Metallurgy of Basic Weld Metal by G. M. Evans, N. Bailey

By G. M. Evans, N. Bailey

This booklet describes the result of over twenty years of study accomplished this yr at one of many world's most advantageous consumable brands and aimed toward bettering the homes of MMA electrodes for top of the range functions. It examines the impression of a few 17 components and welding variables at the composition, microstructure and mechanical homes of the ensuing weld steel. the usually advanced relationships found are enough to provide an exceptional knowing of the houses of weld metals produced via different arc welding processes.

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19 (with carbon at the lowest level) shows some apparent discrepancies. Some of these can largely be resolved by taking account of the slight but systematic increase in carbon with manganese in the earlier series, use of a lower interpass temperature of 150 "C in the earlier series compared with 200 "C in the later series, and point counting the earlier results with a magnification of only x200. 4%Mn electrode. O6%C gave a useful increase in acicular ferrite. e. similar to those examined here, but with ultra low carbon contents) gave poor Charpy toughness values at -20 "C, even though the upper shelf values at ambient temperature were extremely good.

CEGB, Marchwood England, Sept 1972. 3 Evans GM: ‘Effect of carbon on the microstructure and properties of C-Mn all-weld-metal deposits’. Welding3 1983 62( 11) 313s-20s; Welding Res Abroad 1983 29( 1) 58-70; IIW Doc 11-983-82; Schweissmitteilungen 1982 40(99) 17-31. 4 Bailey N: ‘Bimodality revisited - split behaviour of weld metal’. T W I Res Bull 1991 32 110-15. 5 Carpenter H and Robertson JM: ‘Metals’. OUP, London, 1939, pp 1081-85. 6 Rees WP, Hopkins BE and Tipler HR ‘Tensile and impact properties of iron and some iron alloys of high purity’.

90 with no consistent pattern of variation. Ductility values fell only slightly with carbon within the range of C and Mn contents examined. = I I I n. E E .. O65%C - AS WELDED . a v1 W d 500 m ac 2 400 c 'd 3 - 300 Charpy I I I tests Transition curves are shown in Fig. 27. Although carbon appeared to increase energy levels at the lower shelf and decrease them on the upper shelf, it had little effect on transition temperatures, as exemplified by Fig. 28. 09% at intermediate levels. ,b -8, -10 40 ; ,b TEST TEMPERATURE , "C .

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