EP0660064B1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP0660064B1
EP0660064B1 EP94118838A EP94118838A EP0660064B1 EP 0660064 B1 EP0660064 B1 EP 0660064B1 EP 94118838 A EP94118838 A EP 94118838A EP 94118838 A EP94118838 A EP 94118838A EP 0660064 B1 EP0660064 B1 EP 0660064B1
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EP
European Patent Office
Prior art keywords
tube
plate
heat exchanger
tubes
welded seam
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EP94118838A
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German (de)
French (fr)
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EP0660064A3 (en
EP0660064A2 (en
Inventor
Herbert Dr. Damsohn
Albert Schmitz
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Definitions

  • the invention relates to a Heat exchanger according to the preamble of claim 1, and a method of manufacturing the heat exchanger.
  • a heat exchanger of the type mentioned is out FR-A 2 121 757, where one possibility is described is cylindrical tubes in tube sheets of heat exchangers weld that into the openings of the tube sheets or if the tubes are pushed through to one end of the tube sheets are, in extensions of the pipes, a rotating one Electrode acts on an arc weld carries out and the melted and usually additionally supplied Material then forms a weld that both in the inner wall of the tube as well as in the surface of the Tube sheet leaks. Have the tube sheets used there but a strength that is significantly more than ten times that Thickness of the tube wall is. Such arc welds would look at thinner tube sheets, especially if they were made from Aluminum, do not allow to be carried out.
  • DE 30 36 427 A1 describes a laser beam reflection system known with which it is possible to get one out to rotate an existing laser beam head mirror arrangement and therefore a circular weld with any diameter to manufacture.
  • DE 30 36 427 A1 describes a laser beam reflection system known with which it is possible to get one out to rotate an existing laser beam head mirror arrangement and therefore a circular weld with any diameter to manufacture.
  • the invention is therefore based on the object of a heat exchanger of the type mentioned at the beginning that the requirements for mechanical stability and tightness of the pipe-floor connection are met are, even if the dimensions of pipes and tube sheets are very small for weight reasons. Furthermore, a Methods of manufacturing the heat exchanger can be specified.
  • the openings in the tube sheet are initially designed so that the Pipe ends kept largely gap-free in the openings are that the pipe ends are then in their assigned openings be inserted so that they are flush with the one at the collecting room adjoining side of the tube sheet, and that then laser welding through one along the circumference of the Tube ends guided laser beam takes place. That laser beam processes one pipe after the other and becomes this Purpose according to the dimensions of the tube sheet and the Pipes from pipe to pipe and then according to the circumference of the Pipe along.
  • the Joining gap between the pipe ends and the assigned openings of the tube sheet is smaller than 0.1mm all around.
  • the laser welding can also be done under protective gas, with a pulsed ND / YAG laser.
  • the tubes (1) are with this tube sheet (2) along a their entire circumference weld (3) with the Tube plate (2) connected, which, as shown in Fig. 3, a has oval cross section with pointed ends, the Longitudinal axis (5) at about 45 ° to the tube sheet (2) and to Pipe axes (4) runs.
  • the weld seam (3) by a Laser beam generated extends from one Not shown collection room facing the heat exchange medium Side (2a) of the tube sheet (2) to below it Underside (2b). It has a rounded, the pipe mouth facing inner contour (6), each tangent in the Side wall (2a) of the tube sheet (2) or into the inner wall (1a) the pipes (1) pass over.
  • the weld seam therefore forms a kind Inlet funnel at the mouth of the pipes. It is pending nowhere on the inner wall (2a).
  • the weld seam then receives that in FIG. 3 shown shape. It is at point (8), measured under one Angle of 45 ° the bisector between the bottom (2b) of the tube sheet (2) and the outer wall of the tube sheet (1) occupies greater than the wall thickness (s) of the tube (1); (a) is therefore greater than (s).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laser Beam Processing (AREA)

Description

Die Erfindung betrifft einen Wärmetauscher nach dem Oberbegriff des Patentanspruchs 1, sowie ein Verfahren zur Herstellung des Wärmetauschers.The invention relates to a Heat exchanger according to the preamble of claim 1, and a method of manufacturing the heat exchanger.

