Pipe Welding 5

[QCMike]

Can two welders qualified to deposit 14mm max. weld one pipe joint with a 25mm wall?

 

[Rjeffery]

No. The Certification is for the base material thickness and not the aggregate weld thickness. (nice try, though!)

 

[metengr]

For ASME Section IX welding, yes they can. Multiple welders can fill a weld joint as long as each individual welder does not exceed their weld deposit thickness qualification. Base metal thickness is not an issue for welder performance qualification using the SMAW process (see Section IX, QW-353).

 

[EdStainless]

Have you qualified the process? You have to qualify both the welders and the resulting weld.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

 

[QCMike]

On welder performance qualification cards , on the line marked Materials (P.N0.). If no Group No. is given for P1,
what group is qualified.

If on Materials line P1 to P8 is noted does that mean any steel listed as a P1 to any steel listed as P8 can be welded up to deposited thickness qualifications?

I have Welder Performance Quallification Card that has
P1-P11 is that P1 to P11?

There does not seem to be a consistant way to fill these cards in.

Thanks.
QCMike

 

[stanweld]

QCMike,
Under ASME IX, welders who are qualified on P No. 1 materials are qualified to weld all Group Nos in P-1. He may also weld all P No 1 through P No 11 materials with the F No., welding filler metal qualified; e.g., if the welder qualified on any P No. from 1 thru 11 with the GTAW process and an F-6 filler metal, he is qualified to weld on any P No. 1 thru 11, including all Group Nos therein. REF.QW-423.1.

 

[QCMike]

Should stainless electrodes be kept in a bake oven?

 

[QCMike]

I have a welding procedure and the PQR was done on Grade 304L P8 material.

On form QW-482, under Base Metals QW-403 P8 to P8 is listed.

Under Spec. type & grade ,Chem. analysis & mec. Prop. NA is on every line.

Does this mean any P8 to P8 material can be welded with this WPS.

The Welding Procedurre Data Sheet for this WPS under Material Designations: lists 304(L) P8
,Electrode Classification ER308(L)/E308(L)-17.

Can 316(L) be welded using this WPS eventhough the data sheet lists one material and one consumable?

 

[JasonLouie]

As per QW-424.1, any metal with the same P-number as the PQR coupon can be welded with that weld procedure. For impact tested coupons, the Group numbers need to match as well.

For a 304L PQR coupon, any P-number 8 material can be used in the WPS.

I have a question regarding your "Welding Procedure Data Sheet". Is this a WPDS as per CSA W47.1, or is this an internal company welding instruction sheet? If it is a CSA WPDS, then you have to read W47.1 for limitations on your welding variables.

My previous company had internal Welding Data Sheets that were written by the metallurgist/welding engineer. These were specific sets of instructions for a specific job. If this is the type of document you have, then should follow the data sheet or discuss with the person who issued the data sheet.

Otherwise, I do not know what a Welding Procedure Data Sheets is since it is not in ASME IX.

 

[QCMike]

JasonLouie,

The WPDS form does not list an origin. It does have a line that says Ref.ASME Sec.IX LIL-150 Rev. 0, which is the WPS I mentioned in the post that you answered.Under applicable Codes it list ASME B31.3.

 

[JasonLouie]

Just a shot in the dark - is this a Ledcor procedure?

Yes, this procedure can be used to weld 316 materials.

 

[QCMike]

JasonLouie,
Yes, it is a Ledcor procedure. How did you know that?

 

[JasonLouie]

QCMike,
I have seen this procedure before. I do not have a Welding Procedure Data Sheet with it, but as I said before, 316 can be welded with this procedure.

 

[QCMike]

Should Stainless electrodes be kept in a bake oven, or just kept warm and dry?

 

[QCMike]

I have another question about the WPS for stainless.

If the parameters on the wps can be used for any P8 material, wouldn't a new welding procedure data sheet have to be made listing 316L consumables and 316L base material?

Would any further testing be required since the consumable and base metal have been changed from the original PQR or do you just use the same wpds and change consumable and material?

 

[JasonLouie]

ASME has defined P-numbers and F-numbers to minimize the number of weld procedures which need to be tested. Please read QW-424 and QW-430 for more details.

 

[QCMike]

Should Stainless electrodes be kept in a bake oven, or just kept warm and dry?

 

[QCMike]

I need to wrilte a PWHT procedure for P1 material both sour and non-sour service. The material for the moment is A 106 B.
Is there a formula I can use to determine max. rate per
hour the temp can be raised, duration of soak and rate of cooling per hour?

Is there a rate and temp. that must not be exceeded when heating and cooling?

Once max rate of heating is determined, is there a formula to calculate at what temp. you start to raise to soak temp?

 

[gtaw]

SMAW elelctrodes for austenitic stainless steel should be stored at 250 degrees F based on AWS D1.6 Structural Welding Code/Stainless Steel.

ASME will not list the requirements for electrode stroage.

Best regards - Al

Best regards - Al

 

[SJones]

QC Mike,

Assuming that you are dealing with piping fabrication, you may wish to consult ASME B31.3, Clause 331. Reference to AWS D10.10 wouldn't go amiss either.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/