What are the properties of galvanized iron pipes?why do we use?can we do welding on it?

Question

What are the properties of galvanized iron pipes?why do we use?can we do welding on it?

Answer 1

Galvanized metal has a zinc coating on it to protect it from rust. The zinc will corrode before the iron, and unlike rust, the zinc oxide will not fall off the pipe so forms a protective coating on the base metal. Unlike tin plating  when the zinc coating is scratched the base metal is still protected because the zinc will oxidize easier than the iron, where tin will actually accelerate the rusting of iron if o2 can get to it.

galvanized pipe can be welded or cut with a torch, however the fumes given off by the zinc should not be inhaled, they are poisonous, an will build up in the body over time and sensitize you to them.

forgot to add

welding will remove the coating

Answer 2

Galvanic method is the way to apply protective coating to the steel , they use hot dip method filled with zinc and pass electric current through the sink.

welding can be done but require a special welding procedures and welders qualifications, welding will damage the coating