... tests were performed to optimize welded structures of tube and tubesheet. The results show that fractures of welded TA2 tube and tubesheet samples occur at weld zone of TA2 steel tube for the pull-out tests and low cycle fatigue tests. The extension-tubesheet welded joints have the maximum pull-out...

...) that indicates the reliability of the estimated result has not been shown, although a least squares method is used to smoothen the measured data. Welded joints in nuclear reactors have complex shapes, and the welding residual stresses have complex three-dimensional distributions. In this study, an inherent...

...Masaaki Tabuchi; Yukio Takahashi Creep strength of welded joint for high Cr ferritic heat resisting steels decreases due to Type-IV failure in heat-affected zone (HAZ) during long-term use at high temperatures. In order to review the allowable creep strength of these steels, creep rupture data...

...Masahito Mochizuki; Masao Toyoda A welded joint generally has heterogeneity of strength, material, and fracture toughness. It is important to understand the characteristics of the strength and fracture of welded joints while considering the heterogeneous effect. In particular, the material behavior...

...Masahito Mochizuki; Gyu-Baek An; Masao Toyoda The characteristics of dynamic strength and fracture in structural steels and their welded joints particularly for pipelines should be evaluated based on the effects of the strain rate and service temperature. The temperature, however, rises so rapidly...

...Masaaki Tabuchi; Hiromichi Hongo; Yongkui Li; Takashi Watanabe; Yukio Takahashi The creep strength of welded joints in high Cr steels decreases due to the formation of Type IV creep damage in heat-affected zones (HAZs) during long-term use at high temperatures. This paper aims to elucidate...

...Akihiko Ohta; Naoyuki Suzuki; Yoshio Maeda Fatigue crack propagation properties of welded joints were investigated on steel plate for boilers and other pressure vessels. The fatigue crack propagation properties at 300°C became similar to those at room temperature when the thermal stress could...