RE: [MW:7975] ER70S-6 filler classification as A no1?

In addition to Mr Pradip Goswami views, Pl. find attached past discussion on the similar subject in the group (#MW99)

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Monday, November 01, 2010 4:16 AM
To: materials-welding@googlegroups.com
Subject: [MW:7971] RE: 7969 - A No Issue.

Hi J.C.Andrews,

It's true that ER-70S-6 does not fall within the A No range as per ASME Sec-IX (I attached illustrations form Sec-II, Part C and Sec-IX below). Sec-II Part C has incorporated enormous number of AWS classifications over the years, and all of these consumable may not have exact A No.

However should fabricators end up in a scenario like this the following QW-404.5 should be applied to justify use of ER-70S-6 consumable and others on the basis of chemical composition reported. Change of A No issue is an essential variable.

QW-404.5 (Applicable only to ferrous metals). A change in the chemical composition of the weld deposit from one A-Number to any other A-Number in table QW-442. The weld metal chemical composition may be determined by any of the following:-

For SMAW, GTAW, and PAW — from the chemical analysis of the weld deposit prepared according to the filler metal specification, or from the chemical composition as reported either in the filler metal specification or the manufacturer’s or supplier’s certificate of compliance.

In lieu of an A-Number designation, the nominal chemical composition of the weld deposit shall be indicated on the WPS and on the PQR. Designation of nominal chemical composition may also be by reference to the AWS classification except for the “G” suffix classification, the manufacturer's trade designation, or other established procurement documents.

I hop this would help to clear the doubts.

Thanks.

Pradip Goswami,P.Eng.

Welding & Metallurgical Specialist & Consultant

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of cyril andrews
Sent: Sunday, October 31, 2010 11:36 AM
To: materials-welding@googlegroups.com
Subject: [MW:7969]

Dear all ,

I hope the detail which I am going to ask may be familiar to all,

The Query is for GTAW –Carbon Steel welding some time we will use ER-70S-6 but it is not having valid A-Number as per ASME Section IX. But in ASME Section II –C they given this electrode chemical composition for one range but in ASME Section IX they have some limitations for A-Numbers.

Why this happens it all under ASME Code. Can anyone explain. How to solve this problem. For example some company bought ER-70S-6 in huge amount what they will do. Please find a solution?????????????

J.C.Andrews,

QA/QC Engineer,

Doha-Qatar.

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materials & Welding

Search This Blog