D17.1: 2001 QUALIFICATION/CERTIFCATION

Date 03-05-2007 15:51

HellO,
I have not found for the certification process, how weld in 3G position, I mean, upwards progression or downwards progression, or doesn't it matter.
Also, I have a great doubt, I don't know if it is stupid, but I have to ask because I have not found anything.
Does any welding position apply to weld any material (I will use the groove weld test, 3G)? I will certifie the follows materials:
-Inconel 718, t=0.071"
-Ti 6AL-4V, t1=0.063", t2=0.071"
-Aluminum 6061, t1=0.063", t2=0.071"
-Stainless: 17-7PH, t1=0.063", t2=0.071"

By Lawrence (*****)

Date 03-05-2007 17:31 Edited 03-05-2007 18:52

Couple of things,

3G progression.... GTAW (assumed) is traditionally done V-up, The code is silent on vertical progression (as far as I can see) with the exception of figure 4.1 "Suggested Test Record" form which contains a specific box for both up and downward progression.

Your next question still has me confused, I think its a language problem rather than a technical problem so keep trying and we will figure it out together.

Are we talking about a procedure qualification for the listed metals or have you already done PQR's and are now doing welder performance qualifications.

Remember with D17 all procedures must be qualified by testing before a WPS or "weld schedule" can be implemented for production.

Here are some things in the code for you to review.

4.3.1.1 Qualified thickness range...... Remember, for materials 0.063 or thinner you MUST require both a fillet and a groove test. A groove weld will not qualify fillets in this thickness range.

Does any welding position apply to weld any material
See tables 4.3 and 4.4

By TAMPALUIS (**)

Date 03-05-2007 19:32

THANKS LAWRENCE,

ABOUT SECOND QUESTION,

I undertood those things, but my question is, Can I apply 3G position to weld any material? I mean, Do materials have restrictions (composition, mechanical properties) about weld position, without considering thickness range?

I don't know if I was clear

thank you

By Lawrence (*****)

Date 03-05-2007 20:26

Now I *think* understand.

As far as materials and positions... If you can make your procedure qualification coupon samples pass all required tests in a given position than you have proven it can be done eh?

The code does not speak to your question specifically; other than for a welder to be qualified in a given position... 1F, 3F, 6G, etc they must pass performance qualification testing in that position. This assumes that the procedure has been qualified in all positions.

At least thats how I understand it. Other codes are different... ASME section IX for example allows procedure qualification in one postion to cover all positons... Only welder performance tests must be done in the positions represented by production.