溶接学会論文集
Print ISSN : 0288-4771
Co基超合金レーザ溶接部の高温強度特性とレーザ表面溶融処理による改善
牧野 吉延本多 啓三木村 盛一郎
著者情報
ジャーナル フリー

1998 年 16 巻 4 号 p. 462-470

詳細
抄録

The high power CO2 laser utilizes widely for practical applications such as cutting and welding of metals because of its large scale of output power. However laser welding of superalloys which required a high quality and a high efficient welding, is rarely applied in practical use in the field of heavy industry. An ordinary laser welding of metals with filler wire produces the columnar structure which meets at the center of weld bead, so this leads to decrease of creep properties. At this point of view, we have developed to improve creep rupture behavior of joints by laser melting the surface of weld bead again. In this experiment, Co-base superalloy of less than 3 mm thickness was used as a base metal. The spot size of laser beam to irradiate on the first laser weld bead surface was approximately 3 mm. The depth of this surface melting layer was changed by traveling speed within this experiment. As a result, it was found that both its elongation and creep rupture life time after laser melted were improved to twice compared with as welded. The laser surface melting on laser welds of Co-base superalloy shows that the creep properties can be greatly improved by re-distribution of the boundary of the columnar structure.

著者関連情報
© 一般社団法人 溶接学会
前の記事 次の記事
feedback
Top