copper pipe welding summary
The refrigeration system of refrigeration air conditioning, generally with copper aluminum and other non-ferrous metal materials, in the process of manufacturing, installation and maintenance, pipeline welding is a key link, it not only affects the appearance, more important is to affect the system can work normally light problem, must cause great attention.
copper pipe welding process Selection of solder
The pipe fittings of refrigeration and air conditioning are mostly copper (purple) pipes. The commonly used solder types are copper phosphorus solder, silver copper solder, copper zinc solder and so on. In welding, according to the characteristics of pipeline materials, correct selection of solder and skilled operation, to ensure the quality of welding.
2.1 Welding of similar materials
2.1.1 Brazing copper to copper
Phosphor copper solder or phosphor copper solder with low silver content, such as 2% or 5% silver base solder can be used. This solder is relatively inexpensive, has a good solution, uses caulking and wetting processes, and does not require flux.
2.1.2 Welding of copper and steel
Brass bar solder with appropriate flux is optional. When welding. After HEATING THE SOLDER TO a certain temperature, insert it into the flux, so that the flux is melted and attached to the solder, but after welding, the residual flux near the weld must be cleaned with hot water or steam to prevent corrosion. In the use of flux with alcohol diluted into a paste, coated on the surface of the welding, welding alcohol evaporates quickly and form a smooth film is not easy to lose, but also to avoid the risk of water immersion refrigeration system.
2.2.2 Welding of copper and iron
Phosphorous copper solder or brass bar solder may be selected, but the appropriate flux, such as borax, boric acid, or a mixture of boric acid, should also be used.
The welding operation：copper pipe welding process
The welding of different materials, different pipe diameter when the size of the welding gun and flame temperature is different, welding flame size can be controlled by two needle valve adjustment, flame adjustment according to oxygen, acetylene gas volume ratio can be divided into carbonization flame, neutral flame and three kinds of oxide flame.