Junction temperature is where two mechanical components connect or join—in welded joints, soldered joints, or bolted assemblies. Because junction temperature can dictate the thermal and mechanical response of a joint, we summarize some fundamental features of junction temperature.

Key Features:

• Definition Point: It is unique to the contact interface of two joined metals or components.
• Importance: we can determine the relative strength of a joint, if it conducts heat well or not, or if there's any chance of the material degrading in a high heat environment.
• Application: we use junction temperature in electronics, welding, or any thermal system that can fail or deteriorate rapidly when heat is excessive.

Monitoring junction temperature is the best way to keep structures intact and functioning well under a heat-intense environment, like electronics, power systems, and metal fabrication. If one can control junction temperature, this will reduce the chances of warping, cracking, or eventual fatigue of the junction.