Fill in the Blanks welding -fill in the gapsOnline version review Professional English in Use - Engineering unit 28 by Marzena Krzeptoń 1 stick consumable welding flux metal melts conductor weaken gas Shielded filler molten rod arc , generally called arc welding or welding , involves striking an electric arc between the workpiece and an electrode - an electrical . The heat from the arc the base metal . The electrode consists of a welding - a stick of metal of the same type as the workpiece - which provides . The welding rod is therefore - it is used up . The rod is also coated with a material called . When heated , this produces a shielding , which protects the metal from oxygen . Without this gas , the hot metal would combine with the oxygen in the air , and this would the weld .
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