The Experts below are selected from a list of 2004 Experts worldwide ranked by ideXlab platform

Jicai Feng - One of the best experts on this subject based on the ideXlab platform.

  • effect of metal transfer mode on spatter and arc stability in underwater Flux Cored Wire wet welding
    Journal of Manufacturing Processes, 2018
    Co-Authors: Yunlong Fu, Yongpeng Du, Hao Chen, Changsheng Xu, Jicai Feng
    Abstract:

    Abstract The effect of metal transfer mode on spatter and arc stability during underwater Flux-Cored Wire wet welding at different process parameters are investigated adopting the synchronous acquisition system of X-ray image and electric signal. Two spatter modes i.e. the local droplet repelled spatter and the droplet explosion spatter were observed for the first time. The generation of the local droplet repelled spatter is attributed to the excessive and unstable repulsive forces, while the droplet explosion spatter is caused by the unstable repulsive forces and gas dynamic force. Welding spatters and arc stability depend on the metal transfer mode. During wide-angle globular repelled transfer mode, the droplet repelled spatter mode is observed and the forming frequencies of the local droplet repelled spatter and droplet explosion spatter are higher than other transfer modes. The short-circuit explosions are observed in short-circuit explosive transfer mode, causing numerous short-circuit explosive spatters. With the increase of arc voltage, both the spatter loss coefficient and voltage variation coefficient decrease firstly to the minimum at the arc voltage of 32 V and then increases gradually, attributed to the type and proportion of metal transfer mode.

  • effects of welding velocity on metal transfer mode and weld morphology in underwater Flux Cored Wire welding
    Journal of Materials Processing Technology, 2017
    Co-Authors: Yunlong Fu, Yongpeng Du, Jicai Feng, Yongpeng Wang, Zongquan Deng
    Abstract:

    Abstract Metal transfer process in underwater Flux-Cored welding are investigated by X-ray transmission method for welding velocity from 0.5 mm/s to 9.5 mm/s. The metal transfer mode of underwater Flux-Cored Wire welding is the mixed transfer mode mainly composed of four fundamental transfer modes i.e. wide-angle globular repelled transfer mode, small-angle globular repelled transfer mode, surface tension transfer mode and short-circuit transfer mode. The category and proportion of fundamental modes constituting the mixed mode depend strongly on the welding velocity owing to the variation of force condition on droplet. With increasing welding velocity, the proportion of the wide-angle globular repelled transfer mode increases continually while that of the surface tension transfer mode and short-circuit transfer mode decreases, and the proportion of the small-angle globular repelled transfer increases firstly and then decreases gradually. The welding appearance and cross-sectional macrostructure of weld specimens at different welding velocities are also investigated. When the welding velocity increases from 0.5 mm/s to 3.5 mm/s, the weld width decreases from 20 mm to 12 mm and the weld penetration increases rapidly from 0.8 mm to 3.7 mm, completely different from in-air welding.

  • effect of boric acid on metal transfer mode of underwater Flux Cored Wire wet welding
    Journal of Materials Processing Technology, 2015
    Co-Authors: Yongpeng Du, Yunlong Fu, Jicai Feng
    Abstract:

    Abstract For obtaining high quality of underwater welding repairing for nuclear power equipments, the influence of boric acid on metal transfer process of underwater Flux-Cored Wire wet welding in boric acid solution is explored by an X-ray transmission system. The research results show that the mixed repelled globular transfer and solid short circuit transfer mode and the mixed repelled globular transfer and surface tension transfer mode are two kinds of main metal transfer modes during underwater welding in boric acid solution. The proportion of the mixed repelled globular transfer and surface tension transfer mode is increasing with the increasing of concentration of boric acid solution, which is caused by the difference of force condition of the droplet.

  • metal transfer in underwater Flux Cored Wire wet welding at shallow water depth
    Materials Letters, 2015
    Co-Authors: Meirong Wang, Yongpeng Du, Jicai Feng
    Abstract:

    Abstract The metal transfer process of underwater Flux-Cored Wire wet welding is successfully observed by an X-ray transmission method. The relatively large retention forces acting on the droplet induced by the electromagnetic force, vaporization force, surface tension resultant force and gas flow drag force make the transfer mode as a combination of globular repelled transfer mode and short circuit transfer mode with the average transfer frequency of 4.3 Hz with arc voltage of 24 V and welding current of 240 A.

Yongpeng Du - One of the best experts on this subject based on the ideXlab platform.

