Fracture behaviour of large diameter pipeline girth welds: Effect of weld metal yield strength. Part 1, final report

Technical Report · Sun Feb 09 04:00:00 EST 1992

OSTI ID:6877387

Denys, R. M. ^[1]

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1. Ghent Rijksuiversiteit (Belgium). Lab. Soete

This report describes the results of an experimental investigation into the failure behaviour of defected girth welds in large diameter line pipes. The focal point of the evaluations was the study of the weld metal yield strength matching effects on weld metal root crack tolerance. The objectives were achieved by testing six girth welds in API 5LX65 pipe sections of 916 mm (36 in.) in diameter with a 25,4 mm (1 in.) wall thickness. The girth welds were made with 90 ks (E9010-G) tensile strength -low toughness- cellulosic electrodes. This electrode was chosen to obtain weld deposit yield strength overmatching. The experimental programme was divided into two parts. In the first part of the programme, a series of tensile and conventional toughness small scale Charpy V notch impact and CLOD tests were conducted, whereas in the second part, fatigue pre-cracked wide plate specimens were tested to assess their failure behaviour in terms of defect size. In addition, the prediction capability of girth veld defect acceptance criteria based on fracture mechanics and plastic collapse principles vas assessed.

• Research Organization: American Gas Association, Inc., Arlington, VA (United States). Pipeline Research Committee; Ghent Rijksuiversiteit (Belgium). Lab. Soete
• Sponsoring Organization: American Gas Association, Inc., Arlington, VA (United States)
• OSTI ID: 6877387
• Report Number(s): AGA-93007102; CNN: PR-202-011
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000* -- Natural Gas-- Transport
Handling
& Storage
42 ENGINEERING
420500 -- Engineering-- Materials Testing
CHARPY TEST
DEFECTS
DESTRUCTIVE TESTING
DOCUMENT TYPES
ENERGY SOURCES
FABRICATION
FLUIDS
FOSSIL FUELS
FRACTURE MECHANICS
FRACTURE PROPERTIES
FUEL GAS
FUELS
GAS FUELS
GASES
IMPACT TESTS
JOINING
JOINTS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MECHANICS
NATURAL GAS
PIPELINES
PIPES
PROGRESS REPORT
TENSILE PROPERTIES
TESTING
WELDED JOINTS
WELDING
YIELD STRENGTH