Exothermic Electrodes Oxygen Requirements.

Exothermic cutting consumes a large volume of oxygen; therefore, a 3/8-inch inside diameter oxygen hose is required to maintain sufficient volume. The hose size is important because it is the oxygen volume together with heat that does the cutting while the pressure blows the slag away. A high volume, high flow regulator capable of delivering 70 CFM is necessary. A two-stage regulator is recommended. The cutting pressure must be 90 psi over bottom pressure

Exothermic Electrodes Material Consumption.

It is expected that actual lengths of cut will fall within the range of cut figures listed, as these figures were attained under actual field conditions. Allowances should be made for diver proficiency and underwater conditions such as visibility, metal cleanliness and current.

Advantages and Disadvantages of The Exothermic Electrode Cutting Process. Exothermic electrodes have the following advantages:

  • The cutting technique is very simple and readily mastered.
  • They will cut thin metal when the power is off.
  • Cutting is performed rapidly.
  • They will cut all ferrous and non-ferrous metals.
  • They are applicable to all metal thicknesses.
  • They will burn through concrete, rock, coral, marine growth and other non-conductive materials when the power is off.
  • The power required is within the capability of a 200-ampere welding power source.
  • A 12-volt battery can be used as an ignition source.
  • Unlike steel-tubular rods that stop burning the instant the electrical circuit is broken, the exothermic electrodes will continue to burn as long as oxygen is flowing through the electrode.

 

CAUTION

Unlike steel-tubular rods that stop burning the instant the electrical circuit is broken, the exothermic electrodes will continue to burn as long as oxygen is flowing through the electrode. Disadvantages of Exothermic Electrodes. The following are disadvantages of exothermic electrodes.

Larger volume of oxygen is required than with steel-tubular electrodes. Burning time of the electrode is short; 45 to 55 seconds. Contact with the work is not required to sustain ignition, thus electrode waste can occur.

 

Disadvantages of Exothermic Electrodes.

  • The following are disadvantages of exothermic electrodes.
  • Larger volume of oxygen is required than with steel-tubular electrodes.
  • Burning time of the electrode is short; 45 to 55 seconds.
  • Contact with the work is not required to sustain ignition, thus electrode waste
    can occur.