A-Solders-Electronic Components-Custom Design Circuit Board Pcb

- Feb 08, 2017-

Solders-Electronic components-Custom Design

Circuit Board Pcb

Electronic components (PCBs)

Soldering of an SMD capacitor

In wave soldering, parts are temporarily kept in place with small dabs of adhesive, then the assembly is passed over flowing solder in a bulk container. This solder is shaken into waves so the whole PCB is not submerged in solder, but rather touched by these waves. The end result is that solder stays on pins and pads, but not on the PCB itself.Currently, mass-production printed circuit boards (PCBs) are mostly wave soldered or reflow soldered, though hand soldering of production electronics is also still standard practice.

Reflow soldering is a process in which a solder paste (a mixture of prealloyed solder powder and a flux-vehicle that has a peanut butter-like consistency[6]) is used to stick the components to their attachment pads, after which the assembly is heated by an infrared lamp, a hot air pencil, or, more commonly, by passing it through a carefully controlled oven.

Since different components can be best assembled by different techniques, it is common to use two or more processes for a given PCB. For example, surface mounted parts may be reflow soldered first, with a wave soldering process for the through-hole mounted components coming next, and bulkier parts hand-soldered last.


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