Die Rohr-Bodenverbindungen für Wärmetauscher, insbesondere für die Kühler von Kraftfahrzeugmotoren, aber auch für Kondensatoren, Verdampfer oder Ladeluftkühler, sind immer mit gewissen Problemen behaftet, weil die Abmessungen von Rohren und Rohrböden aus Raum- und Gewichtsgründen möglichst klein sein sollen und weil die in die Rohrböden eingefügten Rohrenden zum einen mechanisch festsitzen müssen und zum anderen aber auch die notwendige Dichtheit erzielt werden muß, um Verluste des Wärmetauschmediums zu vermeiden. Für Wärmetauscher mit Aluminiumrohren und Aluminiumboden ist es bekannt, die Rohre in sogenannte Durchzüge des Bodens einzufügen und zu verlöten. In der Regel muß anschließend aber noch ein gesonderter Abdichtvorgang unter Verwendung von Silikon durchgeführt werden. Dies setzt zum einen verhältnismäßig aufwendige Arbeitsvorgänge für das Verlöten voraus und, weil gelötete Wärmetauscher nicht die notwendige Dichtheit erzielen, einen anschließenden Reinigungsvorgang mit umweltunverträglichen Mitteln, sowie danach den Vorgang der Silikonisierung. The pipe-floor connections for heat exchangers, in particular for the radiators of motor vehicle engines, but also for capacitors, Evaporators or intercoolers are always included certain problems because of the dimensions of pipes and tube sheets as small as possible for space and weight reasons should be and because the pipe ends inserted into the tube sheets on the one hand mechanically stuck and on the other hand but also the necessary tightness must be achieved in order To avoid losses of the heat exchange medium. For heat exchangers with aluminum tubes and aluminum floor, it is known insert the pipes into so-called passages in the floor and to solder. As a rule, a separate one must be added afterwards Sealing process performed using silicone will. On the one hand, this is relatively complex Operations for soldering ahead and because soldered Heat exchanger does not achieve the necessary tightness, a subsequent cleaning process with environmentally incompatible Means, and then the process of siliconization.

Bekannt ist es auch, die in Durchzügen des Rohrbodens eingefügten Rohrenden mechanisch aufzuweiten und eine Gummidichtung vorzusehen. Hier treten Probleme durch das Einreißen der aufzuweitenden Rohrenden und durch verschobene Dichtungen auf, insbesondere wenn keine runden Rohrquerschnitte vorliegen. Hier gestaltet sich die Abdichtung besonders schwer.It is also known that those inserted in passages in the tube sheet Mechanically widen the pipe ends and a rubber seal to provide. Here problems arise by tearing the pipe ends to be expanded and by moving seals , especially if there are no round pipe cross-sections. The sealing is particularly difficult here.

Ein Wärmetauscher der eingangs genannten Art ist aus der FR-A 2 121 757 bekannt, wo eine Möglichkeit geschildert ist, zylindrische Rohre in Rohrböden von Wärmetauschern dadurch einzuschweißen, daß in die Öffnungen der Rohrböden oder, wenn die Rohre bis zum einen Ende der Rohrböden durchgesteckt sind, in Erweiterungen der Rohre, eine rotierend gehaltene Elektrode einwirkt, die eine Lichtbogenschweißung vornimmt und das geschmolzene und in der Regel zusätzlich zugeführte Material dann zu einer Schweißnaht formt, die sowohl in die Innenwandung des Rohres als auch in die Oberfläche des Rohrbodens ausläuft. Die dort verwendeten Rohrböden besitzen aber eine Stärke, die wesentlich mehr als das Zehnfache der Dicke der Rohrwandung beträgt. Solche Lichtbogenschweißungen würden sich bei dünneren Rohrböden, insbesondere wenn sie aus Aluminium bestehen, nicht durchführen lassen.A heat exchanger of the type mentioned is out FR-A 2 121 757, where one possibility is described is cylindrical tubes in tube sheets of heat exchangers weld that into the openings of the tube sheets or if the tubes are pushed through to one end of the tube sheets are, in extensions of the pipes, a rotating one Electrode acts on an arc weld carries out and the melted and usually additionally supplied Material then forms a weld that both in the inner wall of the tube as well as in the surface of the Tube sheet leaks. Have the tube sheets used there but a strength that is significantly more than ten times that Thickness of the tube wall is. Such arc welds would look at thinner tube sheets, especially if they were made from Aluminum, do not allow to be carried out.

