# US 5,350,462 A · Process for cutting large blocks of metal

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- Number: US 5,350,462 A
- Document ID: US5350462A
- Status: Granted
- Kind: A
- Application number: 08/092,130
- Filed: 1993-07-22
- Granted: 1994-09-27
- Earliest claimed: 1993-07-22
- Assignees: Southwind Enterprises Inc.
- Inventors: Joseph J. Riccardi
- Web page: https://patentgrep.com/patent/US5350462A

## CPC

- B23K 7/105: {specially adapted for particular geometric forms}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

A process for cutting very large solidified pools of metal and metallic structures by flame cutting by means of an improved burning bar is described. The cutting is conducted by a hot flame composed of very hot high pressure oxygen exiting from a burning bar packed with intermingled mild steel and aluminum rods. The hot flame or blast of oxygen melts and mobilizes the molten metal by creating at molten stream or jettisoned molten droplets and oxidized particles.

## Claims

### Claim 1

A process for cutting large blocks of ferrous and non-ferrous metals or refractory structures which melt above 1000.degree. C. comprising the steps of:
i) introducing into a mild steel pipe having internal diameter in excess of 1.5 inches and having two opposing threaded ends, mild steel rods and aluminum rods, said rods being coextensive with said mild steel pipe and intermingled with one another, said intermingled mild steel rods and aluminum rods having diameters less than 1/4 inch, and the ratio of the diameter of said mild steel rods to the diameter of said aluminum rods ranging between 1:2 and 2:1, said aluminum rods comprising up to 40 wt % of said rods within said pipe, and packing said rods such that an oxygen containing gas introduced at a pressure of at least 150 psi at one end of said pipe is capable of substantially unrestricted passage;
ii) connecting said mild steel pipe to a handle adapted to receive one end of said mild steel pipe, said handle having valve means adapted to introducing gas to said mild steel pipe at high pressure;
iii) igniting to burn said opposing end of said mild steel pipe and said rods therein, and introducing oxygen containing gas into said mild steel pipe at a pressure whereby said oxygen containing gas exits at not substantially reduced pressure at the opposing end of said mild steel pipe and at a mass flow rate which is at least capable of sustaining burning of said pipe and rods therein, thereby producing a blast of hot oxygen containing gas exiting from said mild steel pipe, said blast being capable of melting and mobilizing material from said large block, and
iv) impinging said blast of hot oxygen containing gas on the surface of a large block, thereby melting a groove into said surface of said large block and mobilizing the melted material out of said groove.

### Claim 2 (depends on 1)

A process as claimed in claim 1, wherein said material melted by said blast of hot oxygen containing gas is mobilized in the form of droplets.

### Claim 3 (depends on 2)

A process as claimed in claim 2, wherein said droplets are additionally oxidized into solid oxide particles by said blast of hot oxygen containing gas.

### Claim 4 (depends on 3)

A process as claimed in claim 3, wherein a portion of said oxide particles are removed by an exhaust device.

### Claim 5 (depends on 1)

A process as claimed in claim 1, wherein said solid block of metal comprises one or more members of the group consisting of: copper, nickel, iron, cobalt molybdenum, manganese, chromium, titanium and precious metals.

### Claim 6 (depends on 1)

A process as claimed in claim 1, wherein said oxygen containing gas is pure oxygen.

### Claim 7 (depends on 1)

A process as claimed in claim 1, wherein a plurality of blasts of hot oxygen containing gas exiting from a plurality of burning mild steel pipes each containing therein intermingled steel rods and aluminum rods, said plurality of blasts impinging simultaneously on the surface of said large block.

### Claim 8 (depends on 1)

A process as claimed in claim 1, wherein said mild steel pipe packed with intermingled mild steel rods and aluminum rods therein, is extended by connecting one threaded end of said mild steel pipe to one end of a second similar mild steel pipe, said second mild steel pipe having two opposing threaded ends and having packed therein similar intermingled mild steel rods and aluminum rods, said rods being co-extensive with said second mild steel pipe.