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Copper-aluminum cold pressure welding process for refrigerator evaporator

A technology for evaporators and refrigerators, applied in non-electric welding equipment, applications, household appliances, etc., can solve the problems of many process parameters, difficult to control, complex equipment, etc., and achieve the effect of simple process, easy operation, and few welding parameters

Inactive Publication Date: 2017-03-29
SUIYANG COUNTY NAIHUAN ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have many process parameters, complex equipment, and are difficult to control; these methods all belong to the category of hot-press welding, and the metal on the joint surface is heated during the welding process, and even partially melts.

Method used

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  • Copper-aluminum cold pressure welding process for refrigerator evaporator

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Embodiment Construction

[0026] The present invention will be described in further detail below by means of specific embodiments:

[0027] The copper-aluminum tube cold pressure welding process for the refrigerator evaporator is composed of the following parts:

[0028] 1. Processing of weldments

[0029] Before welding, the annealed copper tube and aluminum tube should be processed into end faces to be welded after chemical treatment, and the end faces of copper tubes to be welded are grooved along the outer diameter. Grind the metal surface of the welding area with a rotating wire brush, clean the small mandrel made of hard aluminum wire with acetone or gasoline, and place it in the copper tube and aluminum tube with pliers; use the positioning rod to position the mandrel on the copper tube. position in the tube. Put the copper tube and aluminum tube into the clamp of the cold press welding machine, and pull out the positioning rod.

[0030] 2. Cold pressure welding

[0031] Start the cold press...

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Abstract

The invention discloses a copper-aluminum cold pressure welding process for a refrigerator evaporator. The process is composed of four steps: treatment of a to-be-welded piece; a cold pressure welding process of an aluminum tube; thickening of a bonding surface; weldment forming; and cleaning. Threaded holes are machined at two ends of the copper-aluminum tube, and anti-loosening bolts are mounted in the threaded holes. No brittle alloy layer is available at the copper-aluminum bonding face manufactured by the process, the joint is good in compactness, and the copper-aluminum tube joint is good in quality.

Description

technical field [0001] The invention relates to a manufacturing process of a refrigerator evaporator, in particular to a copper-aluminum tube cold pressure welding process for the refrigerator evaporator. Background technique [0002] At present, the welding methods of copper-aluminum tube adapters in refrigerator refrigeration systems include flash welding, capacitor energy storage welding, resistance welding and friction welding. These methods have many process parameters, complex equipment, and are difficult to control; these methods all belong to the category of hot-press welding, and the metal on the joint surface is heated during the welding process, and even partially melts. It is difficult to squeeze the molten metal and the interface layer metal out of the bonding surface during extrusion. Then the liquid metal film remaining in the bonding surface and the metal inter-diffusion at high temperature form a brittle alloy layer. This brittle alloy layer is composed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23P15/00B23K20/24B23K101/06B23K103/18
CPCB23K20/001B23K20/24B23K2101/06B23K2103/18B23P15/00
Inventor 曾祥斌
Owner SUIYANG COUNTY NAIHUAN ALUMINUM IND
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