Metallic Arc Cutting - Metal arc cutting is an arc cutting process wherein the severing of metals is effected by melting with the heat of an arc established between a covered metal electrode and the metal to be cut. Standard arc welding AC or DC machines can be employed for cutting the metals. Special coated mild steel electrodes are used for cutting purposes.
The diameter of the electrode depends upon the metal thickness to be cut. A current, as high as the electrode can take without getting overheated to the point of cracking the covering, is recommended. For a 4 mm electrode 250-350 Amps current may be used.
For cutting, place the plate in the flat position, strike the arc and start the cut at the bottom edge of the plate, i.e., the edge in the lowest position. To cut thin stock, move the electrode in a straight line whereas use a weaving motion to cut stock heavier than the electrode.
