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Tractor Talk Discussion Forum

O/T cutting and welding two pipes

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SDE

01-02-2008 16:14:59




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I am trying to make something for my 3point hitch. I need to cut a 3.5 inch pipe so that it can be welded to form a tee with another 3.5 inch pipe. How do you lay out the line, so that it will fit tight enough together so that I can weld it all the way around the edge?

Can this be laid out on a Cad-Cam system?

Thank You
Steve




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SDE

01-03-2008 15:51:47




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Thank you everyone. I finished the first joint today. It was not as tough to do as I had thought it would be. I made a paper pattern from it and will use that for the second joint.

SDE



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David in Missouri

01-03-2008 09:55:25




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
I'd get a flat piece of cardboard, like the kind on the back of school paper pads, form it around the pipe and cut it to match with a pair of scissors. Then lay-out the pipe with this template and saw/grind to suit. I've done this with smaller diameter tubes for aircraft fuselages.



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Kansas Cockshutt

01-03-2008 07:26:45




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Go by the local welding shop and have them draw a nice saddle with a chalk. Make sure you cut a nice bevel in it so you get a sturdy weld. If you are not an experienced welder then maybe you should just have them turn it out really quick- you might not be the one using it in a few years. Like others said you can buy templates but after you do it enough it should be second nature for something like this? If you are fitting pipe they make tools to do it exactly but this is just basic fab...

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TomTex

01-03-2008 05:50:09




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Never heard so much rambling and fussing over something I do all the time. Every fence stretch around has pipes welded in H paterns all over the county. I bought one 2 3/8 inch and one 2 7/8 ready made jigs, that hinge open, slip on the pipe, close jig, mark around the edge, remove jig, cut with torch, trim up for good fit with 4 1/2 inch angle grinder, and weld. The fit is so good that a match stick cannot be inserted into any of the small cracks. Every welding shop in Texas has these jigs for making these near-perfect fit of two pipes at 90 degrees and 45 degrees, and 30 degrees. Tom

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135 Fan

01-03-2008 11:55:05




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 Re: O/T cutting and welding two pipes in reply to TomTex, 01-03-2008 05:50:09  
I agree. I was building roll cages and bought a couple pipemasters. They work for any kind of joint you need to make. Look on the web. Dave



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RobMD

01-02-2008 20:05:24




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
A hole saw and a drill press is perfect.



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Blue guy

01-02-2008 19:54:40




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Maybe this will help you?



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37 chief

01-02-2008 18:38:04




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Make sure you cut the pipe to be notched about a foot longer than needed. When you make a lot of cuts to get the correct notch you will probably be just about the right length. stan



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VACLee

01-02-2008 18:35:28




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
If you have a band saw it is very easy. Can be done with abrasive saw also but will not be quite as accurate. Start with a square end. Mark the center of the pipe. Cut from that point on a 45 degree angle in a manner that cuts half of the pipe. Rotate the pipe 180 degrees and repeat. Pipe should have a point at this time that is tapered back 45 degrees on either side. When you place it against the other pipe you may have to do a little grinding if you did not rotate exactly 180 degrees. If you don't understand I can email a drawing. I don't know how to post one. HTH

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Armand Tatro

01-02-2008 17:36:25




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
There should be a piece of channel-iron that the 31/2" pipe will lay in thus giving a nice square edge to weld to. This channel would be welded to the the center of the top of the T than the leg welded to the center of the flat(web) of the channel. Any questions? Armand



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ericlb

01-02-2008 16:58:16




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
billy ny, hit it right on, follow his instructions grind to fit and you'll be fine, if a straight "t" is critical, weld a little on each side alternate, to avoid the heat from the weld "pulling" the joint out of square



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SDE

01-02-2008 16:51:32




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Thank you for the quick reponses.
Square stock, that was the conclusion I came to after I had already started. And it is probably the right thing to do, BUT, just like you, I hate to give in or give up.

I think I have a 3 inch hole saw. I will give it a try.

If all else fails, I will resort to the angle grinder. See ya next month. LOL

SDE



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Allan In NE

01-02-2008 16:36:51




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Okay,

This is kinda "insider information" and a real top notch "trade secret" with me, but I do feel that just in this one instance, I really should share this closely guarded bit of info with you just to make yer life easier.

DUMP THE PIPE AND USE SQUARE STOCK. :>)

Allan



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Mattlt

01-02-2008 16:52:02




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 Re: O/T cutting and welding two pipes in reply to Allan In NE, 01-02-2008 16:36:51  
I tend to agree with Allan, but maybe you could practice on a piece of PVC of the same diameter? Maybe even a rolled up piece of cardboard? Quite a bit cheaper to play with.



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Bus Driver

01-02-2008 16:31:31




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
There are jigs that use hole saws to cut matching shape in the end of one pipe. For just one, rough cut the shape with a torch or grinder and fill the gap by multiple welding passes. "This is a welder, not a caulking gun".



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Billy NY

01-02-2008 16:28:37




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
Could'nt you take the end of one pipe, place it on one side of the one to be cut, place it so the radius is deep enough into the pipe to be cut, mark it, do the same to the other side, making it even with the first on you marked out, as long as you cut it true, it ought to be a tight joint, maybe you'll grind it a little so you have some kind of bevel, if necessary, increases the surface contact area of the weld, but more common on a butt joint, not a tee I suppose, just thinking aloud here.

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bva

01-02-2008 16:22:45




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 Re: O/T cutting and welding two pipes in reply to SDE, 01-02-2008 16:14:59  
if you have a 3 1/2" or even 3" hole saw, just cut the pipe with the hole saw. The 3 1/2" will cut the entire diameter of your pipe and look/fit real good. The 3" will not cut the entire diameter but will do most, fit good and look ok after weldin. just one way to do it.



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SDE

01-02-2008 17:13:07




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 Re: O/T cutting and welding two pipes in reply to bva, 01-02-2008 16:22:45  
I had intended to go out to the garage tonight, but I see that it is now 7 below. Tomorrow is the blood mobile so maybe I will try something this weekend.
Good night and Happy New year.
SDE



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