Method and apparatus for producing a post-mixed, stabilized scar

Details Method and apparatus for producing a post-mixed, stabilized scar Method and apparatus for producing a post-mixed, stabilized scar

1977-09-26

1978-09-19

Stallard, W.

Metal treatment

Compositions

Heat treating

266 51, B23K 704, B23K 708

Patent

active

041151542

ABSTRACT:
A process for thermochemically scarfing a metal workpiece comprising:
Preheating a spot on the surface of the workpiece where the scarfing reaction is to begin by directing a post-mixed preheating flame at the spot. The preheating flame is formed by:
(a) discharging at least one stream of preheat oxidizing gas and at least one stream of preheat fuel gas from separate ports in such a manner that the streams impinge external to their discharge ports, above the work surface and in such manner that the axes of the streams form an acute included angle between them, and
(b) stabilizing said preheating flame by discharging a low-intensity stream of oxidizing gas. The stabilizing stream is directed in the same general direction as the direction of the flame and proximate to the impingement of the preheat oxidizing gas and preheat fuel gas streams.
Steps (a) and (b) are continued until the spot reaches its oxidizing gas ignition temperature. Thereafter a stream of scarfing oxidizing gas is directed at an acute angle to the work surface at the preheated spot, while simultaneously relative movement is caused between the scarfing oxidizing gas stream and the work surface, thereby producing a scarfing cut.
Apparatus suitable for rapidly preheating with a stabilized flame is also disclosed.

REFERENCES:
patent: 2267405 (1941-12-01), Jones et al.
patent: 2356197 (1944-08-01), Jones et al.
patent: 2365942 (1944-12-01), Crowe
patent: 3231431 (1966-01-01), Allmang
patent: 3752460 (1973-08-01), Lytle
patent: 3966503 (1976-06-01), Engel

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