Welding question

[Brian Ski]

I am trying to fill in a threaded section on a tube. Picture a 6" piece of steel pipe. 14mm threaded hole on 1 end and a 3/8" hole on the other. I want to fill in the 14mm hole so I can drill and re tap it 1/2". But I do not want to fill the whole pipe in.

I was thinking putting a piece of 3/8" brass or aluminum in the end to keep the weld from filling in. Thinking the weld won't stick to a non ferrous metal. BTW the pipe is steel.

Other ideas???

[fdcmiami]

I am trying to fill in a threaded section on a tube. Picture a 6" piece of steel pipe. 14mm threaded hole on 1 end and a 3/8" hole on the other. I want to fill in the 14mm hole so I can drill and re tap it 1/2". But I do not want to fill the whole pipe in.

I was thinking putting a piece of 3/8" brass or aluminum in the end to keep the weld from filling in. Thinking the weld won't stick to a non ferrous metal. BTW the pipe is steel.

Other ideas???

when you talk pipe you should give the schedule and size. when i first saw the six inch i thought it must be six inch pipe of unknown schedule; not length. it appears the ends are capped but who knows. you could take a bolt that fits the 14 mm hole insert/cut, weld perimeter, center punch and redrill.

or you could tap for 5/8ths unc/unf

[fdcmiami]

there is also a difference between tube and pipe; two different animals. so now i am thinking this is a piece of tube that has an id on one that accepted a 14 mm tap but wait. what about the other end? it's only 3/8ths. hmmm how does that work. oh, maybe the holes are not on the end but on the body of the tube/pipe itself. hmmm put a camera on next years christmas list.

signed.
grinch

[zedron]

I am trying to fill in a threaded section on a tube. Picture a 6" piece of steel pipe. 14mm threaded hole on 1 end and a 3/8" hole on the other. I want to fill in the 14mm hole so I can drill and re tap it 1/2". But I do not want to fill the whole pipe in.

I was thinking putting a piece of 3/8" brass or aluminum in the end to keep the weld from filling in. Thinking the weld won't stick to a non ferrous metal. BTW the pipe is steel.

Other ideas???

I have only done something like this teh other way around. I had to fill a threaded piece of AL. The other difference was that my piece was only 9 inches long of 5/16 thick 1.5" pipe. I used a piece of steel to help with the fill.

[Rambozo]

there is also a difference between tube and pipe; two different animals. so now i am thinking this is a piece of tube that has an id on one that accepted a 14 mm tap but wait. what about the other end? it's only 3/8ths. hmmm how does that work. oh, maybe the holes are not on the end but on the body of the tube/pipe itself. hmmm put a camera on next years christmas list.

signed.
grinch

I agree, I have no idea what you are talking about. But weld will not stick to copper or thick aluminum so you can use them for a backing.

[Brian Ski]

when you talk pipe you should give the schedule and size. when i first saw the six inch i thought it must be six inch pipe of unknown schedule; not length. it appears the ends are capped but who knows. you could take a bolt that fits the 14 mm hole insert/cut, weld perimeter, center punch and redrill.

or you could tap for 5/8ths unc/unf

Sorry... Trying to run the question up the flag pole before work so I was in a hurry. This part is like a hollow, short, metal, table leg.

I guess the best way to describe without a picture is a piece of 1/2" id steel pipe about 6" long. (similar to galvanized water pipe.) I think it is about a 1" od. Wall thickness is about 1/8". Got a taper to it so the non threaded end is about 3/8" id.

Good idea of using a bolt except this is a 14 mm with a left handed. I want to get rid of the bastard size and convert it over to 1/2".

I guess I could just hit the end with the mig welder and fill it in, but was looking for something that would give it a better flatter weld on the inside. Instead of gobs of weld.

[cbmkr]

Get a heavier grade 8 flat washer 1/4" or 5/16" size weld it to the end of the pipe trim off the excess and re thread it to the size you want.