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acetylene acetylene cylinders adequate ventilation aluminum arc cutting process arc welding brazing brazing filler carbon electrode confined spaces cutting cutting process electrode filler metal filler rod flame flux fluxes fuse plug gas cylinders grounded insulation mapp mapp gas molten molten metal oxides OxyFuel Welding oxygen cylinders precautions preheat respirators safety precautions severe shock torch welding Welding Aluminum welding equipment welding machine welding machines welding process welding rod Welding Safety Welding Symbols Welding technique