Gas welding uses tanks of compressed oxygen and fuel—most commonly acetylene—feeding these gases through hoses to a handheld torch, producing an extremely hot and easy-to-control flame.

Of the many metal repair methods, old and scaly smaller parts respond well to oxy-acetylene welding (OAW). See All 32 Photos Electric types of welding require clean, chemically sound base metals.

The work before us treats of welding as done by the oxy-hydrogen and oxy-acetylene blowpipe, the introductory matter on soldering and electric welding being outside the main purpose of the work.