i want to learn to weld...

[GHarman]

Constant o.d

Jason, I may have read you wrong. However, IPS (Iron Pipe Size) O. D. must be constant for a threader to work on the various wall thicknesses. Example; 2" Schedule 40, 80, 120. They are the same O. D. . The wall thickness changes, therefore the I. D. . GregH

 

[GiesJ]

Greg -

perhaps we are talking about two different things - IPS and NPS?



I have never worked with threaded connections so perhaps there is a difference but after your post I checked my pipe chart. According to the chart, referencing ANSI B36. 10 and B36. 19 (for carbon and stainless steel pipe, respectivley) from 1/8" to 30" pipe, OD is always fixed with ID (and wall) varring.



I'll dig around online tonight. Sorry if my last post came across wrong.



PS - I'm back in WYO so maybe we'll have to have a beer sometime?

 

[GHarman]

Greg -

perhaps we are talking about two different things - IPS and NPS?



I have never worked with threaded connections so perhaps there is a difference but after your post I checked my pipe chart. According to the chart, referencing ANSI B36. 10 and B36. 19 (for carbon and stainless steel pipe, respectivley) from 1/8" to 30" pipe, OD is always fixed with ID (and wall) varring.



I'll dig around online tonight. Sorry if my last post came across wrong.



PS - I'm back in WYO so maybe we'll have to have a beer sometime?

Jason, Let me know when you can come to the Denver area. Can meet you on the North side, close to I-25. How about Coffee, insteadOo. . GregH

 

[GiesJ]

Coffee sounds good, Greg. I'll shoot you a note sometime soon. Still trying to get settled back home.

 

[DJW]

GHarman, yes GregH that's what I was told when starting to work in the USA, to facilitate threading. But I understand all pipe for threading is referred to as NPS, plus plain or beveled end for welding. Size Sch. denotes thickness, not sure of pressure. Where pipe has a welded seam, Tube in Britain when referring to steel, is solid drawn, (seamless) starts out as solid block, whereas pipe flat bar. The size of a tube referred is the O. D. as was first used in Boilers, and being fitted into a Tube (Plate) Br. (Sheet) Am. the OD was the size referred to. In Britain to drill and tap a hole in steel, a different size hole was drilled depending if coarse or fine thread. For Aluminum, (Aluminium) a different thread, also Brass, etc. Had to be a walking Encyclopedia. (Americans make Life so Easy, I've often wondered Why?) During the War they had Nuts and Bolts with Unified threads for coarse thread nuts and bolts, so that they could be used by American and British. The nuts would have to be tightened all the way with a wrench, as were too stiff to spin down by hand, as the threads were cut to accommodate American and British thread angles. (Did I tell you I knew Everything?) When I first asked for a 1/2 inch wrench at the toolroom in the USA, on being handed to me I said that's the wrong size it's too small, I asked for half inch. Got a funny look was told to read size on wrench. In Britain those days, a wrench was sized by the bolt, not across the flats of the nut, (Elementary my Dear Watson) and depending if a coarse or fine thread, (are you still following me?) The wrench would read, say, 1/4 BSF (British standard Fine) and say, 5/16 W. Whitworth (now makes it much easier don't it?) Not to leave you slightly confused, there were many other threads for different purposes, depending if pipe and material, (almost forgot) there were sizes and threads used exclusively by the Bicycle Industry, (so, just any old bolt will do Buster) plus different everything from different companies. Not forgetting an Englishman, (I'm not, or even was) does not wish to converse with a person to whom he has not been Formally Introduced. (So There!) After All, Such is Life. We Will Survive, (Hopefully)

 

[GHarman]

DJW, I have an old SAE wrench. The fractional dimension stamped on the wrench ends tells you what size nut or bolt it is for, not the dimension across the flats of a bolt or nut. It was part of my Dads old tool kit that he used when he went to Auto Mechanics school in Tennessee, back in 1930's.

The fit of a thread is divided into classes 1,2,3,4 etc. Sounds like the wrench 'em all the way type nut/bolts you mentioned would be a class 4 fit.

I know a lot about alot of things. That knowledge and $2. 01 US will get me a cup of coffee at Starbucks:-laf.

Now, the BIG challenge is to pass on some training to my Son:--). He wants to be Train Engineer, However he doesnt like school work. How do you instill the necessity of learning into an 8 year old who knows it all:-laf? GregH

 

[DJW]

GHarman,, frankly I hated school, far too much discipline, however even leaving school at 14 years of age, my eldest son, an honor student in the 70s, on looking at his text book I was sadly disappointed, on his graduation at 18 years of age, I could have blown his socks off in English, American and Metric. I never mentioned our sons' standard of education, my wife also only went to elementary school and left at 14 years of age, normal in Europe at that time, on coming home from work each day, I was told of her concern of their education, I'd tell her, they were born in this country, educated to this country and probably will work in this country, so not to bother. I never interfered with our sons' schooling, had four sons, all working, two licenced general building contractors, two dropped out, the second took a test and was qualified to leave, told me he wasn't learning much and though it a waste of time to continue. I never did have ambitions, only work. Even today, in this screwed up World (according to some), a British School Teacher carries the same stature as a Judge, Lawyer, Banker, Doctor, Professional anything, for his or hers signature to a government Document, Document signed in a foreign country (how about that?). Sadly in the USA and even Canada, school teachers are not highly regarded. If going home from school, and complained to your mother that your teacher was not kind to you, you received likewise from your mother, (therefore a double dose, she had also attended school) Don't Cry on My Apron.

