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Method and apparatus for hybrid welding under shielding gas

Imported: 23 Feb '17 | Published: 22 Oct '02

Stefan Trube, Ernst Miklos, Jürgen Scholz

USPTO - Utility Patents

Abstract

A hybrid welding from a combination of laser beam welding with gas-shielded welding by electric arc uses at least two electrodes are used. The electrodes can be flooded by a common shielding gas curtain or separately or in groups. The hybrid welding increases the possibility of influencing the welding process and especially provides improved possibilities for automation.

Description

BRIEF DESCRIPTION OF THE DRAWING

The sole FIGURE schematically shows hybrid welding under a shielding gas using two electrodes.

Claims

1. A method for gas-shielded hybrid welding by laser beam and arc, comprising:

2. A method of claim 1, wherein the first and second electrodes are consumable or non-consumable electrodes.

3. A method of claim 1, wherein each electrode is flooded by a separate shielding-gas curtain.

4. A method of claim 1, wherein a plurality of electrodes are flooded by a common shielding-gas curtain.

5. A method of claim 4, wherein all electrodes are flooded by a common shielding-gas curtain.

6. A method of claim 1, wherein the first and second electrodes are connected to one electrical potential.

7. A method of claim 1, wherein the first and second electrodes are connected to separate electrical potentials.

8. A method of claim 1, wherein a group of electrodes is connected to a same electrical potential.

9. A method of claim 1, wherein the first and second electrodes are arranged in a same plane perpendicular to a laser beam axis.

10. A method of claim 1, wherein the first and second electrodes are arranged in a same plane parallel to a workpiece surface.

11. A method of claim 1, wherein the first and second electrodes are arranged in different planes perpendicular to a laser beam axis.

12. A method of claim 1, wherein the first and second electrodes are arranged in different planes parallel to a workpiece surface.

13. A method of claim 1, wherein an arc burns between one electrode or a plurality of electrodes and the workpiece.

14. A method of claim 1, wherein an arc burn between the first and second electrodes.

15. A method of claim 1, further comprising:

16. An apparatus for gas-shielded hybrid welding by laser beam and arc, comprising:

17. An apparatus of claim 16, wherein the first and second electrodes are consumable or non-consumable electrodes.

18. An apparatus of claim 16, wherein the means for feeding shielding gas is arranged to provide that each electrode is flooded by a separate shielding-gas curtain.

19. An apparatus of claim 16, wherein the means for feeding shielding gas is arranged to provide that a plurality of electrodes are flooded by a common shielding-gas curtain.

20. An apparatus of claim 16, wherein the first and second electrodes are connected to one electrical potential or to separate electrical potentials.

21. An apparatus of claim 16, wherein a group of electrodes is connected to one electrical potential.

22. An apparatus of claim 16, wherein the electrodes are arranged in same or different planes perpendicular to a laser beam axis.

23. An apparatus of claim 16, wherein the electrodes are arranged in same or different planes perpendicular to a laser beam axis.

24. An apparatus of claim 16, wherein in arc burns between one electrode or a plurality of electrodes and the workpiece.

25. An apparatus of claim 16, wherein an arc burns between the first and second electrodes.

26. An apparatus of claim 16, wherein the welding torch produces additional electric arcs by additional electrodes and further wherein the at last one focused laser beam, the first electric arc, the second electric arc, and the additional electric arcs all simultaneously weld the workpiece in a single interaction zone of plasma and molten metal.

27. A method for gas-shielded hybrid welding by laser beam and arc, comprising:

28. A method of claim 27, wherein the first and second electrodes are consumable or non-consumable electrodes.

29. A method of claim 27, wherein each electrodes is flooded by a separate shielding-gas curtain.

30. A method of claim 27, wherein a plurality of electrodes are flooded by a common shielding-gas curtain.

31. A method of claim 30, wherein all electrodes are flooded by a common shielding-gas curtain.

32. A method of claim 27, wherein the first and second electrodes are connected to one electrical potential.

33. A method of claim 27, wherein the first and second electrodes are connected to separate electrical potentials.

34. A method of claim 27, wherein a group of electrodes is connected to a same electrical potential.

35. A method of claim 27, wherein the first and second electrodes are arranged in a same plane perpendicular to a laser beam axis.

36. A method of claim 27, wherein the first and second electrodes are arranged in a same plane parallel to a workpiece surface.

37. A method of claim 27, wherein the first and second electrodes are arranged in different planes perpendicular to a laser beam axis.

38. A method of claim 27, wherein the first and second electrodes are arranged in different planes parallel to a workpiece surface.

39. A method of claim 27, wherein an arc burns between one electrode or a plurality of electrodes and the workpiece.

40. A method of claim 27, wherein an arc burns between the first and second electrodes.

41. A method of claim 27, further comprising:

42. An apparatus for gas-shielded hybrid welding by laser beam and arc, comprising:

43. An apparatus of claim 42, wherein the first and second electrodes are consumable or non-consumable electrodes.

44. An apparatus of claim 42, wherein each electrode is flooded by a separate shielding-gas curtain.

45. An apparatus of claim 42, wherein each electrode is flooded by a common shielding-gas curtain.

46. An apparatus of claim 42, wherein the first and second electrodes are connected to one electrical potential or to separate electrical potentials.

47. An apparatus of claim 42, wherein a group of electrodes is connected to on e electrical potential.

48. An apparatus of claim 42, wherein the electrodes are arranged in same or different planes perpendicular to a laser beam axis.

49. An apparatus of claim 42, wherein the electrodes are arranged in same or different planes parallel to a workpiece surface.

50. An apparatus of claim 42, wherein an arc burns between one electrode or a plurality of electrodes and the workpiece.

51. An apparatus of claim 42, wherein an arc burns between the first and second electrodes.

52. An apparatus of claim 42, wherein the welding torch produces additional electric arcs by additional electrodes and further wherein the at least one focused laser beam, the first electric arc, the second electric arc, and the additional electric arcs all simultaneously weld the workpiece in a single interaction zone of plasma and molten metal.