作者: Jeffrey K. Fergason , John D. Fergason
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摘要: A welding helmet having high structual integrity is formed of a single sheet composite material, such as Kevlar fabric impregnated with phenolic thermoset resin; viewing port in the front includes lens either fixed or automatically darkening type; and curves, bends, folds steps material trim pieces area about peripheral rim shell provide additional stiffening for helmet. method making pre-forming to shape similar that finished molding shape, placing pre-shaped compression mold closing while curing by applying heat other otherwise assisting material; mounting