 

[GiesJ]

Greg - I just re-read some posts and you and I were saying the same thing.

Pipe OD is the same within each pipe size regardless of schedule.

Sorry if that got a bit confusing. Maybe it's the altitude...

 

[GHarman]

Greg - I just re-read some posts and you and I were saying the same thing.

Pipe OD is the same within each pipe size regardless of schedule.

Sorry if that got a bit confusing. Maybe it's the altitude...

No Doubt:-laf. GregH

 

[DJW]

GHarman, thanks for message, did reply but for some reason couldn't post, did try a few times but failed, perhaps some error on my part. Been looking at Plasma arc machines, I did have a plasma fitted to a profile machine, worked very well, the first profile I worked at 15 years of age was a BOC, (British Oxygen Company) burning shapes with oxy-acy, cut your and shape templates, interesting work.

 

[GHarman]

GHarman, thanks for message, did reply but for some reason couldn't post, did try a few times but failed, perhaps some error on my part. Been looking at Plasma arc machines, I did have a plasma fitted to a profile machine, worked very well, the first profile I worked at 15 years of age was a BOC, (British Oxygen Company) burning shapes with oxy-acy, cut your and shape templates, interesting work.

DJW, Sorry, I did not receive any replys? I thought you "was" mad at me:-laf.



I personally liked Thermal Dynamics Plasma power supplies. Used 'em quite a bit. However, I no nothing about what is available today. GregH

 

[DValentine]

TH, how is the welding going? Haven't heard from you, on here, for a while. Getting the overhead ok? They say it's just like welding flat.

 

[JWelch]

Any of ya'll weld any Inconel?



I was up till two wks ago when company's owner pulled the job from us because the boss totaled his Harley Davidson. Were getting our money because that is a break of contract in the state of OK. Plus there was not a completion date anywhere on the paper work. We also talked to our two represenatives for the company the next day and told them what was had happened. Doctor told him not to have his head down for extened periods of time.



These were header boxes from 5/8th wall to 1 1/4 thickness. It was interesting to weld this stuff.



They tried to get us to mig weld the stringer in there when the prints say to heli arc stringer and hot pass. Then we can use the FC on out. They even tried to put us next to a carbon griinding station. Cause we don't know what we were doing.



Now the AI knows and is p issed to say the least.

 

[GHarman]

JWelch, Good to hear from you. No, I have not welded Inconel. I have welded Monel. If its anything like Monel, it is a dirty weld. It forms a scale when over heated and requires a matching filler metal using the GTAW Process. There may be SMAW rod or GMAW wire rolls available? That is beyond my experience. Follow the procedure as outlined. Do not deviate. The QA/QC department or the welding engineer should have the procedures available. The CWI will (if he has been given the authority) enforce the procedures. I know this does not answer your question specifically, but, stand your ground. GregH

 

[JWelch]

Greg, Sorry been away for awhile. Workin/Livin in Oklahoma. My laptop was stolen a few months ago so it has been hard to get on here.



We stood our ground and the weld engineers were/are on our side. The AI now knows about all of this is probably going to pull this places stamp. He has already gotten on to them about other code vialations costing into the 100,000s. They moved the job to another shop that said they could have job done in a week. Yeah right, especially when you consider when had all of the hard ones done for em. He is not certified/qualified to this work. He has welded on Inconel pipe but header boxes are very different.



Im not sure if monel is similar to inconel. I know it can take a whole bunch a heat. Up to 300 amps if necessary thats when I start using a WP-26 fixed head.

 

[GHarman]

New material

I received these coupons from my Friend who is a CWI/QA/QC. I did not weld these! Just some examples of pipe welding that was completed by Boilermakers, testing and process certification. Note the wall thickness. The carbon steel pipe is 1 1/2% Chrome Alloy. The WPS requires a GTAW root and 7018 SMAW fill and cap. I will try to post a few pictures.



Here is a coupon set for the "Turbine Vent". Note the bevel and the wall thickness! there is no land and the bore of the pipe has not been trued. GregH

 

[GHarman]

Here is another picture of the thicker walled coupons. The one on the right has the bore trued. GregH

 

[GHarman]

This is the best picture of the weld on the thinner walled pipe. Notice the stringer cover pass. Tie in your beads. An practical example of the importance of tieing in your beads. GregH

 

[GHarman]

Orbital tube weld

Here is an example of "Orbital Tube Welding" and joining "Dissimilar metals"! 347 Stainless Steel to 1 1/2% Chrome. Not a great picture. GregH

 

[DValentine]

Nice Greg. Two jobs that I know of using the orbital welding is one in Centrallia WA and the job in Pueblo CO. They are both the same contractor. I think we will see more of this type of welding on single tubes. It doesn't work so well on tubes that have membrane on them..... boiler water walls.

D