127 april 2005 benelux laser event 2005 hybrid laser welding of aluminium jo verwimp lasercentrum...
TRANSCRIPT
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127 april 2005Benelux Laser Event 2005
HYBRID LASER WELDING
of Aluminium
Jo VerwimpLasercentrum Vlaanderen
VITO
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227 april 2005Benelux Laser Event 2005
OUTLINE
1. The process
2. Synergies
3. Process combination
4. Process parameters
5. Experimental process parameter determination
6. Joint geometries
7. Experimental setup LCV
8. Applications
9. Demonstration
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327 april 2005Benelux Laser Event 2005
The process
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427 april 2005Benelux Laser Event 2005
Synergies
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527 april 2005Benelux Laser Event 2005
Process combination
+ =
Laser only MIG only Laser + MIGhybrid
Alu 6082 T6, thickness 4 mmWelding speed = 1.2 m/minNd:YAG Laser power = 3.8 KWMIG parameters: 90 A, 16 V, wire speed = 2.2 m/min
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627 april 2005Benelux Laser Event 2005
Process parameters (1)
Arc:• Voltage • Current• Power source (DC, AC, pulse)• Pulse frequency • Stick out
Wire:• Speed• Diameter• Type
Other:• Torch orientation• Gas shielding• Edge preparation
Source:• Type (CO2 , Nd:YAG, ...)• Power• (Pulse frequency)
Optics:• Focal length• Spot size• Focal position• Single – double focus
Other:• Welding speed• Gas shielding• Edge preparation
MIG LASER
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727 april 2005Benelux Laser Event 2005
Process parameters (2): interactions
Distance between laser focal point & impingement of the arc:• Determination of weld pool geometry• Bigger weld pool = easier outgassing• Small distance: interaction laser – MIG• Larger distance: interaction will become negligible
Geometrical formation of laser beam and arc torch• Angle between laser & MIG (normally fixed to 30°)• Laser leading or trailing (normally laser leading)
Shielding gas• CO2 laser: helium needed (to suppress plasma formation)• Nd:YAG: Ar pure or Ar/He (He gives higher penetration)
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827 april 2005Benelux Laser Event 2005
Experimental process parameter determination
1. Laser only: determination of laser power- full weld penetration
2. Hybrid: determination of MIG parameters, based on:- visual inspection on weld appearance- no undercut, full penetration
3. Hybrid: interaction parameters- distance laser/MIG and gas shielding
4. Hybrid: fine tuning of laser & MIG parameters, based on- visual inspection, RX inspection- tensile tests, bend tests
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927 april 2005Benelux Laser Event 2005
Joint geometries
Single: max. 5; double max. 8mm Fillet or Lap joint: max. 5 mm
Lap-joint: max. 4 mm T-joint: single 4, double max. 6mm
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1027 april 2005Benelux Laser Event 2005
Experimental setup LCV
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1127 april 2005Benelux Laser Event 2005
Applications
Audi A8: Neckersulm
AutomotiveVolkswagen: WolfsburgAudi: NeckersulmMitsubishi: alu space frameAviationAirbus GermanyResearchUniversity of AachenFraunhofer Laser InstituteForce Denmark, VitoCSIRO Melbourne, Institut de Soudure (FR)TWI Cambridge, JWRI OsakaOther businessesPiping, shipbuilding, construction, ...
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1227 april 2005Benelux Laser Event 2005
Demonstration: alu 6061 T4, 4mm thick, 1.2 m/min
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1327 april 2005Benelux Laser Event 2005
Continuation:Experimental results by W. Van Haver
Thank you