Chemical igniter for an exothermic cutting lance

Details Chemical igniter for an exothermic cutting lance Chemical igniter for an exothermic cutting lance

1995-08-22

1996-12-03

Kastler, Scott

Metallurgical apparatus

Means for cutting solid metal with heat, e.g., blowpipes

266225, B23K 700

Patent

active

055805159

ABSTRACT:
An igniter for an exothermic lance has an inner peripheral wall about the lance, the inner peripheral wall defining dual purpose teeth for centering the lance relative to the igniter and holding various lances of differing diameters. The teeth space the inner wall from the lance so as to form a flue between the inner wall and the lance. Outside the inner peripheral wall and concentric therewith is an outer peripheral wall thicker than the inner wall. A flammable substance is between the inner and outer walls, the flammable substance being more rapidly combustible than the inner wall and outer walls. A match head element at the fore end of the igniter is the mechanism to initiate combustion of the flammable substance, which can be a Thermit mixture. A gap between the match head element and the lance allows oxygen from the lance to enter the flue and accelerate lance ignition.

REFERENCES:
patent: 4050680 (1977-09-01), Sweeny
patent: 4915618 (1990-04-01), Brandin

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