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according acetone alloys aluminium annealing apparatus applied autogenous welding avoid bevel blowholes brass brazing bronze carbide to water carbon cast iron cent CHAPTER cleaning flux cock combustion compressed constructed containing cooling copper cubic feet cubic foot cutting blowpipe cylinder delivery diameter dissolved acetylene edges example EXECUTION OF WELDS expansion and contraction fusion gases gasometer give hard steels heating flame high temperature hydraulic valve hydrogen iron and steel joining joint less line of welding liquid litres low pressure acetylene machine manufacture melting melting-point methods mild steel molten metal necessary nozzle obtained operation oxide oxide of iron oxidising oxy-acetylene welding oxy-hydrogen oxygen cylinder phosphorus pieces piping plates possible practice precautions preheating produced purifier red heat reducing valve regulation repair rivets square inch sufficient thickness tion tubes varies water vapour welder welding installations welding metal welding rod white jet zinc