Brazing is a process used to join two metal pieces together The filler metal used for joining is heated above the melting point and poured over the base metals or pipes.
This is hard to answer with out knowing what type of metal. what the pipe is being used for, the amount of pressure that may be not the pipe.
The base metal is iron - the active metal is zinc (galvanized)
If it is a copper or metal pipe, tap the pipe gentle with a some thing metal (screw driver/small wrench ect...) If the pipe makes a echo sound it is empty, if the pipe has water in it, It will not echo. this also works with pro pain bottles and other metal objects
Corrugated Metal Pipe. CMP
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By the color
Non-metal
To connect a metal pipe to a PVC pipe using a metal to PVC adapter, the best way is to first ensure that both pipes are clean and free of any debris. Apply primer and cement to the PVC pipe and the adapter, then insert the PVC pipe into the adapter and hold it in place for a few seconds to allow the cement to set. Repeat the same process for the metal pipe and the other end of the adapter. Allow the connection to dry and cure according to the manufacturer's instructions before using the pipes.
If the pipe is metal try a metal detector. If plastic, get out your shovel.
Burrs.
Corrugate Metal Pipe Culvert.
Yes, you can join plastic pipe to metal pipe. However, the bigger question is "will my local building code allow me to do this?" and also is it safe to do it. To answer that question, please consult a local contractor or handyman in your area.