INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!

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!

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

LINK TO THIS FORUM!

Eng-Tips LinkedIn^® Group

Join our
LinkedIn^® Group!

Hook up with past and present colleagues and classmates quickly.

Partner With Us!

"Best Of Breed" Forums Add Stickiness To Your Site

(Download This Button Today!)

Feedback

"...What a great service! This is the best site I've ever seen!!! It totally restores my faith in humanity when people take time out to help other people..."

More...

Geography

Where in the world do Eng-Tips members come from?

Click Here To Find Out!

Eng-Tips Shirts!

Get your
Eng-Tips Forums
SWAG here!

Home > Forums > Engineering Forums by Industry > Steel Engineering > Steel and Stainless engineering Forum

G48 Test Temperature

Read More Threads Like This One

JMac2 (Petroleum)

9 Mar 12 10:44

After many attempts we have finally been able to qualify our super duplex welding procedure with the G48 Method A at 40 degrees C. As part of our welder qualification process we are also requiring each welder to pass a G48 test. This has proved to be a bit problematic in that we have had several welder qualification fail the G48 even though they are welding inside the parameters of the weld procedure. This is a multiple pass manual weld (.375" wall). Our acceptance criteria is <4.0 g/m2 with no pitting on the test faces. We are considering changeing the test temperature to 35 degrees but we need to justify making this change to our specification. Any information that can help quantify the difference in testing temperatures (35 vs 40 degrees) would be appreciated.

EdStainless (Materials)

9 Mar 12 17:12

My first thought is to move to Method C, it is a little more aggressive but also more repeatable.
Are you actually trying to test pitting resistance or are you looking for intermetallics? What is your sample prep?
If you are looking for intermetallics then the surfaces need to all be ground with no pickling or passivation.
For pitting the samples should be exactly like they are going into service.

At 40C you are already well below the raw material values (prob 65C or higher).
Maybe 35C with a slightly lower rejection level? We can identify pitting in samples with 2mg/cm2 weight loss.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

SJones (Petroleum)

10 Mar 12 3:20

Why are you imposing corrosion testing on your welders? It is the welding procedure specification that drives the corrosion performance. If you are getting failures from welds made within the procedure, does it not tend to suggest that the procedure is suspect?!!

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

metengr (Materials)

10 Mar 12 10:06

Agree with SJones.

EdStainless (Materials)

11 Mar 12 11:14

If some welders have passed and others haven't then yes, you have a procedure issue for sure.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

HEC (Mechanical)

26 Mar 12 0:25

The process is the issue if some welders are passing and others are not. What specifically is the material, and where are the failures occuring? Is it pitting, in weld material, in parent or HAZ? Good quality background informatin gets best answers!

Mark Hutton

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!

Back To Forum

Back To Steel and Stainless engineering