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Surface Brazing Method of Aluminum Alloy Components

A technology of aluminum alloy components and surface brazing, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., to achieve the effects of low cost, suppression of void defects, and stable quality

Active Publication Date: 2015-08-19
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is a very difficult technology compared with the above-mentioned brazing technology based on the formation of the brazed seam

Method used

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  • Surface Brazing Method of Aluminum Alloy Components
  • Surface Brazing Method of Aluminum Alloy Components
  • Surface Brazing Method of Aluminum Alloy Components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] Production of brazing sheets

[0088] Measure and match the various blanks specified, and put 9kg (total 13 samples) of raw materials into the #30 crucible coated with the release material for filling. These crucibles were inserted into an electric furnace and melted at 760°C to remove slag, and then the temperature of the melt was kept at 740°C. Next, nitrogen gas was blown into the melt at a flow rate of 1 Nl / min for 10 minutes using a small-sized rotary degassing device to perform degassing treatment. Then, it was allowed to stand still for 30 minutes, and the slag floating on the surface of the molten liquid was removed with a stirring bar, and a disk-shaped sample was collected in a mold for component analysis with a spoon.

[0089] Next, the crucibles were sequentially taken out of the electric furnace using a jig, and molten aluminum was poured into five molds (70mm×70mm×15mm) preheated to 200°C. The disc-shaped samples of each sample were subjected to compos...

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Abstract

Disclosed is a flux-free method of surface brazing two aluminum alloy members using a single-layer brazing sheet. While maintaining the brazing temperature at 570C or greater in an inert gas atmosphere and while applying a surface pressure of at least 0.6 gf / mm2, the aluminum alloy members, which have a solidus temperature of 570C or greater, are brazed flux-free in a state in which a single-layer brazing sheet 15-200µm thick comprising a brazing material (having a component composition of 3-12 mass% Si, 0.1-5.0 mass% Mg, and the remaining portion consisting of Al and unavoidable impurities) is positioned between and in surface contact with the aluminum alloy members.

Description

technical field [0001] The present invention relates to a method of surface-brazing aluminum alloy members to each other in an inert gas atmosphere using a brazing sheet without using flux. Background technique [0002] For example, as can be seen in the brazing of the fin material and the tube material of the aluminum heat exchanger, the brazing technology until now basically obtains a line contact such as the shape of the brazed seam. In such a brazing method, for example, when the lower plate is a brazing sheet on which a plate-shaped fin is vertically joined, molten brazing material flows on the brazing sheet to form a brazing seam. [0003] In the brazing technology based on such line contact, in order to suppress oxidation during brazing heating, brazing with flux is generally performed in the air or in an inert gas atmosphere. However, in recent years, a method has been developed in which three or five clad layers are formed, and a brazing sheet clad with an Al-Si al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/00B23K31/02B23K35/14B23K35/22B23K35/28C22C21/00C22F1/043B23K35/40B23K101/14B23K103/10C22F1/00
CPCB23K1/19B23K35/0233B23K35/383B23K35/286C22C21/02B23K2203/10C22C21/04B23K2103/10B23K1/00B23K31/02B23K35/02
Inventor 小久保贵训堀久司佐佐木智浩
Owner NIPPON LIGHT METAL CO LTD
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