What is the appropriate welding type for steel pipes?, and more couple of questions

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Hello everyone,I'm working on tank drainage project and I have to know some information regarding steel pipes welding, so I really need your help guys  These are the information you might need to know:*the tank is made out of steel*the pipes are all made out of steel with the following specifications:(A)          2-1/2" SCH 40 (2.875 OD X .203 wall)(B)          2" SCH 40 (2.375 OD X .154 wall)(C)          1-1/2" SCH 40 (1.90 OD X .145 wall)My questions are:1-What is the appropriate welding type for the steel pipes?2-What is the average cost of welding per hour?3- How much time would it take to weld each pipe of those mentioned above?Thank you so much !!
Reply:What kind of purpose is the pipe being used for? What kind of steel? What pressures? Inspected?  Those are important questions in determining the process used for the weld, especially the first two.
Reply:No clue on the time or cost but my vote on it is if it is indoors and easily positional, .035-.045 er70s-6 with 90/10 argon co2, or dual shield and co2...TOOLS AND TOYSSMAW Mid States Inc. "MISSING LINK" 10-150 AMP Buzzer circa 1945ishSMAW Magic Wand 40-60 AMP Suitcase Buzzer circa 1939ishGMAW Hobart 210 IronmanOxy-Propane TorchMany other old and cold goodies"Rusty but Trusty"
Reply:DeuceTrinal & MISSING LINK thank you for replying.I'm only looking for some general information regarding the welding type such as SMAW, GMAW, SAW,...etcHowever, the pipes are only used for flushing a water tank with a diameter of 10 m and a height of 12 m.The pressure is 17.073 psi-gage and the steel is "A500 ERW Structural Steel Pipe"I'm an undergraduate mechanical engineering student and the project is for fluid mechanics course, so it would be too detailed if I mention such specific information about the welding since it's not the primary goal of the project . Sorry for not mentioning that earlier
Reply:The height of 12m and 17psi seem correct..about half a psi per foot. 17psi is very low. You could epoxy it and it would hold!I'd use whatever process you have available. I'd tend towards stick and tig, but that's what I'm most comfortable with. The stick will be a bit uncomfortable if you can't weld the pipe on before erecting the tank (IE: if it enters horizontally, you'd have a overhead portion to deal with...no big deal, just need some leathers).No idea on the cost because I do my own work. Probably about 1 hour per weld though (Including setup, prep and cleanup) to do a high quality job. Chay
Reply:that small and thin of a pipe is best welded with TIG.
Reply:Good grief man, that size CS pipe is stick welded a couple million times per day, outside.Good luck using tig or as others suggest mig, out in the mountains with a 25 mph breeze. Do you people actually weld pipe? Where?The original poster is lookin' for somebody to do his homework. And admits it : )Why are they asking you questions in a course, on information that hasn't been covered in the course?Your question is way too broad, and doesn't contain enough detail for anybody to give you real world estimates. Even people who bid pipe work every week.Your grammer also makes me thinks you are not in the U.S. Good luck with the work.JT
Reply:Thanks miller300a, that's more than enough to me
Reply:welding stuff are new to me and what I wanted to know is some general information about welding.the welding part is nothing but a tiny side task which I couldn't find an answer for in the internet, so STOP JUDGING PEOPLE ALREADY!!!
Reply:Originally Posted by big worldwelding stuff are new to me and what I wanted to know is some general information about welding.the welding part is nothing but a tiny side task which I couldn't find an answer for in the internet, so STOP JUDGING PEOPLE ALREADY!!!
Reply:Originally Posted by JTMcCGood grief man, that size CS pipe is stick welded a couple million times per day, outside.Good luck using tig or as others suggest mig, out in the mountains with a 25 mph breeze. Do you people actually weld pipe? Where?The original poster is lookin' for somebody to do his homework. And admits it : )Why are they asking you questions in a course, on information that hasn't been covered in the course?Your question is way too broad, and doesn't contain enough detail for anybody to give you real world estimates. Even people who bid pipe work every week.Your grammer also makes me thinks you are not in the U.S. Good luck with the work.JT
Reply:Originally Posted by TimmyTIGI've welded pipe all over the country with TIG, from 80 miles out in the Gulf of Mexico all the way to Prudhoe Bay, Alaska.  Ain't no thing to weld TIG in the wind, put up a wind block and jack your argon up, piece of cake.
Reply:You bid pipe work by weld inches a 2" weld is worth about 7-1/2" and a typical inches per hour is anywhere from 10-20. That will cover your prep work and cutting etc. I can make a 2" weld pass X-ray in about 15 minutes w/smaw but it's not just weld time that's important. I have made as many as 30-2" welds in a day in which case you are making money. But on average 10" per hour for less confidence and more margin. Hope that makes sense
Reply:Originally Posted by JTMcCPiece of cake. We've tig'd quite a bit of pipe as well, when necessary.Do you have water tank owners lined up wanting to pay you to tig a 2" 90 on the bottom of their rusted tank?That's about the most inneficient welding thought I've heard in a while.Do you bid work? You bid rusty CS water line with tig in the field? That's a recipie for starvation.JTMcCHave you ever paid for a dewar??There are applications for tig root on CS, it's not on an atmosheric water tank.
