[MW:12174] RE: 12173] welding procedure for distortion control

Dear Mr. Bhatt,

 

All mentioned technologies create distortion but the amount depends on the number of layers you apply (more layers results in more distortion) and your gap during groove preparation (larger gap more distortion). In my opinion distortion for GMAW and FCAW will be less than for SMAW. If distortion is a big problem you also can apply so called high frequency hammering during welding in order to control distortion and shrinkage. Beginning this year I run a project for Linde Engineering Munich (Germany) in which we applied Pneumatic Impact Treatment during welding of repair welds executed in the shell of a large heat exchanger, whereas minimum shrinkage as possible was required in order to avoid residual stresses in the 12000 Titanium pipes of this heat exchanger.

 

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 purvin.bhatt@Linde-LE.com
Verzonden: woensdag 10 augustus 2011 10:33
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:12173] welding procedure for distortion control

 

Dear friends,

By adopting which welding procedure (SMAW/GMAW/FCAW) we can reduce distortion in structural welding


Regards,

Purvin Bhatt

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