Smith Oxy-Fuel Cutting, Heating, and Welding Torch: Difference between revisions

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* '''Always have a partner, use the buddy system - KEEP A 30 MINUTE FIRE WATCH AFTER END OF TORCH USE.'''
* '''Always have a partner, use the buddy system - KEEP A 30 MINUTE FIRE WATCH AFTER END OF TORCH USE.'''

=== [ Watch this safety Video] ===
'''[ Watch this safety Video]'''

Make sure gauges return to zero when tank valves are closed, the pressure adjustment valve is backed out and torch knobs are opened
Make sure gauges return to zero when tank valves are closed, the pressure adjustment valve is backed out and torch knobs are opened

Revision as of 10:12, 15 September 2021

Hive13 Equipment
List of All Documented Equipment
Smith MA509 2021-09-12.png
Owner/Loaner: Hive13
Hive13 Asset Tag: None
Make/Model: Smith MC509 WH100 (google)
Arrival Date: June 2021
Does it work?: Yes
Certification Needed?: Yes
Contact: Welding Warden
Floorplan: Welding Shop

About this Item

This rig includes a Smiths MC509 Oxy-Acetylene Cutting Torch with a Smith WH100 handle. It uses MC Series cutting tips. It is a medium duty cutting attachment which cuts up to 6" (153mm) steel. Hive13 has it set up with for oxygen & acetylene. Manual

Tip Options

This torch handle and cutting attachment are compatible with a variety of tips for different fuels and operations.

Smith Oxy-Fuel Torch Fuel, Tip, and Regulator Chart.png


BE WARNED - Acetylene becomes Dangerously EXPLOSIVE at or above 15 PSI

  • Almost anything burns in a pure oxygen atmosphere. This includes you.
  • Read the Manual - Heed all warnings - Darwinian penalties are inflicted on the careless.
    • Wear personal protective equipment. Wear welding gloves, helmet, leather apron, welding chaps, leather shoes, welding goggles, and other personal protective equipment to help prevent weld burns and injury. NO SYNTHETIC fiber clothing. Welding goggles or face shield with at least a No. 5 filter lens. an Autodark Welding helmet set to Grind mode shades 5 thru 8 provide full face protection.
    • Fasten cylinders securely. Do not handle cylinders roughly. Chain cylinders in an upright position to a wall or cart. When regulators are not on cylinders, keep safety caps in place. Caps will prevent damage to cylinder valves. An oxygen cylinder with over 2,000 psi in it becomes a lethal projectile if it falls over and its cylinder valve is sheared.
    • Never use oil on welding equipment. Oxygen + Heat + Oil = Fire When an oxygen cylinder valve is opened, the heat of recompresing the gas in the regulator is enough heat to combust. NO OIL.
    • Open cylinder valves correctly. Open the valve on the acetylene cylinder no more than three-fourths of a turn so it can be closed quickly in case of emergency. Open the valve on the oxygen tank fully, it is a double seated valve.
    • Keep the tip pointed away from your body. Do not saturate your clothing with oxygen or acetylene. Before and while lighting the flame, keep the tip pointed away from your body.
      • Light the flame with an approved lighter. Using matches to light the torch brings fingers too close to the tip.
      • Set the operating pressure carefully. Never use acetylene at a pressure over 15 psi.

Follow the manufacturer's recommendations for the correct operating pressures for the metal being welded and for the tip size being used.

    • Do not smoke or allow anyone else to smoke near the oxy-fuel gas welder. If fuel gas were to leak from the unit, smoking could provide ignition and cause a fire or an explosion.
    • Treat the flame with respect.
      • Keep the flame and heat away from the cylinder, hoses, and people.
      • Never lay down a lighted torch. Be sure the flame is out before laying down the torch.
      • Never walk around with a lighted torch.
    • Do not leave the work area until the cylinder valves are closed. Be sure the cylinder valves are closed and pressure is relieved from the hoses before you leave the work area.
    • Never stand in front of a regulator while you are opening a tank valve.
    • Do not weld or cut on containers that have held flammable materials.
    • Remove regulators and replace protective caps before transporting cylinders.
    • Store oxygen cylinders away from acetylene cylinders. A non-combustible wall at least 5 feet high should be used to separate cylinders.
    • Handle hot metal with pliers or tongs. Do not leave hot metal on the welding table because unsuspecting persons may touch it and be burned.
    • Check connections for leaking gases. To prevent fires or explosions, use soapy water to check connections for leaks.
  • Housekeeping: flame circle, no combustibles in cutting area, HAZMAT cabinet, clean up junk or debris
  • Have an A, B, C rated fire extinguisher present
  • Always have a partner, use the buddy system - KEEP A 30 MINUTE FIRE WATCH AFTER END OF TORCH USE.

Watch this safety Video

Make sure gauges return to zero when tank valves are closed, the pressure adjustment valve is backed out and torch knobs are opened acetylene = Red - Left hand threads for acetylene / notch on fittings oxygen = Green - Right hand threads for oxygen / no notch on fittings Use color coded flashback arrestors and check valves NEVER Use thread tape or pipe “dope” Never repair hose damage with tape or other materials - Cracked or nicked hose must not be used Use two wrenches in a “backup” wrench mode for snug fittings Check for leaks with soapy water

Welding and Cutting can produce Dangerous Fumes


Lighting the Torch

First – before you attempt to light the torch follow these checks:

  • Secure the oxygen and acetylene tanks in the torch cart.
  • Make sure regulator pressure adjustment screws are backed out!
  • Make sure torch valves are closed!
  • Stand away from front of regulator
  • Slowly open the oxygen cylinder valve for the first ½ turn. Then open all the way.
  • Open the acetylene cylinder valve no more than one turn.
  • Adjust regulator pressure adjustment screws to tip pressure settings
    • Acetylene 5 to 7 psi.
    • Oxygen 10 psi
  • Open/close torch valves separately and fine tune pressure settings on regulators
  • Depress cutting lever and adjust pressure if necessary

Lighting and adjusting the torch (with a positive/equal pressure mixer):

Neutral Flame
  • Separately purge both oxygen and fuel gas lines
  • Open fuel gas valve 1/2 turn
  • Ignite flame with striker
  • Increase fuel gas flow until flame leaves end of tip and no smoke is present
  • Decrease until flame goes back to tip
  • Open oxygen valve and adjust to neutral flame
  • Depress oxygen lever and make necessary adjustments

Shutting down the torch (with a positive/equal pressure mixer):

  • Close fuel gas torch valve
  • Close oxygen torch valve

If the torch/regulators and gases are done being used for a while, follow these procedures:

  • Close oxygen and fuel gas cylinder valves
  • Separately purge oxygen and fuel gas lines
  • Make sure all regulator gauges read 0
  • Back out regulator pressure adjustment screws!

Report any damage, etc. to the area warden. Remember to always follow basic safety rules when working with oxy-fuel equipment.