Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding

Mohammed Sohail, Suck-Joo; Na, Miikka; Karhu, Veli Kujanpää

    Research output: Contribution to conferenceConference articleScientific

    Abstract

    The Laser-GMA hybrid welding experiments are carried out for GMA-trailing hybrid welding in full penetration. High power fiber laser welding of 10 kW with 4 mm defocusing inside the work piece is used along with pulsed Gas Metal Arc Welding. Different concentration of Cr in base metal and filler wire are used to see the mixing behavior in Laser-GMA hybrid welding. Numerical simulations are carried out using the same power, defocusing, GMAW current and voltage pulse parameters and Cr concentrations as in experiments. The laser simulations used real time multiple reflection inside keyhole and continuity, momentum, energy conservation equations are solved using volume of Fluid (VOF) model. Simulation results for GMA-trailing configuration are presented for mixing and fluid flow behavior and it found that GMA-trailing configuration is giving comparatively uniform mixing and longer pool length is found at root surface. The results for simulation and experiments are compared. The results are in fair agreement in terms of upper bead shape but the molten metal is dropping down due to gravity in simulations, thus forming undercut which is not observed in experiments. This may be due to the fact that assist gas effect is not considered in simulations.
    Original languageEnglish
    Number of pages5
    Publication statusPublished - 2015
    MoE publication typeNot Eligible
    Event7th International Congress on Laser Advanced Materials Processing, LAMP 2015 - Fukuoka, Japan
    Duration: 26 May 201529 May 2015

    Conference

    Conference7th International Congress on Laser Advanced Materials Processing, LAMP 2015
    Abbreviated titleLAMP 2015
    CountryJapan
    CityFukuoka
    Period26/05/1529/05/15

    Fingerprint

    Gas metal arc welding
    Welding
    Lasers
    Experiments
    Laser beam welding
    High power lasers
    Fiber lasers
    Liquid metals
    Fillers
    Flow of fluids
    Momentum
    Energy conservation
    Gravitation
    Wire
    Fluids
    Computer simulation
    Electric potential
    Metals
    Gases

    Keywords

    • full penetration
    • keyhole
    • fiber laser
    • hybrid Welding
    • element mixing
    • laser trailing

    Cite this

    Sohail, M., Na, S-J., Karhu, M., & Kujanpää, V. (2015). Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding. Paper presented at 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, Fukuoka, Japan.
    Sohail, Mohammed ; Na, Suck-Joo; ; Karhu, Miikka; ; Kujanpää, Veli. / Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding. Paper presented at 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, Fukuoka, Japan.5 p.
    @conference{f8c898e9b0904afe8fc46c49350281aa,
    title = "Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding",
    abstract = "The Laser-GMA hybrid welding experiments are carried out for GMA-trailing hybrid welding in full penetration. High power fiber laser welding of 10 kW with 4 mm defocusing inside the work piece is used along with pulsed Gas Metal Arc Welding. Different concentration of Cr in base metal and filler wire are used to see the mixing behavior in Laser-GMA hybrid welding. Numerical simulations are carried out using the same power, defocusing, GMAW current and voltage pulse parameters and Cr concentrations as in experiments. The laser simulations used real time multiple reflection inside keyhole and continuity, momentum, energy conservation equations are solved using volume of Fluid (VOF) model. Simulation results for GMA-trailing configuration are presented for mixing and fluid flow behavior and it found that GMA-trailing configuration is giving comparatively uniform mixing and longer pool length is found at root surface. The results for simulation and experiments are compared. The results are in fair agreement in terms of upper bead shape but the molten metal is dropping down due to gravity in simulations, thus forming undercut which is not observed in experiments. This may be due to the fact that assist gas effect is not considered in simulations.",
    keywords = "full penetration, keyhole, fiber laser, hybrid Welding, element mixing, laser trailing",
    author = "Mohammed Sohail and Suck-Joo; Na and Miikka; Karhu and Veli Kujanp{\"a}{\"a}",
    note = "Project code: 83437 ; 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, LAMP 2015 ; Conference date: 26-05-2015 Through 29-05-2015",
    year = "2015",
    language = "English",

    }

    Sohail, M, Na, S-J, Karhu, M & Kujanpää, V 2015, 'Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding', Paper presented at 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, Fukuoka, Japan, 26/05/15 - 29/05/15.

    Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding. / Sohail, Mohammed; Na, Suck-Joo; Karhu, Miikka; Kujanpää, Veli.

    2015. Paper presented at 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, Fukuoka, Japan.

    Research output: Contribution to conferenceConference articleScientific

    TY - CONF

    T1 - Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding

    AU - Sohail, Mohammed

    AU - Na, Suck-Joo;

    AU - Karhu, Miikka;

    AU - Kujanpää, Veli

    N1 - Project code: 83437

    PY - 2015

    Y1 - 2015

    N2 - The Laser-GMA hybrid welding experiments are carried out for GMA-trailing hybrid welding in full penetration. High power fiber laser welding of 10 kW with 4 mm defocusing inside the work piece is used along with pulsed Gas Metal Arc Welding. Different concentration of Cr in base metal and filler wire are used to see the mixing behavior in Laser-GMA hybrid welding. Numerical simulations are carried out using the same power, defocusing, GMAW current and voltage pulse parameters and Cr concentrations as in experiments. The laser simulations used real time multiple reflection inside keyhole and continuity, momentum, energy conservation equations are solved using volume of Fluid (VOF) model. Simulation results for GMA-trailing configuration are presented for mixing and fluid flow behavior and it found that GMA-trailing configuration is giving comparatively uniform mixing and longer pool length is found at root surface. The results for simulation and experiments are compared. The results are in fair agreement in terms of upper bead shape but the molten metal is dropping down due to gravity in simulations, thus forming undercut which is not observed in experiments. This may be due to the fact that assist gas effect is not considered in simulations.

    AB - The Laser-GMA hybrid welding experiments are carried out for GMA-trailing hybrid welding in full penetration. High power fiber laser welding of 10 kW with 4 mm defocusing inside the work piece is used along with pulsed Gas Metal Arc Welding. Different concentration of Cr in base metal and filler wire are used to see the mixing behavior in Laser-GMA hybrid welding. Numerical simulations are carried out using the same power, defocusing, GMAW current and voltage pulse parameters and Cr concentrations as in experiments. The laser simulations used real time multiple reflection inside keyhole and continuity, momentum, energy conservation equations are solved using volume of Fluid (VOF) model. Simulation results for GMA-trailing configuration are presented for mixing and fluid flow behavior and it found that GMA-trailing configuration is giving comparatively uniform mixing and longer pool length is found at root surface. The results for simulation and experiments are compared. The results are in fair agreement in terms of upper bead shape but the molten metal is dropping down due to gravity in simulations, thus forming undercut which is not observed in experiments. This may be due to the fact that assist gas effect is not considered in simulations.

    KW - full penetration

    KW - keyhole

    KW - fiber laser

    KW - hybrid Welding

    KW - element mixing

    KW - laser trailing

    M3 - Conference article

    ER -

    Sohail M, Na S-J, Karhu M, Kujanpää V. Numerical study on effect of laser position and joint gap on full penetration Laser-GMAW-P hybrid welding. 2015. Paper presented at 7th International Congress on Laser Advanced Materials Processing, LAMP 2015, Fukuoka, Japan.