| 摘要 |
<p>A device for cutting through resistant materials such as steel plates of upto around 5 mm thickness comprises a container for a thermite charge, the container having a linear slot in the form generally of the cut which it is desired to make, a closure for the slot which is rupturable by the action of the thermite burning and a means of igniting the thermite charge such as an electrical igniter/primer combination. The rupturable closure may be aluminium foil or a combustible material such as cardboard. By igniting the thermite charge at one end of the slot the charge burns progressively along the container and drives out a stream of hot particles through the aperture to progressively cut the resistant material along the desired line. A method of cutting may use the device or the like or, less preferably, a point source of thermite reaction products may be moved instead so as to direct and concentrate the hot products along a line across the surface which is to be cut.</p> |
