RE: [MW:23029] Plates cracking down the centreline following welding

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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