Tag Archives: Tech Tip

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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How To Get More Life From Your Cutters

Are your hole cutters, annular cutters, and other cutters wearing out too fast? This is a very common concern and problem among those who use cutters on a regular basis. Everyone wants to have long life out of their cutters. Longer life means more cutting, which means more work done, which means more profit. Also, the longer the life, the less you will have to purchase new cutters for the job!

Helpful Tips

Hougen Mfg. has been very kind to give out some tips to keep your cutters, magnetic drills, and such running smooth and having a longer life. Many may seem trivial, but don’t underestimate the small trivial things as they can have a very large impact!

  • #1 cause of broken or prematurely dull cutters is too slow of a feed rate. Slower feed rates will not add life to your cutter but actually reduce the cutter’s life. Use firm steady feed pressure throughout the cut.
  • Always make sure to clear chips from your cutter before starting the next hole.
  • Make sure support system for drill arbor is in place and not worn out. If using on a drill press, a support system must be used.
  • For harder materials, use the appropriate cutter material. Like premium cutters and carbide tipped or solid carbide cutters! Hougen has a very nice line of Premium Cutters and Copperhead™ Carbide Tipped Cutters.
  • Make sure mag drill is on a clean work piece and securely attached. Uneven or large build up of debris can cause drill slippage. Material must be at least 3/8″ thick. Painted material can also be troublesome if paint buildup does not allow magnet to hold securely.
  • When slug ejection becomes unreliable or tool resists cutting, resharpen or replace your cutter. For Hougen drills, you can have them sent in or purchase a sharpening machine so you can sharpen them right at home or the shop! Talk about saving money!
  • Always use coolant when drilling. For best results with Hougen cutters, use Hougen’s Slick-Stik™ or RotaMagic™ cutting lubricant.
  • For best performance always maintain your drill as instructed in your operator’s manual.
  • And as always, always observe standard and specific safety instructions.

When it eventually is time to purchase a new set of cutters, check out Hougen’s cutters as they are of very high quality. They have excellent customer support if you are in need of answers or help. If you would like more information on Hougen cutters, please visit a previous blog post on “Hougen® Rotabroach® Annular Cutters – Simply The Best!”. Contact us at 1-800-800-4967 or visit our site www.huronindustrial.com for even more information or to order.

Useful Links:

More Tips?

Experience is the best teacher for learning the tips and tricks of trades. If anyone else has tips on how to get more out of your cutters, extend the life of your machines and cutters, or general tips, leave them below!

For any comments or questions, please comment below or contact us at 1-800-800-4967, or email us at sales@huronindustrial.com

* HSS is short for High Speed Steel

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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