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Journal Articles

Improving fatigue performance of laser-welded 2024-T3 aluminum alloy using dry laser peening

Sano, Tomokazu*; Eimura, Takayuki*; Hirose, Akio*; Kawahito, Yosuke*; Katayama, Seiji*; Arakawa, Kazuto*; Masaki, Kiyotaka*; Shiro, Ayumi*; Shobu, Takahisa; Sano, Yuji*

Metals, 9(11), p.1192_1 - 1192_13, 2019/11

 Times Cited Count:2 Percentile:64.55(Materials Science, Multidisciplinary)

The purpose of the present study was to verify the effectiveness of dry laser peening (DryLP), which is the peening technique without a sacrificial overlay under atmospheric conditions using femtosecond laser pulses on the mechanical properties such as hardness, residual stress, and fatigue performance. After DryLP treatment of the laser-welded 2024 aluminum alloy, the softened weld metal recovered to the original hardness of base metal, while residual tensile stress in the weld metal and heat-affected zone changed to compressive stresses. The fatigue life almost doubled at a stress amplitude of 180 MPa and increased by a factor of more than 50 at 120 MPa. As a result, DryLP was found to be more effective for improving the fatigue performance of laser-welded aluminum specimens with welding defects at lower stress amplitudes.

Journal Articles

Mechanical properties of weldments using irradiated stainless steel welded by the laser method for ITER blanket replacement

Yamada, Hirokazu*; Kawamura, Hiroshi; Nagao, Yoshiharu; Takada, Fumiki; Kono, Wataru*

Journal of Nuclear Materials, 355(1-3), p.119 - 123, 2006/09

 Times Cited Count:2 Percentile:89.26(Materials Science, Multidisciplinary)

In this study, the bending properties of welding joint of irradiated material and un-irradiated material (irradiated/un-irradiated joints) were investigated using SS316LN-IG, which is the candidate material for the cooling pipe of ITER. The results of this study showed that the bending position of joints using un-irradiated material was un-irradiated part and that the bending position of irradiated/irradiated joints was fusion area or HAZ (heat affected zone). Although the bending position of joints was different bor the combination pattern between irradiated and un-irradiated materials, the bending strength of joint was almost same. Additionally, it is confirmed that bending strength did not depend on the combination pattern between the irradiated and un-irradiated materials, nor on the relationship between the heat input direction and the bending load direction.

Journal Articles

Development of in-pipe access welding and cutting tool using YAG laser

Oka, Kiyoshi; Tada, Eisuke; Kimura, Seiichiro*; Ogawa, Tadashi*; Sasaki, Nami*

High-power Lasers in Manufacturing (Proceedings of SPIE Vol.3888), p.702 - 709, 1999/11

no abstracts in English

JAEA Reports

Development of pipe welding, cutting & inspection tools for the ITER blanket

Oka, Kiyoshi; *; *; *; Takahashi, Hiroyuki*; Tada, Eisuke

JAERI-Tech 99-048, 222 Pages, 1999/07

JAERI-Tech-99-048.pdf:24.01MB

no abstracts in English

Journal Articles

Development of bore tools for pipe welding and cutting

Oka, Kiyoshi; *; *

J. Robot. Mechatron., 10(2), p.104 - 109, 1998/00

no abstracts in English

JAEA Reports

Development of remote bore tools for pipe welding/cutting by YAG laser

Oka, Kiyoshi; Nakahira, Masataka; Kakudate, Satoshi; Tada, Eisuke; Obara, Kenjiro; *; *

JAERI-Tech 96-035, 47 Pages, 1996/07

JAERI-Tech-96-035.pdf:3.17MB

no abstracts in English

JAEA Reports

Critical element development of standard components for pipe welding/cutting by CO$$_{2}$$ laser

Oka, Kiyoshi; Kakudate, Satoshi; Nakahira, Masataka; Tada, Eisuke; Obara, Kenjiro; *; *; *; Shibanuma, Kiyoshi; Seki, Masahiro

JAERI-Tech 94-033, 20 Pages, 1994/11

JAERI-Tech-94-033.pdf:1.25MB

no abstracts in English

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