Laser cladding with a laser scanning head

Patent metadata

Field	Value
Publication number	US-9381594-B2
Application number	US-201314071419-A
Country	US
Kind code	B2
Filing date	Nov 4, 2013
Priority date	Nov 4, 2013
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A method for laser cladding a material onto a surface of a machine component using a laser scanning head with laser scanning optics is disclosed. The method includes forming a molten bead of cladding material by directing a beam with the laser scanning optics over a bead scan on the machine component. The method also includes directing the beam with the laser scanning optics over a secondary scan on the machine component, the secondary scan being offset from the bead scan at a predetermined distance on the machine component.

First claim

What is claimed is:

1. A method for laser cladding a material onto a surface of a machine component using a laser scanning head with laser scanning optics, the method comprising:
forming a molten bead of cladding material by directing a beam with the laser scanning optics over a bead scan on the machine component; and
directing the beam with the laser scanning optics over a secondary scan on the machine component, the secondary scan being offset from the bead scan at a predetermined distance on the machine component.

2. The method of claim 1 , wherein the secondary scan is a pre-clean scan performed forward of the bead scan to clean and prepare the surface to receive a subsequent bead.

3. The method of claim 1 , wherein the secondary scan is a pre-heat scan performed forward of the bead scan to pre-heat and prepare the surface to receive a subsequent bead.

4. The method of claim 1 , wherein the secondary scan is a post-heat scan performed aft of the bead scan to re-heat a previously formed bead.

5. The method of claim 1 , wherein a first number of passes for the bead scan is performed prior to the secondary scan and a second number of passes for the bead scan is performed after the secondary scan.

6. The method of claim 2 , further comprising pre-heating the surface by directing the beam over a pre-heat scan forward of the bead scan to prepare the surface to receive a subsequent bead.

7. The method of claim 6 , further comprising post-heating a previously formed bead by directing the beam over a post-heat scan aft of the bead scan.

8. The method of claim 7 , wherein the pre-clean scan is offset from the bead scan by a first distance, the pre-heat scan is offset from the bead scan by a second distance, and the post-heat scan is offset from the bead scan by a third distance.

9. The method of claim 7 , wherein the pre-heat scan is configured to control a temperature differential between the molten bead of cladding material and a portion of the surface in contact with the molten bead of cladding material, and the post-heat scan is configured to control a cooling period of the molten bead of cladding material.

10. The method of claim 1 , wherein the laser scanning optics include minors and stepper motors that are configured to mechanically control the mirrors to redirect the beam over the bead scan and the secondary scan.

11. A method for laser cladding a material onto a surface of a machine component using a laser scanning head including laser scanning optics and a laser, the method comprising:
directing a beam of the laser with the laser scanning optics over a laser cladding cycle, the laser cladding cycle including at least one bead scanning pattern;
wherein the at least one bead scanning pattern includes a bead scan and a pre-clean scan,
the bead scan including forming a molten bead of cladding material at the surface, and
the pre-clean scan includes scanning forward of the bead scan in a cladding direction to clean a portion of the surface for a subsequent bead scan of the laser cladding cycle.

12. The method of claim 11 , wherein the at least one bead scanning pattern includes a pre-heat scan, the pre-heat scan includes scanning forward of the bead scan in the cladding direction to pre-heat a second portion of the surface for a subsequent bead scan of the laser cladding cycle.

13. The method of claim 11 , wherein the at least one bead scanning pattern includes a post-heat scan, the post-heat scan includes scanning behind the bead scan in a direction opposite the cladding direction to re-heat a previously formed bead of cladding material.

14. The method of claim 12 , wherein the at least one bead scanning pattern includes a post-heat scan, the post-heat scan includes scanning behind the bead scan in a direction opposite the cladding direction to re-heat a previously formed bead of cladding material.

15. The method of claim 11 , wherein a first number of passes for the bead scan is performed prior to the pre-clean scan and a second number of passes for the bead scan is performed after the pre-clean scan.

16. The method of claim 11 , wherein a material with a hardness above Rockwell C 45 is applied to the machine component during each bead scan.

17. The method of claim 11 , wherein a material is applied to the machine component during each bead scan of the laser cladding cycle to remanufacture the machine component.

18. A laser cladding system for cladding a material to a surface of a machine component, the laser cladding system comprising:
a laser scanning head including
a laser source which produces a beam, and
laser scanning optics which receives and directs the beam;

a laser control system including
a processor,
a beading module configured to control the laser scanning head to direct the beam with the laser scanning optics during a bead scan to form a molten bead of cladding material at the surface of the machine component, and
a pre-cleaning module configured to control the laser scanning head to direct the beam with the laser scanning optics during a pre-clean scan to remove impurities from the surface prior to a subsequent bead scan.

19. The laser cladding system of claim 18 , wherein the laser control system also includes a pre-heating module configured to control the laser scanning head to direct the beam with the laser scanning optics during a pre-heat scan to control a temperature differential between a bead of cladding material and the surface of the machine component.

20. The laser cladding system of claim 18 , wherein the laser control system also includes a post-heating module configured to control the laser scanning head to direct the beam with the laser scanning optics during a post-heat scan to control a cooling period of each bead of cladding material applied to the surface of the machine component.

Assignees

• Caterpillar Inc

Inventors

• Luick Kegan
• Marchione Thierry Andre
• Embrey Justin Curtis
• Cavanaugh Daniel
• Walker Waylon Scott

Classifications

• B23K26/342

  Build-up welding · CPC title

• B23K26/082

  Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head · CPC title

• B23K26/60

  Preliminary treatment · CPC title

• B23K26/34 Primary

  Laser welding for purposes other than joining · CPC title

• B23K26/0807

  Operations & Transport · mapped topic