4130

Date 08-28-2009 02:37

I have been asked to qualify a procedure that is using a 4130 HR alloy as the base material, 3/4" thick, single vee groove with backing. Using FCAW process and a 316L stainless steel electrode. Can or should this be done? I have welded various steels using a 309 or 309L but I was pretty sure the 316L was used to weld type 316 stainless. My concern is to qualify the PQR guided bends an tensiles are required doesn't sound like a compatable situation. Besides this application is more of an overlay than anything. The primary function is to not to join two pieces but rather to fill a machined groove on a valve flange to make it more resistant to corrosion. I would rather favor a 309L applied for the first layer and then the 316 over the 309L for the subsequent layers. Comments?................

Thanks,
C. Miller

By 803056

Date 08-28-2009 03:44

The 309 transition layer sounds reasonable.

There are procedures for qualifying surfacing welds listed in ASME Section IX and AWS B2.1 that may be applicable to your situation.

Best regards - Al

By Superflux (****)

Date 08-28-2009 05:52

When I worked for "XYZ" making hi-pressure oilfield valves etc. We used 316 and Hastelloy (don't remember the exact alloy #) inlays on 4140 for ring grooves. We preheated to 600F and then stress relieved. Unfortunately I don't remember the PWHT temp, but 1250F seems to come to mind.

By ssbn727 (*****)

Date 08-28-2009 09:50

"Weldcome to the World's Greatest Welding Forum" C. Miller! ;)

The key terms involved with your situation are "Dilution, Buttering layer, Carbon Migration and Delta Ferrite."

All of these are relevant terms used in dissimilar welding including their definitions & roles, and need to be carefully monitored as well as controlled when depositing successful overlays...

Consider this article as a baseline:

http://www.fandmmag.com/publication/article.jsp?pubId=1&id=124&pageNum=4

This one covers sour oilfield environments including weld overlays on 4130 & 4140 with Alloy 625 and alternatives such as Alloy 686, Alloy 725 filler and Alloy 925 respectively...
One can read the specifically referenced weld overlay examples on page 4 of 14 in the .pdf below:

http://www.specialmetals.com/documents/Corrosion%20Resistant%20OCTG%20and%20Bar%20for%20Sour%20Gas%20Service.pdf

Here's another good article which may or may not be helpful towards your specific application:

http://www.aade.org/TechPapers/2001Papers/productivity/AADE%2046.pdf

Just out of curiosity I'm posting this .pdf so I can ask you if this is the type of work you're involved with:

http://www.clearbluesolutions.com/pdf/Cansco_brochure.pdf

This may or may not apply to your specific situation yet, it may become useful in the future:

http://mydocs.epri.com/docs/public/000000000001002943.pdf

Finally here's a good reference .pdf on "Engineering with Clad Steel""

http://www.corrosionsource.com/technicallibrary/nidi/literature/pdf/10064.pdf

I hope you'll find this data helpful!!! :) :) :) Enjoy! ;)

Respectfully,
Henry

By RonG

Date 08-28-2009 13:55

309L is used very often to avoid a PWHT but I do not think that is the intent.

It would seem someone wants that (312L) chemistry for what ever purpose.

Like Henry mentioned Dilution is the important factor.

Most likely the coupon will be slice and etched rather than bend test.

But to answer your question. Yes it can be done.

By Milton Gravitt (***)

Date 08-31-2009 13:13

I have welded 4130 1/8 & .090 thick materials with ER 310 SS electrode because that was what the print called for it also called out a preheat of 400° and a stress relief at 750° to 800°.
So if you qualify the PQR and I meets what the customer wanted I don't see why you couldn't.

MG

By cwi49cwe (*)

Date 09-07-2009 01:43

I agree with all the entries, we had a couple of jobs similiar to this , one the customer required the facing fill to be 309 LMo, flux-core wire, preheated at 450F and PWHT at 950F and the other was speced out with Special Metals alloy 686cpt, 450F preheat and 1000F PWHT, furnace cooled. No problems with either, it was all a matter of the engineered application.