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  • Teglove2
    started a topic Backpurging pipe HELP GUYS

    Backpurging pipe HELP GUYS

    Hey guys my name is Ryan and I am an aviation tig welder and fabricator of custom turbo kits on the side. I do A LOT of pipe welding and I REALLLLY need to find plugs I can use for the ends of my tubing to backpurge with and I do not have the time to make them and I know someone out there makes them. I searched and searched and couldnt find anything please help me out. Thx guys
    Ryan.

    P.S. the pipe im welding is 1.25/1.5/2.0" ID

  • Nathan128
    replied
    Backpurging pipe HELP GUYS

    Foam from an old couch cushion works well or for tape they make that aluminum foil tape it won't burn only the glue gets a bit messy.

    Leave a comment:


  • mark.c
    replied
    mark.c

    No need to purge aluminum makes no difference, I have welded pipes 100% xray without purge
    Last edited by mark.c; 02-27-2013, 10:54 PM.

    Leave a comment:


  • griff01
    replied
    Originally posted by Teglove2 View Post
    Hey guys my name is Ryan and I am an aviation tig welder and fabricator of custom turbo kits on the side. I do A LOT of pipe welding and I REALLLLY need to find plugs I can use for the ends of my tubing to backpurge with and I do not have the time to make them and I know someone out there makes them. I searched and searched and couldnt find anything please help me out. Thx guys
    Ryan.

    P.S. the pipe im welding is 1.25/1.5/2.0" ID
    http://www.intercononline.com/welding/mainpurg.htm
    http://files.aws.org/wj/2006/12/wj200612/wj1206-38.pdf

    Out of curiosity, I googled "pipe purge dams" and got 304,000 hits. Umm.

    Griff
    Last edited by griff01; 12-27-2008, 09:49 AM.

    Leave a comment:


  • FATFAB
    replied
    I have been using the aluminum foil and brake line for three decades. Nothing I have ever used is faster cheaper or simpler.

    A note on KB's point about positive pressure, once the atmosphere is displaced, you only need enough pressure to counteract atmosphere. Since the argon is denser than the atmosphere you can get a way with 1 - 3 psig.

    Leave a comment:


  • davedarragh
    replied
    "Italian Ingenuity or French Fantasia"

    Originally posted by MR.57 View Post
    One loaf of french bread will make about a dozen custom-fit header backpurging plugs. It's porous, non-hazardous, flame retardant, conforms to curves, leaves no glue residue, and it's dirt cheap. Another benefit is that if you have a weld where it would be difficult or impossible to remove the baffle afterward just flush the tubing with water and the bread will disintegrate and be harmlessly flushed away. Chore-Boy brand stainless scouring pads work well as dams too. Under $2 at almost any supermarket. Pads

    My backpurging hose is regular inert gas line with a short piece of steel fuel line press fit onto the end. I use a Harris 356 twin regulator with two independent flowmeters (one for torch, one for purge) but some people just use a Y fitting and up their flow rate slightly to compensate for purging losses.

    If you want a real backpurging dam, look at picture on the bottom left of page 40 and copy the design when you have some spare time to goof around.http://www.millerwelds.com/resources...Book_Chpt4.pdf
    With or without garlic and butter? Sorry, I couldn't resist. Very good idea, however!
    Last edited by davedarragh; 12-26-2008, 12:36 PM.

    Leave a comment:


  • MR.57
    replied
    One loaf of french bread will make about a dozen custom-fit header backpurging plugs. It's porous, non-hazardous, flame retardant, conforms to curves, leaves no glue residue, and it's dirt cheap. Another benefit is that if you have a weld where it would be difficult or impossible to remove the baffle afterward just flush the tubing with water and the bread will disintegrate and be harmlessly flushed away. Chore-Boy brand stainless scouring pads work well as dams too. Under $2 at almost any supermarket. Pads

    My backpurging hose is regular inert gas line with a short piece of steel fuel line press fit onto the end. I use a Harris 356 twin regulator with two independent flowmeters (one for torch, one for purge) but some people just use a Y fitting and up their flow rate slightly to compensate for purging losses.

    If you want a real backpurging dam, look at picture on the bottom left of page 40 and copy the design when you have some spare time to goof around.http://www.millerwelds.com/resources...Book_Chpt4.pdf

    Leave a comment:


  • Bert
    replied
    Originally posted by KB Fabrications View Post
    That's really all you need. Argon so readily displaces atmosphere that setting up a purge is not difficult at all. In fact, You don't want any kind of airtight seal as it would negate the positive pressure that a little "leaking" will provide. Lots of times I will just use a spring clamp to attach the argon hose inside a tube and then just tape around the whole thing. Blue painters tape works very well as it leaves no residue behind. Of course, that is dependent on how close you are to the seam but aluminum foil works equally as well.

    If you really are then this should be a no-brainer. If you really need to have some off the shelf products for your application and have plenty of cash, you might try a google search.

    http://www.cob-industries.com/argweld.htm
    WOW KB!! You hit the nail on the head with THAT link!! I thought it was $20 for a bunch, but when I went to the price list, I saw what you meant!!

