What characterizes a Cold Solder Connection?

A cold solder connection is characterized by a grayish porous appearance. This type of connection occurs when the solder does not melt properly or is insufficiently heated during the soldering process, often resulting in a joint that appears dull, rough, or grainy rather than smooth and shiny. The poor heating can prevent the solder from properly wetting the surfaces it is meant to join.

This grayish, porous look indicates a lack of proper bonding between the solder and the components, which compromises the mechanical and electrical integrity of the connection. In contrast, other appearances or qualities, such as a shiny surface or a high level of conductivity, typically indicate a solder joint that has been made correctly, ensuring a strong and reliable connection.