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.
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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",
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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.