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Water Reactive – The ability of a chemical to react with water to release a gas that is either flammable or presents a health hazard. Working Pressure – See “Maximum Operating Pressure.” Weld Metal - The filler wire and base metal that was melted while welding was taking place. This forms the welding bead. Weld Root - When looking at the weld profile or cross section, it is the deepest point or points the weld fused into the joint root. Welder - A person who performs manual or semiautomatic welding. Sometimes incorrectly used to describe a welding machine. Weaving - When wider beads are required the electrode is moved from side to side in a weaving motion. The greatest efficiency results from a weave of not more than 2½ times the diameter of the electrode. Welding Operator - A person who operates a machine or automatic welding equipment. Workpiece Connection - A means to fasten the work lead (work cable) to the work (metal to be welded on). Also, the point at which this connection is made. One type of work connection is made with an adjustable clamp. Workpiece Lead - The conductor cable or electrical conductor between the arc welding machine and the work.
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