High temperature welding backup strip
AssigneeMinnesota Mining and Manufacturing Company
InventorRoger H. Keith
Life of this patent
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Abstract
The tendency of molten weld metal to burn through a supported refractory welding backup material is greatly reduced by incorporating a woven carbon fiber cloth between the refractory and the support. A preferred product is a pressure-sensitive adhesive tape construction incorporating the carbon-fiber cloth in the backing; surprisingly, the carbon does not embrittle the weld.
Claims11
In a welding backup tape capable of being wound in roll form convolutely about a core, comprising a narrow, elongate flexible sheet backing having, joined to one face thereof, a layer of refractory material for spanning the joint between two abutted pieces to be welded and being held in position during the welding operation to support the weld material, the improvement which comprises utilizing as at least part of said backing a woven carbon fiber cloth, whereby said tape resists extremely high welding temperature without burning through said backing.
In the method of welding abutted metal workpieces which comprises spanning the joint between the workpieces with a layer of refractory material supported by a metal carrier, the improvement which comprises interposing a carbon fabric between the refractory material and the metal carrier, whereby the carbon fabric prevents contact between the molten weld material and the metal carrier.
Dependencies are inferred from the claim text.