Laser fillet welding

• US 7,767,318 B2
• Filed: 01/30/2007
• Issued: 08/03/2010
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: Turbine Overhaul Services Pte Ltd. (Japan Post Holdings Company Limited), United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX), Aventis Pharma Deutschland GmbH (Sanofi )
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Cheng, Kenny, Luah, Kok Hai
• Primary Examiner(s): Evans; Geoffrey S
• Application Number:
  US11/699,967
• Publication Number:
  US 20080118768A1
• Time in Patent Office: 1,281 Days
• Field of Search: 219/121.63, 219/121.64, 403/270, 403/271, 403/272, 148/525, 428/594, 428/596, 428/615
• US Class Current: 428/696
• CPC Class Codes: B23K 2101/001 Turbines
• CPC Class Codes: B23K 26/144 the fluid stream containing particles, e.g. powder
• CPC Class Codes: B23K 26/24 Seam welding
• CPC Class Codes: Y10T 428/12361 having aperture or cut
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]

Abstract

A metal article and a method for welding the metal parts to form the metal article, where the method comprises feeding filler material to an intersection of the metal parts, and melting the filler material with a laser beam to form a weld between the metal parts at the intersection.

Claims

1. A method for welding a first metal part to a second metal part, the method comprising:

forming an intersection between the first metal part and the second metal part;

feeding powdered filler material to the intersection; and

melting the powdered filler material with a laser beam, thereby allowing the melted powdered filler material to fuse to the first metal part and the second metal part to form a weld at the intersection, wherein the weld has a penetration depth into the second metal part and a weld leg length from the first metal part, the penetration depth being less than about 10% of the weld leg length, and wherein the heat affected zone is reduced to substantially eliminate formation of cracks and large pores.

2. The method of claim 1, wherein the laser beam has a focal point located at the intersection.

3. The method of claim 1, wherein the weld extends around an entire perimeter of the first metal part.

4. The method of claim 1, wherein forming the intersection comprises positioning the first metal part flush with a surface of the second metal part.

5. A metal article comprising:

a first metal part having a surface;

a second metal part having an edge portion disposed adjacent the surface of the first metal part; and

a laser powder fusion interconnecting the first metal part and the edge portion of the second metal part to form a laser fillet weld, wherein the laser fillet weld has a penetration depth into the second metal part and a weld leg length from the first metal part, the penetration depth being less than about 10% of the weld leg length, and wherein the heat affected zone is reduced to substantially eliminate formation of cracks and large pores.

6. The metal article of claim 5, wherein the laser fillet weld secures the surface of the first metal part to the edge portion of the second metal part with a filler material.

7. The metal article of claim 5, wherein the first metal part is a blade root having an inlet aperture disposed within the surface, and wherein the second metal part is a meter plate secured over the inlet aperture.

8. The metal article of claim 7, wherein the surface is selected from the group consisting of an end wall surface of the blade root and a front face surface of the blade root.

9. The metal article of claim 5, wherein the laser fillet weld extends around an entire perimeter of the second metal part.