Final answer:
The most common scenario for brazing dissimilar metals in the HVAC-R field is brass fittings to copper.
Step-by-step explanation:
In the HVAC-R field, the most common scenario for brazing dissimilar metals is brass fittings to copper. Brazing is a process that combines two or more metal components by heating them and then melting a filler metal to join them together. Brass fittings and copper are commonly used together in HVAC-R systems, such as air conditioning and refrigeration units.
Learn more about brazing dissimilar metals