There is always a HAZ. in ASS the HAZ is not hardened
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: "'c sridhar' via Materials & Welding" [materials-welding@googlegroups.com]
Sent: 06/15/2014 10:16 AM ZE8
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Subject: Re: [MW:21122] No Pre heat on Stainless steel
Don' call it as HAZ. Mentioned by oversight. Say it is either side of weld.
C Sridhar.
From: kannayeram gnanapandithan <kgpandithan@gmail.com>
To: materials-welding <materials-welding@googlegroups.com>
Sent: Saturday, 14 June 2014 9:27 AM
Subject: Re: [MW:21106] No Pre heat on Stainless steel
In ASS, hope that there is no HAZ??
THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY
On Fri, Jun 13, 2014 at 11:41 PM, 'c sridhar' via Materials & Welding <materials-welding@googlegroups.com> wrote:
--Further, SS requires a very low heat input compared to welding of CS, AS, Al, Cu etc.i.e. welding current. used for SS should be app. 20 to 25% less than what has beenrecommended for above metals.The weld, HAZ area should always show a golden yellow, pale straw or a half whitecolour. It should never be light or dark blue, or brownish.That will indicate depletion of Chromium in the form of Chromium oxide formationand vulnerable for inter granular corrosion.As our friend has said, due to higher thermal expansion, tack welding should be done atclose intervals i.e., with 25 to 40 mm gap to avoid waviness /distortion during welding.The root gap should be 3.00 mm or so to avoid lack of root penetration defect.
C Sridhar.
From: 'prem_nautiyal26' via Materials & Welding <materials-welding@googlegroups.com>
To: Vadivel Mahadevan <vadivelmahadev@gmail.com>; materials-welding@googlegroups.com
Sent: Wednesday, 11 June 2014 8:42 PM
Subject: Re: [MW:21088] No Pre heat on Stainless steel
--Austenitic stainless steels have a higher coefficient of thermal expansion (cause more distortion) and low thermal conductivity (retain heat for longer time).Hence not preheated.RegardsPrem Nautiyal9769316004Sent from Samsung Mobile-------- Original message --------From: Vadivel MahadevanDate:11/06/2014 18:21 (GMT+05:30)Subject: [MW:21078] No Pre heat on Stainless steel--Dear Experts,I know that Pre heat is not required for Stainless steel grade, but doesn't know why it is not required.Gentle men, can you please explain the funda behind it..RegardsVadivel. M
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