Aus der DE 30 36 427 A1 ist schließlich ein Laserstrahl-Reflexionssystem bekannt, mit dem es möglich ist, einen aus einer Spiegelanordnung bestehenden Laserstrahlkopf zu drehen und dadurch eine kreisrunde Schweißnaht mit beliebigem Durchmesser herzustellen. Auch dort ist jedoch nur eine Anwendung auf eine Rohr-Bodenverbindung gezeigt, bei der der Rohrboden um Größenordnungen größer ist als die Wandstärke des Rohres.Finally, DE 30 36 427 A1 describes a laser beam reflection system known with which it is possible to get one out to rotate an existing laser beam head mirror arrangement and therefore a circular weld with any diameter to manufacture. However, there is also only one application there shown on a pipe-floor connection, in which the tube sheet is by orders of magnitude greater than the wall thickness of the tube.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Wärmetauscher der eingangs genannten Art so auszubilden, daß die Forderungen nach mechanischem Halt und Dichtheit der Rohr-Bodenverbindung erfüllt sind, auch wenn die Abmessungen von Rohren und Rohrböden aus Gewichtsgründen nur sehr klein sind. Weiterhin soll ein Verfahren zur Herstellung des Wärmetauschers angegeben werden. The invention is therefore based on the object of a heat exchanger of the type mentioned at the beginning that the requirements for mechanical stability and tightness of the pipe-floor connection are met are, even if the dimensions of pipes and tube sheets are very small for weight reasons. Furthermore, a Methods of manufacturing the heat exchanger can be specified.

Zur Lösung dieser Aufgabe werden die Merkmale des Patentanspruchs 1, beziehungsweise des Patentanspruchs 7 vorgesehen.To solve this problem, the features of the claim 1, or of claim 7 provided.

Durch diese Ausgestaltung wird es möglich, nur durch einen Arbeitsgang sowohl den notwendigen mechanischen Halt als auch die erforderliche Dichtheit zu erreichen. Zusätzliche Arbeitsvorgänge für ein Silikonisieren oder zusätzliches Einlegen von Dichtungen werden überflüssig. Es hat sich auch gezeigt, daß es durch die Erfindung in einfacher Weise möglich wird, auch Rohre mit komplizierten Querschnitten, insbesondere Flachrohre mit ovalem oder elliptischem Querschnitt oder Mehrkammerprofile, ausreichend fest und dicht mit relativ dünnen Rohrböden zu verschweißen. Der Rohrboden selbst braucht keine Durchzüge mehr aufzuweisen. Es ist lediglich notwendig, die Öffnungen im Rohrboden entsprechend genau an den Rohrquerschnitt anzupassen. Schließlich stellt die erfindungsgemäß hergestellte Schweißnaht auch keinen Widerstand für die Strömung im Wäremtauscher dar, weil kein Rohrüberstand wie beim Stand der Technik mehr vorliegt. Dadurch kann auch Rohrmaterial eingespart werden.This configuration makes it possible to use only one Operation both the necessary mechanical hold as well to achieve the required tightness. Additional operations for siliconizing or additional insertion of seals are superfluous. It has also been shown that it is possible through the invention in a simple manner will, especially pipes with complicated cross sections Flat tubes with oval or elliptical cross section or Multi-chamber profiles, sufficiently firm and tight with relative to weld thin tube sheets. The tube sheet itself no longer needs to have swipes. It is just necessary, the openings in the tube sheet must be made accordingly adjust the pipe cross-section. Finally, the invention produced weld seam also no resistance for the flow in the heat exchanger because there is no pipe protrusion as is more the case with the prior art. This can pipe material can also be saved.

Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Developments of the invention are characterized in the subclaims.

Zur Herstellung eines Wärmetauschers nach der Erfindung hat es sich als besonders vorteilhaft erwiesen, wenn die Öffnungen im Rohrboden zunächst so ausgelegt werden, daß die Rohrenden weitgehend spaltfrei in den Öffnungen gehalten sind, daß die Rohrenden dann in ihre zugeordneten Öffnungen so eingeschoben werden, daß sie bündig zu der an den Sammelraum angrenzenden Seite des Rohrbodens verlaufen, und daß dann die Laserschweißung durch einen entlang des Umfanges der Rohrenden geführten Laserstrahl erfolgt. Dieser Laserstrahl arbeitet dabei ein Rohr nach dem anderen ab und wird zu diesem Zweck entsprechend den Abmessungen des Rohrbodens und der Rohre von Rohr zu Rohr und dann entsprechend am Umfang des Rohres entlanggeführt.To manufacture a heat exchanger according to the invention it has proven to be particularly advantageous if the openings in the tube sheet are initially designed so that the Pipe ends kept largely gap-free in the openings are that the pipe ends are then in their assigned openings be inserted so that they are flush with the one at the collecting room adjoining side of the tube sheet, and that then laser welding through one along the circumference of the Tube ends guided laser beam takes place. That laser beam processes one pipe after the other and becomes this Purpose according to the dimensions of the tube sheet and the Pipes from pipe to pipe and then according to the circumference of the Pipe along.

