A NON-EUTECTIC STRUCTURE WELD JOINT OF COPPER-ALUMINUM THIN WALL PIPE AND ITS MANUFACTURING METHOD

Title:

A NON-EUTECTIC STRUCTURE WELD JOINT OF COPPER-ALUMINUM THIN WALL PIPE AND ITS MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2008/034320

Kind Code:

A1

Abstract:

A non-eutectic structure weld joint of copper-aluminum thin wall pipe and its manufacturing method are disclosed. The copper and aluminum combined pipe weld joint is characterized in that a weld seam is between the cone welding section of the copper pipe and the inner wall of the aluminum pipe, a chemical bond is directly formed in the weld seam and there is no copper-aluminum eutectic structure on the weld seam. The manufacturing method includes the following steps: prearranging a metal core rod in inner necked-in end of the copper pipe welding part; disposing a felder on corresponding place of a fixed electrode group; pushing a travelling electrode group with copper pipe to the aluminum pipe by a pushing cylinder when welding, while heating the copper-aluminum bonding pad with resistance, the copper pipe being moved continuously to the inner part of the aluminum pipe by the pushing cylinder; drawing out the metal core rod after cutting off power. The invention copper-aluminum weld joint has a directly chemical bond between the copper and the aluminum pipe, and there is no eutectic structure on weld seam, so the weld seam has a high intensity and sealing performance, which especially widely adaptive to refrigerating industry.

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Inventors:

ZUO TIEJUN (CN)
ZHAO YUE (CN)

Application Number:

PCT/CN2007/001788

Publication Date:

March 27, 2008

Filing Date:

June 06, 2007

Export Citation:

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Assignee:

ZUO TIEJUN (CN)
ZHAO YUE (CN)

International Classes:

F16L13/02; B23K11/20

Foreign References:

JPH1133747A	1999-02-09
JP2003139442A	2003-05-14
JP2004291019A	2004-10-21
CN2677719Y	2005-02-09
CN2767802Y	2006-03-29

Attorney, Agent or Firm:

NIE, Lei (Suite 3-102 Hejingyuan Building A,Jimenli,Haidian District, Beijing 8, CN)

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