Abstract: A welded seam between overlapped edges of sheet material wherein the sheet material is heated to a temperature below the melting temperature and is forced together under high pressures to form a forged weld. The thickness of the sheet material in the weld area is reduced from double thickness to a thickness approaching a single thickness, with the weld interface being diagonally disposed. The weld is effected by grain growth across the interface such that the particular line along which the meeting surfaces of the metal are welded together is unobservable upon etching a cross section thereof and with magnification on the order of 100X. The heating is effected by applying to opposing edge portions which are to be overlapped and welded a high frequency current which effectively reduces heating to edge portions only of the metal with the heat effected area being in the vicinity of 0.1 inch.

Abstract: A coating apparatus and method for coating the exterior of articles passing spray nozzles which are sequentially operated to prevent coating material from passing between adjacent articles. Each nozzle is adapted to apply a limited width of coating which extends the entire axial extent of an article with the combined nozzles coating the entire periphery thereof. Each spray nozzle is operated to either apply a partial coating, a complete coating or several coatings to each article. The apparatus also includes timing screw and a turret conveyor which are rapidly stopped by means responsive to article jamming, and means are provided for facilitating the removal of jammed articles from a housing of the timing screw.

Abstract: This invention relates to a coating apparatus for coating the exterior of articles passing spray nozzles which are sequentially operated to prevent coating material from passing between adjacent articles. Each spray nozzle is operated to either apply a partial coating, a complete coating or several coatings to each article. The apparatus also includes timing screw and a turret conveyor which are rapidly stopped by means responsive to article jamming, and means are provided for facilitating the removal of jammed articles from a housing of the timing screw.