Abstract:
A finned tube assembly for an air cooled condenser and method for forming the same. The finned tube assembly comprises a flow conduit in the form of a bare steel tube and at least one set of fins bonded directly to the tube. In one embodiment, the tube has a non-circular cross section and the fins have a serpentine configuration. An oil based carrier and flux mixture is used in one embodiment to braze the fins onto the bare tubes, A braze filler metal may he introduced proximate to the bonding site by several different delivery mechanism. The braze filler metal may be aluminum or aluminum silicon. The finned tubes assemblies are combined in tube bundles and assembled to form an air cooled condenser which may be used in power generation, station, and other applications.
Abstract:
Superalloy components (40, 50) are joined by mating a recess (44) formed in one component (40) with a corresponding projection (52) formed in another component (50) along a contact surface. The components are compressed along the contact surface and resistance heat brazed to each other. Current is passed between the components (40, 50) at a selected flow rate and application time until brazing alloy (60) melting occurs along the contact surface, and they are mutually affixed to each other. When repairing a damaged surface portion of a superalloy material component (40), the damaged portion is removed to form an excavated recess (44). A repair splice (50) is formed, preferably of a same material with similar mechanical structural properties, having a mating projection (52) with profile conforming to the corresponding recess (44) profile. The splice (52) and substrate (40, 50) are resistance heat brazed under compression pressure until brazing alloy (60) melting occurs along the contact surface, so that they are mutually affixed.
Abstract:
Bei einem Verfahren zur Herstellung eines Zellenradesaus Metallwird ein Werkzeug (40, 50, 60) mit einer zylindrischen Innenmantelfläche (41, 51, 61), deren Durchmesser dem Innendurchmesser der nachfolgenden Hülse (18, 20, 14) entspricht, zum Fixieren der Lamellen (16) in ihrer Winkellage auf die freien Endkanten der Lamellen (16) aufgesetzt. Eine Formstoffmischung (F) aus einem feuerfesten Formgrundstoff und einem aushärtbaren und durch thermische Behandlung vom Formgrundstoff lösbaren Bindemittel wird in die von der Innenmantelfläche (41, 51, 61) des Werkzeugs (40, 50, 60) und den Lamellen (16) begrenzten Zellen (22, 24, 26) eingebracht und ausgehärtet. Nach dem Entfernen des Werkzeugs (40, 50, 60) wird die nachfolgende Hülse (18, 20, 14) auf die freien Endkanten der durch die ausgehärtete Formstoffmischung (F) in ihrer Lage fixierten Lamellen (16) aufgesetzt. Die freien Endkanten der Lamellen (16) werden mit der nachfolgenden Hülse (18, 20, 14) durch Schweissen oder Löten zu den Zellen (22, 24, 26) gefügt. Die ausgehärtete Formstoffmischung (F) wird thermisch behandelt und der Formgrundstoff aus den Zellen (22, 24, 26) entfernt. Das Verfahren ermöglicht die Herstellung von Zellenrädern mit Materialwandstärken von 0,5mm und weniger für den Einsatz in Druckwellenladern.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von Rippenrohren aus Metall, insbesondere von Wärmetauscherrohren, wobei einem in Rotation versetzten Rohrkörper (2) mindestens ein die Rippen (1) bildendes, endloses Band (4) tangential zugeführt und auf diesem aufgewickelt, die dem Rohrkörper (2) zugewandte Seite des Bandes (4) mittels einer Schweißeinrichtung (7,8) unter Verwendung eines Zusatzwerkstoffes (9) mit der Rohroberfläche verbunden und das aufzuwickelnde Band (4) kurz hinter dem Schweißbereich zwischen Führungsscheiben (12) geführt wird, die bis dicht an die Rohroberfläche und die Schweißstelle heranreichen. Um die Standzeit der Führungsscheiben (12) zu erhöhen werden die Führungsscheiben (12) gekühlt, und zwar mit Kühlwasser, dem etwa 10 Vol-% eines Schweißtrennmittels zugeführt werden.
Abstract in simplified Chinese:提供了一种水墙屏焊接设备(10)。该设备包括入口组装(12),焊接组装(14),出口组装(16)和加热系统(18)、(20)。入口组装(12)用于接收复数个管(22)。焊接组装(14)用于从入口组装(12)并且用于允许该等管(22)被焊接在一起以形成水墙屏(24)。出口组装(16)用于从焊接组装(14)接收水墙屏(24)。加热系统(18)、(20)加热该等管(22)并经由磁感应操作。
Abstract:
A double tube for welded structure comprises an inside tube of a heat resistant ferritic steel and an outside tube of a heat resistant austenitic steel. The inside tube has a chemical composition which comprises specific amounts of C, Si, Mn P, S, Ni + Cu, Cr, Mo + W, V, Nb, Ti, B, Al, N and O with the balance of Fe and impurities. The outside tube has a chemical composition which comprises specific amounts of C, Si, Mn, P, S, Ni, Cr, Al, N and O with the balance of Fe and impurities. A fillet weld zone, which satisfies Formula of [wall thickness of outside tube ‰¥ fusion depth in fillet weld + 0.3 mm], is formed on the outside surface of the double tube, and the wall thicknesses (mm) of the outside tube and inside tube satisfy Formula of [wall thickness of outside tube / (wall thickness of outside tube + wall thickness of inside tube) ‰¤ 0.4]. The double tube is excellent in weld crack resistance. If this double tube is used, a welded structure forming various types of high-temperature equipment can be manufactured by fillet-welding plates, metal fittings, and the like to the outside surface of the tube by means of ordinary submerged arc welding without performing treatment such as preheating, postheating, and cleaning of steel. The inside tube may contain one or more kinds of elements selected from Ca, Mg and REM, and the outside tube may contain one or more kinds of elements selected from Mo, W, Cu, Co, Nb, Ti, V, B, Ca, Mg and REM.
Abstract:
The invention relates to a method for producing a cellular wheel made of metal, wherein a tool (40, 50, 60) having a cylindrical inner shell (41, 51, 61), the diameter of which corresponds to the inner diameter of the subsequent sleeve (18, 20, 14), is placed on the free end edges of the fins (16) for fixing the angular orientation of the fins (16). A molding material mixture (F) made of a fireproof base molding material and a curable binding agent that can be released from the base molding material by thermal treatment is applied in the cells (22, 24, 26) bounded by the inner shell (41, 51, 61) of the tool (40, 50, 60) and the fins (22, 24, 26) and cured. After removing the tool (40, 50, 60), the subsequent sleeve (18, 20, 14) is placed on the free end edges of the fins (16) fixed in place by the cured molding material mixture (F). The free end edges of the fins (16) are joined to the subsequent sleeve (18, 20, 14) by welding or brazing to the cells (22, 24, 26). The cured molding material mixture (F) is thermally treated and the base molding material is removed from the cells (22, 24, 26). The method makes it possible to produce cellular wheels having material wall thicknesses of 0.5 mm and less for use in pressure-wave superchargers.