FW: [MW:5793] CPT determination by ASTM G48 Method C

Dear Veloumany,

The scenario is similar to welding of SA516/50 materials with E-7018 electrodes. Welding consumables have to match the mechanical strength requirements of parent metal.

Similar analogy applies here also, ER 2594 welding consumables should have the CPT test results in the CMTR. If the CPT of welding filler is less than that of parent metal you can be rest assured that welds will fail during G48 Method C test or leave it to a chance.Note 45⁰C is significantly high temperature for pitting corrosion test on weldment

Usually corrosion test is an additional /supplementary tests for welding consumables, however the end-user have the right to ask for it. SecII Part-C, SFA 5.9 clause A10 and A 10.1.1 specifies clearly when such tests should be asked for.

As per G-48C , CPT is to be calculated as below. As you can see “Nitrogen is the single most influencing element, which controls the CPT. The attached brochure would provide you some guidance on the typical chemistry, mechanical properties of this alloy.

Hope this would clarify your query well.

Thanks

Pradip Goswami,P.Eng.

Welding & Metallurgical Engineer/Specialist

Ontario Power Generation Inc.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

Date: Sat, 26 Jun 2010 10:26:11 -0700
From: veloumany@yahoo.com
Subject: [MW:5754] CPT determination by ASTM G48 Method C
To: materials-welding@googlegroups.com

Dear Members,

We are planning to establish a PQR for Super Duplex Stain less Steel-

1. Pipe Material-SA 790 UNS 32750

2. Process-GTAW

3.Filler Material-ER2594

One of our client requirement is the minimum Critical Pitting Temperature (CPT) of the weld ment in the as welded condition shall be 45 degree C.

Base Material Test certificate specifies the ASTM G48 Method C requirement.(i.e No pitting observed at the CPT 50 degree C for 24 hrs).

But Filler Material TC doesn't specifies.

1. My query is that it is mandatory that Filler Material TC should specify ASTM G48 requirement to meet the Minimum CPT

2. If not Mandatory,whether welment will pass the corrosion Test as per ASTM G48 Method c

Regards,

S.Veloumany

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