Wednesday, March 16, 2011

RE: [MW:10387] CS to SS welding

Herman,

 

I would like to add that when I worked for Westinghouse, we developed welding procedures with peening for certain applications which were very sensitive to distortion.  With the addition of peening we were able to prevent almost all distortion.  I think the use of peening is overlooked as an effective means for controlling both distortion and some forms of stress corrosion cracking.

 

John

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pieper QSI
Sent: Wednesday, March 16, 2011 6:59 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:10386] CS to SS welding

 

Dear Mr. Breaux,

 

Yes there are results of test programs for several international well known companies where these technology is applied during welding. I personally just finished a project where it is applied during repair welding of a heat exchanger shell. End customer was a large Norwegian Oil Company for which we had to perform a so called Mock-up in front of this treatment in order to prove this really reduces shrinkage, stresses and distortion.  Test was executed together with a famous German Engineering company which was responsible for Engineering this heat exchanger. Results of the tests show 40% less shrinkage when applying this technology on every single weld run compared to the as welded condition. When looking at the distortion we have results where up to 60% less angle distortion is achieved compared to the as welded condition.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens Tommy Breaux
Verzonden: woensdag 16 maart 2011 12:30
Aan: materials-welding@googlegroups.com
Onderwerp: RE: [MW:10385] CS to SS welding

 

Dear Sir,

 

Do you have any proof that this method works besides the vendor’s claims?

 

 

 

Tommy Breaux, Mech. Eng.

President

Engineered Casting Repair Services, Inc. / METALOCK CORP

Office 225-791-8900

Cell      225-573-3059

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pieper QSI
Sent: Tuesday, March 15, 2011 3:53 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:10361] CS to SS welding

 

Dear Praveen,

 

You may also apply high frequency hammering technologies like Pneumatic Impact Treatment during welding in order to control the amount of distortion.

With such technologies you can reduce distortion up to 50% when applied on every separate weld layer.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens vineet kumar
Verzonden: maandag 14 maart 2011 14:15
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:10341] CS to SS welding

 

Dear,

Distortion occurs when the Stress occurs due to Thermal Expansion or contraction exceed the Yield strength of material. 

Factors affecting distortion, are:

1)Parent material properties

2)Amount of restraint 

3)Joint design

4)Part fit-up

5)Welding procedure

Controls:

1) Preheating

2) Use of Stiffeners,Welding Jig & Fixtures, Flexible clamps.

3) Intermittent Welding process

You can control the distortion by keeping these points in mind .

You are recommended to use ER 309 L.

Regards,

 

Vineet Kumar

 

 

On Thu, Mar 10, 2011 at 4:48 PM, praveen nair <praveen_nair9894@yahoo.co.in> wrote:


dear experts,

   we have to make a rectangular type of furnace, in that we have to weld SS304 bars into CS plate from both sides and chances of distortion is more, plate thickness comes around 16mm and bars of 10 mm, client requirement in MIG or TIG welding,
which process is better MIG or TIG to reduce distortion...??
Can i use ER308 filler wire..?
and methods for reducing distortion. We are doing stitch welding mainly

praveen nair

 

--
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/
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.

 

--
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/
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.

--
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/
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.

--
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/
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.

--
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/
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.

No comments:

[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...