DE629330C - Process for electrical resistance welding, in particular for butt welding, of aluminum and other metals that are easy to clean and difficult to weld - Google Patents
Process for electrical resistance welding, in particular for butt welding, of aluminum and other metals that are easy to clean and difficult to weldInfo
- Publication number
- DE629330C DE629330C DES117342D DES0117342D DE629330C DE 629330 C DE629330 C DE 629330C DE S117342 D DES117342 D DE S117342D DE S0117342 D DES0117342 D DE S0117342D DE 629330 C DE629330 C DE 629330C
- Authority
- DE
- Germany
- Prior art keywords
- welding
- aluminum
- weld
- thermocouples
- difficult
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/18—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of non-ferrous metals
- B23K11/185—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of non-ferrous metals of aluminium or aluminium alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Description
DEUTSCHES REICHGERMAN EMPIRE
AUSGEGEBEN AM 28. APRIL 1936 ISSUED APRIL 28, 1936
REICHSPATENTAMTREICH PATENT OFFICE
PATENTSCHRIFTPATENT LETTERING
M 629330 KLASSE 21h GRUPPE 2915 M 629330 CLASS 21h GROUP 2915
Patentiert im Deutschen Reiche vom 2. März 1935 abPatented in the German Empire on March 2, 1935
Beim elektrischen Widerstandsschweißen, insbesondere beim Stumpfschweißen, von Aluminium, Kupfer und ähnlichen schwer schweißbaren Metallen treten Schwierigkeiten dadurch auf, daß diese Metalle beim Übergang vom festen in den flüssigen Zustand nur verhältnismäßig kurze Zeit teigig sind. Bei derartigen Metallen besteht die Gefahr, daß das Material vor Beginn des Stauch-Vorganges entweder flüssig wird oder noch kalt ist. In beiden Fällen wird die Schweißung fehlerhaft, sofern überhaupt eine Schweißverbindung ausgeführt werden kann. Dies hat dazu geführt, daß man im allgemeinen Stumpfschweißungen von Aluminium zu vermeiden suchte und sich begnügte, dünne Aluminiumstücke durch Punktschweißung zu verbinden, wo man durch die große Zahl der Schweißstellen Fehler an einzelnen Stel-In electrical resistance welding, especially butt welding, of aluminum, Difficulties arise with copper and similar metals that are difficult to weld because these metals transition are doughy for a relatively short time from solid to liquid. With such metals there is a risk of that the material before the start of the upsetting process either becomes liquid or still is cold. In both cases the weld will be faulty, if any Weld connection can be performed. This has led to the general Attempted to avoid butt welding of aluminum and contented himself with creating thin pieces of aluminum by spot welding connect, where due to the large number of welding points, defects at individual points
ao len ausgleichen kann.ao len can compensate.
Bei gleichmäßiger Erwärmung des Werkstückes weist der Temperaturanstieg vor dem Flüssigwerden des Materials einen Haltepunkt bzw. einen Knick auf. Die Erfindung beruht auf der Erkenntnis, daß eine einwandfreie Schweißung von Aluminium und sonstigen schwer schweißbaren Metallen sich nur erzielen läßt, wenn der Erwärmungsvorgang an diesem Knickpunkt der Temperaturkurve oder in seiner Nähe unterbrochen und gleichzeitig der Stauchvorgang eingeleitet wird.If the workpiece is heated evenly, the temperature rise before The material becomes liquid at a break point or a kink. The invention is based on the knowledge that a perfect welding of aluminum and other Difficult-to-weld metals can only be achieved if the heating process is at this break point in the temperature curve or interrupted in its vicinity and at the same time the upsetting process is initiated.
