Piercing Holes in Steel Plate with steel-tubular electrodes.

Holes can be easily pierced in steel plate using steel-tubular
electrodes. The following technique is recommended:

  • Touch the plate lightly with the electrode at the desired point. Hold the oxygen trigger
    down and call for SWITCH ON.
  • Hold the electrode stationary for a moment, withdrawing it momentarily as necessary
    to start an arc and permit melting of the steel tube inside the covering.
  • Push the electrode slowly into the hole until the plate is pierced.

This technique has been used to pierce holes in 3-inch steel plate without difficulty. A hole slightly larger than the electrode will be produced. The hole can be enlarged by working
the electrode in and out in a sawing motion. A similar technique may be used with exothermic electrodes.