The source of heat for brazing can vary depending on the specific application and requirements. Some common heat sources used for brazing include:
1. Oxyacetylene Torch: This is a popular heat source for brazing due to its high temperature flame. It uses a mixture of oxygen and acetylene gases to produce a hot flame that can reach temperatures of up to 3,500°C.
2. Furnace: Furnaces are commonly used for brazing larger parts or when a controlled heating environment is required. The temperature in the furnace is gradually increased to the brazing temperature, typically between 500°C and 1200°C, to ensure proper heat distribution and minimize thermal stresses.
3. Induction Heating: Induction heating uses electromagnetic induction to generate heat in the workpiece. It is a fast and efficient method, especially for brazing small parts or when precise heating is needed.
4. Electric Resistance: Electric resistance heating involves passing an electric current through a resistance element to generate heat. It is commonly used for brazing small parts or when localized heating is required.
5. Soldering Gun: Soldering guns are handheld tools that use electrical energy to heat a soldering tip. They are often used for small-scale brazing applications or when portability is important.
It is important to select the most suitable heat source based on factors such as joint design, ease of application, and production speed. The temperature during brazing is typically higher than 840°F (450°C) to ensure the filler metal melts and forms a solid and permanent bond with the base metals.
After the brazing process is complete, the parts are slowly cooled to minimize thermal stress and distortion. Post-brazing treatments such as heat treatment, machining, or surface finishing may also be performed to achieve the desired properties and appearance.
Overall, the choice of heat source for brazing depends on the specific requirements of the application, the size of the parts being brazed, and the desired quality of the joint.
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