Generally you would use an epoxy or a form of the brand Gorilla Glue. Normally it depends on the other material.
friction welding can be used to join dissimilar metal. Also depending on the metals most arc welding processes and oxy-fuel can used. It's just a matter of using the correct filler material or electrode.
melt the plastic to the metal
It depends on the material of the pipes
There are several methods for joining metal to metal using heat: Brazing and soldering are used to join two pieces of metal without melting them, by melting a different metal with a lower melting point, and letting it flow between the pieces as a joint. (Brazing is generally done at a higher temperature than soldering.) A person who does this could be called a solderer or a brazer, (but this is not a common term). Welding is used to join two pieces of metal by melting them at the join and sometimes an additional filler piece is added. A person who does this is called a welder.
Lead solder is a mixture (alloy) of lead and tin (in different proportions) that has a lower melting point than either of the components. It is used to join metal components together in electronics, lead and zinc came in stained glass windows etc. There are also silver and gols solders for jewelry.
Saw it apart, then glue another coupling on to re-join it later.
A good epoxy will join metal to metal. I use Ren-Weld and J B Weld with a lot of success. Autobody shops use an epoxy called Speedgrip -very expensive !
The word pronounced sauder is solder (a metal joining material, or to join with solder).
It is a verb, but then glue is also a noun. To glue, join or fasten is a verb. To glue, such as any of various substances that can be used as an adhesive, is a noun
Wood glue. Go to a hardware store.
glue
friction welding can be used to join dissimilar metal. Also depending on the metals most arc welding processes and oxy-fuel can used. It's just a matter of using the correct filler material or electrode.
All plastics are a group of hydrocarbon molecules . Acrylic cement is a glue that melts the surface of the plastic fusing it all together with the other plastic material
melt the plastic to the metal
To seal and join plexiglas in aircraft construction
Krazy glue
With a plastic joiner