Transactions of the Japan Welding Society最新文献_第6页

Investigations on Usability of Undermatched Joint in a Superconducting Coil Case for Fusion Reactor 核聚变反应堆超导线圈箱欠匹配接头可用性研究

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.575

Toshimi Matsurnoto, M. Tsukamoto, F. Suzuki, Y. Wadayama, H. Satoh

{"title":"Investigations on Usability of Undermatched Joint in a Superconducting Coil Case for Fusion Reactor","authors":"Toshimi Matsurnoto, M. Tsukamoto, F. Suzuki, Y. Wadayama, H. Satoh","doi":"10.2207/QJJWS.9.575","DOIUrl":"https://doi.org/10.2207/QJJWS.9.575","url":null,"abstract":"In a Power Fusion Reactor, a huge megnetic field is necessary for plasma confinement. This field also interacts with the high current to produce large forces tending to deform the superconducting cables ; this electro-magnetic force demands very high values of the cryogenic yield strength and fracture toughness in the supporting structural materials. It is said to be difficult to develop welds satisfing the same criteria as for the structural material. It is useful to investigate the usability of welded joint with a lower yield strength than the base metal, but associated with a higher fracture toughness.From this viewpoint, the influence of the undermatched joint on the deformation and the stressstrain property of the coil case was investigated by using a finite element method. It is concluded that (1) there is only a slight difference in the overall deformation of the coil case whether the undermatched joint is included in the calculation or not, (2) the maximum strain and the muximum plastic strain at the undermatched welds can be controlled to be less than those in the base metal with a judicious choice of weld location and yield strength level of welds.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134508382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Influence of Residual Stress on Fatigue Strength of Non-load-carrying Fillet Weld Joints 残余应力对非承载角焊接头疲劳强度的影响

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.36

K. Matsuoka, I. Takahashi, T. Yoshii, E. Fujii

{"title":"Influence of Residual Stress on Fatigue Strength of Non-load-carrying Fillet Weld Joints","authors":"K. Matsuoka, I. Takahashi, T. Yoshii, E. Fujii","doi":"10.2207/QJJWS.9.36","DOIUrl":"https://doi.org/10.2207/QJJWS.9.36","url":null,"abstract":"In this paper, the influence of plate thickness on the fatigue strength of non-load-carrying fillet weld joints is examined both experimentally and analytically, from the view point of weld residual stresses.In order to control the longitudinal residual stresses (in the direction of the weld line), rib-cruciform joint specimens with various plate width were prepared. On the one hand, specimens of which heat input for each pass was varied were also prepared to control the transverse residual stresses (in the perpendicular direction to the weld line). Using these specimens, both residual stress measurement and fatigue tests were carried out.It was found that the plate width of specimen had great effects on the longitudinal residual stresses and little effect on the transverse residual stresses respectively. And it was also found that the transverse residual stresses increased as the heat input decreased.As far as the heat input was constant, the plate width had no effect on the fatigue strength. On the other hand, the heat input significantly influenced the fatigue strength of joints with a same thickness of main plate. That was, the fatigue strength in the case of high heat input was much higher than in the case of low heat input.From above results, it is concluded that the fatigue strength of non-load-carrying fillet weld joints depends on the transverse residual stresses and that the tensile residual stresses increase as the plate thickness increases and/or the heat input decreases, causing the reduction of the fatigue strength.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132083501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Analysis of residual stresses in evaporated and plating films 蒸发膜和电镀膜残余应力分析

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.7.543

Y. Suita, M. Toyoda, T. Hirano, Kazumasa Kusanagi, S. Nakamura, Yoshihiro Yamamoto, H. Mitani

引用次数: 2

The Effects of .DELTA.-Ferrite Morphology on Low Temperature Fracture Toughness of Austenitic Stainless Steel Weld Metal. delta的效果。-铁素体形貌对奥氏体不锈钢焊缝金属低温断裂韧性的影响。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.525

