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Oxy Fuel Welding Basic Setup & Use. By: Jeremy Hodkiewicz. Typical Torch System . Oxygen Cylinder Acetylene Cylinder Method of Securing the cylinders Caps Regulators Backflash arrestors Hoses Torch Body Torch Head Torch Tip Clothing and Eye/Face Protection. Oxygen Cylinders.
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Oxy Fuel WeldingBasic Setup & Use By: Jeremy Hodkiewicz
Typical Torch System • Oxygen Cylinder • Acetylene Cylinder • Method of Securing the cylinders • Caps • Regulators • Backflash arrestors • Hoses • Torch Body • Torch Head • Torch Tip • Clothing and Eye/Face Protection
Oxygen Cylinders • Oxygen is very pure - 99% • Pressure is about 2200 psi • Forged from a single piece of steel - no welding minimum ¼” thick • Atmoshere • 21% oxygen • 78% Nitrogen • 1% other (carbon dioxide, argon, helium, water vapor)
Oxygen Cylinder Safety • Valve is a back-seating valve • Always open all the way!!! • Always transport with safety cap on • Tanks should always be safety chained • Should valve be broken off tank will become a torpedo that is capable of breaking through a concrete wall!!!
T K LK S D,E,Y,U,LE Q ME MBE XAD MD R Oxygen cylinder sizes:
Acetylene Cylinders • C2H2 - Made from calcium carbide and water • Cylinders are filled with monolithic filter material • 85% porous (Asbestos fibers, balsawood) • Cylinders are then filled with Acetylene gas and Acetone • The acetone absorbs the acetylene and slowly releases it as it is used • Let stand upright at least 20 minutes before using • Cylinder safety must be safety chained • Safety cap must be on when changing tanks. • Only open valve ¼ to ½ turns • More than 15 PSI Acetylene is very explosive
WS WCL WC WQ WK WTL
Regulators • Gauges – • Tank pressure • Working pressure • Regulator- adjusts the working pressure
Hoses • Acetylene= Red • Notch around nut means LH thread • Oxygen = Green • RH Thread • New Hoses have talc inside - Blow out before connecting to torch
Backflash Arrestor • Torch / Manifold • Regulator / torch
Torch Body • Valves control gas flow • Final flame adjustment controlled here
Setup Procedures • Hooking up new cylinder • Place new cylinder in rack and hook up safety chain • Remove safety cap • Crack valve open to clean dirt out of valve • Hook up regulator (use proper tools) • Now see adjustment procedure
Setup Procedures • Make sure regulator ADJUSTING SCREW IS TURNED OUT • Stand to the side of the adjusting screw • Open tanks one at a time (Oxygen wide, Acetylene 1/2 turn) • Turn acetylene valve on torch open one turn and turn regulator screw in until gauge reads (3-5psi) • Turn oxygen valve on torch open one and turn regulator screw in until gauge reads (10 psi)
Lighting Procedure • Open acetylene valve ½ turn • Light torch with sparker • (do not light with anything else!!!) • Adjust acetylene to proper flame • Slowly turn on oxygen until a neutral flame is obtained • Flame temp is about 5500°F • Steel melts at 2800°F
Welding Flame Types Carburizing Flame Neutral Flame Oxidizing Flame
Shut Down Procedure • Turn off acetylene torch valve • Turn off oxygen torch valve • Turn off tank valves • Bleed lines one at a time • TURN ADJUSTING SCREWS OUT
Oxy-Acetylene Welding • Hold blue cone about 1/16-1/8” from metal at a 15-45° angle • Move tip in small circles until a molten puddle is formed • Slowly push the puddle across the metal
Oxy-Acetylene Welding (With Filler Rod) • Heat metal until puddle is formed • Then hold filler rod about 3/8” from flame • Metal will melt off of filler rod and be drawn into puddle • Slowly push the puddle across the work piece
Weld Quality Torch High Torch Low Torch Slow Torch Fast OK
Safety • Backflash (will make a hissing noise) • Turn Oxygen off first • Watch where you point your flame (flame temp is 5500°F) • Don’t blow molten metal toward another person • Don’t melt the hoses • Don’t drop metal on hoses • Don’t let hoses lay on hot metal • Only light torch with sparker
