I agreed Sakori...
I have added just my exp. This is not rimmed/ killed steel pblm.
This is typical carbon/pearlitic segregation.
i have exp with SA 516 Gr.70 plates. we have done impact, tensile on particulor location in raw material stage. it was found to meet the specification.
your photo are seems to be minor. defenetly.. it will not lead to any crack.
However..it shld be communicated and eliminated frm supplier end.
Regards
Thiyagarajan M
Welding Metallurgist.
--Dear Meisam Shokri Arfaei
Many thanks for this information and for the macro. I am very keen to find obtain examples of case histories which I can show to colleagues so that they are aware that it is not a new problem, but so far I am not finding any information in the literature. Are you able to help here? If anyone knows of research into this I would be interested to hear – maybe someone's thesis?
Best wishes
Alan Denney
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of meisam shokri arfaei
Sent: 23 May 2015 11:41
To: materials-welding@googlegroups.com
Subject: Re: [MW:23024] Plates cracking down the centreline following welding
This is directly related to the quality of the base material. Lower quality plates (often rimmed or semi-killed) by means of more undesirable alloying elements which produce adverse intermetallics, carbides, sulfides and so on, are more sensitive to this cracking. If you cut a cross section of such plates and make a macrograph, these segregated phases in mid thickness of the plate are clearly visible. Increasing such segregation and undesirable elements and phases make the plate more susceptible to the cracking during welding.
I cut out this sample for weld macrograph but in the mid of both sides (more in the left side) the segregation is visible.
Also using high heat input during welding, using material with larger grain size and thicker materials could increase the chance of cracking in those low quality materials.
Regards
On Sat, May 23, 2015 at 1:51 PM, Alan Denney <alan@denney1.freeserve.co.uk> wrote:
What experience do members of the group have with steel plates cracking down the centreline following making of butt welds either side of the joint to the plate surface? [I am not talking about lamellar tearing – immediately sub-surface]. I am interested in your experience of this, what you considered the reasons to be and if you know or have any published information.
Alan Denney
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M. Shokri Arfaei
ISA-ISTS - Metallurgy Lab. Manager
ASNT NDT Level III
International Welding Engineer
Tel.: +98 21 66282127
Fax: +98 21 66282779
Mob.:+98 912 1394023
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