  • effect of metal transfer mode on spatter and arc stability in underwater Flux Cored Wire wet welding
    Journal of Manufacturing Processes, 2018
    Co-Authors: Yunlong Fu, Yongpeng Du, Hao Chen, Changsheng Xu, Jicai Feng
    Abstract:

    Abstract The effect of metal transfer mode on spatter and arc stability during underwater Flux-Cored Wire wet welding at different process parameters are investigated adopting the synchronous acquisition system of X-ray image and electric signal. Two spatter modes i.e. the local droplet repelled spatter and the droplet explosion spatter were observed for the first time. The generation of the local droplet repelled spatter is attributed to the excessive and unstable repulsive forces, while the droplet explosion spatter is caused by the unstable repulsive forces and gas dynamic force. Welding spatters and arc stability depend on the metal transfer mode. During wide-angle globular repelled transfer mode, the droplet repelled spatter mode is observed and the forming frequencies of the local droplet repelled spatter and droplet explosion spatter are higher than other transfer modes. The short-circuit explosions are observed in short-circuit explosive transfer mode, causing numerous short-circuit explosive spatters. With the increase of arc voltage, both the spatter loss coefficient and voltage variation coefficient decrease firstly to the minimum at the arc voltage of 32 V and then increases gradually, attributed to the type and proportion of metal transfer mode.

  • effects of welding velocity on metal transfer mode and weld morphology in underwater Flux Cored Wire welding
    Journal of Materials Processing Technology, 2017
    Co-Authors: Yunlong Fu, Yongpeng Du, Jicai Feng, Yongpeng Wang, Zongquan Deng
    Abstract:

    Abstract Metal transfer process in underwater Flux-Cored welding are investigated by X-ray transmission method for welding velocity from 0.5 mm/s to 9.5 mm/s. The metal transfer mode of underwater Flux-Cored Wire welding is the mixed transfer mode mainly composed of four fundamental transfer modes i.e. wide-angle globular repelled transfer mode, small-angle globular repelled transfer mode, surface tension transfer mode and short-circuit transfer mode. The category and proportion of fundamental modes constituting the mixed mode depend strongly on the welding velocity owing to the variation of force condition on droplet. With increasing welding velocity, the proportion of the wide-angle globular repelled transfer mode increases continually while that of the surface tension transfer mode and short-circuit transfer mode decreases, and the proportion of the small-angle globular repelled transfer increases firstly and then decreases gradually. The welding appearance and cross-sectional macrostructure of weld specimens at different welding velocities are also investigated. When the welding velocity increases from 0.5 mm/s to 3.5 mm/s, the weld width decreases from 20 mm to 12 mm and the weld penetration increases rapidly from 0.8 mm to 3.7 mm, completely different from in-air welding.

  • effect of boric acid on metal transfer mode of underwater Flux Cored Wire wet welding
    Journal of Materials Processing Technology, 2015
    Co-Authors: Yongpeng Du, Yunlong Fu, Jicai Feng
    Abstract:

    Abstract For obtaining high quality of underwater welding repairing for nuclear power equipments, the influence of boric acid on metal transfer process of underwater Flux-Cored Wire wet welding in boric acid solution is explored by an X-ray transmission system. The research results show that the mixed repelled globular transfer and solid short circuit transfer mode and the mixed repelled globular transfer and surface tension transfer mode are two kinds of main metal transfer modes during underwater welding in boric acid solution. The proportion of the mixed repelled globular transfer and surface tension transfer mode is increasing with the increasing of concentration of boric acid solution, which is caused by the difference of force condition of the droplet.

  • metal transfer in underwater Flux Cored Wire wet welding at shallow water depth
    Materials Letters, 2015
    Co-Authors: Meirong Wang, Yongpeng Du, Jicai Feng
    Abstract:

    Abstract The metal transfer process of underwater Flux-Cored Wire wet welding is successfully observed by an X-ray transmission method. The relatively large retention forces acting on the droplet induced by the electromagnetic force, vaporization force, surface tension resultant force and gas flow drag force make the transfer mode as a combination of globular repelled transfer mode and short circuit transfer mode with the average transfer frequency of 4.3 Hz with arc voltage of 24 V and welding current of 240 A.

Yunlong Fu - One of the best experts on this subject based on the ideXlab platform.

