Transactions of the Japan Welding Society最新文献_第9页

Ductility Loss due to Dynamic Strain Aging in Heat-Affected Zone of High Strength Low Alloy Steel 高强度低合金钢热影响区动态应变时效引起的延性损失

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.50.465

Y. Kikuta, T. Araki, M. Yoneda, K. Yasuda, K. Matsueda

{"title":"Ductility Loss due to Dynamic Strain Aging in Heat-Affected Zone of High Strength Low Alloy Steel","authors":"Y. Kikuta, T. Araki, M. Yoneda, K. Yasuda, K. Matsueda","doi":"10.2207/QJJWS1943.50.465","DOIUrl":"https://doi.org/10.2207/QJJWS1943.50.465","url":null,"abstract":"When tensile tests on mild steel are carried out at various temperatures, the serrated yielding and flow are observed at a certain testing temperature range, specially 100-300°C, and the consequent em-brittlement occurs. This phenomenon is generally known as a blue brittleness or a dynamic strain aging and is related to testing temperature, solute atom contents (carbon and/or nitrogen contents), strain rate and so forth.On the other hand, for base metal of QT-type high strength low alloy steels in which solute atoms such as carbon and nitrogen are fixed as carbide, nitride or carbo-nitride by heat treatment, such embrit-tlement seems to be not apt to occur comparatively. But, even if QT-type steels, there is a possibility of dynamic strain aging in heat-affected zone (HAZ) because of the above carbide, nitride or carbo-nitride dissolving by welding heats, and the consequent embrittlernent.This study was investigated about the ductility loss due to dynamic strain aging in HAZ of a 80 kg/mm2 class high strength low alloy steel.It is found by this study that dynamic strain aging and, thus, the ductility loss can occur in HAZ even if QT-type steels. The degree of ductility loss is increased in the order of upper bainite, lower bainite and martensite structure.These results can be qualitatively interpreted by considering as interaction between dislocations and solute atoms, specifically nitrogen atoms rather than carbon atoms.Transformed HAZ, which is heated above 1200°C and has martensite structure and, thus, a high content of free nitrogen atoms, is sensitive to ductility loss due to dynamic strain aging as well as the deterioration of grain coarsened HAZ toughness.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"30 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":"133611840","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

Effect of Continuous Postheating Time on Reduction of Preheating Temperature. 连续预热时间对降低预热温度的影响。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.442

Y. Nishio, Kozo Kito, S. Kanemitsu

引用次数: 1

Automatic real-time bead height control with arc sensor in TIG welding. TIG焊中电弧传感器自动实时控制焊头高度。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.4.20

H. Nomura, Y. Sugitani, Yasuo Suzuki

引用次数: 3

Effect of Plastic Deformation on Fatigue Crack Closure Behavior in Low Yield Strength Material and Its Welded Joint 塑性变形对低屈服强度材料及其焊接接头疲劳裂纹闭合行为的影响

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.423

Y. Mukai, M. Murata

引用次数: 0

Mechanical properties of weld metals subjected to thermal prestraining cycles and its application to deformation analysis of weld joint. 热预紧循环作用下焊缝金属的力学性能及其在焊缝变形分析中的应用。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.3.862

Y. Itoh, K. Nagata, Tetsu Yanuki, Tadao Mori

{"title":"Mechanical properties of weld metals subjected to thermal prestraining cycles and its application to deformation analysis of weld joint.","authors":"Y. Itoh, K. Nagata, Tetsu Yanuki, Tadao Mori","doi":"10.2207/QJJWS.3.862","DOIUrl":"https://doi.org/10.2207/QJJWS.3.862","url":null,"abstract":"Mechanical and metallurgical heterogeneity in wled joints, which is caused by thermal prestraining cycles, have an important effect upon their deformation and strength behaviors. If the mechanical properties of steels and weld metals subjected to thermal prestraining cycles can be estimated conveniently, it is easy to analyze the deformation behaviors of weld joints by use of numerical computation procedures.In this study three kinds of weld metals, which are formed at weld joints of a carbon steel (SM41B), an austenitic stainless steel (SUS304) and a martensitic cast steel (SCS5), were used for experiments. Their mechanical properties depended upon the thermal prestraining conditions, for example, peak temperature, retention time at constant temperature, multi-thermal prestraining cycles. The experimental results indicated that elastic limit, yield stress, strength coefficient and strain hardening exponent of materials sub-jected to thermal prestraining cycles could be expressed as a function of Vickers hardness.As an application, the material constants for elastic-plastic FEM analysis were determined from the Vickers hardness distribution of weld and butt weld joint were analyzed in terms of plastic zone extension from the view of mechanical heterogeneity.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"41 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":"128147059","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: 6

