Transcript Oxy Fuel Cutting Systems Basic Setup & Use

Oxy Fuel Cutting Systems
Basic Setup & Use
Typical Torch System
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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 700 F
• Forged from a single piece of steel no welding
• Minimum of 1/4” thickness
• Stored away from combustibles
Oxygen cylinder sizes:
T
K
LK
S
D,E,Y,
U,LE
Q
ME
MBE XAD
MD
R
Acetylene Cylinders
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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:
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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
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
Protector Cap
• Protects valve from being knocked off
• Must be in place when Regulators are off
Backflash Arrestor
• Torch / Manifold
• Regulator / torch
Hoses
• Acetylene = Red
– Notch around nut means LH thread
• Oxygen = Green
– RH Thread
• New Hoses have talc inside - Blow out
before connecting to torch
Needle valves
Preheat / Cutting hole pressures
Torch Body
• Torch body is the part of the torch that is
held, it contains two needle valves to
control flow of gas
• single stage / dual stage
Cutting Head
Welding head contains mixer, mixing throat,
and the welding tip
Cutting Tips
• 1 or 2 piece
Rosebud
FOR
HEATING
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 OxyAcetylene Systems
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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 OxyAcetylene 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 OxyAcetylene Systems
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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
Resume
Cutting
Heat
thethe
starting
point
Move
oxygen
hole off the edge
of the plate and start the oxygen
stream
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.
• Preheating: Heating prior to a welding or
cutting operation
•Flashback: when the torch flame moves into
or beyond the mixing chamber.
•Tack Weld: A short weld used to hold
workpieces together
Safety
• Watch where you cut
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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.
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