Mechanically formed water supply tee fittings shall be constructed by

Soldering involves melting a filler metal at a lower temperature than brazing, typically below 450°C (842°F). While soldering can create effective joints, it is generally used for smaller or less critical applications in plumbing and does not provide the same strength and durability as brazing for water supply fittings.

Flaring refers to the process of shaping the end of a pipe to create a cone shape for a secure connection with a fitting. While useful in specific applications, flaring does not involve the joining of multiple pieces of metal and is not a method used for constructing tee fittings in water supply systems.

Chemically bonding involves the use of adhesives or chemical reactions to join materials. While this method can create strong bonds, it is not a conventional or reliable method for constructing water supply fittings, which require mechanical strength and resistance to high pressures.