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Wave preheating Details
Date:2016-08-31

In the wave soldering process, the flux can preheat the solvent to evaporate, thus reducing gas is generated during welding. Preheat a system is very important to understand the principles and norms of their operations, to enhance the welding quality, very meaningful. Rosin flux and an active agent starts to decompose and activated, you can remove the PCB pad oxide film component ends and pin surfaces and other pollutants, and protect the metal surface effect of preventing re-oxidation occurs.
When conditions can be measured in real-time temperature curve, the warm-up time by a conveyor speed control. Such as low or preheat temperature and preheat time is too short, the flux of solvent evaporation is not sufficient to produce a gas causing pores, weld defects such as solder ball welding; such as high or preheat temperature warm-up time is too long, the flux is ahead of decomposition, so that the loss of flux activity, it will also cause glitches, bridges and other welding defects. Therefore, to properly control the temperature and preheat time, preheat temperature is in the best wave front is coated with a sticky underside of the PCB flux.
Welding process is a complex process of interaction between the weld metal surface, the molten solder and air, it must control the soldering temperature and time, such as low temperature welding. Liquid solder viscosity, is not well in the metal surface wetting and diffusion, prone icicles and bridging, solder defects such as surface roughness; such as welding temperature is too high, easy to damage components, also produces solder oxidation speed, spot black hair, not full pads and other issues.
According to the size of the printed circuit board, the thickness of the printed circuit board mounted components to determine the size and number of wave soldering temperature, the peak temperature is usually 250 ± 5 ℃. Since heat is a function of temperature and time at a certain temperature heating element and heat pads increases with time, the wave soldering time by adjusting the conveyor speed to control the speed of the conveyor belt according to the different types of wave soldering machines length, to adjust the width of the peak to peak time contacting each solder joint to a welding time, welding time is generally 3-4s.


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Tel:0755-27559288 Mobile:13923795982 Fax:0755-27447250 E-mail:1965235820@qq.com
Add:1st Floor, 106 Tanjong Avenue, Shenzhen Industrial Park, Pingshan District, Shenzhen
Wave soldering tin furnace jig fixture test fixture wave soldering tin furnace jig fixture test fixtureShenzhen City Xinhualong Technology