Reply:just a side note. i spray arc 10 ga tube every day. most smaller than the pipe mentioned. stick is great too. just got done burning a bunch now on some structural work... fact is when i do water tight work i grab my mig... tig is great too.... nothing as purdy as a nice 3\16 spray fillet weld on small pipe. as for those that say you can't TIG or MIG in the wind, you gave to quickly. its all in your setup man. Just my $0.02Last edited by MISSING LINK; 05-02-2014 at 11:36 PM.
Reply:Originally Posted by riflecoBut on average 10" per hour for less confidence and more margin. Hope that makes sense
Reply:Yes 10" of weld. Figured as Pi x D multiple passes do not count until you get into thicker wall thicknesses. So even though you should have 3 passes on 2" pipe you only get to count once.
Reply:Originally Posted by riflecoYes 10" of weld. Figured as Pi x D multiple passes do not count until you get into thicker wall thicknesses. So even though you should have 3 passes on 2" pipe you only get to count once.
Reply:Originally Posted by TimmyTIGWow, do you practice at being a dick or does it just come natural?
Reply:Originally Posted by JTMcCSerously, have you ever paid for a dewar? JTMcC
Reply:
Reply:I've drank a bit of Dewars, paid for it as well.   Last edited by storeman; 05-06-2014 at 08:34 PM.30+ yrs Army Infantry & Field Artillery, 25 yrs agoMiller 350LX Tig Runner TA 210, spool gunLincoln 250/250 IdealArcESAB PCM 500i PlasmaKazoo 30"  vert BSKazoo 9x16 horiz BSClausing 12x24 lathe20T Air Press
Reply:Originally Posted by JTMcCThere's nothing but (to me, based on experience) hard bid facts in that post.If you want to counter my facts, then go for it.But calling me a dick, with no real world numbers to back it up just sounds like you got your little feeling hurt, by the facts.Serously, have you ever paid for a dewar? have YOU ever paid the freight to weld tig weld pipe that's faster/cheaper/better welded with another process?Feel free man to dispute ANYTHING I say. Bring it, and back it up with real numbers. I look forward to the exchange, I have tig numbers in hand. I've put a stopwatch to everything we've built over the last 22 years and before that I was "practicing" to quote as an employee. And I've added/recorded the cost's on every job we've done.Are you an employee or do you have personal responsibility for the decisions made? Like I said, dispute anything I say, but put some facts behind it. Your stupid little personal attack just tells the world that...you are out of ammo and can't post a real reply.JTMcC
Reply:Originally Posted by JTMcCThere's nothing but (to me, based on experience) hard bid facts in that post.If you want to counter my facts, then go for it.But calling me a dick, with no real world numbers to back it up just sounds like you got your little feeling hurt, by the facts.Serously, have you ever paid for a dewar? have YOU ever paid the freight to weld tig weld pipe that's faster/cheaper/better welded with another process?Feel free man to dispute ANYTHING I say. Bring it, and back it up with real numbers. I look forward to the exchange, I have tig numbers in hand. I've put a stopwatch to everything we've built over the last 22 years and before that I was "practicing" to quote as an employee. And I've added/recorded the cost's on every job we've done.Are you an employee or do you have personal responsibility for the decisions made? Like I said, dispute anything I say, but put some facts behind it. Your stupid little personal attack just tells the world that...you are out of ammo and can't post a real reply.JTMcC
Reply:Originally Posted by TimmyTIG I bow to your superior bean counting ability. but you do have a pretty abrasive posting style.So JTMcC, what do you use a dewar for in welding?? Ive used them to keep coffee hot and LN 2 cold (liquid Nitrogen) but what is it used for in welding? Drying pipe?Just in case somebody doesnt know ;  a dewar is  a thermos.http://www.2spi.com/catalog/instrume...gen-dewars.php
Reply:I've drank dewars, but I'm not a fan of the blends. A really nice single malt is my first choice.Regards,RobGreat Basin WeldingInstagramBlue weldersRed weldersMy luscious Table DIY TIG Torch cooler
Reply:Originally Posted by InsanerideSo JTMcC, what do you use a dewar for in welding?? Ive used them to keep coffee hot and LN 2 cold (liquid Nitrogen) but what is it used for in welding? Drying pipe?Just in case somebody doesnt know ;  a dewar is  a thermos.http://www.2spi.com/catalog/instrume...gen-dewars.php
Reply:Originally Posted by 7A749Awwww..I knew you had a heart John
Reply:Originally Posted by JTMcCLiquid argon. It's a lot cheaper way to buy if you need large amounts.Argon has gotten pretty expensive.JAnd for coffee too.