Für die Herstellung ist es auch sehr vorteilhaft, wenn der Fügespalt zwischen den Rohrenden und den zugeordneten Öffnungen des Rohrbodens ringsum kleiner als 0,1mm ist. Die Laserschweißung kann ferner unter Schutzgas erfolgen, und zwar mit einem gepulsten ND/YAG-Laser.For the production, it is also very advantageous if the Joining gap between the pipe ends and the assigned openings of the tube sheet is smaller than 0.1mm all around. The laser welding can also be done under protective gas, with a pulsed ND / YAG laser.

Die Erfindung ist anhand eines Ausführungsbeispieles in der Zeichnung dargestellt und wird im folgenden erläutert. Es zeigen:

Fig. 1
Den Ausschnitt einer Draufsicht auf einen Rchrboden eines Kühlers für einen Kraftfahrzeugmotor mit eingeschweißten Rohren mit Ovalquerschnitt,
Fig. 2
in vergrößerter Darstellung den Schnitt durch eine Rohrbodenverbindung längs der Schnittlinie III-III in Fig. 1, jedoch noch vor dem Schweißvorgang, und
Fig. 3
die weitervergrößerte Darstellung des Schnittes III-III der Fig. 1 mit dem eingeschweißten Rohr.
The invention is illustrated in the drawing using an exemplary embodiment and is explained below. Show it:
Fig. 1
The section of a plan view of a floor of a radiator for a motor vehicle engine with welded pipes with an oval cross section,
Fig. 2
in an enlarged view the section through a tube sheet connection along the section line III-III in Fig. 1, but before the welding process, and
Fig. 3
the further enlarged view of section III-III of FIG. 1 with the welded tube.

Aus den Fig. 1 und 3 ist erkennbar, daß die Rohr-Bodenverbindung für den als Kühler für Kraftfahrzeugmotoren dienenden Wärmetauscher zwischen mehreren, in an sich bekannter Weise angeordneten und in nicht dargestellter Weise noch mit einem Netz von Kühlrippen versehenen Flachrohren (1) aus Aluminium und einem Rohrboden (2), ebenfalls aus Aluminium vorgenommen worden ist. Die Rohre sind dabei mit ihrer Achse (4) jeweils senkrecht zu dem Rohrdoden (2) ausgerichtet. Sie besitzen eine Wanddicke (s), die beim Ausführungsbeispiel wesentlich geringer ist als die Dicke (b) des Rohrbodens (2). Die Dicke (b) beträgt etwa das dreifache der Wandstärke (s) der Rohre (1).1 and 3 that the Pipe-floor connection for the cooler for motor vehicle engines serving heat exchanger between several, in known per se Arranged in a manner and in a manner not shown still with a network of cooling fins flat tubes (1) made of aluminum and a tube sheet (2), also made of aluminum has been made. The tubes are with their axis (4) each aligned perpendicular to the tube diode (2). she have a wall thickness (s) that in the embodiment is significantly less than the thickness (b) of the tube sheet (2). The thickness (b) is about three times the wall thickness (s) Pipes (1).

Die Rohre (1) sind mit diesem Rohrboden (2) über eine längs ihres gesamten Umfanges verlaufende Schweißnaht (3) mit dem Rohrboden (2) verbunden, die, wie Fig. 3 zeigt, einen etwa ovalen Querschnitt mit spitz auslaufenden Enden besitzt, dessen Längsachse (5) etwa unter 45° zum Rohrboden (2) und zu den Rohrachsen (4) verläuft. Die Schweißnaht (3), die durch einen Laserstrahl erzeugt wurde, erstreckt sich dabei von der einem nicht gezeigten Sammelraum für das Wärmetauschmedium zugewandten Seite (2a) des Rohrbodens (2) bis unterhalb von dessen Unterseite (2b). Sie weist eine abgerundete, der Rohrmündung zugewandte Innenkontur (6) auf, die jeweils tangential in die Seitenwand (2a) des Rohrbodens (2) bzw. in die Innenwand (1a) der Rohre (1) übergeht. Die Schweißnaht bildet daher eine Art Einlauftrichter an der Mündungsstelle der Rohre. Sie steht an keiner Stelle über die Innenwand (2a) vor.The tubes (1) are with this tube sheet (2) along a their entire circumference weld (3) with the Tube plate (2) connected, which, as shown in Fig. 3, a has oval cross section with pointed ends, the Longitudinal axis (5) at about 45 ° to the tube sheet (2) and to Pipe axes (4) runs. The weld seam (3) by a Laser beam generated extends from one Not shown collection room facing the heat exchange medium Side (2a) of the tube sheet (2) to below it Underside (2b). It has a rounded, the pipe mouth facing inner contour (6), each tangent in the Side wall (2a) of the tube sheet (2) or into the inner wall (1a) the pipes (1) pass over. The weld seam therefore forms a kind Inlet funnel at the mouth of the pipes. It is pending nowhere on the inner wall (2a).

