To form a weld joint having a sufficiently high fracture toughness value δc by butt-welding a high-strength steel sheet for electron beam welding, which has yield strength of ≥355 MPa class and has a sheet thickness of >50 mm.
The electron beam weld joint with excellent resistance to generation of brittle fracture is a butt-weld joint of a welded structure, which has the following characteristics: (a) the hardness of a weld metal part is ≥110 and ≤220% of that of a base material; and (d) the prior austenite grain size of a weld heat-affected zone (HAZ) which is in contact with a weld fusion line is ≤100 μm; if necessary, (b) the width of the weld metal part is ≤20% of the sheet thickness of the base material; and/or (c) the width of the region of the weld heat-affected zone, which is softened to hardness of ≤95% that of the base material not affected by heat, is ≥3 mm.
| JPS5921486 | ELECTRON BEAM WELDING DEVICE |
| JPS61238479 | ELECTRON BEAM WELDING METHOD |
HONMA RYUICHI
KOJIMA AKIHIKO
YOSHIDA YUZURU
TANAKA YOICHI
| JP2001131679A | 2001-05-15 | |||
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| JP2005144552A | 2005-06-09 | |||
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| JPH08277440A | 1996-10-22 | |||
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Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu