Petrochemical industry guidelines for controlled repair welding of chrome-moly components

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Bulletin - Welding Research Council

OSTI ID:471164

Hammond, J; Dennis, R A

The development of controlled deposition repair welding procedures for 2{1/4}Cr-1Mo and 1{1/4}Cr-{1/2}Mo steels without postweld heat treatment has been made possible as the result of two joint industry programs at EWI/TWI and other research work. In the United States, Section RD (Repair Methods) of the 1995 edition of the National Board Inspection Code (NBIC) rules has given guidance on some areas where such repair techniques might be permitted and equally some specific items on which such repairs must clearly not be attempted. The Cr-Mo heat-resisting steels are not tolerant materials in the context of welding without subsequent thermal treatment. Therefore, repairs to existing Cr-Mo pressure vessels, heat exchangers, and piping can be made only after detailed consideration of all relevant factors including, but not limited to: Material composition and product form; age and thermal history of the component to be repaired; metallurgical condition of the plant item at operating temperature and normal ambient temperature; estimated stresses acting on the component, including residual stress; evaluation of the environment in which the repaired plant will operate after repair.

• OSTI ID: 471164
• Journal Information: Bulletin - Welding Research Council, Journal Name: Bulletin - Welding Research Council Journal Issue: 412; ISSN 0043-2326; ISSN WRCBA2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
PETROLEUM INDUSTRY
RECOMMENDATIONS
REPAIR
STANDARDS
STEEL-CR2MO
STEEL-CRMO
WELDING