Um diese Form der Schweißnaht zu erreichen, die strömungstechnisch außerordentlich günstig ist, weil kein Rohrüberstand mehr vorliegt, werden alle Rohre (1) zunächst wie in Fig. 2 gezeigt, mit ihren Rohrenden so in zugeordnete Öffnungen (7) des Rohrbodens (2) eingeschoben, daß ihre Enden bündig zu der Seite (2a) verlaufen. Dabei muß der zwischen den Öffnungen (7) und dem Außenumfang der Rohre (1) bestehende Fügespalt (f) so gewählt sein, daß er ringsum kleiner als 0,1 mm ist. Sind die Rohre in dieser Weise ausgerichtet und angeordnet, wird die Schweißnaht (3) mit Hilfe eines gepulsten Nd-YAG-Laserstrahls erzeugt, der von Rohr zu Rohr und dort jeweils längs des gesamten Umfanges des Endes des Rohres (1) von der Seite des Salnmenraumes her geführt ist. Der Laserstrahl arbeitet daher nacheinander alle Rohre (1) an der bündig im Rohrboden (2) steckenden Seite ab. Die Schweißnaht erhält dann die in Fig. 3 gezeigte Form. Sie ist an der Stelle (8), gemessen unter einem Winkel von 45°, den die Winkelhalbierene zwischen der Unterseite (2b) des Rohrbodens (2) und der Außenwand des Rohrbodens (1) einnimmt, größer als die Wandstärke (s) des Rohres (1); (a) ist daher größer als (s).To achieve this shape of the weld seam, the fluidic is extremely cheap because there is no longer any pipe overhang is present, all tubes (1) are initially shown in FIG. 2, with their tube ends in assigned openings (7) in the tube sheet (2) inserted that their ends are flush to the side (2a) run. The must between the openings (7) and the existing gap (f) selected the outer circumference of the tubes (1) be smaller than 0.1 mm all around. Are the The pipes are aligned and arranged in this way Weld seam (3) using a pulsed Nd-YAG laser beam generated from tube to tube and there along the entire length Circumference of the end of the tube (1) from the side of the Salnmenraum is brought forth. The laser beam therefore works successively all pipes (1) flush with the pipe floor (2) stuck side. The weld seam then receives that in FIG. 3 shown shape. It is at point (8), measured under one Angle of 45 ° the bisector between the bottom (2b) of the tube sheet (2) and the outer wall of the tube sheet (1) occupies greater than the wall thickness (s) of the tube (1); (a) is therefore greater than (s).

Diese Form der Schweißnaht, die sich durch die besondere Laser-Schweißung ergibt, gibt der Rohr-Bodenverbindung eine außerordentlich gute Festigkeit. Es wäre auch möglich, mehrere Rohre gleichzeitig durch mehrere Laser, oder - weil das Lochbild im Rohrboden ein regelmäßiges Muster darstellt - durch Strahlteilung mit dem Rohrboden zu verschweißen.This form of the weld seam, which is characterized by the special laser welding results, the pipe-floor connection gives an extraordinary good strength. It would also be possible to have multiple pipes by several lasers at the same time, or - because the hole pattern in the Pipe base is a regular pattern - through beam splitting to be welded to the tube sheet.

