The Paton Welding Journal, 2003, №10

2003 №10 (03)

2003 №10 (05)

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The Paton Welding Journal, 2003, #10-11, 31-37 pages

Developments in property predictions for weld metal

D.L. Olson¹, E. Metzbower², S. Liu¹, Y.D. Park¹

¹Colorado School of Mines, Golden, USA
²U.S. Naval Research Laboratory, Washington, D.C., USA

Abstract
With the introduction of higher strength low-carbon steels, which have properties that are based on strengthening mechanisms other than the austenitic decomposition, new predictive expressions are required. As new welding processes increase productivity, it also becomes essential to present the cooling rate, At8/5, into predictive expressions. Furthermore, the oxygen content must be included to make these expressions useful in predicting weld metal properties. In addition to the elemental consideration, influences from solidification and second phase particles, such as inclusions, affecting the weld metal solid-state transformation reactions are discussed. Empirical expressions have been developed to predict hardness, yield and ultimate tensile strength, as well as ductility and toughness for low-carbon and low-alloy higher strength steel weld metal. The difficulty introduced by multiple pass welding on weld property predictions is recognized. Various approaches, based on either deterministic analyses with numerical calculations or experimental correlations have been attempted, and these approaches are also discussed. With the availability of new analytical approaches, such a neural net regression analysis, more rapid and compatible selection of the welding consumable composition for a specific alloy and welding thermal experience can be achieved.
Keywords: arc welding, high-strength steels, weld metal, carbon equivalent, oxygen, crystallization, thermal effect, multipass welds, isothermal diagrams, prediction of properties

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Suggested Citation

D.L. Olson, E. Metzbower, S. Liu, Y.D. Park (2003) Developments in property predictions for weld metal. The Paton Welding J., 10, 31-37.

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