What are the five necessary conditions for soldering?
First, the automatic soldering machine welding parts must have excellent weldability
The so-called solderability refers to the function of forming an excellent separated alloy between the metal material to be soldered and the solder at a proper temperature. Not all metals have good weldability, and some metals such as chromium, molybdenum, tungsten, etc. have very poor weldability; some metals have better weldability, such as copper and brass. During welding, the low temperature causes an oxide film on the metal surface, which affects the weldability of metal materials. In order to further improve solderability, the surface can be tinned, silver plated and other measures to avoid oxidation of the surface of the data.
Second, the surface of the automatic soldering machine must adhere to clean
In order to achieve excellent separation of solder and weldment, the soldering surface must be kept clean. Even if the weldment is excellent in weldability, due to storage or being oxidized, an oxide film and oil stain which are harmful to wetting can be generated on the surface of the weldment. Be sure to clean the stained film before welding, otherwise the welding quality cannot be guaranteed. The mildly oxidized layer on the metal surface can be cleaned by the flux. The severely oxidized metal surface should be cleaned by mechanical or chemical methods, such as stopping scraping or pickling.
Third, the automatic soldering machine should use the appropriate flux
The role of the flux is to clean up the oxide film on the surface of the weldment. Different soldering processes should choose different fluxes, such as nickel-chromium alloy, stainless steel, aluminum and other metal materials. Without the flux, soldering cannot be performed. When soldering fine electronic products such as circuit boards with automatic soldering machines, in order to ensure reliable soldering, a flux based on rosin is generally used.
Fourth, the automatic soldering machine welding parts should be heated to the appropriate temperature
During welding, the role of thermal energy is to condense the solder and heat the welding object, so that the tin and lead atoms get enough energy to penetrate into the crystal lattice on the surface of the metal to be welded to form an alloy. If the soldering temperature is too low, it is beneficial to the penetration of solder atoms, it is impossible to form alloys, and it is easy to form a false solder. If the soldering temperature is too high, the solder will be in a non-eutectic form, slowing down the flux synthesis and volatilization rate, and causing the solder quality to fall, which is severe It may also cause the pads on the printed circuit board to fall. http://hfkjbxg.icu/
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