SA-325 P-NUMBER? 8

[RAGER]

Dear All,

We have a drawing and request use SA-325 welded on SA-106B MAIN PIPE as fixed bolt.

but I can not find out the P-number for SA-325.

Can anyone give input on this?

 

[DekDee]

It does not have a P number - it is a specification for bolts.

 

[RAGER]

DekDee, If it does not have a P number, how can we choice an applicable WPS for it?

 

[SnTMan]

Don't weld bolts.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[DekDee]

You have to qualify a new WPS for it because it is classed as an unassigned material.

 

I repeat, don't weld bolts.
(There's a reason some products are not listed in QW-422.)

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[MJCronin]

Some information on this topic here:

https://www.eng-tips.com/viewthread.cfm?qid=484859

Please note that this refers to "strength welds" not the tack welds sometimes used to perform a locking function on threaded fasteners

Also here:

https://www.portlandbolt.com/technical/faqs/bolt-welding-guidelines/

MJCronin
Sr. Process Engineer

 

[JStephen]

Higher-strength bolts (like A325) are likely to be heat-treated and/or strain-hardened material, so it's not just a welding issue, it also involves strength properties of the bolt itself.
Confirm with the designer what is needed. Possibly weld a clip of some kind with the bolt going through it.
You can thread rod produced to A36 or similar, or get anchor bolts that are basically A36 (and may or may not be dual-certified as such)- and that might be a better solution.
Sometimes people figure "stronger is better" and specify higher-strength stuff when they don't need it just because.

 

[RAGER]

Dear ALL
Thanks for sharing your experience.
The bolt welded on main pipe for fixed with casing side
It may not have strength properties issue.
But We will design change to machine it form A36 to avoid it.