00000nam 2200000za 4500 9.841304 CaOODSP 20221107152044 cr ||||||||||| 170809s1968 onc ob f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/99E-PDF M34-20/99 Winterton, K. Formulation and growth of present ideas on heat-affected-zone cracking [electronic resource] / K. Winterton, Physical Metallurgy Division. Ottawa : Queen's Printer, 1968. vi, 43 p. Technical bulletin ; TB 99 Cover title. "March 1968." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references (p. 26-30). “Heat-affected-zone cracking is a problem in the metal-arc welding of hardenable steels. Encountered first in welding armour, the problem has persisted because high strength is now demanded in steels for many purposes. There are four main factors responsible: a) The hardenability of the steel which depends on carbon and alloy content. b) The cooling rate in the joint which depends on heat input, thermal severity and ambient temperature. c) The hydrogen available in the heat-affected zone, most commonly derived from moisture in the electrode covering. d) Stresses built up in the joint because of thermal contractions. The origins of the salient ideas about the problem have been traced among the more important contributions to an abundant literature on the subject. The fairly obvious dangers of heat affected zone cracking are dealt with briefly. Methods of varying complexity, based mainly on the elimination of hydrogen and the control of heat input, are described for the prevention of heat-affected-zone cracking"--Abstract, p. i. Includes abstract in French. gccst Steel Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 99 (CaOODSP)9.834857 PDF 2.21 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-99-eng.pdf 299985