The Esab Group Inc.

Stephen A Engel

Michael S Showalter

David L Pierce

Raymond C Smith

A lower pre-heat block assembly ( ) for use with a metal scarfing apparatus ( ) is disclosed. The lower pre-heat block assembly has a lower block ( ) and an extension ( ) engaged upon and in overlying relationship with a front face ( ) of the lower block. A gas discharge outlet ( ) is defined within the front face of the block. The extension may partially overlie the gas discharge outlet such that a gas discharge orifice ( ) is defined in the front face of the block by the extension. The extension includes an upper face ( ) which extends forwardly from the front face of the block, and is recessed with respect to an upper face ( ) of the block. So constructed, when a sheet-like oxidizing gas flow ( ) is passed over the upper faces of the block and the extension, respectively, and as a fuel gas ( ) is emitted through the gas discharge outlet, the fuel gas is pneumatically compressed between the oxidizing gas flow and the upper face of the extension such that the fuel gas is substantially uniformly distributed along the longitudinal length of the lower pre-heat block assembly and forms a uniform sheet-like fuel gas flow ( ) which underlies and adjoins the sheet-like oxidizing gas flow so as to prevent ambient air from aspirating into the oxidizing gas flow and thereby result in a smooth and uniformly scarfed surface on the metal workpiece.

Lower pre-heat block for use in metal scarfing apparatus

A lower pre-heat block assembly (,) for use with a metal scarfing apparatus (,) is disclosed. The lower pre-heat block assembly has a lower block (,) and an extension (,) engaged upon and in overlying relationship with a front face (,) of the lower block. A gas discharge outlet (,) is defined within the front face of the block. The extension may partially overlie the gas discharge outlet such that a gas discharge orifice (,) is defined in the front face of the block by the extension. The extension includes an upper face (,) which extends forwardly from the front face of the block, and is recessed with respect to an upper face (,) of the block. So constructed, when a sheet-like oxidizing gas flow (,) is passed over the upper faces of the block and the extension, respectively, and as a fuel gas (,) is emitted through the gas discharge outlet, the fuel gas is pneumatically compressed between the oxidizing gas flow and the upper face of the extension such that the fuel gas is substantially uniformly distributed along the longitudinal length of the lower pre-heat block assembly and forms a uniform sheet-like fuel gas flow (,) which underlies and adjoins the sheet-like oxidizing gas flow so as to prevent ambient air from aspirating into the oxidizing gas flow and thereby result in a smooth and uniformly scarfed surface on the metal workpiece.

A lower block assembly for a thermochemical scarfing apparatus which comprises a base member and an extension releasably joined to the base member. The extension includes a continuous slot across its longitudinal length for delivering a stream of fuel gas onto the metal workpiece during the scarfing operation, and the base member and extension include a gas delivery system for delivering fuel gas to the slot at a substantially uniform rate along the entire longitudinal length of the slot and so as to achieve a uniform scarfing operation and a smooth scarfed surface across the width of the workpiece.

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Florence, SC, United States of America

Stephen A Engel