| 摘要 |
408,719. Uniting by fusion. THOMPSON (WOLVERHAMPTON), Ltd., J., and JEAVONS, A., Ettingshall Engineering Works, Wolverhampton. Nov. 3, 1932, No. 30961. [Class 83 (iv).] An arc-welding electrode consists of a core a of mild steel or other metal on which is wrapped in continuous layers a strip of paper, such as thin brown paper b previously coated with a paste of sodium silicate to act as an adhesive, a flux and an agent for retarding combustion of the paper. Since the metal at first melts faster than the paper burns the arc is shielded at k so that a higher voltage and longer arc may be used, and oxygen and nitrogen of the air are excluded by the inert gas such as carbon monoxide produced by the burning. The paper is wrapped on the rod in several thicknesses. In forming an alloy weld, powdered metal may be incorporated in the silicate or otherwise placed on the layers of paper. Specifications 230,831 and 245,635, [both in Class 83 (iv)], are referred to.
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