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welding pipe question

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Willy P

01-05-2008 19:04:05




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I am building a hay barn and using 2 3/8 pipe and cutting sadles to put them together and welding them together with 7018 rods,but my question is how many passes do I need to weld on the joint? The young man doing the welding has only put one good weld around it and I am not sure that is enough,the joints fit tight so is one pass enough? Thanks




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trucker40

01-07-2008 12:51:47




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
Its possible to weld it with one pass if he is a good welder with 7018.If you would rather it had more weld on it,put some more on it.It needs to have as much weld as the pipe is thick.So if the pipe is 1/4 in thick,it needs 1/4 in of weld,with no problems in the weld.I think I would ask if he would weld it with 6011 if it looked bad to me.Where 6011 is not as strong as 7018,its hard to break a 6011 weld because it digs in real good.I read on here,I think,that 6010 is even better.7018 is not a real deep penetrating rod,but it works,and has more tensile strength.

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Willy P

01-06-2008 19:10:38




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
thanks for all the good advice,I think that I know what ya'll mean about getting enough weld on each of the pipes or on each side of the joint,oh I better hush, now I getting myself confused. Thanks



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T_Bone

01-06-2008 17:10:07




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
Hi Willy,

What AWS codes says on fillet welds, is the leg of a weldment is equal in length to thinnest part of the base metal.

Example:

If our base metal is 1/4" thick then each leg length shall be 1/4".

If one piece of the base metal is 1/4" thick and another joining piece is 1/8" thick then each leg would be 1/8" long minimum.

Define weld Leg: On a right angle, the distance from the web to the toe of the weld.

Define weld Toe: The point at which the weld joins the base metal.

Define weld Face: The surface of a weld between each toe of the weldment.

Alot of weldors think the "weld face" is the most important part when in fact it's the leg that does all the work. The face just looks pretty. Sound like were talking about something else doesn't it!!!
This will also apply too pipe weldments as your have several differnt type of joints to weld.
It's not only the correct amount of filler metal added, but joint prep, root opening, joint fit up and weldor ability that is more of a concern than applying too much weld to cover up a crappie weld. Not every weld can be 100% each and every time and that's why they make grinders.

Like has been said, it all depends on the weldors ability. I would most likely burn one pass on most of the weldments as I can cary a very large weld puddle on pipe. Some weldors do well just to bird $hit one pass and need several passes to accomplish the same.

A photo tho would take out all the guess work :)

T_Bone

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Fitter Roger

01-06-2008 14:12:11




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
http://www.saturnfans.com/photos/showphoto.php/photo/18094/size/big/cat/500/ppuser/458

I hope that photo page shows up. It is a 6 inch chunk of pipe welded overhead, cut into strips a 10, 2, 4, and 8 o"clock positions. It was a passed test with now defects.

Welding rod was 6010 5p+ rod 3/32 dia for the root pass and hot pass and 1/8 th inch 7018 burned in cover pass. The pipe wasw beveled ath the joint and a 3/32 land.

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Fitter Roger

01-06-2008 14:15:55




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 Re: welding pipe question in reply to Fitter Roger, 01-06-2008 14:12:11  
Click on the URL at the bottom of my other post to see a weld destruct test on pipe and you can look at my othe photos in that gallery. It's me taking my weld test, my dogs and my old city house.

I am a Journeyman Pipefitter by trade.

Roger



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Weldin man

01-06-2008 13:27:07




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
A good rule of thumb is the weld bead at the the center of the weld should be at least 75% of the original thickness being welded. If he is running 3/32 electrode, I seriously doubt you are getting enough build up and I also doubt if you could run l/8in and carry enough amperage on that size pipe to weld it properly. Myself I'd run at least 2 passes with 3/32. A big bead is not always stronger than a litle one,if you don't have the proper penetration.As Old said, when welding High pressure piping, we always ran 3 passes- A Root-Filler -Cover, but your application is strictly structural and doesn't need to hold a liquid.

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135 Fan

01-06-2008 11:58:57




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
If there is a decent fit up and the weld looks OK with fusion on both pieces, one pass should be plenty strong enough with 7018. If the welder can burn the 7018 fairly easy, he most likely knows what he's doing. Dave



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old

01-05-2008 21:39:34




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
As per a pipe line welder I knew heres the right and best way. He was also an instructor. Weld one pass, chip the slag off and clean up any bad spots. Then weld another pass, chip and clean. Then make a 3rd pass. Any more or any less does no good or makes it stronger or weaker. Or in other words 3 is magic more or less is just a waste of time

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Dick L

01-06-2008 07:39:59




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 Re: welding pipe question in reply to old, 01-05-2008 21:39:34  
Old, what you said most likely is the way it is normally done in the field. I was trained by Sohio in the early 1960's and to pass the pipe line test I had to weld in two passes and then the weld was destroyed by cutting and breaking. I was not put to work on pipe line welding. I went to a plant to weld up to 5000 pound hydraulic pipe lines.



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Dick L

01-05-2008 20:11:08




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
If the guy welding the pipe has placed a bare rod end under the saddle to leave a gap between the two pieces the width of the rod you are using, one pass should be enough. That was how I was instructed to weld high pressure pipe. We had to weld and then cut the welds to prove we had weld all the way under the saddles and not just on the outside. Large diameter thick wall pipe had to have two passes. The first pass had to be high on the inside of the pipe and the second pass had to be above on the outside the same amount. That probly is not critical in your job but it sure wouldn't hurt.

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elifish

01-05-2008 20:07:22




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
I believe all you asked is if one pass is enough? Yes as long as your weld is solid and the same or more thickness of your pipe and centered penetrating each pipe equally with no undercut.



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Puddles

01-05-2008 19:33:03




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
If you’re talking 2-inch extra strong pipe with a 1/4-inch wall thickness, and welding up hill a single pass with 1/8-7018 or 5/32-inch 6010 should be sufficient. Different weldors can carry different amounts of weld puddle.



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railhead

01-05-2008 19:29:27




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 Re: welding pipe question in reply to Willy P, 01-05-2008 19:04:05  
I have welded a bunch of 2 3/8 pipe for coral, fence and buildings. Cut your saddles with chop saw set at just under 30 deg angle. then turn the pipe 180 and cut the other sliver off. this makes good saddles, much better than you will ever do with a torch. I always use 6011 or 6010 rod. You can OF COURSE use 7018 if you are a good welder but for the out of position welds you are going to have to make you can do it with less passes and faster setting welds. 60K psi opposed to 70K psi is never going to factor into the strength of your building. Both are more than your pipe. If you fit it good and take your time, you should be able to weld it solid with one pass. Just my experience and .02

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