Experimental Evaluation of Residual Stresses in a Weld Clad Plate and Clad Test Specimens.

摘要

An experimental residual stress analysis of a weld clad plate was conducted. The plate was 114-mm thick, including cladding on the top and bottom surfaces. The cladding involved a three-wire process using combinations of 308 and 304 stainless steel to simulate the practice used for early nuclear vessel construction. The experimental procedure involved monitoring strain gages before and after parting out a section of the plate, splitting this piece five times, and removing layers from each piece. Residual stress distributions were evaluated at various locations based on the strain gage readings and the geometry of the specimen. High tensile residual stresses were found in the clad material. In addition to the weld clad plate, an experimental residual stress analysis was done for two clad test specimen geometries that were cut from the plate. The part of the study indicated that removing a specimen with cladding on one side reduced the residual stress in the cladding while reducing the thickness of the cladding tends to increase the residual stresses in the remaining cladding. A comparison of experimentally obtained residual stress distributions and values calculated with a finite-element model showed good agreement.