Class 2 welds?

Date 05-12-2008 18:04

Gentleman-

I've seen this a few times called out on drawings. That a weld needs to be a "Class 2". Where can I find info on what defines a particular class of weld? Is this a general type of call out, or is it specific to a particular code?

Thanks
Jason

By Lawrence (*****)

Date 05-12-2008 18:44 Edited 05-12-2008 18:47

This is all I could find,

From an article
Use Caution When Specifying "Seal Welds"
Welding Innovation Vol. XVI, No. 2, 1999
Practical Ideas for the Design Professional by Duane K. Miller, Sc.D., P.E.

"The American Galvanizers Association (AGA)
defines three classes for welded assemblies that will be
galvanized. Class 1 Joints are held together by a full seal
weld. Class 2 Joints are held together by seal welds, but
the overlapped area is large enough to require venting, i.e.,
provision of an escape hole for the release of expanding
trapped gases. Class 3 Joint details do not contain seal
welds."

Here is the link to the full article.
http://www.jflf.org/pdfs/papers/design_file6.pdf

And also ASME B31.8 SYSTEM CLASS CRITERIA Note page 9
http://engstandards.lanl.gov/engrman/13weld/pdf/2-01_Att.3-R0.pdf

By flamin

Date 05-12-2008 19:32

Thanks for the links!!

That's interesting, LANL (Los Alamos National Laboratories) is one of our main customers, seems like we should have that data in our QC files somewhere. I might have to go dig a little further.

Jason