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


Rule of thumb for weld strength in various metals?

Rule of thumb for weld strength in various metals?

Rule of thumb for weld strength in various metals?

Hi All,

I’m curious if you have a general practical rule for estimating weld strengths in different metals.

Steel – Most of what I’ve heard says that a high quality weld is as strong as the base steel.

Aluminum – I’ve heard that quality weld strength is ~ 60% as strong as the base aluminum.

Stainless steel - ?

Titanium - ?


RE: Rule of thumb for weld strength in various metals?


In many cases, the aluminium around the weld has a yield strength of about 20% of the unwelded base material.

Any material that is heat treated or work hardened, loses strength when it is welded. Sometimes, it is practical to re-heat treat. Some times, it is not. I don't think re-work-hardening is feasible. There is no substitute for understanding metallurgy, and knowing something about the welding processes.


RE: Rule of thumb for weld strength in various metals?

A lot of design work involves compliance with different design standards which specify allowable weld strength, and depending on that standard, weld strength may be taken the same as or lower than base metal strength. Those standards will also specify how weld strength is determined (IE, root of fillets vs leg, etc.) So, for example, ASME code, Structural Welding Code, Aluminum Design Manual, etc.
In some cases, fatigue may enter into it to complicate the situation, also addressed in those various standards.

RE: Rule of thumb for weld strength in various metals?

The type of welding process used is very important. Conventional fusion processes like TIG or MIG can produce good weld properties if performed carefully. Specialized fusion processes like EB or laser can give excellent weld properties. Solid state processes like friction or stir welding can produce extremely high quality welds with properties equal to the base metal.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close