9 Parts: Cylinders Hoses - Brass or braided Check valves or hand valves Flashback Arrestors - OSHARegulatorsMain valves
10 RegulatorsEach regulator has two gauges mounted on a single manifold, one indicates cylinder pressure and the other indicates working pressure for the torch
11 Pressure Regulating Valves 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
12 Protector Cap Protects valve from being knocked off Must be in place when Regulators are off
19 Acetylene safety Precautions Never call acetylene “gas”Extremely explosive with air or oxygenLeave wrench on tank
20 Oxygen Safety Precautions Never call oxygen “Air”Never allow oxygen to come in contact with oil, grease, or other petroleum basesNever use oxygen for compressed airNever move cylinders without capsAlways secure cylinders
21 Setup Procedures for Oxy-Acetylene Systems Do not move cylinders without valve protectionSecure cylindersInspect threads“Crack” Oxygen ValveAttach regulators and tightenBlow talc from new hosesAttach Flashback arrestors, check valves, hoses, check valves, torch body, torch head, and tipProperly pressurize torch and check for leaks
22 Procedures for Lighting Oxy-Acetylene Systems SCREW ADJUSTING SCREW OUTStand to the side of the adjusting screwOpen tanks one at a time (Oxygen wide, Acetylene 1/2 turn)Adjust regulatorsBleed lines one at a timeFine adjustments made while bleeding the hosesOpen the acetylene needle valve and light torchOpen high pressure oxygen needle valve wideAdjust to a neutral flame
23 Shut Down Procedure for Oxy-Acetylene Systems Turn off acetylene needle valveTurn off preheat oxygen needle valveTurn off tanksBleed lines one at a timeTURN ADJUSTING SCREWS OUTTurn off all needle valves
24 Starting or restarting a cut Heat the starting pointResume CuttingMove the oxygen hole off the edge of the plate and start the oxygen stream
25 Offhand Cutting Techniques Rolling your hands“Pre-load” your wrist and forearmRoll, don’t slide for a smoother cutSliding the torch through your fingersApply pressure to torch tubes with thumb and index fingerKeep other three fingers in fistDon’t move the torch body hand during stops and starts.
26 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.
27 Terms and DefinitionsPenetration: Distance from the original surface of the base metal to that depth at which fusion stops.Base Metal: Metal to be weldedFusion Welding: process that joins metals by heating them to a melting point and allowing them to fuse or flow together.
28 Backfire: A short pop of the torch flame followed by extinguishing of the flame or continued burning of the gases.Preheating: Heating prior to a welding or cutting operationFlashback: when the torch flame moves into or beyond the mixing chamber.Tack Weld: A short weld used to hold workpieces together
29 Safety Watch where you cut Don’t blow molten metal toward another personDon’t melt the hosesDon’t drop metal on hosesDon’t let hoses lay on hot metalRelease adjusting screw on regulators before opening valves
30 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 turnDo not use or compress acetylene at pressure higher than 15 psi.Light acetylene first, shut it off firstNever use oil on regulators or any equipment
31 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 leaksNever use Leather Gloves to pick up metal; use pliersWear welding goggles or a face shield with a lens no. 4-6.Never wear synthetic clothing; wear cotton.