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
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