The Experts below are selected from a list of 4515 Experts worldwide ranked by ideXlab platform

Halina Pasek-siurek - One of the best experts on this subject based on the ideXlab platform.

Hikaru Yamamoto - One of the best experts on this subject based on the ideXlab platform.

  • Tracking using pattern matching of keyhole in visual robotic Plasma Welding
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Weixi Wang, Satoshi Yamane, Kazumichi Hosoya, Toru Nakajima, Qi Wang, Takaaki Hirano, Hikaru Yamamoto
    Abstract:

    Compared to conventional Welding technique, Plasma arc Welding (PAW) is known without spatter and fume. Owing to the characteristic of high Welding quality, PAW becomes more and more attractive in Welding industry. In order to achieve stable Welding for a long time, it is essential to employ an automatic control during Welding process. Welding quality in PAW is considered depending on the performance of tracking results and maintenance of keyhole that an image processing method for automatic tracking of weld line has been developed under monitoring of keyhole. This method can help Welding engineers to make a visible automatic control instead of human sight to teach Plasma torch on condition that Plasma electrode hides in the torch. As a consequence, successful tracking has been achieved in Welding results that has well improved the efficiency of Welding work and effectively ensure the Welding quality.

  • Observation of keyhole in visual Plasma Welding robot
    Quarterly Journal of The Japan Welding Society, 2015
    Co-Authors: Satoshi Yamane, Weixi Wang, Tomoyuki Koike, Jiro Touma, Kazumichi Hosoya, Toru Nakajima, Hikaru Yamamoto
    Abstract:

    Stable formation of the back bead in joining of thick material is important so as to achieve high quality of welded joint. Since Plasma Welding employs high current density, it is suitable in the joining of thick material. The quality of Plasma Welding depends on keyhole which is generated from pilot gas and Welding current. As a result, the relationship between Welding voltage and keyhole is unclear. It is very difficult to estimate the keyhole by Welding voltage and current. Authors have tried to observe the keyhole and weld pool from the top side of base metal directly. For this purpose, a CCD camera is applied with an external trigger. Moreover, the situation of keyhole is taken by high speed camera in order to determine the peak current and base current. Timing of the shutter in CCD camera is set up to take clear images of the weld pool. The formation of keyhole is investigated under two kinds of pilot gas. One is a mixture of Ar 93% and H2 7% and the other is Ar 100%. The Welding condition and groove shape are found to observe the keyhole from the top side of base metal.

  • Detecting and tracking of Welding line in visual Plasma robotic Welding
    Welding International, 2014
    Co-Authors: Satoshi Yamane, Kazumichi Hosoya, Toru Nakajima, Takahiro Godo, Hikaru Yamamoto
    Abstract:

    The formation of stable back beads in joining of the thick materials is important in order to achieve high-quality welded metal joints. Plasma Welding uses the high Welding current density, which is suitable for thick materials. The keyhole in the Plasma Welding depends on the pilot gas and the Welding current. The voltage behaviour depends on the keyhole situation. If the torch is moved away from the Welding line in conventional GMA Welding, the Welding voltage and the Welding current are changed due to variations of the arc length. But the Welding voltage does not change with the arc length in Plasma Welding, because the Welding voltage depends on the situation of the keyhole. The authors tried to observe the weld pool on the top side by using a CCD camera. The timing of the shutter in the CCD camera is investigated to take clear images of the weld pool. As a result, the clear images of the weld pool were taken when the Welding current was reduced to 30 A and an interference filter of 950 nm was attache...

Sruthi Radhakrishnan - One of the best experts on this subject based on the ideXlab platform.

  • 3D Porous Graphene by Low‐Temperature Plasma Welding for Bone Implants
    Advanced Materials, 2016
    Co-Authors: Dibyendu Chakravarty, Chandra Sekhar Tiwary, Cristano F. Woellner, Sruthi Radhakrishnan, Soumya Vinod, Sehmus Ozden, Pedro Alves Da Silva Autreto, Sanjit Bhowmick, S. A. Syed Asif, Sendurai A. Mani
    Abstract:

    3D scaffolds of graphene, possessing ultra-low density, macroporous microstructure, and high yield strength and stiffness can be developed by a novel Plasma Welding process. The bonding between adjacent graphene sheets is investigated by molecular dynamics simulations. The high degree of biocompatibility along with high porosity and good mechanical properties makes graphene an ideal material for use as body implants.

  • 3d porous graphene by low temperature Plasma Welding for bone implants
    Advanced Materials, 2016
    Co-Authors: Dibyendu Chakravarty, Chandra Sekhar Tiwary, Cristano F. Woellner, Sruthi Radhakrishnan, Soumya Vinod, Sehmus Ozden, Pedro Alves Da Silva Autreto, Sanjit Bhowmick, S Syed A Asif
    Abstract:

    3D scaffolds of graphene, possessing ultra-low density, macroporous microstructure, and high yield strength and stiffness can be developed by a novel Plasma Welding process. The bonding between adjacent graphene sheets is investigated by molecular dynamics simulations. The high degree of biocompatibility along with high porosity and good mechanical properties makes graphene an ideal material for use as body implants.

S Syed A Asif - One of the best experts on this subject based on the ideXlab platform.

  • 3d porous graphene by low temperature Plasma Welding for bone implants
    Advanced Materials, 2016
    Co-Authors: Dibyendu Chakravarty, Chandra Sekhar Tiwary, Cristano F. Woellner, Sruthi Radhakrishnan, Soumya Vinod, Sehmus Ozden, Pedro Alves Da Silva Autreto, Sanjit Bhowmick, S Syed A Asif
    Abstract:

    3D scaffolds of graphene, possessing ultra-low density, macroporous microstructure, and high yield strength and stiffness can be developed by a novel Plasma Welding process. The bonding between adjacent graphene sheets is investigated by molecular dynamics simulations. The high degree of biocompatibility along with high porosity and good mechanical properties makes graphene an ideal material for use as body implants.

Wang Xijin - One of the best experts on this subject based on the ideXlab platform.

  • Plasma Welding Process of Nickel Alloy N6 with Filler Wire
    Hot Working Technology, 2013
    Co-Authors: Wang Xijin
    Abstract:

    The 6 mm pure Nickel N6 plates was welded with filler wire using automatic Plasma Welding.Compared with welded joint without filler wire,the optimal process parameters of Plasma Welding with filler wire were determined.The results are as follows:well-formed welded joint can be obtained by determining proper Plasma Welding with filler wire process parameters.The optimized Welding parameters:Welding current is 200-210 A,Plasma gas flow is 3 L/min,Welding speed is180 mm/min,wire feed speed is 900-1200 mm/min,the back of the argon flow is 15 L/min.The tensile strength of the welded joint is significantly improved.The tensile strength of the welded joint reach 333 MPa and it is 97.6% of that of the base metal.By the microstructure observation,it found that the microstructure of the weld is compact,and the grain is fine.Plasma Welding with filler wire can provide an efficient method for realizing the Welding of N6 nickel alloy plate.