Skip to main content

Re: [MW:32724] QW 200.4: Combination of Welding Procedures

By Materials & Welding
Sir, wishing you a very happy new year!!

QW-200.4(b) is an alternative to QW-200.4(a).

Under QW-200.4(a) we can combine the two PQRs, in my below case describe in my earlier email . Writing  one WPS allowing both processes with the following ranges

Base metal: 1.5 to 16 mm
SMAW weld metal: 16 mm maximum
SAW weld metal: 16 mm maximum.

there is no need to use the alternative provisions in QW-200.4(b) to do that. Thus root pass PQR with 13 mm is not required. All I was looking is an interpretation if one js available. 

Thanks for your message. 

On Wed, 29 Dec 2021 at 3:03 PM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
There is revision made in QW 200.4, 2021 edition. 
In 2019, it is clearly mentioned that when combination is made, the process which is going to be used for Root pass, shall have qualified at least 13mm thick.
In 2021, it is not specific about root pass process qualification thickness, but it is clear that u can combined/individual the process in  which each combined or individual might have been qualified at least on 13mm thick. 
If any of process is not qualified on 13mm thick, shall not be combined. any process can be used for root pass with max 2t and another one with maximum base metal thick.

THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE,  CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer. 
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349


On Wed, Dec 29, 2021 at 9:05 AM Sudhakar Kuppuswamy <sudhakarceng@gmail.com> wrote:

Hi,


Currently one of my clients is having an ambiguity in applying the requirements of ASME Section 09 Clause QW 200.4: Combination of Welding Procedures, Subclause:  a & b requirements. Hence, support is required in finding an interpretation from ASME Section 09. (Interpretation in CS connect is not apparent for this clause)

Background: Two PQRs were qualified separately, PQR A is qualified with SAW process using 8 mm thickness plate and PQR B is qualified with SMAW process using 8 mm thickness plate.

Question: While combining the two PQRs to weld a plate with thickness(es) ranging from 1.5 mm to 16 mm.

Do as per QW 200.4, it is necessary to have the root pass process PQR need to be qualified on a minimum 13 mm thickness plate?

I'm pretty sure it is not required to have a root pass process PQR with minimum 13 mm thickness in the above case. However, it would be helpful if you found any interpretation on this.


Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhakarceng@gmail.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/CABF8NYVXu5Nu5k5yKnxevQH8xhLhEqjw0Fw7z0ogm--MNr-F-A%40mail.gmail.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/CAJzm4eP7avyONq_9LgO-jHnv-pdG4hwLPuLC-w2q6Kf0ccJHHQ%40mail.gmail.com.
--

Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhakarceng@gmail.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/CABF8NYWUtqww3C-Td%2BnmyG3WC1M78s00tWp2NzJOUveX4TEaTg%40mail.gmail.com.

Comments

Post a Comment

Popular posts from this blog

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

By Materials & Welding
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...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
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...
21 comments
Read more

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

By Materials & Welding
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...
Post a Comment
Read more