Abstract
A simple test procedure for the estimation of two new ductile fracture toughness parameters has been applied for optimising the postweld heat treatment temperature for the Alloy 800/2·25Cr–1Mo steel dissimilar metal weld joint. The test procedure exploits the conventional tension test at room temperature using smooth round transverse weld specimens to evaluate the new toughness parameters for the weakest region of the joint. It is demonstrated that the optimum postweld heat treatment temperature determined via this new approach is identical to that determined from a previous investigation where the conventional method of correlating the microstructure and microhardness profiles with the conventional tensile properties at 773 K had been used.MST/1803
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