Guangdong wave soldering manufacturers, Shenzhen wave factories, professional brand, manufacturing expertise, the Friends of the automated wave soldering manufacturers, high-quality small wave soldering, lead-free wave soldering energy-efficient, compact body double wave, functional, solder Big wave with the same effect. Wave soldering PCB preheat temperature is too high, so that the flux carbonation, loss of activity, resulting in poor wettability. Set the proper preheat temperature. A non-wetting, non-wetting and dewetting: after wave soldering metal surface substantially continuous film of solder, the non-wetting surface, the solder did not completely in contact with the matrix metal, but can see the exposed thread base metal surface. Dewetting: Wave after first vaccination solder wetting of the base metal surface with insufficient wetting retracted so that the base metal surface is leaving a very wave solder, while there are some isolated intermittent solder ball, large solder ball is in contact with the base metal has a large contact angle. Similar anti-wetting, non-wetting surface on the base metal will produce some sort of stain-wetting phenomenon when the solder pot in the back metal impurity concentration to a certain value, will produce half wet. Non-wetting and de-wetting causes: 1. Basic metal body unsolderable 2. Inadequate flux activity or deterioration failure. 3. Surface oil or grease substances make flux and solder contact with the surface can not be welded. 4. Wave soldering time or temperature abuse. Non-wetting and de-wetting solution: 1. Improve the welded metal weldability. 2. Switch to strong activity flux. 3. Reasonably adjust the temperature and time of flux. 4. The elimination of the welded metal surface contaminants. 5. Holding the solder pot of solder purity. Contour pads conformal (welding / dry) contour conformal solder joints causes: excessive solder for welding, solder joints in the accumulation of excessive convex surface shape is formed unseen component pins line profiles. Solder too little shriveled, a serious shortage of food seats, can not completely seal the wires are connected to partially exposed. When the PCB brazing wire circular section, if the contact angle of 45 ° tensile strength is large average tensile strength is lower than the maximum number. The contact angle optimum range 15 ° <⊙ <45 ° requires brazing to extend the lead wetting height H≥D 3