| 摘要 |
In welding metal sheets together from only one side, an improved welding backup tape is self-adhesively applied to insure the consistent formation of a smooth, inclusion free, slightly convex underbead which requires little or no dressing, or grinding, and which does not impede in any way the achievement of 100% radiographic weldment testing. This welding backup tape is made in one embodiment by mixing into solution two parts of a colloidal silica solution with one part of a titanium dioxide refractory coating solution. Applying this resulting solution as a refractory coating to the upper portion of an electrical grade, heat treated, braided, natural finish, finely woven, fiberglass material in a sleeving configuration. Heating this solution soaked fiberglass sleeving at or above seven-hundred and below one-thousand degrees fahrenheit to activate its binding capability, to burn off all the organic matter from both the fiberglass sleeving and the refractory coating, and to remove all mechanical and chemical water. Bringing together from supply sources, this refractory coated fiberglass sleeve, a silicone adhesive coated electrical grade fiberglass carrier tape, and a transfer material such as a thin, three to six mil, polyethylene film. Pressing the fiberglass sleeving, coated side up, down upon the center of the fiberglass carrier tape, adhesive side up. Pressing the transfer material, e.g. the polyethylene film, down on both the coated fiberglass sleeving and the fiberglass carrier tape to affix itself to the exposed adhesive of the carrier tape at either side of the affixed coated sleeving.
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