  • effect of metal transfer mode on spatter and arc stability in underwater Flux Cored Wire wet welding
    Journal of Manufacturing Processes, 2018
    Co-Authors: Yunlong Fu, Yongpeng Du, Hao Chen, Changsheng Xu, Jicai Feng
    Abstract:

    Abstract The effect of metal transfer mode on spatter and arc stability during underwater Flux-Cored Wire wet welding at different process parameters are investigated adopting the synchronous acquisition system of X-ray image and electric signal. Two spatter modes i.e. the local droplet repelled spatter and the droplet explosion spatter were observed for the first time. The generation of the local droplet repelled spatter is attributed to the excessive and unstable repulsive forces, while the droplet explosion spatter is caused by the unstable repulsive forces and gas dynamic force. Welding spatters and arc stability depend on the metal transfer mode. During wide-angle globular repelled transfer mode, the droplet repelled spatter mode is observed and the forming frequencies of the local droplet repelled spatter and droplet explosion spatter are higher than other transfer modes. The short-circuit explosions are observed in short-circuit explosive transfer mode, causing numerous short-circuit explosive spatters. With the increase of arc voltage, both the spatter loss coefficient and voltage variation coefficient decrease firstly to the minimum at the arc voltage of 32 V and then increases gradually, attributed to the type and proportion of metal transfer mode.

  • effects of welding velocity on metal transfer mode and weld morphology in underwater Flux Cored Wire welding
    Journal of Materials Processing Technology, 2017
    Co-Authors: Yunlong Fu, Yongpeng Du, Jicai Feng, Yongpeng Wang, Zongquan Deng
    Abstract:

    Abstract Metal transfer process in underwater Flux-Cored welding are investigated by X-ray transmission method for welding velocity from 0.5 mm/s to 9.5 mm/s. The metal transfer mode of underwater Flux-Cored Wire welding is the mixed transfer mode mainly composed of four fundamental transfer modes i.e. wide-angle globular repelled transfer mode, small-angle globular repelled transfer mode, surface tension transfer mode and short-circuit transfer mode. The category and proportion of fundamental modes constituting the mixed mode depend strongly on the welding velocity owing to the variation of force condition on droplet. With increasing welding velocity, the proportion of the wide-angle globular repelled transfer mode increases continually while that of the surface tension transfer mode and short-circuit transfer mode decreases, and the proportion of the small-angle globular repelled transfer increases firstly and then decreases gradually. The welding appearance and cross-sectional macrostructure of weld specimens at different welding velocities are also investigated. When the welding velocity increases from 0.5 mm/s to 3.5 mm/s, the weld width decreases from 20 mm to 12 mm and the weld penetration increases rapidly from 0.8 mm to 3.7 mm, completely different from in-air welding.

  • effect of boric acid on metal transfer mode of underwater Flux Cored Wire wet welding
    Journal of Materials Processing Technology, 2015
    Co-Authors: Yongpeng Du, Yunlong Fu, Jicai Feng
    Abstract:

    Abstract For obtaining high quality of underwater welding repairing for nuclear power equipments, the influence of boric acid on metal transfer process of underwater Flux-Cored Wire wet welding in boric acid solution is explored by an X-ray transmission system. The research results show that the mixed repelled globular transfer and solid short circuit transfer mode and the mixed repelled globular transfer and surface tension transfer mode are two kinds of main metal transfer modes during underwater welding in boric acid solution. The proportion of the mixed repelled globular transfer and surface tension transfer mode is increasing with the increasing of concentration of boric acid solution, which is caused by the difference of force condition of the droplet.

Zongquan Deng - One of the best experts on this subject based on the ideXlab platform.

  • effects of welding velocity on metal transfer mode and weld morphology in underwater Flux Cored Wire welding
    Journal of Materials Processing Technology, 2017
    Co-Authors: Yunlong Fu, Yongpeng Du, Jicai Feng, Yongpeng Wang, Zongquan Deng
    Abstract:

    Abstract Metal transfer process in underwater Flux-Cored welding are investigated by X-ray transmission method for welding velocity from 0.5 mm/s to 9.5 mm/s. The metal transfer mode of underwater Flux-Cored Wire welding is the mixed transfer mode mainly composed of four fundamental transfer modes i.e. wide-angle globular repelled transfer mode, small-angle globular repelled transfer mode, surface tension transfer mode and short-circuit transfer mode. The category and proportion of fundamental modes constituting the mixed mode depend strongly on the welding velocity owing to the variation of force condition on droplet. With increasing welding velocity, the proportion of the wide-angle globular repelled transfer mode increases continually while that of the surface tension transfer mode and short-circuit transfer mode decreases, and the proportion of the small-angle globular repelled transfer increases firstly and then decreases gradually. The welding appearance and cross-sectional macrostructure of weld specimens at different welding velocities are also investigated. When the welding velocity increases from 0.5 mm/s to 3.5 mm/s, the weld width decreases from 20 mm to 12 mm and the weld penetration increases rapidly from 0.8 mm to 3.7 mm, completely different from in-air welding.

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