Methods and apparatus for welding work pieces having dissimilar compositions

Patent metadata

Field	Value
Publication number	US-10500672-B2
Application number	US-201514925685-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Feb 4, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

The example methods and apparatus reduce and/or eliminate adverse effects of welding work pieces having dissimilar compositions. An example method includes depositing a first weld layer on a first end of a first work piece. The first work piece has a first content of a metallic element and the first weld layer has a second content of the metallic element higher than the first content. The example method includes depositing a second weld layer between the first weld layer and a second end of a second work piece to couple the first work piece to the second work piece. The second weld layer has a third content of the metallic element higher than the second content, and the second work piece has a fourth content of the metallic element higher than the first content.

First claim

What is claimed is:

1. An apparatus comprising:
a first work piece having a first content of chromium by percentage of weight or mass;
a second work piece having a second content of chromium;
a base welded between the first work piece and the second work piece to couple the first work piece to the second work piece, the base having a same content of chromium as the first work piece, the base having a first end and a second end opposite the first end;
a first weld layer deposited on the first end of the base between the first end of the base and the first work piece;
a second weld layer deposited on the second end of the base, the second weld layer having a third content of chromium higher than the first content and lower than the second content; and
a third weld layer deposited between the second weld layer and the second work piece, the third weld layer having a fourth content of chromium higher than the third content and lower than the second content.

2. The apparatus of claim 1 , wherein the first and second work pieces are pipes.

3. The apparatus of claim 1 , wherein the second weld layer forms a first bevel on the second end of the base.

4. The apparatus of claim 3 , wherein the third weld layer is deposited between the first bevel of the first weld layer and a second bevel on the second work piece.

5. The apparatus of claim 1 further comprising weld layers disposed between the second weld layer and the third weld layer, each of the weld layers having a content of chromium that is higher than an adjacent one of the weld layers.

6. The apparatus of claim 1 , wherein the first weld layer has a same content of chromium as the first work piece and the base.

Assignees

• Fisher Controls Int Llc

Inventors

• Bush Donald R
• Rohrdanz Nicholas B

Classifications

• B23K9/232 Primary

  of different metals · CPC title

• B23K9/04

  Welding for other purposes than joining, e.g. built-up welding · CPC title

• B23K9/24

  Features related to electrodes · CPC title

• B23K2103/18

  Dissimilar materials · CPC title

• B23K2103/04

  Steel {or steel} alloys · CPC title