Generally (but not always) pronouns stand for (pro + noun) or refer to a noun, an individual or individuals or thing or things (the pronoun's antecedent) whose identity is made clear earlier in the text. For instance, we are bewildered by writers who claim something like. They say that eating beef is bad for you.
A wire feeder may be used for machine or automatic welding and must be the constant speed type. The wire feeder must have a speed adjustment covering the range of from 10 in. per minute (254 mm per minute) to 125 in. per minute (3.18 m per minute) feed speed. PAW or plasma arc welding using an automated process.
FCAW FCAW stands for Flux Cored Arc Welding. The flux of the welding wire is in the center of the electrode instead of on the outside. The process requires wire feed spools and cable. The rod is pushed through the center of the cable and through the welding gun. Shielding gas may or may not be used depending on the flux material in the core of the wire. FCAW has the advantage over SMAW for all position welding and the speed of welding since the wire is continuously fed.