    Leave a comment:


  • Bert
    replied
    Originally posted by KB Fabrications View Post
    That's really all you need. Argon so readily displaces atmosphere that setting up a purge is not difficult at all. In fact, You don't want any kind of airtight seal as it would negate the positive pressure that a little "leaking" will provide. Lots of times I will just use a spring clamp to attach the argon hose inside a tube and then just tape around the whole thing. Blue painters tape works very well as it leaves no residue behind. Of course, that is dependent on how close you are to the seam but aluminum foil works equally as well.

    If you really are then this should be a no-brainer. If you really need to have some off the shelf products for your application and have plenty of cash, you might try a google search.

    http://www.cob-industries.com/argweld.htm
    D@MN KB!! You hit the nail on the head with THAT link!! I thought it was $20 for a bunch, but when I went to the price list, I saw what you meant!!

    Leave a comment:


  • Bert
    replied
    Originally posted by KB Fabrications View Post
    That's really all you need. Argon so readily displaces atmosphere that setting up a purge is not difficult at all. In fact, You don't want any kind of airtight seal as it would negate the positive pressure that a little "leaking" will provide. Lots of times I will just use a spring clamp to attach the argon hose inside a tube and then just tape around the whole thing. Blue painters tape works very well as it leaves no residue behind. Of course, that is dependent on how close you are to the seam but aluminum foil works equally as well.

    If you really are then this should be a no-brainer. If you really need to have some off the shelf products for your application and have plenty of cash, you might try a google search.

    http://www.cob-industries.com/argweld.htm
    D@MN KB!! You hit the nail on the head with THAT link!! I thought it was $20 for a bunch, but when I went to the price list, I saw what you mean!!

    Leave a comment:


  • Laiky
    replied
    Lets see,

    Speed tape

    heavy duty alluminum foil (use some safety wire to secure if necessary)

    Take some scrap pipe and pound annealed aluminum over the end to make a cap

    cap a piece of scrap pipe, grind a taper in it and tap it into the hole

    Find a machine shop

    fiberglass cloth

    steel wool?

    If the hose is melting shove a piece of soft copper in it and bend the copper into a hook.

    As a Fabricator, this is really something you should make to suit your needs. If you want to buy it your certainly entitled but its something like a chef ordering out. Hope you don't take that the wrong way!

    Leave a comment:


  • enlpck
    replied
    Of course, I SHOULD mention that pretty much all I use is aluminum foil. Slap it over the end and squeeze. Then again, I don't have the need to purge very often. A length of brake line (I think its brake line... looks like brake line and the same size) on the end on the hose bends whatever way needed to hang the hose off the work, and is also heat resistant, and the foil squeezes over this as well as a plain end.

    Leave a comment:


  • KB Fabrications
    replied
    Originally posted by enlpck View Post
    Cut two sheet metal disks (22Ga or so) a little larger than OD of tube

    Notch edge in a dozen or so places to form tabs

    Bend tabs over to fit the OD of the tube

    (you can also notch and bend to fit ID)

    Drill hole in center of one disk for hose fitting.

    Stick one over each end of the tubing (if needed, squeeze a couple of the tabs tighter to hold in place, or use a hose clamp over the tabs) and turn on the gas.

    You don't need or want a tight fit... if there isn't the ability for some venting, pressure buildup will make closing up nearly impossible. If there is too much leakage, wrap (or stuff into the ends under the caps) some kaowool to cut it down.

    Low flow rates fed from the bottom are better (less mixing while purging)
    More good advice but the OP said he doesn't have the time to make anything. Anywho, commercial products like this are easy to find but you have to know what to type into a search engine.

    http://www.arc-zone.com/index.php?ma...x&cPath=10_616

    ROFLMAO, hold onto your wallet.

    Leave a comment:


  • enlpck
    replied
    Cut two sheet metal disks (22Ga or so) a little larger than OD of tube

    Notch edge in a dozen or so places to form tabs

    Bend tabs over to fit the OD of the tube

    (you can also notch and bend to fit ID)

    Drill hole in center of one disk for hose fitting.

    Stick one over each end of the tubing (if needed, squeeze a couple of the tabs tighter to hold in place, or use a hose clamp over the tabs) and turn on the gas.

    You don't need or want a tight fit... if there isn't the ability for some venting, pressure buildup will make closing up nearly impossible. If there is too much leakage, wrap (or stuff into the ends under the caps) some kaowool to cut it down.

    Low flow rates fed from the bottom are better (less mixing while purging)

    Leave a comment:


  • Teglove2
    replied
    thx for the quick replys fellas but nothing that was said can help me...the tubing gets VERY HOT and I cannot use any sort of tape I need metal plugs with holes I saw a guy on a honda forum that builds manifolds and he had a billet plug and thats what I need but in 3 sizes like stated above. Tape is also too weak and when I put the argon line in the tape the weight of the line itself tears the tape and leaves a nasty residue thats very hard to get off.

    Leave a comment:

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