Abstract: A fillet welding apparatus for fillet welding on heads of valves for internal combustion engines, such apparatus including a valve blank stock storage station, a welding torch for fillet welding on valve heads of each valve blank, and feed apparatus for engaging and feeding valve blanks from the stock storage station to the welding torch and from the fillet welding torch to a product valve storage station, the feed apparatus including means for counting and feeding selected of the counted valves to a testing station.

Abstract: A coated valve face of an engine valve is formed of an Fe-based alloy having a composition consisting essentially of, by weight, 0.7 to 1.5% of C, 10 to 15% of Mn, 24 to 30% of Cr, 6.1 to 9.8% of Mo, 10 to 15% of Ni, 0.1 to 0.4% of N, 0.2 to 1.5% of Si, and optionally at least one of 0.1 to 5% of Nb, 0.1 to 5% of Ta and 0.15% of W as required (the total content of Nb, Ta and W being limited to 5% or less), and the balance substantially Fe and inevitable impurities, and having a two-phase structure formed of an austenitic phase and an eutectic carbide phase. In another embodiment, the composition contains between 0.05 to 1% Co. The Fe-based alloys are preferably applied to the valve face by plasma beam or laser beam coating of powdered such alloys onto the valve face.

Abstract: In a Cu-alloy mold for use in centrifugal casting of Ti or Ti-alloys, the mold body is made of a Cu alloy satisfying the following relationship:Ts+0.3.rho..gtoreq.70where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS). A cavity disposed in the mold body has a volume which is at most 30% of the volume of the mold body. Also disclosed is a method for centrifugally casting Ti or Ti-alloy by the use of the above-described mold.

Abstract: Herein disclosed are a high-strength Ti alloy material having improved workability which contains 2-5% Al, 5-12% V and 0.5-8% Mo (the percents being on a weight basis) and which satisfies the relation: 14%.ltoreq.1.5.times.(V content)+(Mo content).ltoreq.21%, with the balance being Ti and incidental impurities, and a process for producing such high -strength Ti alloy material.The process comprises: preparing a Ti alloy ingot having the above specified composition; hot working the ingot at a temperature wihtin the range of 600.degree.-950.degree. C.; subjecting the work to solid solution treatment at a temperature in the range of 700.degree.-800.degree. C.; and age-hardening the work at a temperatrue between 300.degree. and 600.degree. C. The reesulting Ti alloy material is suitable for use in the fabrication of parts of aircraft where high specific strength and heat resistance are required.

Abstract: A process for producing an ingot from molten metal scrap, particularly scrap consisting of refractory metals such as titanium, zirconium and alloys thereof, comprises changing ungraded metal scrap into a tubular member with a closed end which is made of the same material as that of the metal scrap; melting the scrap-charged tubular member by heating which an electron beam or plasma electron beam, with said member being held substantially horizontally in a vacuum melting furnace. Alternatively, a pair of consumable electrodes which are made of such scrap-charged tubular members are melted with an arc produced between the tips of the tubular members which serve as electrodes. Since the metal scrap need not be graded according to size, the range of scrap charges that can be melted for ingot making is expanded. If the tubular member is replaced by a box with an open top, the scrap can be packed easily and uniformly.