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acetylene adjustment allow alloys aluminum amount apparatus asbestos avoid beginner bending bevel bottom brazing bronze welding butt weld carbide cast iron welding cause clamp clean considerable containers cooling copper crack cutting torch defects deoxidized ductility edges equipment excess filler material filler rod flux fused fusion gas chamber gases gauge heat hole hose important joint keep kerf manganese manganese bronze melting point method molten metal necessary needle valves neutral flame oxide oxy-acetylene flame oxy-acetylene welding parent metal penetration piece plate pool possible pounds per square practically preheating preparation pressure procedure produced proper puddle red heat regulator reinforcement repair result seam secure sheet metal side slag spelter square inch strength stresses sure surface tack welds tanks temperature tensile tensile strength thickness tion torch tip type of weld valve weld Figure weld metal welder welding operation welding rod white cone