低変態温度溶接材料を用いた伸長ビード溶接による疲労寿命延伸効果に関する一考察

松崎 拓也; 村川 英一; 麻 寧緒; 堤 成一郎; 平岡 和雄; 大沢 直樹; 岡田 公一; 谷野 忠和; 志賀 千晃; 矢島 浩

doi:10.11181/hpi.58.22

Original Paper

A Study on Fatigue Life Improvement of Welded Joints using Elongated Bead Welding with Low Transformation Temperature Welding Material

Takuya MATSUZAKI, Hidekazu MURAKAWA, Ninshu MA, Seiichiro TSUTSUMI, Kazuo HIRAOKA, Naoki OSAWA, Koichi OKADA, Tadakazu TANINO, Chiaki SHIGA, Hiroshi YAJIMA

Author information

Takuya MATSUZAKI [Japan]
Sanwa Dock Co., Ltd [Japan]
Hidekazu MURAKAWA [Japan]
Joining and Welding Research Institute, Osaka University [Japan]
Ninshu MA
Joining and Welding Research Institute, Osaka University [Japan]
Seiichiro TSUTSUMI [Japan]
Joining and Welding Research Institute, Osaka University [Japan]
Kazuo HIRAOKA [Japan]
Joining and Welding Research Institute, Osaka University [Japan]
Naoki OSAWA [Japan]
Graduate School of Engineering, Osaka University [Japan]
Koichi OKADA [Japan]
Graduate School of Engineering, Nagasaki Institute of Applied Science [Japan]
Tadakazu TANINO [Japan]
National Institute of Technology, Kurume College [Japan]
Chiaki SHIGA [Japan]
SHIGA Strength&Weld Research Institute [Japan]
Hiroshi YAJIMA [Japan]
Yajima Material Integrity Laboratory [Japan]

Keywords: low transformation temperature welding material, boxing fillet welded joint, elongated bead, elongated bead length, fatigue strength improvement, weld metal fracture toughness, high strength ship hull steel plate

JOURNAL FREE ACCESS

2020 Volume 58 Issue 1 Pages 22-38

DOI https://doi.org/10.11181/hpi.58.22

Details

Abstract

In our previous study, it was shown that the fatigue life of the boxing fillet welded joint was enhanced by about 10 times by applying the elongated bead welding with 40 mm bead length to the welded joint by using low transformation temperature (L. T. T. ) welding material.
In this study, to investigate practical use of the elongated bead welding with L. T. T. welding material, the followings were discussed, (1) The estimation of the residual stress distribution of boxing fillet welded joint to which the elongated bead welding with L. T. T. welding material was applied, (2) The work load and time of elongated bead welding on site welding, (3) The fatigue life enhancing effect of two elongated bead welding joints using different L. T. T. welding materials, L. T. T. 10Cr-10Ni filler metal (LTT1) and L. T. T. 6. 5Mn filler metal (LTT2) , (4) The fatigue life enhancing effect by using LTT2 with and without elongated bead applied to repair welding of boxing fillet welded joint with fatigue crack, (5) The fracture toughness of weld metal with LTT1 welding material, and so on.

Corresponding author

Register with J-STAGE for free!