Re: [MW:30668] Chemical analysis mentioning in WPS and PQR for hard facing overlay weld

Chemical analysis is not mandatory in PQR unless it is mentioned in WPS before PQR Qualification. Whatever the elements mentioned in WPS, it should be done in PQR. Ref QW 216.

On Sun, 29 Mar 2020 5:36 pm , <sathishmech04@gmail.com> wrote:

Dear Experts
Process:PTAW
MATERIAL GRADE:P.NO.1,8,5A,15E
Hard facing overlay welding
4 to 5mm welded and machined to 1.6mm. Found hardness and macro examination cleared

QW-216.4. It defines that chemical analysis nominally matching the weld deposit chemical analysis may be substituted to qualify the PQR. Can anyone explain this meaning?

Recently I have qualified hard facing weld overlay. In that during chemical analysis I have got C, Si, Mn, P, S, Cr, Mo, Ni, W, Fe and CO chemical elements. So actual attained chemical composition I have mentioned in PQR. During WPS preparation I have mentioned only nominal chemical elements i.e., Co, Cr, W, C only as explained in the QW-216.4.

But my TPI agency is opposing my prepared WPS. That they are telling to put all the elements in WPS. I have argued them that this is the nominal chemical elements important for hard facing. However I have tested in 1.6mm after weld to the machined surface. So Fe comes to 5 to 10%. However I have cleared the Macro and hardness examination.

Also I have previous done the same paremeter and same has been accepted by same TPI. This same also shown but they are rejecting this was signed on 2016 and based on client request only we accepted this.

Note: I have explained them this elements Cr,Co & W -All are very important in HF overlay welding. Cr- Increase the Corrosion resistance.Carbide formation of Cr,Co & W - It will increase the hardness value and wear resistance.

But although they are rejecting my request. Please clarify

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/5042dc51-6389-4351-b73e-32f03ac57b8d%40googlegroups.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAJzm4eOGrpkUTAqjYDdAF045z1HaJBv0GiD87BirvWoihzw5iQ%40mail.gmail.com.

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...

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...

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...

Materials & Welding

Search This Blog