Since material is with 80 Ksi minimum, 70Ksi may not match. Being Q&T steel, control the heat input to get Impact values
THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY
On Wed, Jun 18, 2014 at 7:22 AM, Mahendra Arya <mkarya.delhi@gmail.com> wrote:
Electrode E8018-c2
Gtaw wire ER80SNi2
Saw ENi1+UV418TT
On 18-Jun-2014 2:41 am, "'GANESH GANESH' via Materials & Welding" <materials-welding@googlegroups.com> wrote:--
Hi,
Proposed consumable for SA537 Cl2 Material by supplier is as below, whether it is acceptable(service impact -34C, With out PWHT, ASME Div II vessel/ Thk 34/36 mm)
GTAW ER70S2
SMAW E7018-1
SAW F7A8/P8 EH12K
Supplier advised to purchase with required mechanical properties meeting base metal requirments for consumbales.
But the chemistry requirments for GTAW/SMAW, more or less match ,but for SAW it doesn't match for micro alloys(Ni/Cr/Mo)
Whether proposed consumable is ok or thier any other alterations.
Ganesh
--------------------------------------------
On Tue, 17/6/14, pgoswami <pgoswami@quickclic.net> wrote:
Subject: RE: [MW:21145] Reasons for High Hardness on WM and HAZ
To: materials-welding@googlegroups.com
Cc: perumalgovindan@gmail.com
Date: Tuesday, 17 June, 2014, 8:38 AM
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Hi
Govindan,
Why did you choose E
8018-C3 electrode for SA 537 Cl1 plates. SA 537 Cl1 is
almost back to back to SA
515 Gr70 Steel. Based on the impact requirement as
indicated below,
E-7018-1 would have been appropriate. I would say that
E 8018-C3 would
have been advisable if the welds would have undergone
enhanced heat treatment
e.g Normalizing.
The high hardness in the
weld and HAZ is due to the use of overalloyed electrode
.E-8018C3/Tenacito 70
contains typically 1.005 Nickel.Nickel causes to form
acicular ferrite in the
weld/HAZ , which in turn causes higher
hardness.
Thanks
Pradip
Goswami, P.Eng,IWE
Welding &
Metallurgical Specialist
Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
pradip_goswami@yahoo.ca
Date: Mon, 16 Jun 2014 20:22:33 +0530
Subject: [MW:21143] Reasons for High
Hardness on WM and HAZ
From: perumalgovindan@gmail.com
To:
materials-welding@googlegroups.com
Dear Experts,
We have conducted PQR and measured the hardness values
between 248 HV to
269 HV:
Material Specification and
Parameters:
Material Specification: ASTM A537
Class 1,Plate 12.8 mm
thickness, SMAW process, 4G position
Electrode Used: AWS / SFA: 5.5, E
8018-C3, Brand Name:
TENALLOY-70/ADOR welding limited.
Electrode baking Temp.: 350 deg. C for 2 hours
Electrode Holding temp.: 150 deg. C
Preheat: Ambient temperature (surrounding temp. was 40
deg.
Centigrade)
Interpass temp.: 150 deg. C to 185 deg.C
Travel Speed: 70 to 80 mm/min
Voltage: 20 to 24V
Current: 70 to 79A
Heat input: 1.45 KJ/mm to 2.27 KJ/mm
Lab test
Results:
UTS: 571 MPa
Bend test; Accepted
Impact test at 0 deg. C:WM -
Average 102J and HAZ:
234J
Hardness Value:
248HV to 269HV.
Request to
provide the reasons for high
hardness
--
Thank You and Regards
P Govindan
Mobile: +919643152414
Direct : +911294291200
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