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Up Topic Welding Industry / Technical Discussions / weld preparation
- - By Soheyl Date 03-08-2007 14:28
Hi Guys,
I was wondering if anybody knows that which part of ASME pressure vessle codes refer to plate edge preparation ( beveling ) before welding. or there is not such this restriction and we can weld even the square edges without any preparation?

Thanks,
Parent - - By jon20013 (*****) Date 03-08-2007 14:30
Which code are you working with specifically?  Almost all have some type requirement.  What thickness and material?
Parent - - By Soheyl Date 03-08-2007 15:01
it's a longitudinal weld on pressure vessle, plate material is 304L with 0.164" thk.
Parent - By jon20013 (*****) Date 03-08-2007 15:49
Is the pressure vessel to be designed / fabricated in accordance with ASME Section VIII?
Parent - By RANDER (***) Date 03-08-2007 15:50 Edited 03-08-2007 15:55
Soheyl,
As Jon stated we would need to know what code you are working to in order to give you any real helpful answer.  Do you have access to the applicable code?
sorry jon beat me to it.
Parent - - By 803056 (*****) Date 03-08-2007 16:11
I don't believe ASME code sections are going to provide much direction or recommendations on the details of groove designs. They may indicate specific joint details that are prohibited (Section VIII). The code sections may also reference ANSI/ASME B16.25 (as in the case of B31.1 and B31.3) that will provide some guidance. However, as is often pointed out, ASME code sections are not "handbooks" and they are not "design manuals".

I suggest refering to AWS literature such as the welding codes and recommended practices for guidance on the detailing of various grooves. What works for a bridge or building, relative to groove angles, root openings, etc., should also be applicable to pressure vessels provided the joint detail in question isn't specifically prohibited by the applicable ASME section (construction code). You will also have to give consideration to restrictions and limitations listed in each of the applicable ASME sections, e.g., the use of a backing rings may be prohibited in certain pressure piping systems,  backing, when used, may have to be removed, etc.

Best regards - Al
Parent - - By js55 (*****) Date 03-08-2007 16:23
I don't remember any particular bevel designs prohibited by ASME code sections, though I don't have any of them in front of me now. In fact, Section IX designates them as non essential variables.
But Al's advice is right on. Given that you are asking this question further research is a must. Sound engineering design. For example, a square butt joint would not be suitable for SAW of 1" thick material.
Parent - - By Soheyl Date 03-08-2007 16:45
it's not 1" thk plate, as I mentioned it's a rolled plate with 0.164" thk. the weld is for longitudinal run and it's a low pressure vessle.
Parent - - By js55 (*****) Date 03-08-2007 16:50
I was just using that as an example, in that the codes overall do not make a point of determining specific joint designs. that is up to the design, or weldng engineer. The joint needs to be suitable to the service, the material, and the welding process.
Parent - - By js55 (*****) Date 03-08-2007 16:52
I think the point is that a square bevel, your specific case, to  my knowledge, is not prohibited. And its adequacy shall be determined by qualification.
Parent - - By jon20013 (*****) Date 03-08-2007 16:57
js55, I would generally agree that a square butt would likely be acceptable (given the thickness of material), but would really need to know which ASME Code applies in order to say for sure.
Parent - - By js55 (*****) Date 03-08-2007 17:00
You're right Jon.
Parent - - By js55 (*****) Date 03-08-2007 17:01
I'm just offering opinions. One is best not rely on my senile memory for engineering design.
Parent - - By jon20013 (*****) Date 03-08-2007 17:03
Are you calling me senile??? ;-)  Ahhh, heck I even misread your post!

I know, and agree with what you're saying Jeff.  Your opinions are definately valid.
Parent - - By js55 (*****) Date 03-08-2007 17:06
Jon,
I think that with alarge enough chorus we may even help some folks in here.
Parent - - By jon20013 (*****) Date 03-08-2007 17:10
I think, like many "Code people" think, that the best help would be if some of the posters would actually "try" READING the Code before asking advice... Man, are my teeth showing? ;-)
Parent - By js55 (*****) Date 03-08-2007 17:17
Yeah but that's good Jon. I'm with ya.
Parent - By jon20013 (*****) Date 03-08-2007 16:54
Soheyl; most generally, ASME Codes defer to the WPS for joint preps but there are a few that actually list "acceptable" and "unacceptable" joint details.  From your description, I would guess that the Code would refer to your WPS but we really need to know WHICH ASME Code governs the work in order to give the best answer.
Up Topic Welding Industry / Technical Discussions / weld preparation

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