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added metal alternating current amperes applied autogenous soldering butt joints butt welding carbon arc welding carbon monoxide carbon rod cast iron circuit clamps clean surfaces coal gas combustion conductors connected continuous current core cylinders dissolved acetylene edges electric energy engine ferrous metals fused metal fusing point gas welding gases hammering hot metal hydrogen and carbon inches iron and steel lead burning length of arc limit the current load machine material melting metal arc metal electrode method mixture molten motor necessary number of welders operator outer oxy-acetylene oxy-hydrogen blowpipe oxygen positive electrode practice produce proportion protected reducing regulating resistance Repair repetition resistance in series rollers Seam Welding sheets single phase skill SMITH WELDING solid metal spot welding sufficient suitable Supply authorities supply pressure Swaging switched THERMIT WELDING thickness three-wire tool transformer tubes varies Vide voltage volts WATER GAS welded metal welding apparatus welding heat wire wrought iron