NOG on purchase of Noga Mag. Bases at check out to receive your 5% off!

Also, If you have any suggestions on what to put on sale next, let us know! We value all suggestions and will take them all into consideration!

If you have questions, comments, need help, or just want to chat, contact us!
Call us at: 1-800-800-4967 or 1-989-872-4385
Email us at: sales@huronindustrial.com

List of Noga Magnetic Bases includes:
Model #’s:
DG61003
MA61003
MG61003
PH2040
PH4016
*Click on the model number you wish to check out and you will be directed to it.

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