--Thanks to all for all of the responses to my original question regarding the peening.
Does anyone in the group have any experience with the equipment that actually sets up a low amplitude high frequency vibration in the article being welded? Claims are made by the sellers of this equipment that parts subjected to this process will be relieved of internal stresses as a post weld process and that if it is applied to the part while it is being welded that welds will have a better grain structure and lower residual stresses.
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: Wednesday, March 16, 2011 9:31 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:10388] CS to SS welding
Thanks John,
I agree with that, we have also several applications where this technology is applied in order to enhance materials and/or welds stress corrosion resistance.
Of course these technologies normally most are used in cases where fatigue is the problem you can use it for these applications as well.
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
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens John Henning
Verzonden: woensdag 16 maart 2011 14:35
Aan: materials-welding@googlegroups.com
Onderwerp: 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
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
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
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