Welding techniques for high alloy austenitic stainless steel

Book · Fri Nov 01 04:00:00 EST 1996

OSTI ID:382593

Gooch, T G; Woollin, P ^[1]

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1. TWI, Cambridge (United Kingdom)

Factors controlling corrosion resistance of weldments in high alloy austenitic stainless steel are described, with emphasis on microsegregation, intermetallic phase precipitation and nitrogen loss from the molten pool. The application is considered of a range of welding processes, both fusion and solid state. Autogenous fusion weldments have corrosion resistance below that of the parent, but low arc energy, high travel speed and use of N{sub 2}-bearing shielding gas are recommended for best properties. Conventional fusion welding practice is to use an overalloyed nickel-base filler metal to avoid preferential weld metal corrosion, and attention is given to the effects of consumable composition and level of weldpool dilution by base steel. With non-matching consumables, overall joint corrosion resistance may be limited by the presence of a fusion boundary unmixed zone: better performance may be obtained using solid state friction welding, given appropriate component geometry. Overall, the effects of welding on superaustenitic steels are understood, and the materials have given excellent service in welded fabrications. The paper summarizes recommendations on preferred welding procedure.

• OSTI ID: 382593
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARC WELDING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COBALT ALLOYS
COPPER ADDITIONS
CORROSION RESISTANCE
EXPERIMENTAL DATA
FRICTION WELDING
HEAT AFFECTED ZONE
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LASER WELDING
LIQUID METALS
MANGANESE ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ALLOYS
NITROGEN ADDITIONS
PRECIPITATION
RESISTANCE WELDING
SEGREGATION
TUNGSTEN ALLOYS
VANADIUM ADDITIONS
WELDING