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Up Topic Welding Industry / Inspection & Qualification / Tubular Connection
- - By bmaas1 (***) Date 02-06-2009 15:12
If I welded a flange to the end of a pipe with just a fillet weld would that be considered a tubular connection or nontubular per D1.1?

Brian
Attachment: SKMBT_60009020623050.pdf (11k)
Parent - - By jwright650 (*****) Date 02-06-2009 15:19
See lower right corner of page 333 in AWS D1.1:2008 Annex K
Parent - - By bmaas1 (***) Date 02-06-2009 15:34
So then I would be correct in saying that this is a tubular connection?

Brian
Parent - By jwright650 (*****) Date 02-06-2009 15:42
Brian,
If the beam is a main member and the pipe is also a main member and they intersect, then I think it is considered a tubular connection, but then I don't really see your connection as shown in Figure 2.14(which is ref'd paragraph 2.21). I'm a little unsure, because at first glance, I thought it was, now I'm not so sure that it is.

Maybe kip will chime in here and help us figure this out for you.
Parent - - By jwright650 (*****) Date 02-06-2009 15:44
I didn't see your sketch before...what am I looking at there? Which member is which in your sketch?
Parent - - By bmaas1 (***) Date 02-06-2009 15:51
Sorry.  Not a good artist.  I have attached a revised sketch.  It is a pipe inserted into a plate flange and welded.
Attachment: SKMBT_60009020623330.pdf (24k)
Parent - - By jwright650 (*****) Date 02-06-2009 16:15
So this isn't a beam flange? It is a plate that is being welded on the pipe after the pipe has been fit halfway through the plate...acting like a pipe flange?
Parent - - By bmaas1 (***) Date 02-06-2009 16:20
Correct.
Parent - - By jwright650 (*****) Date 02-06-2009 16:41
Brian,
I discussed this with my engineer here and he and I have convinced each other that this is not considered a tubular connection per the definition on page 333. The plate is not a member, it is an accessory item to the tube(the main member).
Parent - - By bmaas1 (***) Date 02-06-2009 16:53
What about 2 assemblies bolted together?
Attachment: SKMBT_60009020700360.pdf (42k)
Parent - - By jwright650 (*****) Date 02-06-2009 17:02
I still think you are OK. Are you thinking about your WPS and welder quals due to tubular connections?
Parent - - By bmaas1 (***) Date 02-06-2009 17:04
That and inspection criteria per table 6.1.

Brian
Parent - - By jwright650 (*****) Date 02-06-2009 17:10
Until you get down to the undercut and porosity criteria in Table 6.1, it is basically the same stuff as what you are used to.
Parent - By bmaas1 (***) Date 02-06-2009 17:26
Correct.  I just want to make sure I am applying the correct criteria.

Brian
Parent - By ctacker (****) Date 02-06-2009 18:49 Edited 02-06-2009 20:31
so putting a base plate on a column is not a tubular connection but if the same column was welded on a beam (using it as an embedded base, (I have ran across this before)), it would be a tubular connection?

My next question,  welding a 2-1/4" dia.  boss (3/8" diameter at weld root) to a casting, ASME IX QW-452.3 has a diameter limit of 1"-2-7/8" so I would essentially need to weld a solid 1" to less than 2-7/8" round or a 2" pipe with a 1/2" wall thickness for welder qual. giving the thickness limits of QW452.1(b)? 
Parent - By jwright650 (*****) Date 02-06-2009 19:12
As for the bolted assemblies...I don't see this any different than if you had two WF sections with end plates welded and then bolted the two together.
Parent - - By CHGuilford (****) Date 02-06-2009 18:54
My unqualified opinion: 
If the flange is a piping connection then no it would not be a tubular connection.  The term tubular connection as used in D1.1 pertains to HSS members that serve as structural members.
Parent - - By G.S.Crisi (****) Date 02-06-2009 19:01
Right, Chet, the first question that should have been asked was whether the pipe with a flanged end was part of a steel structure or part of a piping system.
Giovanni S. Crisi
Sao Paulo - Brazil
Parent - - By bmaas1 (***) Date 02-06-2009 19:45
This part is for a structural member only.

Brian
Parent - - By Ariel D C (**) Date 02-09-2009 14:54
Seldom see slip-on flanges. In steel structure, commonly used are base plate with stiffener plates welded to CHS.
Parent - By Superflux (****) Date 02-09-2009 15:32
Look at the Denver and Seattle Airports for some slip-ons in a structural application.
Parent - - By Joey (***) Date 02-09-2009 11:13
Prof Crisi,

How are you sir?

Brian did state D1.1.
When you ask if its part of a piping system,
is it possible to combine the requirements of B31.3 and D1.1? :=)

Regards
Joey
Parent - By CHGuilford (****) Date 02-09-2009 17:36
Actually, I think Giovanni was following my line of reasoning. 

It is not unusual at all to have piping connections that someone erroneously specs out as D1.1.  Same with stainless, aluminum, sheet steel, and you name it - they have all been "required" to be welded to D1.1 at one time or another.
Parent - - By G.S.Crisi (****) Date 02-09-2009 23:33
Joey,
No, you can't. B31.3 refers to piping systems in oil refineries and chemical and petrochemical plants. They (the piping systems) carry some kind of fluid and are subjected to internal (or seldom external) pressure, and quite often to high (or seldom sub zero) temperatures. 
D1.1 refers to structural steel, subjected to structural stresses: tension, compression, torsion, flexion, buckling and shear (the primary stresses) and all of the others that derive from them. In this case, as Rick described it, his piece of pipe will be used as a column and will be subjected presumably to compression and buckling.
Giovanni S. Crisi
Parent - By Joey (***) Date 02-10-2009 00:59
thank you Sir :=)
Up Topic Welding Industry / Inspection & Qualification / Tubular Connection

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