question on standard US weld notes 3

[KENAT]

I posted thread1103-172691 asking about standard US commercial weld notes but didn't get a complete answer. Anyone here have some ideas. The below is what I had in the UK (they may be a little out of date as the specs kept changing)

1. Weld symbols comply with BS EN 22553.

Steel

2. Welding to be in accordance with BS EN 1011 Parts 1 & 2 using MIG or TIG process using filler rod to BS EN 440.

Stainless

2. Welding to be in accordance with BS EN 1011 Parts 1 & 3 using MIG or TIG process using filler rod to BS EN 440.

Alluminum

2. Welding to be in accordance with BS EN 1011 Parts 1 & 4 rods or filler to BS2901

For note 1 I’m happy that referencing AWS 2.4 covers this, actually since we reference Y14.100 on our standard notes I arguably don’t need to call our AWS 2.4 specifically.

However, guidance on what to put for note 2 would be appreciated.

 

[gtaw]

The notes on the drawing are going to be dependent on the type of weldment being fabricated. I would suggest the following:

1) "Welding symbols shall be interpreted in accordance with AWS A2.4-XX", where XX indicates the year the welding symbol standard was published. This will allow a user to reference the proper edition of the standard in years to come should maintenance be required or a new part has to be fabricated using the old drawings. "The weld size specified by the welding symbol shall be considered to be the smallest weld size accepted." Welding symbols for contract drawings need only specify the required weld size, i.e., groove details are left to the fabricator to select.

2) Welding Standard/Code - "All welding shall be performed in accordance with the following welding standard/code:"
AWS D1.1-XX for structural / Steel
AWS D1.2-XX for Structural / Aluminum
AWS D1.6-XX for Structural / Stainless Steel
ASME Section VIII-XX for unfired pressure vessels
ASME B31.1-XX for power piping
ASME B31.3-XX, Category Normal, M, etc. for process piping

3) "Welders and welding procedures shall be qualified and certified in accordance with the applicable welding standard/code referenced in the notes." I prefer to have the welders qualified within the previous 12 months if the work is critical and I prefer to have the qualification and testing conducted by a third party, preferably conducted and witnessed by an individual qualified and certified as an AWS Certified Welding Inspector or Senior Certified Welding Inspector in accordance with AWS QC1.

4) NDT
a) "Personnel performing NDT, other than visual inspections, shall be qualified and certified in accordance with ASNT CP-189 or shall be qualified and certified to Level II or Professional Level III in accordance with ASNT ACCP."
b) “Visual welding inspections are to be performed by individuals currently certified as AWS CWI or AWS SCWI in accordance with AWS QC1-XX.”
c) "NDT shall be as specified by the NDT symbol per AWS A2.4-XX." The NDT symbol can be used to specify the NDT process, procedure, location, and extent of testing required on a joint by joint basis. NDT symbols follow many of the conventions of the standard welding symbol.
d) NDT procedures and techniques, including VT, shall be in accordance with the applicable welding standard/code referenced by the notes."


The selection of welding process and procedure can be left to the fabricator. However, that being said, the engineer or design professional should always request copies of the welding procedure specification and supporting procedure qualification records (when required by the welding standard) as well and the welder qualification records. The documentation should be reviewed and commented on by someone that is qualified to perform such a review. For that purpose I would recommend utilizing the services of a person that is certified as an AWS SCWI per QC1. It would also be prudent to review the fabrication drawing that utilize complete AWS welding and NDT symbols to specify all the weld joint details, appropriate welding procedures, and NDT requirements.

The design professional should also request copies of NDT procedures, the contractor’s Written Practice, and copies of the technician’s certifications and supporting documents should be requested and reviewed by an individual certified as an ACCP Professional Level III per ASNT ACCP program.

The reviews of the fabricator's documentation should be completed before fabrication starts. Any short comings should be discussed and resolved before fabrication is begun or possibly before the final purchase order is released.


Best regards - Al

 

[KENAT]

Thanks very much gtaw.

We manufacture metrology equipment & don't do a lot of welding but we had a failure on a cantiliver arm that carried a monitor & keyboard a little while back so we're looking again at how it's specified on drawings.