Hybrid laser welding of 5xxx series aluminium alloys (2) Wim Van Haver Research Center of the Belgian Welding Institute Gent (B)

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Presentation transcript:

Hybrid laser welding of 5xxx series aluminium alloys (2) Wim Van Haver Research Center of the Belgian Welding Institute Gent (B)

Benelux Laser Event - 26/04/05-27/04/05 2 Overview Project ALUWELD Aluminium alloys (5xxx series) Experimental results Further research projects Conclusions

Benelux Laser Event - 26/04/05-27/04/05 3 Project ALUWELD Innovative welding of high strength aluminium alloys with the Friction Stir Welding (FSW) en Hybrid Laser Welding (HLW) techniques 50% of fundings by IWT-Vlaanderen (IWT 30909) Duration: Both welding processes have in common:  low loss in strength  low deformation  fully automatic Aims:  Building up base knowledge about both FSW and HLW  Demonstrating the capabilities of FSW and HLW on relevant aluminium alloys for the industrial project members FSW:FSW: 2024-T3, 5754-O, 5182-H111, 5083-H111, 6056-T4, 6061-T6, 7475, AC HLW:HLW:5083-H111, 5754-O, 5182-H111, 6056-T4, 6061-T6, 6082-T6, AC  Modelling  Comparison with « traditional » welding processes

Benelux Laser Event - 26/04/05-27/04/05 4 Aluminium alloys: subdivision  1xxx: Al with different degrees of purity (> 99%)  2xxx: Al-Cu(Mg)  3xxx: Al-Mn  4xxx: Al-Si  5xxx: Al-Mg  6xxx: Al-MgSi  7xxx: Al-ZnMg(Cu)  8xxx: « specialty alloys » (e.g. Al-Sn) Aluminium wrought alloys (rolled products/extrusions): « series » based on chemical composition Depending on the chemical composition:

Benelux Laser Event - 26/04/05-27/04/05 5 Al 5xxx series: properties Al-Mg alloys Non-precipitation hardenable Strength increase by cold deformation only Important influence of Mg on strength Very good corrosion resistance (but ICC/SCC possible) Good weldable Typical applications of 5xxx series:  Welded structures, storage tanks, structural sheet… 5xxx Al-alloys within the project: 5083, 5754 and

Benelux Laser Event - 26/04/05-27/04/05 6 5xxx Al-legeringen within the project Supplied by industrial project members:  5083-H111 sheets Al Mg4,5Mn0,7(5-8 mm) Cryogenic applications, structural applications, piping and tubing…  5754-O sheets Al Mg3 (4 mm) Nuclear, chemical and food industry, load floors, pressure vessels…  5182-H111 sheets Al Mg4,5Mn0,4 (1,5 mm) Packaging, automotive industry 5754-O5182-H H111

Benelux Laser Event - 26/04/05-27/04/05 7 HLW experimental results: 5083 (1) Optimization process  Laser-MIG distance (0 – 4 mm)  Welding speed (0,4 – 2,4 m/min)  Laser power  Consumable: 4043 (Al Si5) 5183 (Al Mg4,5Mn)  Shielding gas: pure Ar « Astec » (70% Ar – 30% He) lower strength no improvement (porosity)

Benelux Laser Event - 26/04/05-27/04/05 8 HLW experimental results: 5083 (2) Radiography + tensile testing: porosity 267 MPa Laser-MIG: 2 mm 2 m/min no porosity 269 MPa Laser-MIG: 2 mm 1,5 m/min few porosity 277 MPa 283 MPa Laser-MIG: 1 mm 1,5 m/min porosity 282 MPa 288 MPa 219 MPa Laser-MIG: 1 mm 2 m/min

Benelux Laser Event - 26/04/05-27/04/05 9 HLW experimental results: 5754 (1) Optimization process  Laser-MIG distance (1 – 4 mm)  Welding speed (1,2 – 2,7 m/min)  Laser power  Consumable: 4043 (Al Si5) 5183 (Al Mg4,5Mn)  Shielding gas: pure Ar « Astec » (70% Ar – 30% He) lower strength based on 5083 results

Benelux Laser Event - 26/04/05-27/04/05 10 HLW experimental results: 5754 (2) Radiography + tensile testing: Laser-MIG: 2 mm 2 m/min 2 porosities of 0,5 mm diameter 221 MPa Laser-MIG: 2 mm 1,5 m/min fracture initiation on undercut of weld face 226 MPa Laser-MIG: 1 mm 1,5 m/min fractured in HAZ 228 MPa Laser-MIG: 1 mm 2 m/min fracture initiation on root, much porosity (RX) 230 MPa

Benelux Laser Event - 26/04/05-27/04/05 11 HLW experimental results: 5754 (3) Optimized welds:  Tensile testing: fractured in base material  Passed both root and face bend test (3*t) over 180°  Low degree of porosity  No softening in HAZ

Benelux Laser Event - 26/04/05-27/04/05 12 HLW experimental results: 5182 (1) Laser beam welding alone:  Welding speeds up to 8,4 m/min  Strength increases with higher welding speed Hybrid laser welding:  Welding speed: 3,6 m/min up to 8,4 m/min, laser-MIG = 4 mm  Tensile strength too low at highest welding speeds

Benelux Laser Event - 26/04/05-27/04/05 13 HLW experimental results: 5182 (2) 2000 µm TS: 285 MPa, 289 MPa Bend tests ok Misalignment TS: 269 MPa, 270 MPa Failed root bend test Porosity TS: 246 MPa, 252 MPa Bend tests ok Problems on root side

Benelux Laser Event - 26/04/05-27/04/05 14 Project proposals « ALUWELD II » (BWI, VITO, UCL-PRM, Cenaero...)  FSW and HLW  Modelling  Other materials: other Al-alloys, Mg, Ti, Cu, thermoplastics, steel…  Dissimilar joints (e.g. Al to Mg)  Other weld geometries, application-based « HYLAS » (BWI, VITO...)  Hybrid laser welding of steel  Comparison with laser welding and arc welding  Steels: C-Mn, stainless steels, Zn-coated steel… Relatively limited input from your company! Contacts:  Wim Van Haver, BWI  Jo Verwimp,

Benelux Laser Event - 26/04/05-27/04/05 15 Conclusions Very promising results for 5xxx series:  High productivity (welding speed > 1 m/min)  Good weld quality (strength, porosity) Further research is being carried out within project ALUWELD ( ) 2 BWI project proposals (in cooperation with Laser Center Flanders) for concerning HLW:  ALUWELD II (FSW & HLW)  Hybrid Laser Welding of steel

Benelux Laser Event - 26/04/05-27/04/05 16 Thank you for your attention.