Electron beam welding produces improved duplex crack arrest specimens

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6842169

King, J F; Hudson, J D

The crack arrest toughness, K/sub Ia/, is generally determined using a monolithic compact type specimen which contains a brittle weld bead to act as a crack initiation site. To test at higher temperatures and toughnesses, electron beam (EB) welded duplex specimens were fabricated. These specimens required the joining of hardened 4340 steel, which acts as the crack initiator, to A533 grade B class 1 steel base material and submerged arc welds in this base metal. The successful fabrication of these specimens required the development of an EB welding procedure with a very narrow heat-affected zone (HAZ). A technique was also developed to eliminate the porosity which was always present in the EB welds through the submerged arc weld deposit region of the joint. The technique involved remelting the joint surface of the A533 steel containing the submerged arc weld to a controlled depth using an oscillated electron beam. This remelt in vacuum reduced the gaseous constituents to low levels and prevented porosity from forming in the deep penetration EB welds between this surface and the 4340 steel.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6842169
• Report Number(s): CONF-880547-3; ON: DE88003885
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
ALLOYS
ELECTRON BEAM WELDING
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS TESTING
STEELS
TESTING
WELDING