The effect of prior cold work on the pressure welding of ferritic nodular iron

Author

Ronald Morris Ledbetter

Abstract

"The purpose of this investigation was to determine the effect of prior cold work by swaging on the pressure welding of ferritic nodular iron. Test pressure welds were produced from continuously cast ferritic nodular iron in the as cast condition and with prior cold work of 20, 30, 40, and 50 per cent reductions in area. Welding pressures of 23,500 psi, 35,300 psi, and 47,100 psi were employed. All welds were made at interface temperatures of 2000°F. Welds made with the as cast material at high welding pressures possessed relatively low tensile strengths due to the creation of planes of weakness caused by transverse elongation of graphite nodule sites near the weld interface. The prior cold work longitudinally elongated the graphite nodule sites, which opposed the transverse site elongation during subsequent welding. As a result, the nodule sites became more spheroidal in shape and no planes of weakness were created. At all amounts of prior cold work investigated, tensile failure occurred in the material not affected by welding deformation and strengths greater than the as cast nodular iron were obtained. The optimum welding parameters studied were a prior cold work of 30 per cent reduction in area, a welding pressure of 47,100 psi and a welding temperature of 2000°F. Welds made with greater percentages of reduction in area retained some residual longitudinal nodule site elongation in the deformation affected zone"--Abstract, page ii-iii.

Advisor(s)

Wolf, Robert V., 1929-1999

Committee Member(s)

Leighly, Hollis P., 1923-2004
Moore, Robert E., 1930-2003

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1968

Pagination

viii, 45 pages

Note about bibliography

Includes bibliographical references (page 105).

Rights

© 1968 Ronald M. Ledbetter, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Pressure weldingCold weldingIron, NodularFracture mechanics -- Testing

Thesis Number

T 2156

Print OCLC #

5999657

Electronic OCLC #

835137483

Recommended Citation

Ledbetter, Ronald Morris, "The effect of prior cold work on the pressure welding of ferritic nodular iron" (1968). Masters Theses. 6995.
https://scholarsmine.mst.edu/masters_theses/6995