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Abstract

A computer model for heat-affected zones (HAZs) for single-bead and multipass mechanized tungsten-inert-gas (TIG) weldments is described. The model is based on (i) semi-empirical correlations to describe the effects of major welding variables on the weld bead dimensions, (ii) classical heat flow to define the weld thermal cycle appropriate to the welding conditions and the component geometry, and (iii) basic metallurgy u:hich includes phase transformations, grain growth, and precipitate dissolution kinetics. The computer program used for this model has as its input basic welding-process information and material-property data, and as its output the spatial distribution of single and multipass HAZ structures as a graphic display. Experimental measurements carried out at GEC Turbine Generator Co. on a series of mechanized TIG single-weld beads and multipass weld deposits on mild steel plate have been used to show that the model predictions of weld-bead geometry and HAZ-structure distribution are valid over the range of welding conditions used.

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Computer model for predicting heat-affected-zone structures in mechanized tungsteninert gas weld deposits

Abstract

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