×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

weld calculation question

weld calculation question

weld calculation question

(OP)
Hi everyone,

i have to do some weld strength calculation with which i don't have any experience. i am using EN1993-1-8 to guide me, but i have 2 questions:

1. in section 4.5.3.2 item 6, can anyone tell me what gamma_M2 is, that is used in the strength criterion of a fillet weld?
2. in the same criterion beta_w is used. values are listed for steel types, but i have to calculate welds in a stainless steel structure. how can i find the beta_w values for AISI316L? or should I be using a different spec?

Thanks!
Mark

RE: weld calculation question

It is a *lot* easier to design your fillets as a 'string'. This method is widely used, especially for structural - AISC items.

In Pound-Inch units, there is a handy combined constant of 928 lb for 70Ksi filler metal.

The strength of a fillet weld is 928 * [leg size in 1/16's of inch] * [Length in inches]
thus a 1/4" fillet weld [1/4" leg lengths, not throat, that is 11-inches long has a Design Strength of 928 * 4 * 11 = 40,700 lbs.

Note that this is not Yield or Tensile, this has the necessary derate to give a Safety Factor of 2, just like the BSSA calc uses.

RE: weld calculation question

I have seen that approximation used, but only after the first 1/4 inch and last 1/4 inch of the fillet weld is subtracted off - as if the ends of the weld do not develope any strength.

RE: weld calculation question

1. Gamma_M2 is a partial factor applied to the resistance of the weld. The various numbers relate to various types of resistance, 0 for tension, 1 for buckling etc. They are all found in BS EN 1993-1-1, but should replaced by the decisions found in the UK National Annex. If you're using the UK National Annex for BS EN 1993-1-8, it is given as 1.25.

To use the Eurocodes successfully you (strictly) need to have a good overview of BS EN 1990, which outlines the philosophy of the Eurocodes. You can't really use one part in isolation.

2. The correlation factor, as far as I'm aware, is a fudge factor representing the fact that during testing fillet welds have been found to give sufficiently higher resistance than predicted using calculations models. These tests would only have been carried out on welds between materials that have been produced in accordance with specifications allowed by the Eurocodes. If you're not using any of the specifications in the table, you should use a Bw of unity.

RE: weld calculation question

(OP)
Thanks all!

Have been reading through the eurocodes and I think I'll be able to figure it all out.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources