Transactions of the Japan Welding Society最新文献_第4页

Plasma Spraying of Metal-Ceramic Composite Powders Produced by MA Method 等离子喷涂法制备金属陶瓷复合粉末的研究

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.489

M. Fukumoto, Noriaki Yaegashi, Makoto Shimanuki, M. Umemoto, I. Okane

{"title":"Plasma Spraying of Metal-Ceramic Composite Powders Produced by MA Method","authors":"M. Fukumoto, Noriaki Yaegashi, Makoto Shimanuki, M. Umemoto, I. Okane","doi":"10.2207/qjjws.9.489","DOIUrl":"https://doi.org/10.2207/qjjws.9.489","url":null,"abstract":"High performance metal matrix composite coatings could be fabricated by using the highly mixed metal-ceramic composite powders. In this study, composite powders both of Cu-Al2O3 system and of Cu-AlN system were produced by mechanical alloying (MA) method. The composite coating were made by plasma spraying of these pre-composite powders. To compare with these composite coatings, conventional coatings were made by using the conventional Cu and Al2O3 powder. The quality of the coatings obtained were evaluated by abrasion were test and the electric properties were also investigated.The main results of this study are summarized as follows, (1) In the case of spraying of MA powders, the separation of the ceramics from the metal occured due to the relative difference of specific gravity between them. Nonetheless, the sprayed coating made with MA pre-composite powders had finer microstructure and higher were resistance than made with conventional powders.(2) The electric resistivity values of the coatings made with MA powders did not scatter largely compared with those of the conventional coatings because of the homogeneous structures. Therefore, it was found that highquality composite coatings with fine and homogeneous structure can be obtained using MA powders.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"7 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":"131599483","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: 0

Correlation between Arc Phenomena and Welding Parameters in Submerged-Arc Welding 埋弧焊中电弧现象与焊接参数的关系

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.50.520

K. Akahide, Teruo Uke Ukibe, J. Tsuboi

引用次数: 5

Implementation in Hardware and Its Evaluation of Dual Lines Scanning Method : Perimeter Measurement by Dual Lines Scanning Method (Second Report) 双线扫描法的硬件实现及其评价——用双线扫描法测量周长(第二报告)

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.228

K. Nakashima, Yutaka Obuchi, Katsunori Inoue

{"title":"Implementation in Hardware and Its Evaluation of Dual Lines Scanning Method : Perimeter Measurement by Dual Lines Scanning Method (Second Report)","authors":"K. Nakashima, Yutaka Obuchi, Katsunori Inoue","doi":"10.2207/QJJWS.9.228","DOIUrl":"https://doi.org/10.2207/QJJWS.9.228","url":null,"abstract":"The development of the high-speed algorithm, using dual lines scanning, called DLS, of perimeter measurement for the figures of binary image was described in the previous report. And also it was proved theoretically that the accuracy of the measurement with that algorithm increases by employing rectangular pixel of large vertical-horizontal ratio in the same report.At this time, the algorithm is implemented in the simple hardware and the measuring characteristics is evaluated for various shape of figures. The experimental results closely agree with the estimation by the computer simulation made beforehand.There are two ways for realizing rectangular pixel with large vertical-horizontal ratio in the present raster scanning video system, they are to increase the horizontal or to decrease the vertical resolution respectively. It is confirmed experimentally that the accuracy of measurement is improved even in latter case, in which the total resolution is decreased.As the results of experimental investigation, it can be substantiated that the DLS algorithm is practically effective for the perimeter measurement of figures.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"12 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":"125206100","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: 0

Construction of 3-dimensional Image by Using A Characteristics of Secondary Electron Intensity with SEM and It's Application 利用扫描电镜二次电子强度特征构建三维图像及其应用

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.452

M. Murata, Y. Mukai, Y. Taguchi, M. Hotta

引用次数: 0

Brazing of Commercial Pure Titanium with Zr-based Filler Metal. 纯钛与锆基钎料的钎焊。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.372

Takehiko Watanabe, M. Hoshino

引用次数: 1

Initiation and Propagation Characteristics of Lamellar Tearing and Root Cracking in Corner Joint 角接头片层撕裂和根部开裂的萌生和扩展特性

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.49.621

Y. Ueda, Iwao Nishimura, Hideaki Iiyama, Naomichi Chiba

引用次数: 0

Tensile Deformation Analysis of Bead Weld Based on Simple Three Zone Model 基于简单三区模型的焊缝拉伸变形分析

