Abstract:
The invention relates to a method for joining an aluminium rib to a steel tube, comprising the steps of (a) providing a first component in the form of a steel tube having an inner surface and an outer surface, and wherein at least the outer surface has a surface coating in the form of a braze-promoting layer comprising one or more metals selected from the group comprising nickel, cobalt, and palladium; (b) providing a second component forming a fin in the form of an aluminium brazing sheet, the aluminium brazing sheet comprising of an aluminium alloy core upon which on at least one side filler alloy is clad, and wherein the filler alloy has a composition comprising, in wt.%: Si 5-15%, Mg 0.03-1%, one or more elements selected from the group consisting of: (Bi 0.02-0.5, Pb 0.03-0.4, and Sb 0.03-0.4, and the sum of these elements being 0.5% or less), the balance aluminium; (c) bringing the first component and the second component into contact to form an assembly of components and whereby the braze-promoting layer is facing the filler alloy clad layer of the brazing sheet; (d) heating and subsequently holding the assembly of components in an inert gas atmosphere and without applying flux at a brazing temperature in the range between 550°C and 615°C to form a permanent bond occurring on at least one contact point of these components; and (e)cooling the brazed assembly of components.
Abstract:
The invention relates to a method for manufacturing finned tubes made of metal, in particular heat exchanger tubes, wherein at least one continuous strip (4) forming the fins (1) is fed tangentially to a tubular body (2) that is set into rotational motion, said strip wound onto the tubular body, the side of the strip (4) facing the tubular body (2) is connected to the tube surface by way of a welding device (7,8) using a filler material (9), and the strip (4) to be wound is fed just behind the welding area between guide discs (12) that extend toward the surface of the tube and to the point of welding up to the point of being flush therewith. In order to increase the life of the guide discs (12), the guide discs (12) are cooled using cooling water to which about 10 vol.-% of a welding release agent is added.
Abstract:
Beschrieben und dargestellt ist ein Verfahren zur Herstellung eines Rippenrohres, bei welchem ein Rohrgrundkörper (12) auf seiner Außenseite (16), insbesondere wendelförmig, mit einem Band (13) berippt wird, wozu das Band (13) an dem Rohrgrundkörper (12) unter Einsatz eines Laserstrahls (21) befestigt wird, wobei ein Rohrgrundkörper (12), insbesondere aus Kupfer oder Aluminium, sowie eines Bandes (13) aus Kupfer oder Aluminium, bereitgestellt wird, ein Faserlaser (25) zur Erzeugung des Laserstrahls (21) eingesetzt wird, ein von dem Faserlaser (25) erzeugter Laserstrahl (21) in den Kontaktbereich von Rohrgrundkörper (12) und aus Kupfer oder Aluminium bestehendem Band (13) einstrahlt, derart, dass zum Verschweißen sowohl dem Kontaktbereich zugeordnetes Rohrgrundkörpermaterial als auch dem Kontaktbereich zugeordnetes Bandmaterial von dem Laserstrahl (21) bestrahlt und aufgeschmolzen wird.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung eines Rippenrohrs, bei dem ein Rohr (2) aus Edelstahl durch wendelförmiges Bewickeln mit einem Band (3) aus Kupfer berippt wird und ein solches Rippenrohr. Bei der Fügung wird das Kupferband (3) unangeschmolzen hochkant in einen durch einen Laserstrahl ausschließlich an der Rohroberfläche (6) erzeugten Schmelzbereich (10) gesetzt und durch Erstarrung des aufgeschmolzenen Rohrmaterials am Rohr (2) festgelegt. Auf diese Weise wird ein Rippenrohr geschaffen mit einem inneren Rohr (2) aus korrosionsbeständigem Edelstahl und mit einer wendelförmigen Rippe (3') aus Kupfer zur Vergrößerung der Wärmetauschfläche des Rohrs (2), welche sich durch eine hohe Wärmeleitfähigkeit auszeichnet.
Abstract:
Two steel U-shaped half-section pipes (4, 5) are joined by a steel ribbed web (2) with rectangular folds. Soldering foil (23) is placed between the ridge regions (21, 22) of the ribbed web (2) and the outer surfaces (3) of the half section pipes (4, 5). Chamber-like jointing devices (11, 12) press the half section pipes, soldering foil (23) and ribbed web (2) together. Electrically operated heating units (16, 17) are accommodated inside, and can move in relation to, the jointing devices (11, 12). The ribbed web (2) and the outer surfaces (3) of the half-section pipes (4, 5) are bonded together as the solder liquefies, re-solidifies and hardens. The half-section pipes (4, 5) can be joined to the ribbed web (2) at the same time or one after the other. In the latter case, the entire assembly (1) must be rotated by 180°. After the soldering, cool air can be directed onto the soldered areas. Once two half-section pipes (4, 5) have been joined to form a heat exchanger pipe, the front faces are coated with zinc or aluminium or capped.
Abstract:
Tube à ailettes (1), son procédé de fabrication, et dispositif de mise en oeuvre dudit procédé. Selon le procédé présenté, au moins une bande sans fin (4) constituant les ailettes étant roulées de façon approximativement hélicoïdale autour d'un corps tubulaire (2) en rotation et le bord étroit de la bande (4) faisant face au corps tubulaire (2) est fixée à la surface dudit corps tubulaire au moyen d'un dispositif de soudage (7). Afin de permettre un travail économique, sans grande dépense d'énergie, et de pouvoir fabriquer un produit dont les ailettes sont fixées à la surface du corps tubulaire par l'intermédiaire de toute la largeur de leur base de façon optimale et dont la zone de soudure présente une bonne conduction de la chaleur, l'extrémité de travail du dispositif de soudage (7) est guidée dans l'angle libre compris entre la surface du corps tubulaire (3) et la bande à enrouler (4). Ainsi, un cordon de soudure (11) est appliqué par le dispositif de soudage (7) sur la surface du corps tubulaire, par adjonction d'un métal d'apport, avant l'application du bord étroit de la bande (4), ledit cordon de soudure suivant exactement la région de soudure de la bande (4) et de la surface du corps tubulaire (3). Le bord étroit de la bande (4) est ensuite pressé dans le cordon de soudure (11) encore liquide.
Abstract:
An auger useable for creating an opening in the ground for a soil sensor housing wherein the sensor housing has a predetermined volume and a tapered outer surface, includes an auger made in accordance with the methods described and defined in this specification. The auger having a shaft having an outer surface of circular cross-section having an larger outer diameter at one end than the other end and a strip material having a helical shape with an inner wall having a larger inner diameter at one end than the other end of the helical shape wherein the helically shaped material is fixed over the outer diameter of the shaft to form a tapered auger with helical flighting. The volume of the opening created by an auger in the ground will provide a matching volume for a sensor housing of a predetermined volume such that substantially the full length of the tapered outer surface of the sensor is adjacent the ground along the full length/depth of the created opening.
Abstract:
A nozzle as a welded structure includes a nozzle body (5), and a buckling prevention fin (6) joined to the nozzle body (5) by laser welding, in which an end of the buckling prevention fin (6) before laser welding is disposed to face the nozzle body (5), an installed state of the nozzle body (5) and the buckling prevention fin (6) includes an installed state in which a gap (G) is formed between the nozzle body (5) and the buckling prevention fin (6), and the buckling prevention fin (6) has a beveled portion (51) which is beveled at the end facing the nozzle body (5).