Accession Number : ADA187728

Title :   Reduction of Residual Stresses and Distortion in Girth Welded Pipes.

Descriptive Note : Master's thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING

Personal Author(s) : Barnes, Pamela K

PDF Url : ADA187728

Report Date : Jun 1987

Pagination or Media Count : 114

Abstract : Conventionally, welding control has been used to assure that the quality of the weld itself is maintained. Residual stresses and distortion result from the non-uniform temperature distribution which form the weld process. In this thesis, an investigation into the reduction of residual stresses and distortion is performed. Potential benefits of reducing these include prevention of stress corrosion cracking, fatigue, brittle fracture and collapse strength. In an attempt to reduce residual stresses and distortion, a hydraulic restraining device was designed, constructed and tested. It was then compared to several other methods being investigated. This hydraulic restraining device is very effective in reducing the radial contraction. Although it also reduces the residual stresses, it does not change them from tensile to compressive as some of the other methods do.

Descriptors :   *PIPES, *WELDS, BRITTLENESS, COLLAPSE, CONTRACTION, CONTROL, CRACKS, DISTORTION, DISTRIBUTION, FRACTURE(MECHANICS), NONUNIFORM, QUALITY, REDUCTION, RESIDUAL STRESS, RESTRAINT, STRENGTH(GENERAL), STRESS CORROSION, TEMPERATURE, WELDING, STRAIN(MECHANICS), HYDRAULIC EQUIPMENT, THESES

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE