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.
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
If the pipe is metal try a metal detector. If plastic, get out your shovel.
The base metal is iron - the active metal is zinc (galvanized)
Burrs.
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.
metal
Corrugate Metal Pipe Culvert.