That is an excellent question. People are
indeed able to weld things underwater. Usually
this involves ships or offshore machinery. The
welding is usually accomplished through shielded
metal arc welding (SMAW). Its a type of welding
that uses an electrode which is sheathed in flux.
The flux evaporates and creates a gas environment
around the weld which shields the weld from the
outside (wet) environment. The exact type of
electrode material used will depend on the metals
that you are trying to join, but generally they
might be some type of steel alloy.
I hope that helps.
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