(a) manual metal arc welding; (b) shielded metal arc welding; (c) self-shielded flux-cored welding; (d) flux cored arc welding; (e) metal active gas and metal inert gas welding; (f) tungsten inert gas welding; (g) plasma arc cutting.
(a) submerged arc welding; (b) limited-duty arc welding; (c) resistance welding; (d) stud welding.