Dear All,
In some welding processes such as CRC welding /Narrow gap welding it is even difficult to identify the HAZ and it becomes it very important to use hardness testing and we need to use HV 5 instead of HV 10 in order to determine hardness in HAZ which is more critical in case of low heat input welding process ( ref EPC 16 publication ).
Best Regards,
Francis lobo
----- Original Message -----
From: Bathula Raghuram (Mumbai - PIPING)
To: materials-welding@googlegroups.com
Sent: Tue, 28 Oct 2008 19:12:18 +0530 (IST)
Subject: [MW:1255] RE: 1253] RE: 1250] Re: HAZ
zone. This is ASME SA106 Grade B steel pipe NPS 2.5 SCH 80 with J-grooved
prepared ends. An automated TIG orbital welder made half an orbit before
aborting. The heat affected zone is clearly visible because of the polished
ends, even though it is generally inoccuous in this material. (SA106 Grade B)
Photo by Yannick Trottier, 2006.
-----Original Message-----
From:
materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com]On Behalf Of
CKPurohit
Sent: Tuesday, October 28, 2008 9:57 AM
To:
materials-welding@googlegroups.com
Subject: [MW:1253] RE: 1250] Re:
HAZ
Dear
Shailesh,
As
everybody informed that HAZ is largely depend on the process and other
parameter is correct but my experience HAZ in manual welding is less than 3 mm
and Auto (SAW and other high heat input process) it will be less than 5 mm for
carbon steel and LAS. For SS I have not observed HAZ bigger than 1 mm (we can
see after etching too).
I
hope experienced people like Mr Kalayan can comment on statement as he might
have seen many cross section HAZ after etching…..
Regards.
C.
K. Purohit
General
Manager
QA
/ QC / WELDING / NDT / R&D
KNM
Process Systems Sdn Bhd - Malaysia
HP
- +6016 337 6448
From:
materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
On Behalf Of Kalyan Elcalabs
Sent: Sel, 28 Okt 08 02:42
pm
To: materials-welding@googlegroups.com
Subject:
[MW:1250] Re: HAZ
Dear
Shailesh,
There is no thumb
rule for the formation of HAZ. This largely depends on welding procedure,
equipment used, various consumables, electrical parameters,
operators skill and the uncertainities contributed by them. Normally one
should expect minimum HAZ as is it not a desirable phenomena in any welding
process.
N.
Kalyan.
ELCA
Laboratories.
----- Original
Message -----
Sent: Monday, October
27, 2008 6:53 PM
Subject: [MW:1247] Re:
HAZ
DEAR SACHIN,
LET ME MAKE MY QUESTION CLEAR TO YOU. FROM WELD
JOINT END HOW MUCH IS THE WIDTH OF HAZ.
REGARDS,
From: sachin sankhe
<sachin.sankhe@rediffmail.com>
Subject:
[MW:1246] Re: HAZ
To: materials-welding@googlegroups.com
Date:
Monday, October 27, 2008, 5:34 PM
Hi Shailesh
Your question is not
clear
Regards
Sachin
On Sat, 25 Oct 2008 shailesh
dave wrote :
>DEAR MEMBERS,
>
>WOULD YOU PLEASE
TELL ME WHAT COULD ME THE THUMB RULE FOR HEAT AFFECTD ZONE DURING
WELDING.
>
>REGARDS,
>
>S.N.DAVE
>I/C
QA/QC DAS ISLAND UAE
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