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PCB printed circuit board conductors (copper conductors) should mainly be made of nickel or copper nickel without any contacts. The effective area of the conductor is mainly solid copper.
PCB printed circuit board PTH, especially the graphic transfer end printed circuit board, usually uses copper foil wire etching method. When two lines pass through copper foil on a conductor, the independent line body ends will permanently overlap together through the wire. The traditional copper foil etching machine has two support mechanisms, which retain the solder pads on all conductors with copper foil, resulting in solid contact between the two ends of the copper foil. Additionally, due to the current flowing through the conductive channel, the influence of stress can affect the normal operation of the circuit.

However, significant electromagnetic forces are generated between the two ends, which often cause local overheating between the edges of the solder pad (trace), leading to changes in solder curvature and the occurrence of virtual soldering.
In order to solve this problem, some people have studied the origin of copper. Due to overloading, the contact surface between the solder joint and copper may have high contact resistance or local cold welding on the copper surface, resulting in the formation of solder joints. Due to poor thermal stress, weak copper surface, and rapid reaction of tin melting, as well as the presence of tin and lead in the board and sometimes in the bridge board, solder joints are formed. The formation of tin lead makes the welding surface of the solder pad unaffected. At this point, tin is coated locally on the board surface around the buried hole (Cont Plug) that has not yet fallen off. The purpose of single sided solder is to fully fill the gaps between solder pads and components with solder resist between each pad, achieving coplanar soldering and integrated solder joints.
Xinchang Electronic Technology specializes in Wuhan SMT mounting, printed circuit board welding, printed circuit board mounting, etc., with quality assurance