Claims (10)

  1. A heat exchanger, particularly for a radiator for motor vehicle engines, with a tube block through which a heat exchange medium passes and which has extending parallel with one another, tubes (1) which have at least one end supported in a tube-plate (2) adjacent a collecting space to which they are connected in sealing-tight manner, the tube ends which are pushed into the tube-plate (2) being welded to the tube-plate by a welded seam (3) extending along its entire periphery and the interior contours (6) of which merge flush into the inside walls (1a) of the tubes and the side (2a) of the tube-plate (2) which is directed at the interior of the collecting space, characterised in that the tubes (1) are constructed as flat tubes and, like the tube-plate (2) consist of aluminium and in that the welded seam (3) is a laser welded seam which extends into a region of the tube (1) which is situated at a distance from the side (2b) of the tube-plate (2) which is remote from the collecting space.
  2. A heat exchanger according to claim 1, characterised in that the tube axes (4) of each tube (1) are at right-angles to the tube-plate (2) and in that the welded seam (3) has an oval-shaped cross-section the longitudinal axis (5) of which extends substantially at 45° to the tube axis (4).
  3. A heat exchanger according to one of claims 1 or 2, characterised in that the welded seam (3), measured at an angle of 45° at the point of intersection between the outside wall of the tube and the under side (2b) of the tube, has a thickness (a) which is greater than the thickness (s) of the tube wall.
  4. A heat exchanger according to one of claims 1 to 3, characterised in that the inner contours (6) of the welded seam (3) are rounded off to produce a kind of inlet funnel at the tube mouth.
  5. A heat exchanger according to claim 1, characterised in that the tubes (1) have an oval or elliptical cross-section.
  6. A heat exchanger according to claim 1, characterised in that the tubes (1) are constructed as multi-chamber profiled sections with a flat cross-section.
  7. A method of producing a heat exchanger according to claim 1 or one of the other claims 2 to 6, characterised in that the apertures (7) in the tube-plate (2) are so designed that the tube ends are held in the apertures in a substantially gap-free manner and in that the tube ends are so pushed into their associated apertures (7) that they extend flush with that side (2a) of the tube-plate (2) which is adjacent the collecting space and in that then the laser weld is carried out by a laser beam guided along the periphery of the tube ends.
  8. A method according to claim 7, characterised in that the joint gap (f) between the tube ends and the associated apertures (7) in the tube-plate (2) is less than 0.1 mm all round.
  9. A method according to claim 7, characterised in that welding is carried out under a barrier gas.
  10. A method according to claim 7, characterised in that welding is carried out with a pulsed low pressure YAG (yttrium-aluminium-garnet) laser.
EP94118838A 1993-12-22 1994-11-30 Heat exchanger Expired - Lifetime EP0660064B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4343825 1993-12-22
DE4343825A DE4343825A1 (en) 1993-12-22 1993-12-22 Pipe-floor connection for a heat exchanger

Publications (3)

Publication Number Publication Date
EP0660064A2 EP0660064A2 (en) 1995-06-28
EP0660064A3 EP0660064A3 (en) 1995-11-29
EP0660064B1 true EP0660064B1 (en) 1998-05-27

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EP94118838A Expired - Lifetime EP0660064B1 (en) 1993-12-22 1994-11-30 Heat exchanger

Country Status (4)

Country Link
US (1) US5749414A (en)
EP (1) EP0660064B1 (en)
DE (2) DE4343825A1 (en)
ES (1) ES2116515T3 (en)

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DE10032975A1 (en) * 2000-07-06 2002-01-17 Behr Gmbh & Co Process for hard soldering aluminum parts comprises melting a solder additive consisting of a powder made from aluminum solder balls coated with a flux which reduces the oxide layer by introducing heat via a laser beam, and hardening

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DE19810387C1 (en) * 1998-03-11 1999-07-29 Autz & Herrmann Maschf Sheet feeder, esp. for contactless feeding of printed paper sheets in or in connection with printing machines, e.g. in a drier
DE19849449C2 (en) * 1998-10-28 2003-05-28 Hanf Carl Elino Ind Ofenbau Method and system for connecting heat exchanger parts
AT411396B (en) * 1999-06-01 2003-12-29 Schoeller Bleckmann Nooter App HEAT EXCHANGER AND METHOD FOR WELDING HEAT EXCHANGER TUBES TO A PIPE PLATE
AU4090600A (en) 1999-06-30 2001-01-04 Rohm And Haas Company High performance heat exchangers
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US5749414A (en) 1998-05-12
EP0660064A3 (en) 1995-11-29
DE4343825A1 (en) 1995-06-29
ES2116515T3 (en) 1998-07-16
EP0660064A2 (en) 1995-06-28
DE59406079D1 (en) 1998-07-02

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