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 at 70 0 F Forged from a single piece of steel - no welding Minimum of 1/4” thickness Stored away from combustibles
K LK TSD,E,Y, U,LE QMEMBEXAD MD R Oxygen cylinder sizes:
Acetylene Cylinders Acetone - absorbs acetylene under pressure Temperature has an extreme affect on pressure Protected valve or cylinder cap Stored away from oxygen and combustibles
Oxygen Cylinder Valve Brass Construction Double back seat - NEVER LEAVE HALF OPEN Pop off valve - (fragile disk) Right hand Thread
Acetylene Cylinder Valve Brass Construction Packed valve - OPEN 1/2 TO 3/4 TURN Hand wheel or tank wrench - NEVER REMOVE WRENCH during use RH (Male) or LH (Female) Thread
Manifold Systems Increased Efficiency more stations no downtime
Parts: Cylinders Hoses - Brass or braided Check valves or hand valves Flashback Arrestors - OSHA Regulators Main valves
Regulators Each regulator has two gauges mounted on a single manifold, one indicates cylinder pressure and the other indicates working pressure for the torch
Each regulator has an adjusting screw so pressure to the torch can be quickly controlled by turning the screw righty-tighty increases pressure, left-loosey decreases pressure Pressure Regulating Valves
Protector Cap Protects valve from being knocked off Must be in place when Regulators are off
Acetylene safety Precautions Never call acetylene “gas” Extremely explosive with air or oxygen Leave wrench on tank
Oxygen Safety Precautions Never call oxygen “Air” Never allow oxygen to come in contact with oil, grease, or other petroleum bases Never use oxygen for compressed air Never move cylinders without caps Always secure cylinders
Setup Procedures for Oxy- Acetylene Systems Do not move cylinders without valve protection Secure cylinders Inspect threads “Crack” Oxygen Valve Attach regulators and tighten Blow talc from new hoses Attach Flashback arrestors, check valves, hoses, check valves, torch body, torch head, and tip Properly pressurize torch and check for leaks
Procedures for Lighting Oxy- Acetylene Systems SCREW ADJUSTING SCREW OUT Stand to the side of the adjusting screw Open tanks one at a time (Oxygen wide, Acetylene 1/2 turn) Adjust regulators Bleed lines one at a time Fine adjustments made while bleeding the hoses Open the acetylene needle valve and light torch Open high pressure oxygen needle valve wide Adjust to a neutral flame
Shut Down Procedure for Oxy- Acetylene Systems Turn off acetylene needle valve Turn off preheat oxygen needle valve Turn off tanks Bleed lines one at a time TURN ADJUSTING SCREWS OUT Turn off all needle valves
Starting or restarting a cut Heat the starting point Move the oxygen hole off the edge of the plate and start the oxygen stream Resume Cutting
Offhand Cutting Techniques Rolling your hands –“Pre-load” your wrist and forearm –Roll, don’t slide for a smoother cut Sliding the torch through your fingers –Apply pressure to torch tubes with thumb and index finger –Keep other three fingers in fist –Don’t move the torch body hand during stops and starts.
Beveling Angles Slide the torch through your fingers toward you. Only move the hand nearest the flame when continuing the cut. Keep your other three fingers in your fist. This will keep your hands cooler and allow you to make a better cut.
Terms and Definitions Penetration: Distance from the original surface of the base metal to that depth at which fusion stops. Base Metal: Metal to be welded Fusion Welding: process that joins metals by heating them to a melting point and allowing them to fuse or flow together.
Backfire: A short pop of the torch flame followed by extinguishing of the flame or continued burning of the gases. Flashback: when the torch flame moves into or beyond the mixing chamber. Tack Weld: A short weld used to hold workpieces together Preheating: Heating prior to a welding or cutting operation
Safety Watch where you cut –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 Release adjusting screw on regulators before opening valves
Stand on the opposite side of the regulator when opening a valve Open cylinder valve slowly, oxygen first all the way open and acetylene just a quarter of a turn Do not use or compress acetylene at pressure higher than 15 psi. Light acetylene first, shut it off first Never use oil on regulators or any equipment
Do not use oxygen as a substitute for compressed air Keep heat, flames and sparks away from combustibles. Keep hoses out of sparks or spatter to prevent leaks Never use Leather Gloves to pick up metal; use pliers Wear welding goggles or a face shield with a lens no. 4-6. Never wear synthetic clothing; wear cotton.