Electron beam welding produces improved duplex crack arrest specimens
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
- Resource Relation:
- Conference: ASM/EWI power beam conference, San Diego, CA, USA, 1 May 1988
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of irradiation on initiation and crack-arrest toughness of two high-copper welds and on stainless steel cladding
The structural significance of HAZ sigma phase formation in welded 25%Cr super duplex pipework