O. Kamiya, K. Kumagai, Y. Kikuchi

引用次数: 4

Friction Welding of Oxygen Free Copper to Pure Aluminum 无氧铜与纯铝的摩擦焊接

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.467

M. Aritoshi, K. Okita, T. Enjo, K. Ikeuchi, F. Matsuda

{"title":"Friction Welding of Oxygen Free Copper to Pure Aluminum","authors":"M. Aritoshi, K. Okita, T. Enjo, K. Ikeuchi, F. Matsuda","doi":"10.2207/qjjws.9.467","DOIUrl":"https://doi.org/10.2207/qjjws.9.467","url":null,"abstract":"The microstructure and bond strength of the friction-welded joint of Al (commercially pure aluminum) to OFC (oxygen free copper) have been investigated in order to understand the formation of intermetallic compounds and its effects on the mechanical properties of the joint. A mixing layer of Al and Cu which showed a fine stratified microstructure was formed in Al adjacent to the weld interface by mechanical picking-up of Cu into Al. In the mixing layer, intermetallic compounds CuAl2, CuAl and Cu9Al4 were detected by X-ray diffraction analyses and TEM. As forge pressure P2 was increased, the width of the mixing layer was decreased and the stratified microstructure became considerably isolated flaky one. The tensile strength of the joint was increased as P2 was increased, and at P2 above 120 MPa the joints were fractured in the heat affected zone of Al. On the other hand, the joints welded at P2 below 80 MPa were fractured mainly in the mixing layer. EDX analyses of the area around cracks suggested that the crack on the tensile test initiated at CuAl in the mixing layer, since the composition around the initiation site of the crack corresponded approximately to that of CuAl. From these results, it can be concluded that the intermetallic compounds, especially CuAl have harmful effects on the mechanical properties of the joint. The increase in the joint strength with rise in P2 can be explained as a consequence of the decrease in the thickness of the mixing layer which includes a number of fine intermetallic compound layers. The formation of mixing layer having the fine stratified microstructure is probably due to the mechanical mixing in the solid state, since the average temperature of frictionn interface estimated from the thermoelectric power between Cu and Al was below the lowest eutectic temperature of the Cu-Al system.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134486209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Inference of mechanical properties in heat treated steel from ultrasonic attenuation and velocity measurements. 从超声衰减和速度测量推断热处理钢的机械性能。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.5.550

I. Oda

{"title":"Inference of mechanical properties in heat treated steel from ultrasonic attenuation and velocity measurements.","authors":"I. Oda","doi":"10.2207/QJJWS.5.550","DOIUrl":"https://doi.org/10.2207/QJJWS.5.550","url":null,"abstract":"Round bar tension test, Charpy V impact test and static 3-point bending test as well as ultrasonic attenuation and wave velocity measurements are made by using carbon steel heat treated with various conditions. Those tests are carried out for the purpose of establishing the nondestructive methods for material property characterization. Correlations between results of material tests and ultrasonic attenuation or wave velocity are examined.Relationships between yield strength, ultimate strength or elongation percentage and attenuation coefficient are represented by smooth curves. Yield strength as well as ultimate strength decreases and elongation percentage increases with increasing attenuation coefficient. Relationship between Charpy V notch impact energy absorption in the upper shelf region and wave velocity is represented approximately by a straight line. Upper shelf energy absorption increases with increasing velocity. Relationship between critical COD and attenuation coefficient is represented roughly by a straight line. Critical COD increases with increasing attenuation coefficient. Using the results above mentioned, mechanical properties such as strength, elongation and fracture toughness can be estimated nondestructively from ultrasonic attenuation or wave velocity.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123673685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The nitrogen absorption of arc-melted iron and stainless steel. 弧焊铁和不锈钢的氮吸收。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.5.497

T. Kuwana, H. Kokawa

引用次数: 6

Application of Laser Beam Welding to Thin Steel Sheet 激光焊接在薄钢板上的应用

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.3.26

I. Masumoto, T. Shinoda, Hiroyuki Ishiyama

引用次数: 3

Metallic Joining Technique of Insulated Copper Coil. 绝缘铜线圈的金属连接技术。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.223

T. Haramaki, M. Nakamura, Takao Funarnoto, T. Shida

引用次数: 1

Estimation of the Cooling Time t8/5 and Thermal Factor of Weldments with Local Preheating. 局部预热焊件冷却时间t8/5及热系数的估算。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.436

T. Terasaki, K. Ishimoto

引用次数: 1