Final answer:
Soldering is the process in question, as it does not require the workpieces to be heated, unlike welding or brazing which involve higher temperatures.
Step-by-step explanation:
The process you're referring to, where there is no need to heat the workpieces, is most likely soldering. Unlike welding, which requires the base metals to be melted, and brazing, which involves heating the base metal, soldering includes joining components with a solder that has a lower melting point than the workpiece, and thus the workpieces themselves are not typically heated directly or substantially. This means that soldering can be done at much lower temperatures compared to welding or brazing.