Abstract
This paper describes local stress relief heat treatment for butt-joints of a 5083-O plate. The following results were obtained by experiments.
(1) In order to relieve the residual stress at a butt-joint, the region of the maximum stress had to be heated at least above 150°C. For relaxing it to about half a degree of as-welded state, the heating had to be above 250°C and for virtually relieving it, the heating above 350°C was needed.
(2) Among three heating methods in these experiment, the best results were obtained by the heating method of reciprocation. The results of one or two-point heating method were inferior to those of the above method.
(3) The degree of stress relief annealing tended to be similar to the reduction in high temperature tensile strength of the base metal rather than its yield strength.
