How to quickly find Weld

How to quickly find Weld

 

 In the circuit board welding process due to improper operation or welding personnel non-professional welders often happen Weld circuit board, then what is Weld it? In fact, it is very simple to explain, the most common saying is that poor contact. How to find out in the shortest time what is the location of poor contact? And listen to Beijing Chuangyuan for your careful to come.

 

       Poor contact can be divided into two categories, one is the contact element (such as potentiometer) contact oxidation or wear caused; the other is Weld, including the solder is not welded, or solder joints for high-power components, Through the larger current, solder aging leads to cracking of solder joint failure. Most of the bad contacts fall into the latter category. In the actual maintenance summed up a simple and quick method to discover Welds, introduced to you for reference. The company is located in:

 

       It is possible that there is a circle of fine black cracks around the feet of the fusible element. Cracks are more and more obvious with the frequent occurrence of faults. The heavy elements can be loosened and the light ones seem to be very stiff. However, in fact, Crack, it shows over-melting of the solder joint phenomenon, do not deal sooner or later will be out of order. My approach is that no matter what the fault of all the black solder joints, especially high-power devices are carefully examined again around and found cracked solder joints on the weld, this step is familiar with the characteristics of the solder crack Ten minutes is enough, often can get a multiplier effect.