Carbide Precipitation and Corrosion Resistance in HAZ of 15Cr-75Ni Alloy 15Cr-75Ni合金热影响区碳化物析出及耐蚀性

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.6.530

K. Ogawa, M. Miura, T. Minami

引用次数: 1

Influence of the Cross-sectional Area of Consumable Nozzle on Welding Phenomena in Electrosalg Welding 电液焊中焊嘴截面积对焊接现象的影响

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws1943.50.373

S. Nakata, Nobuharu Sakabata, Minoru Mouko

{"title":"Influence of the Cross-sectional Area of Consumable Nozzle on Welding Phenomena in Electrosalg Welding","authors":"S. Nakata, Nobuharu Sakabata, Minoru Mouko","doi":"10.2207/qjjws1943.50.373","DOIUrl":"https://doi.org/10.2207/qjjws1943.50.373","url":null,"abstract":"Influence of the cross-sectional area of consumable nozzle on the penetration in base plate and its stability and the possibility on the control of welding phenomena by changing the nozzle current is investigated using the mild steel plate with the thickness of 30 mm to develop narrow gap electroslag welding process with high efficiency and low heat input.It is experimentaly shown that the nozzle with large crosssectional area is useful in stable and high current welding process because of dispersing the welding current in slag pool by increasing the nozzle current. So, the method for estimating the nozzle current during welding is designed and, by this method, the nozzle current is estimated under various conditions in connection with the cross-sectional area of the nozzle.Adopting above results to high current narrow gap welding process, it is clarified that more stable and uniform penetration can be obtained by using the nozzle with large cross-sectional area. This result is due to the preheating effect at root faces of base plate in slag pool and dispersing the heat source in slag pool by increase of nozzle current.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"1242 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":"114694094","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

Predicting Heating and Cooling Times due to Local Preheating 预测加热和冷却时间由于局部预热

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.446

T. Terasaki, K. Ishimoto

引用次数: 3

Automatic Real-Time Bead Height Control with Arc Sensor (Report 2) : Development of Multi-Pass MAG Arc Welding System 基于电弧传感器的自动实时焊头高度控制(报告二):多道MAG弧焊系统的开发

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.4.508

H. Nomura, Y. Sugitani, N. Tamaoki

{"title":"Automatic Real-Time Bead Height Control with Arc Sensor (Report 2) : Development of Multi-Pass MAG Arc Welding System","authors":"H. Nomura, Y. Sugitani, N. Tamaoki","doi":"10.2207/QJJWS.4.508","DOIUrl":"https://doi.org/10.2207/QJJWS.4.508","url":null,"abstract":"The automatic seam tracking system by arc sensor method developed by NKK has an original feature, that a weaving arc in a groove performs groove surface tracking under constant arc length control (AVC or ACC) and the turning point of weaving is controlled by the condition when torch height reaches to constant preset level. In this system, weaving width well corresponds to groove width independently to variation of deposited amount of metal. Namely, variation value of weaving width is same as that of groove width. Based on this relationship, welding speed control system has been developed. Where, only the variation value of weaving width is used as detected parameter, and optimum value of welding speed to keep bead height constant is calculated and output at every cycle of weaving. The pulsed MAG arc welding system for multi-pass welding of V shaped butt joint has been developed. Main function of this system is adaptive microcomputer control with above mentioned arc sensor method, such as seam tracking, weaving width control and bead height control for every pass of welding.In addition, following functions are also composed: built-up sequence control where number of passes is automatically decided from weaving width, simplified operating system by man-machine dialogic style with liquid crystal display and a key board, and use of a couple of optical fiber cable for transmission of multiple control signals. This system has been already applied to the fabrication of steel box columns.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"36 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":"130766146","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: 5