What does the term "tinning" refer to in soldering?

The term "tinning" in soldering specifically refers to the process of applying a thin layer of solder to a metal surface. This step is crucial as it helps promote better adhesion in subsequent soldering operations. By pre-tinning, you ensure that the surfaces to be joined are properly prepared, which enhances the quality and reliability of the final solder joint. It effectively coats the metal, which can include wires, pads, and leads, making them easier to solder and providing a good pathway for electrical conductivity.

Tinning can also mitigate oxidation on the surfaces to be soldered, which further enhances the overall solderability of the components involved. This foundational technique is commonly used in practices outlined by the J-STD-001 standard, which details the requirements and methods for soldered assemblies throughout various applications in electronics manufacturing.