Dear Aly,
E9018-G very well acceptable for welding with NR+SR for material grade SA516 Gr. 60. Based on your previous mails, it is not necessarily that all times the chemistry of filler metal should match with base materials. It may change based on other conditions such as NR.
It is understand that if CS weld undergoes heat treatment with above critical temperature (NR), there is a fall in tensile strength would take plate due to coarse grain formation of dendrite structure of the weld. This is depends on NR temperature and duration. But in any case there will be a reduction in tensile strength approximately 10-15 Ksi (100 N/mm2) in welds when compared with as welded condition. However, this will not be happened in base materials, since the metallurgical structure is different than the weld due to chemical composition with addition of some amount of alloying elements. See the attached article (Table 4 – CMn welds) would provide more details on this subject. Also refer to "Metallurgy of basic weld metal" by Evans for more details.
Hence to compensate the fall in strength after NR, we should select higher strength filler metal to achieve the strength requirements. Ideally it is preferred to use with "M" grade (Military) filler metals for welds with NR+SR. However, the filler metal used by the vessel vendor is acceptable.
Regards,
Prabhu.
On Tue, 24 Aug 2010 11:22:02 +0530 wrote
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>
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From: Raghuram Bathula
>To: materials-welding@googlegroups.com
>Sent: Tue, August 24, 2010 8:42:39 AM
>Subject: Re: [MW:6672] What is the Filler metal to weld Base metal (SA516 Gr 60) to achieve weld metal tensile properties after Normalization+ Stress Relieving
>
>yes, it is acceptable, you can select higher metallurgy to get desired mech properties, as long as no restriction w.r.tcorrosivenessof the fluid.
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Dear Mr. Karthik / Raghuram bathulaMy Question is whether thefiller metal(SMAW with E9018-G; SFA 5.5; A=10; F no. 4 & SAW with F9P6 EG F3; SFA 5.23; A=10; F no. 6)is acceptable to the base metal (SA516 Gr 60) as weld metal chemical properties(C=0.06%, Mn=1.37%, Si=0.24%, S% <0.005, P=0.014%, Mo=0.48%, Ni=0.82%, Cu=0.13%.) are not meeting theSA516 Gr60requirements.AlyKuwait
>
>
From: Karthik <karthik6684@yahoo.com>
>To: materials-welding@googlegroups.com
>Sent: Tue, August 24, 2010 7:32:00 AM
>Subject: Re: [MW:6667] What is the Filler metal to weld Base metal (SA516 Gr 60) to achieve weld metal tensile properties after Normalization+ Stress Relieving
>
>
QW-403.5
Welding procedure specifications shall bequalified using one of the following:
(a)
the same base metal (including type or grade) to beused in production welding
(b)
for ferrous materials, a base metal listed in the sameP-Number Group Number in table QW/QB-422 as the base
metal to be used in production welding
(c)
for nonferrous materials, a base metal listed withthe same P-Number UNS Number in table QW/QB-422
as the base metal to be used in production welding
For ferrous materials in table QW/QB-422, a procedure
qualification shall be made for each P-Number Group Number
combination of base metals, even though procedure
qualification tests have been made for each of the two
base metals welded to itself. If, however, two or more
qualification records have the same essential and supplementary
essential variables, except that the base metals
are assigned to different Group Numbers within the same
P-Number, then the combination of base metals is also
qualified. In addition, when base metals of two different
P-Number Group Number combinations are qualified using
a single test coupon, that coupon qualifies the welding of
those two P-Number Group Numbers to themselves as well
as to each other using the variables qualified.
This variable does not apply when impact testing ofthe heat-affected zone is not required by other Sections.
>So,If impact testing is required in your case,your contractor shall do supporting PQR with the actual production material (SA516 Gr.60) otherwise the exising WPS and PQR of your contarctor is acceptable.Thanks & Regards,(karthik)
>
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>--- On Tue, 8/24/10, Aly <mhaskar.aly@gmail.com> wrote:
>
>From: Aly <mhaskar.aly@gmail.com>
>Subject: [MW:6663] What is the Filler metal to weld Base metal (SA516 Gr 60) to achieve weld metal tensile properties after Normalization+ Stress Relieving
>To: materials-welding@googlegroups.com
>Date: Tuesday, August 24, 2010, 1:51 AM
>
>
> --
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>The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>
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To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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