Skip to main content

[MW:17139] RE: 17114] RE: 17098] Welding Of Pipe CRA to Pipe CRA

By Materials & Welding

Mr. Goswami,

 

Is it possible if we use duplex consumables from root to capping?

The reason is to simplify the welding consumables since we also have welding of duplex flange to Pipe CRA using duplex for the welding consumables.

 

 

Regard's

 

 

 

 

Budi Witjaksono

Project Manager

Phone: +62 778 413 250 ext: 135

Mobile: +62 811 770 5039

Fax: +62 778 413 260

Skype: budi.witjaksono

Email: budi.witjaksono@profab-group.com

Website: www.profab-group.com

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Saturday, March 16, 2013 10:21 AM
To: materials-welding@googlegroups.com
Subject: [MW:17114] RE: 17098] Welding Of Pipe CRA to Pipe CRA

 

Hello Budi,

 

The brief responses to your query are as follows:-

 

  • weld Root with GTAW ER316- This is O.k as long as the root pass is contained within the clad (S.S-316L). However while  containing  316L run within the clad, one has to ensure that root pass is free from weld defect, such that no repair is warranted
  • Hot Pass with SMAW  E309L Mo --this is acceptable, as 309MoL( 25Cr/12Ni/2.5 Mo) with will tolerate the dilution of  the ferritic API 5L X65 steel
  • Subsequent Fill/ Cap with E316L--Not acceptable, why?? Calculate the weld metal composition at the weld /HAZ interface. Assume nominal 20 % dilution occurring at the interface. What would be the 316L(19Cr/12Ni-2.5Mo) chemistry with this dilution? The weld metal could be just borderline austenitic. The  weld ductility  could be a factor. Hence the advice is to continue  welding with 309MoL right up to the cap.

The other alternative would be to use 309MoL welding consumable ( both GTAW & SMAW process).For the root pass+one hot pass, use GTAW, followed by SMAW the rest. This is suggested provided the client allows  weld metal of slight different chemistry for the wetted surface.

Note:-309MoL weld metal may have slightly higher ferrite no that 316L base metal.

 

Thanks

 

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Budi Witjaksono
Sent: Thursday, March 14, 2013 9:40 PM
To: materials-welding@googlegroups.com
Subject: [MW:17098] Welding Of Pipe CRA to Pipe CRA

Gents,

 

We have CRA pipe to be welded to CRA pipe (API 5LX65 16-in NB x 23 WT with 3 mm 316L cladding) to be welded from one side.

One electrode supplier suggesting to weld Root with GTAW ER316, Hot Pass with E309L Mo and Fill/ Cap with E316L.

Could you please advise whether advisable to use E316 L for Fill and Cap? Please assist to respond with technical back-up since I need to convince our welding manager.

 

 

Regard's

 

 

 

 

Budi Witjaksono

Project Manager

Phone: +62 778 413 250 ext: 135

Mobile: +62 811 770 5039

Fax: +62 778 413 260

Skype: budi.witjaksono

Email: budi.witjaksono@profab-group.com

Website: www.profab-group.com

 

 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
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.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
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.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

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