Final answer:
Thermal bonding is the sub-principle that involves aligning two parts together and locally heating the interface to form the joint. Thermal bonding is a process in which heat is used to join two materials together by melting or softening the base material and causing it to fuse with another material.
Step-by-step explanation:
The sub-principle that involves aligning two parts together and locally heating the interface to form the joint is Thermal bonding. Thermal bonding is a process in which heat is used to join two materials together by melting or softening the base material and causing it to fuse with another material. This can be done through techniques such as welding or soldering.
Thermal bonding is the sub-principle that involves aligning two parts together and locally heating the interface to form the joint. Thermal bonding is a process in which heat is used to join two materials together by melting or softening the base material and causing it to fuse with another material. This can be done through techniques such as welding or soldering.