Processes of Aluminum Alloy Sheet / Stirip Brazing

What are the processes of aluminum alloy sheet /stirip brazing ?

1. flame brazing
Flame brazing is generally used in small parts, small batch production and aluminum combined brazing. Manual flame brazing is sometimes used to connect the pipe to the socket, the elbow of the heat exchanger and other similar joint shapes. You can use air-gas or oxygen-gas torches. Adjust the brazing flame to restore the flame.



2. brazing in the furnace
When the flux is used, the aluminum alloy sheet /strip can be brazed in an oven in an air atmosphere, but it is better to use a controlled atmosphere. As the damp ingredients are removed during the drying process, solderless brazing can be achieved. Dew point In air or nitrogen atmosphere at -15 ℃, special non-corrosive flux can be used. Under argon and vacuum conditions, the flux may not be used. During brazing, it is necessary to keep the furnace temperature uniformity, the temperature of brazing work does not exceed ± 15 ℃.

3. brazing in air furnace
The brazing furnace for brazing aluminum alloy sheet /strip has many similarities to the heat treatment furnaces used for aluminum alloys. These devices are designed to operate at temperatures below 650 ℃ with a temperature control accuracy of ± 3 ℃ (eg 650 ℃ ± 3 ℃). The furnace can be made of gas or fuel and electric heating. The air inside the furnace is forced to ventilate and the temperature of the heat is equal to the temperature of the furnace. The recommended process is to adjust the furnace cycle time, the components heated to brazing temperature, and then insulation 30-120S. Excessive temperature at this temperature will cause harmful diffusion, dissolution or other undesirable solder flux reactions.