JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
A Study on Hot Cracking by a Synthetic Test for Weld Thermal Cycle
Hiroshi TamuraNoboru KatoMasami ManabeMutsuhiko Yamaji
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1969 Volume 38 Issue 10 Pages 1124-1133

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Abstract

Using a new apparatus which can restrict the expansion and contraction of a synthetic specimen at an arbitrary temperature during thermal cycles, the hot cracking tendency of weld HAZ was examined on three high strength steels. The main results are summarized as follows:
(1) In a test steel Z(HY-130 class), hot cracks occurred in the condition that a synthetic specimen was heated to above 1, 350°C and was restrained within the temperature range of 1, 350 to 1, 380°C.
(2) Hot cracks were found in grain boundaries extremely coarsened by weld thermal cycles, which showed mostly white, relatively broad networks, so-called "heavy boundaries".
(3) By an electon-probe microanalysis, an enrichment with many elements was observed such as Ni, Cr, Si and P, and Mn and S locally on heavy boundaries.

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