Higher strength SMAW filler metals. Final report

Technical Report · Fri Dec 31 00:00:00 EST 1993

OSTI ID:10169191

Patchett, B M; Bicknell, A C ^[1]

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1. Alberta Univ., Edmonton, AB (Canada)

Electrodes for the SMAW (Shielded Metal Arc Welding) process have been developed for welding high-strength pipeline steels by using core wires made from high-strength microalloyed skelp extruded the cellulosic (Exx10) and low hydrogen (Exx16) flux coatings. The required alloy elements for high-strength deposits were therefore obtained from the core wire and not ferroalloy powders added to the flux, as is standard industrial practice. The idea behind this change was twofold: to avoid the possibility of introducing impurities from the varying sources of ferroalloy powders, including oxygen from the oxidized powder surfaces, and also to provide a closer match of the microalloy level to modern pipeline steel chemistries. The unknowns in this work were the effects of lower impurities/similar alloy content on the mechanical properties in the cast microstructure of a weld, compared to a pipe, and of the effect on electrode welding behavior of a flux containing no ferro powders other than FeSi. The results show that welds of very high strength and adequate toughness to pass typical pipeline specifications can be obtained from both types of electrode flux coatings. The Exx10 electrodes produced E8010 strength levels, while the Exx16 types produced E9016 deposits. All three Exx10 deposits passed a 27J at {minus}5C Charpy criterion, while of the Exx16 deposits, one passed a 27J at {minus}45 C Charpy criterion. This was accomplished with no attempts at optimizing the welding procedural conditions, and despite the fact that the Exx10 electrodes lost significant quantities of Mn during deposition.

• Research Organization: American Gas Association, Inc., Arlington, VA (United States); Alberta Univ., Edmonton, AB (Canada)
• Sponsoring Organization: American Gas Association, Inc., Arlington, VA (United States)
• OSTI ID: 10169191
• Report Number(s): AGA-94015628; ON: UN94015628; CNN: PR-152-012; TRN: AHC29416%%58
• Resource Relation: Other Information: PBD: 31 Dec 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
03 NATURAL GAS
42 ENGINEERING
PIPELINES
SHIELDED METAL-ARC WELDING
WELDED JOINTS
MECHANICAL PROPERTIES
LOW ALLOY STEELS
WELDING RODS
FILLER METALS
WELDING FLUXES
MECHANICAL TESTS
HEAT AFFECTED ZONE
METALLOGRAPHY
TENSILE PROPERTIES
FRACTOGRAPHY
EXPERIMENTAL DATA
MANGANESE STEELS
360101
360103
032000
420205
PREPARATION AND FABRICATION
TRANSPORT, HANDLING, AND STORAGE
TRANSPORT AND STORAGE FACILITIES