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Prediction of welding thermal history by a comprehensive solution

1993; American Welding Society; Volume: 72; Issue: 3 Linguagem: Inglês

2689-0445

Tadashi Kasuya, Nobutaka Yurioka,

Thermography and Photoacoustic Techniques

A comprehensive solution has been developed to examine heat conduction in three different welding cases. Case 1 is a quasi-steady-state model to predict the shape of the heat-affected zone (HAZ), and the thermal histories and cooling times between 800 and 500 C (t[sub 8/5]) in wide plates. Case 2 is an instantaneous heat source model to predict cooling time from solidification to 100 C (t[sub 100]) in small test pieces. Case 3 is an unsteady heat model to predict t[sub 100]s in locally preheated plates. Rosenthal's and Tanaka's formulas can be derived from a solution of Case 1. These three cases were applied to the predictions of thermal histories, cooling times and HAZ shapes. The calculated results have been compared with the experimental results of several different cases of arc welding and good agreement has resulted.