OXY-FUEL GAS WELDING
Jan 05, 2016
OXY-FUEL GAS WELDING
TERMS AND DEFINITIONSCONTINUED
Back Fire Momentary burning back of the flame into the
tip. Flame goes out with a loud snap or pop.
Flash Back Fire inside the torch.
Inner Cone Inner white part of a neutral flame.
STEPS FOR OXY-FUEL WELDING
Support oxygen and acetylene cylinders in an upright position so they cannot be tipped over
Make sure pressure-adjusting screws are loose before opening the cylinder valve
Stand to the side of tank and regulator
STEPS CONTINUED
Open cylinder valve SLOWLY. Note: The oxygen cylinder valve is opened to full
capacity. The Acetylene valve is opened ¾ of a turn only.
Set Acetylene to 5-7 psi Note: Acetylene becomes unstable at pressures
above 15 psi and becomes highly explosive.
Set Oxygen to 10-20 psi Light Acetylene before opening oxygen
torch valve. Use only a striker, never a match or lighter.
ADJUSTING THE FLAME
Adjust the flame to a neutral flame. This is the desired flame for most welding applications.
There are 3 types of flames. Neutral Flame
Perfect flame Oxidizing Flame
Too much Oxygen Carburizing Flame
Too much Acetylene
SAFETY
Never use oil or grease on regulators, torches, or fittings.
Do not use oxygen as a substitute for compressed air
Use safety goggles, gloves, and protective clothing.
Have CO2 or dry chemical type fire extinguishers available.
Test connections for leaks with a non-oil-based soapsuds, paint brush, and water.
Avoid lighting the torch or welding near combustible materials.
SAFETY RULES CONTINUED
Never open the acetylene cylinder valve more than ¾ of a turn.
Always operate torch in a well ventilated place.
Never weld on containers that have been used for combustible materials.
Avoid breathing toxic fumes when welding. Place steel caps on all gas cylinders when
they are being moved or stored, to protect the valves.
Shut off cylinder valves when not in use for any length of time to reduce the possibility of leakage and strain on equipment.
PPE (PERSONAL PROTECTIVE EQUIPMENT)
Eye & Ear Protection
Welding Goggles with Proper Lens Shade Number
Welding Gloves & Optional Covering
Proper Attire for OFW, OFC, OFB, & AFS
GogglesGogglesEar PlugsEar Plugs
Hearing ProtectionHearing Protection
Safety GlassesSafety Glasses
EYE & EAR PROTECTION
HEADGEAR
Cover LensCover Lens
Spare Cover LensSpare Cover Lens
Filter LensFilter Lens
Adjustable Head GearAdjustable Head Gear
LENS SHADES SELECTION FOR OXYGEN FUEL GAS APPLICATIONSMaterial Minimum Recommended*
Size Protective Shade Operation Inches Shade Number Number
Oxygen Fuel Gas Welding )(OFW) < 1/8 4 4-51/8 to 1/2 5 5-6
> 1/2 6 6-8
Oxygen Fuel Gas Brazing 3 3-5
Air Fuel Gas Soldering 2 2-4
Oxygen Fuel Gas Cutting (OFC) < 1 3 3-41 to 6 4 4-5
> 6 5 5-6
* As a rule of thumb, start with a shade that is too dark to see the weld or cutting zone. Then go to a lighter shade, which gives sufficient view of the weld or cutting zone without going below the minimum.
AWS/ANSI LENS SHADE NUMBERS
Leather Welding TrousersLeather Welding TrousersLeather Welding Leather Welding Cape Sleeves/BibCape Sleeves/Bib
Leather Welding JacketLeather Welding Jacket
Leather Welding GlovesLeather Welding Gloves
Leather Welding ApronLeather Welding Apron
OPTIONAL COVERING
Cap with Visor Cap with Visor Turned to the Back Turned to the Back
Long Sleeve Shirt Long Sleeve Shirt
Pants without CuffsPants without Cuffs
Gauntlet Leather Gauntlet Leather Welding GlovesWelding Gloves
Industrial Quality Industrial Quality Safety GlassesSafety Glasses
PROPER ATTIRE
High Top High Top Leather BootsLeather Boots(Steel Toes)(Steel Toes)
OXY-FUEL SAFETY VIDEO
You will take half a page of notes
You will turn them in
https://www.youtube.com/watch?v=pVv8a_FVIOU