Transient thermal stresses of weld heat-affected zones were evaluated by a rigid frame apparatus as shown in Fig. 1 . Round bar specimens set into the rigid frame were put to thermal cycles by induction heating and transient thermal stresses were recorded on the oscillograph connected to the loadcell. Four kinds of steel of different mechanical and metallurgical properties were used. The types of applied thermal cycle were single thermal cycle, multi thermal cycles of constant peak temperature

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... ype, increasing-or decreasing-peak temperature type (see Figs. 11 a, b). Test results of the transient thermal stress as a function of temperature are shown in Figs. 6 thru 9, Figs. 12 thru 16, Figs. 18 and 19. Residual stresses as a function of peak temperature applied are shown in Fig. 10 for single thermal cycles and in Fig. 17 for multi thermal cycles. The transient thermal stresses and residual stresses are influenced by the mechanical and metallurgical properties of steels used.