Erfindungsgemäß wird der Knickpunkt der Temperaturkurve durch besondere Meßinstrumente genau überwacht, wobei es wesentlich ist, daß durch geringe Schweiß-Stromstärken die erforderliche Schweißtemperatur nicht nur an der Übergangsstelle, sondern in einem größeren Bereich des Werkstückes erzielt wird und demgemäß auch lange Stauchwege angewendet werden. Der größere Stauchweg gestattet dadurch, daß das verbrannte Material herausgequetscht wird, ein sicheres Ausscheiden der gebildeten Oxyde und bewirkt die Bildung eines feinen Kornes. Durch die Verwendung geringer Stromstärken wird neben der größeren. Erwärmungslänge auch ein langsamer Temperaturanstieg des Werkstückes erzielt, wodurch mögliche Kaltschweißungen an einzelnen Punkten vermieden werden.According to the invention, the break point of the temperature curve is determined by special measuring instruments closely monitored, it being essential that by low welding currents the required welding temperature not only at the transition point, but in a larger area of the workpiece is achieved and accordingly long compression paths are used. The greater compression path allows the burned material is squeezed out, a safe elimination of the formed Oxides and causes the formation of a fine grain. By using less Amperages will be next to the larger. Heating length also a slow temperature rise of the workpiece is achieved, which makes possible cold welds on individual Points are avoided.
Zur Feststellung der richtigen Schweißtemperatur können Thermoelemente verwendet werden, durch die das genaue Auftreten des Knickpunktes festgestellt werden kann. Es ist beispielsweise durch Spannungsmessung an den Thermoelementen ohne Schwierigkeiten möglich, selbsttätig die Abschaltung des Schweißstromes und denThermocouples can be used to determine the correct welding temperature by which the exact occurrence of the break point can be determined. It is for example by measuring voltage at the thermocouples possible without difficulty, automatic shutdown of the welding current and the
*) Von dem Patent sucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Dipl.-Ing. Horst Pflug in Berlin-CharlottenburgDipl.-Ing. Horst Pflug in Berlin-Charlottenburg
620330620330
Stauchvorgang einzuleiten. Wenn von einer selbsttätigen Schalteinrichtung abgesehen werden soll, Kann durch Beobachtung eines .Zeigers der Bedienungsmann igenau den Sferlauf der Temperaturkurve feststellen und. -entsprechend die erforderlichen Handgriffe ans-. führen.Initiate upsetting process. If an automatic switching device is not used should, the operator can precisely control the run by observing a pointer determine the temperature curve and. -corresponding the necessary steps. to lead.
Das Verfahren gemäß der Erfindung hat auch sehr erhebliche wirtschaftliche VorteileThe method according to the invention also has very considerable economic advantages
ίο deshalb, weil durch die Anwendung geringerer Schweißströme in Verbindung· mrit dem langsamen Temperaturanstieg es nicht mehr erforderlich ist, für die Aluminiumschweißung die Stumpfschweißmaschinen für besonders hohe Leistung" zu bauen .und sogar auf Stumpfschweißmaschinen, die an sich für Eisenschweißungen vorgesehen sind, annähernd gleiche Querschnitte in Aluminium gesehweißt werden können.ίο because less because of the application Welding currents in connection with the slow rise in temperature no longer exist is required for aluminum welding to build the butt welding machines for particularly high performance "and even to Butt welding machines, which are intended for iron welding, approximate the same cross-sections can be welded in aluminum.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES117342D DE629330C (en) | 1935-03-02 | 1935-03-02 | Process for electrical resistance welding, in particular for butt welding, of aluminum and other metals that are easy to clean and difficult to weld |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES117342D DE629330C (en) | 1935-03-02 | 1935-03-02 | Process for electrical resistance welding, in particular for butt welding, of aluminum and other metals that are easy to clean and difficult to weld |
Publications (1)
Publication Number | Publication Date |
---|---|
DE629330C true DE629330C (en) | 1936-04-28 |
Family
ID=7534202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES117342D Expired DE629330C (en) | 1935-03-02 | 1935-03-02 | Process for electrical resistance welding, in particular for butt welding, of aluminum and other metals that are easy to clean and difficult to weld |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE629330C (en) |
-
1935
- 1935-03-02 DE DES117342D patent/DE629330C/en not_active Expired
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