Formulas for sizing a weld

Question

Formulas for sizing a weld

UncleSam (Mechanical)

(OP)

8 Apr 04 14:40

What would be the proper formulas to use for sizing a weld that would hold a branch connection. The main line is 10" schedule 40 with approximately 120psi air in it. We want to branch off with a 3" line. I know everyone is going to say use a weldolet, and that is more than likely the way we are going to go. It will be a 90 degree branch.

But, I am a rookie engineer and I am interested in seeing some formulas and sizing a weld or welds.

Thank you for your help.

UncleSam

unclesyd (Materials) · Answer 1 · 2004-04-09 13:54:20

The size and type of weld for a branch connection is determined by the code requirements and calculations. The size of the weld depends on the type of connection permissible under your conditions. There are a few general rules that apply but should only be used by someone well versed in piping design, so go with the code recommendations for the present.

For welds other than piping get access to the "Design of Weldments by Omer Blodgett" there is a section (6.3) for determining weld size for various types of connections.

The book can usually be purchased from any bookstore or directly from the website..

https://ssl.lincolnelectric.com/lincoln/spmount/item.asp?prodnum=DW

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Formulas for sizing a weld