Pre Heat and SR-reg

[Kannayeram Gnanapandithan]

Tube matl---SA213 T 91

  Size----------44.5 X 4.5mm thick

Stud matl------ SS 304

  Size-------------Dia 6mm and length 12mm

Welding process---- Drawn Arc Stud welding

Question--- 1. Whether base material is to be Preheated or Not

                    2. Stress Relieving is required or Not. 

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

[Karthik]

Hi,

For T91 welds, preheat is mandatory but the thickness is 4.5mm then you can reduce the preheat to 150 degrees if it is done by GTAW or other wisw minimum preheat shall be 204 degrees.When welding T91 to Stainless steel interpass temperature shall maintained in between 165 to 222 degree celsius. After weding it shall be sooled down slowly to 95 degrees and keep it for an hour and to ambient.

For alloy 91 to stainless steel material welds, PWHT performed with temperature 732 degrees plus or minus 14 degrees.

 

Thanks& Regards,

 

(Karthik)

QA/QC Manager 
CMI-Thai Services Co.,Ltd. 
50/35 Sermsuwan Road,Tambol Maptaphut 
Amphur Muang Rayong,Rayong 21150

Thailand
www.cmi-services.com 
Tel : +66 38 691 390-2 ext.103 
Fax : +66 38 682 338 
Mobile: +66 892512282 
E-mail : karth...@cmi-services.com

               Karth...@yahoo.com

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