Abstract:
Individual plate members (W1, W2, W3, W4, W5) that are different in plate thickness or material are joined together by mush seam welding to form a hollow material (W, W'), and the rigidity is controlled in individual parts. By spinning the rigidity material (W, W'), a junction (1b) and a cone (1c) are formed in an optimum shape, and a hollow member (1) is manufactured. Thus, the hollow member (1) smooth in juntion and high in welding strength is obtained in spite of thin plate material. When this hollow member (1) is used in a catalyst container, the sealing performance is excellent without being accompanied by an increase in radiant noise or an increase in weight.
Abstract:
The invention relates to a method for producing a rocket drive and to a rocket drive which has a combustion chamber (1) and an expansion nozzle (2) which adjoins the combustion chamber (1). At least two single-piece segment bodies (4a, 4b, 4c) are provided, each segment body (4a, 4b, 4c) forming partial contours of the combustion chamber (1) and the expansion nozzle (2). Said segment bodies are brought together in order to form the combustion chamber (1) and the expansion nozzle (2).
Abstract:
A method of manufacturing a ball valve having a valve housing (10) and a ball (20), comprising the steps of weld-connecting a pair of housing halves (12) and (14) in mirror symmetrical shape through a single weld line so as to surround the ball having a through hole and a pair of recessed parts provided therein beforehand with the through hole (22) directed so as to be aligned with the weld line, forming holes (42) and (50) having the centers on the operating center line of the ball valve for mounting a pair of pivot shaft portions by machining in the valve housing at the positions aligned with both opening ends of the through hole, rotating the ball by an angle of 90 DEG to align the through hole of the ball with the openings (12A, 14A) of the valve housing and also align the recessed parts (26, 28) of the ball with the holes of the housing, and installing the pair of pivot shaft portions (60, 68) into two holes, inserting pivot shafts into two recessed parts, and weld-connecting the periphery of the pair of pivot shaft portions to the edge portions of the holes.
Abstract:
A connecting portion (10c) of a container (10) of a catalyst converter is formed with a joining portion (15) to be joined to a joining portion (16) of a flange member (11) by spinning working, and the joining portion (15) formed by the spinning working is joined to the joining portion (16) of the flange member (11) by friction welding. One of the connecting portion (10c) of the container of the catalyst converter and the flange member (11) is extended so as to be disposed radially inward of the joining portions (15) and (16).
Abstract:
The invention relates to a method for producing a rocket drive and to a rocket drive which has a combustion chamber (1) and an expansion nozzle (2) which adjoins the combustion chamber (1). At least two single-piece segment bodies (4a, 4b, 4c) are provided, each segment body (4a, 4b, 4c) forming partial contours of the combustion chamber (1) and the expansion nozzle (2). Said segment bodies are brought together in order to form the combustion chamber (1) and the expansion nozzle (2).
Abstract:
A method and apparatus for welding a shaft having an open seam defined between opposed longitudinal edges, comprising passing the shaft along its longitudinal axis through an array of pressure rollers which contact the surface of the shaft at a plurality of discrete points and compressing the shaft by applying inwardly directed radial forces to the shaft. An electrical resistance welding assembly welds the seam while closed by said pressure rollers.
Abstract:
An improved wheel rim and method for producing the same using a rim blank which has been formed into a hoop and joined together by a friction stir welding process is disclosed. The method for producing the wheel rim of the present invention includes the steps of: (a) providing a flat blank of material having a pair of opposed ends; (b) providing a chamfer in the opposed ends of the flat blank; (c) positioning the opposed ends of the blank adjacent one another to form a generally cylindrical hoop; (d) providing a pair of flats on the hoop in the region where the opposed ends meet; (e) joining the flattened opposed ends of the hoop together using a friction stir welding process; and (f) subjecting the hoop to one or more metal forming processes in order to produce a desire wheel rim.