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.50.354

Shigeo Matsushima, K. Nozawa, Kenzo Nakamura, T. Enjo

{"title":"Tensile Deformation Analysis of Bead Weld Based on Simple Three Zone Model","authors":"Shigeo Matsushima, K. Nozawa, Kenzo Nakamura, T. Enjo","doi":"10.2207/QJJWS1943.50.354","DOIUrl":"https://doi.org/10.2207/QJJWS1943.50.354","url":null,"abstract":"From a simple model of the bead weld constructed by three zones (base metal (BM) without heat affected zone, heat affected zone (HAZ) and weld metal (WM)), the approximate analysis for the tensile deformation of bead welds (mild steel (arc): three.zones, and copper (TIG and electron beam) and aluminum (TIG): two zones of BM and WM) have been carried out. And the confirmation for the propriety of this analysis is made by the tensile test of their bead welds.As the results, it is found that absolute values of both ratios (σ/σx) and (e/ex) are larger than 0.85 (σ and e: equivalent stress and strain, and σx and ex: normal stress and longitudinal strain), and that the tensile deformation of bead weld is approximately expressed by the tensile deformation of the heterogeneity distribution. Moreover, it is found that initial yield for mild steel, copper (TIG) and aluminum occurs in BM in the vicinity of WM, and yield for copper (electron beam) occurs near the ditch (made by the weld), and that the yielding progresses along the boundary of HAZ (for arc and TIG). Also, it is recognized that the inclination (not perpendicular in the tensile direction) of boundary of HAZ and the contignity between HAZ and WM are necessary for the occurrence of the initial yield and for the yield progress and that the variations of the stress and the strain near boundaries between their zones occurs remarkably.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"6 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":"116913572","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: 0

Thermal Stresses Developed In High-strength Steels Subjected To Thermal Cycles Simulating Weld Heat-affected Zone 高强度钢在模拟焊接热影响区的热循环下产生的热应力

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.35.9_780

K. Satoh, S. Matsui, T. Machida

{"title":"Thermal Stresses Developed In High-strength Steels Subjected To Thermal Cycles Simulating Weld Heat-affected Zone","authors":"K. Satoh, S. Matsui, T. Machida","doi":"10.2207/QJJWS1943.35.9_780","DOIUrl":"https://doi.org/10.2207/QJJWS1943.35.9_780","url":null,"abstract":"Residual stress less than tensile yield stress of the material is obtained for usual groove welds of high-strength steels (See Fig. 1). In the present research attention was focused on the difference in thermal stress cycle between mild steel and high-strength steel welds. Experiments were made in such manner that a round bar specimen (Fig. 3) set in a rigid frame (Fig.2) was subjected to a thermal cycle simulating weld heat-affected zone. The thermal cycle was given by high frequency induction heating and air-cooling or controled-cooling. Thermal stress developed in the specimen was measured by a load-cell (capacity 2 tons) connected to the specimen. A mild steel and HY-80 steel were used for the experiments (See Table 1.)Thermal cycles measured at several points on the specimen are shown in Figs. 4 and 5. Free expan-sions as shown in Figs. 6 and 7 were obtained between end chucks of the specimen during thermal cycles. Uniform temperature distribution along parallel part of the specimen was not expected because of high frequency induction heating. Peculiar shape of the free expansion curves is obtained as the result of nonuniform temperature distribution (See Fig. 8.).Figs. 9 thru 11 show thermal stress cycles plotted for surface temperature at the center of the specimen. It was found that factors by which residual stress is lowered are the decrease in Ar transformation temperature range over which yield stress of the material is rather small and the increase in expansion during the transformation. Therefore, rapid cooling from higher temperature than Ac1 point lowers residual stress level in high yield-strength steel welds (See Fig. 12).Degree of restraint for the rigid frame used was investigated by an analogical system shown in Fig. 13. The restraint was about one-third as large as a bar with uniform temperature fixed at the ends.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"1 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":"129703762","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: 31

Experimental Study on the Mechanical Behavior and the Tensile Strength of Partial Penetration Groove Welded Joint 部分熔透槽焊接接头力学性能及抗拉强度试验研究

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.42.302

K. Satoh, K. Seo, Genichi Higuchi, T. Yatagai

引用次数: 1

Effect of Grain Boundary Structure on Weld Decay of Austenitic Stainless Steel (Part 1) : Crain Boundary Structure and Intergranular Corrosion in a Type 304 Stainless Steel Weld Heat Affected Zone 晶界组织对奥氏体不锈钢焊缝腐蚀的影响(一):304型不锈钢焊缝热影响区的晶界组织与晶间腐蚀

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.258

H. Kokawa, T. Kuwana

{"title":"Effect of Grain Boundary Structure on Weld Decay of Austenitic Stainless Steel (Part 1) : Crain Boundary Structure and Intergranular Corrosion in a Type 304 Stainless Steel Weld Heat Affected Zone","authors":"H. Kokawa, T. Kuwana","doi":"10.2207/QJJWS.9.258","DOIUrl":"https://doi.org/10.2207/QJJWS.9.258","url":null,"abstract":"Grain boundary carbide precipitation and corrosion in weld heat affected zone of a type 304 austenitic stainless steel were investigated using optical and scanning electron microscopy to discuss effects of grain boundary structure on precipitation and corrosion from a crystallographic viewpoint. In the grain boundary precipitation region, the frequency of grain boundary carbide precipitation had a maximum near the coarse grained region and decreased gradually with the distance from there to the unaffected base metal region. The frequency increased with weld heat input. Strauss test of 304 steel HAZ showed that all the cracked grain boundaries after bend test had carbide precipitates and that the frequency of cracked boundary was roughly proportional to the frequency of grain boundary precipitation. Electron channel-ling pattern analyses in scanning electron microscopy showed that grain boundaries with ordered atomic structures were hardly etched after 10% oxalic acid etching test. These facts have suggested that grain boundary precipitation and corrosion in stainless steel weld heat affected zone depend sensitively on crystallographic character of grain boundary.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"51 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":"114119857","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: 4