Accession Number : ADA956104

Title :   Prediction and Control of Residual Stresses and Distortion in HY-130 Thick Pipe Weldments.

Descriptive Note : Master's thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Mabry, John P.

Report Date : MAY 1979

Pagination or Media Count : 130

Abstract : In order to validate existing techniques for computer simulation of the welding process, an experiment is designed and carried out in which seam and girth welds are produced on a high strength steel cylinder. Fabrication of the HY-130 cylinder, selection of welding parameters for the seam and girth welds, and the selection and arrangement of instrumentation are described. The theoretical background of finite element computer simulation of heat flow in weldments as well as techniques for axisymmetric finite element analysis of thermal stress and metal movement during welding are discussed. Finite element representation of weldment geometry for heat flow and stress analysis is presented. Metallurgical properties of the HY-130 cylinder seam weld are presented in the form of photo-micrographs and electron scan micrographs. Temperature, strain, and radial distortion are measured at various locations on the HY-130 cylinder and the measured values are compared.

Descriptors :   *WELDING, *COMPUTERIZED SIMULATION, AXISYMMETRIC, BACKGROUND, COMPUTERS, DISTORTION, ELECTRONS, FABRICATION, FINITE ELEMENT ANALYSIS, FLOW, GEOMETRY, HEAT, HEAT TRANSMISSION, HIGH STRENGTH, INSTRUMENTATION, METALS, PARAMETERS, SELECTION, SIMULATION, STEEL, STRESS ANALYSIS, TEMPERATURE, VALUE, WELDMENTS, WELDS, THESES.

Subject Categories : Fabrication Metallurgy
      Computer Programming and Software
      Thermodynamics
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE