A5043389902- Welding Techniques and Residual Stresses
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Non-Destructive Testing Techniques
- High Entropy Alloys Studies
- Advanced Surface Polishing Techniques
- Advanced machining processes and optimization
- Engineering and Environmental Studies
- Manufacturing Process and Optimization
- Advanced Machining and Optimization Techniques
- Fluid Dynamics and Turbulent Flows
- Advanced Sensor Technologies Research
- Metallurgy and Material Science
- Laser and Thermal Forming Techniques
- Electromagnetic Launch and Propulsion Technology
- Meteorological Phenomena and Simulations
- Advanced Measurement and Metrology Techniques
- Mechanical stress and fatigue analysis
- Material Properties and Applications
- Copper Interconnects and Reliability
- Network Security and Intrusion Detection
- Semiconductor materials and interfaces
- Soft Robotics and Applications
- Supramolecular Chemistry and Complexes
- Metallurgy and Cultural Artifacts
Fukuda Denshi (Japan)
2017-2025
Osaka University
2018-2023
NOK Corporation (Japan)
2002
NSK (United States)
1990-1995
Kiryu University
1994
Gunma University
1994
In this research, the microstructure and tensile properties of Cu–2–7 mass% Al alloys in α single-phase region on phase diagram fabricated by laser powder bed fusion (PBF-LB) process casting were systematically examined, their formation mechanism strengthening investigated. As a result, micro-fine cellular structures formed segregation due to constitutional supercooling rapid solidification phenomenon PBF-LB leaded high strength 0.2% proof stress, which much higher than those castings. It...
Pure copper is utilized as a material for products with complicated shape and high thermal conductivity such heat exchangers. However, it difficult to fabricate pure parts density by the selective laser melting (SLM) process. One of reasons considered be its which in melt pool rapidly diffuses away. Additionally, lower rate energy absorption fiber power makes size smaller. In this research, optimum fabrication condition high-purity 99.9% fabricated SLM process was investigated evaluating...
Through laboratory experiments of oil-in-water emulsification, we show that can construct a high-shear-rate mixer (precession mixer) by using the precession cylindrical container without any mixing blades. For mixing, with larger diameter and its faster spin are preferable so wall velocity becomes large enough. Then, emulsification is most efficient when set Poincaré number Po=Ωp/Ωs, which ratio rotation speeds, about 0.2–0.3. When Po smaller than these values, shear rates in get much lower,...
One of the important subject in study automatic arc welding is to establish control system parameters for controlling bead shape, namely penetration depth, width and height, by detecting or predicting behavior molten pool owing change groove shape.This report describes simultaneous depth height despite variation root gap gas metal with X-groove. In this system, detected image processing CCD (charge coupled device) camera, current speed are controlled order keep constant height. Furthermore...
Summary This paper describes an automatic welding system that can simultaneously control the bead height and back shape during one‐sided MAG with a backing plate. The uses high‐speed rotating arc process together sensing technique for seam tracking torch control. is also used to detect variations in groove shape. detection mechanism described detail this paper. further newly developed parameter method which only wire feedrate voltage are adaptively controlled, other conditions being kept...
Additive manufacturing (AM) is a prominent technology in the industrial fields such as aerospace, medical, automotive and so on. Especially, selective laser melting (SLM) process available to create three-dimensional complicated structures of various alloys stainless steel, titanium alloy, aluminium nickel-based superalloy And also, copper are used material for products with shape, electrical components, heat exchanger because having high conductivity thermal conductivity. It known that show...
Abstract Calix[4]arene analog (2) having 2-[2-(2-methoxyethoxy)ethoxy]ethyl groups was prepared in 92% yield. Compound 2 showed the extraction of alkali metal ions as an ionophore and catalytic activity for some SN2 reactions.
An automatic welding system that can simultaneously control the bead height and back shape in one side MAG process with backing plate has been introduced this paper. In system, a high speed rotating arc method is used seam tracking torch are realized by utilizing sensing technique.On other hand, variations of groove also detected technique. The detecting mechanism detail discussed paper.Moreover, uses new parameters developed authors which only wire feeding rate voltage adaptively regulated...
The high speed rotating arc process originally developed for NGW-MAG welding has significant features bead formation, such as decentralization of penetration and formation concave profile. examination carried out horizontal fillet by this proved that the is also suitable welding. Foremost, action prevents hanging weld forms flat surface under condition. Another advantage function automatic seam tracking sensor control. Real time precision guidance can be achieved detecting voltage waveform...
The digging action of arcs and behavior molten pool during submerged arc welding have been analized by X-ray fluoroscopic observation.Under the condition normal bead, is stable some layer metal formed beneath electrode. On other hand, under undercut or humping exposed solid surface observed electrode.In two electrode tandem with respect to high speed welding, there a optimum ratio trailing current (IT) leading (IL). This owed that effective arcpressure IL acting gravity head decreased...
Recently, the serious problems facing heavy industries such as increase in average age of employees, shortage skilled workers and environmental workplace are being addressed. The bridge panel fabrication system we have developed is an approach to solve these problems. It consists two parallel box girder sub-assembly lines, one exclusively for web panels other flange. Each line made up stages fitting, welding, re-forming, drilling finishing. All equipment controlled by computer central...
Innovations for the sub-assembly process have been implemented with CAD/CAM multirobot welding system. There are 26 sets of arc robot under operation steel bridge panel fabrication in NKK's Tsu Works. The first step was taken 1992. box girder lines 14 robots were developed. second step, plate line 10 developed 1994. During same period, T-shaped transverse rib 2 key technologies systemization classified into 4 groups, such as process, sensor, and computer Doubled efficiency has attained...
One of the important subject in study automatic arc welding is to establish control system parameters for controlling bead shape, namely penetration depth, width and height, by detecting or predicting behavior molten pool owing change groove shape.This report describes effect on shape simultaneous depth height variation root gap gas metal welding. From fundamental investigation optimum method, following results were obtained.1) By method additional filler wire feeding rate order maintain...
The automatic seam tracking system by arc sensor method developed NKK has an original feature, that a weaving in groove performs surface under constant length control (AVC or ACC) and the turning point of is controlled condition when torch height reaches to preset level. In this system, width well corresponds independently variation deposited amount metal. Namely, value same as width. Based on relationship, welding speed been developed. Where, only used detected parameter, optimum keep bead...
One of the important subject in study automatic arc welding is to establish control system parameters for controlling bead shape, namely penetration depth, width and height, by detecting or predicting behavior molten pool owing change groove shape.This report describes simultaneous depth height despite variation root gap gas metal with X-groove. In this system, detected image processing CCD (charge coupled device) camera, current speed are controlled order keep constant height. Furthermore...
Arc sensor, which utilizes the welding arc as a gives important groove information during welding. Automatic seam tracking control system with sensor developed by NKK has fesature, that turning point of transverse weaving constant length (AVC) is decided condition, when torch height reaches to set level.Under applying above system, variation and deposition area can be detected from trace weaving. The automatic real-time bead been utilizing information. width close corelation deposition....
In the field of electronics, silver is widely used as a conductive material. order to improve electrical conductivity silver-containing material, it essential form network in it, which requires not only controlling size and number particles but also flake shape.
In this research, the microstructure and tensile properties of Cu-7 mass%Al alloy in α single-phase region Cu-10 (α + γ2) two-phase on phase diagram fabricated by laser powder bed fusion (PBF-LB) process casting were systematically examined, investigated their formation mechanism strengthening mechanism. As a result, case alloy, micro-fine cellular structures formed segregation Al due to constitutional supercooling rapid solidification phenomenon PBF-LB leaded high strength 0.2% proof...