DE1020045B - Process for the thermal treatment of a sheet steel weld seam or cutting edge - Google Patents
Process for the thermal treatment of a sheet steel weld seam or cutting edgeInfo
- Publication number
- DE1020045B DE1020045B DEW15200A DEW0015200A DE1020045B DE 1020045 B DE1020045 B DE 1020045B DE W15200 A DEW15200 A DE W15200A DE W0015200 A DEW0015200 A DE W0015200A DE 1020045 B DE1020045 B DE 1020045B
- Authority
- DE
- Germany
- Prior art keywords
- thermal treatment
- weld seam
- sheet steel
- steel weld
- cutting edge
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- 239000010959 steel Substances 0.000 title claims description 4
- 238000007669 thermal treatment Methods 0.000 title claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
Verfahren zur thermischen Behandlung einer Stahlblechschweißnaht oder -schneidkante Die Erfindung betrifft ein Verfahren zur thermischen Behandlung einer Stahlblechschweißnaht oder -schneidkante. Beim Schweißen und Schneiden von Blechen, wobei es selbstverständlich gleichgültig ist, ob der Brenner bzw. die Elektrode oder das Werkstück bewegt wird, entsteht hinter dem Arbeitsgerät infolge der schnellen Abkühlung Martensit und dadurch eine harte Zone mit Rißgefahr. Die bisherigen Versuche, die Bildung einer solchen harten Zone durch entsprechende Auswahl des Werkstoffes und durch Glühen des Werkstückes in einem Glühofen zu beheben, haben zu keinem befriedigenden Ergebnis geführt, da sie einerseits sehr unwirtschaftlich sind und andererseits es nicht gelingt, die einmal bei der Abkühlung aufgetretenen Haarrisse durch das Nachglühen zu beseitigen. Es wurde auch bereits versucht, das Nachglühen durch einen dem Arbeitsgerät zugeordneten Wärmeerzeuger durchzuführen. Aber auch diese Versuche führten zu keinem Erfolg, da sie in Temperaturbereichen durchgeführt wurden, die unwirtschaftliche Wärmemengen erforderten oder aber die Wärmezufuhr erst dann. erfolgte, nachdem, wie beim Nachglühen im Glühofen, eine Martensitbildung bereits stattgefunden hatte.Process for the thermal treatment of a sheet steel weld seam or -cutting edge The invention relates to a method for the thermal treatment of a Sheet steel weld seam or cutting edge. When welding and cutting sheet metal, it is of course unimportant whether the torch or the electrode or the workpiece is moved, arises behind the implement as a result of the fast Cooling down martensite and thus a hard zone with the risk of cracking. The previous attempts the formation of such a hard zone by appropriate selection of the material and fixing it by annealing the workpiece in an annealing furnace do not lead to any satisfactory result Result led because they are on the one hand very uneconomical and on the other hand the hairline cracks that once occurred during cooling do not succeed Eliminate afterglow. Attempts have also been made to reduce the afterglow with a to carry out the heat generator assigned to the work device. But also these attempts were unsuccessful because they were carried out in temperature ranges that Uneconomical amounts of heat required or the heat supply only then. took place, after, as with afterglow in the annealing furnace, martensite formation has already taken place would have.
Es hat sich nun überraschenderweise ergeben, daß die Nachschaltung eines Wärmeerzeugers zum Zweck der Verhinderung der Martensitbildung dann mit Erfolg durchgeführt werden kann, wenn entsprechend dem Vorschlag der Erfindung der Abstand zwischen Arbeitsgerät und Wärmeerzeuger so gewählt wird, daß die Wärmezufuhr im Temperaturbereich der kürzesten Umwandlungszeit erfolgt, und die Temperatur gemäß einer angenäherten Isotherme so lange gehalten wird, bis die unmittelbare Umwandlung des Austenits in. Ferrit-Perlit vollzogen ist. Die Zuführung der zusätzlichen Wärme in diesem angegebenen Temperaturbereich ermöglicht es, in kürzester Zeit und dadurch mit einer geringsten Wärmezufuhr auszukommen. Erst dadurch gelingt es, den benutzten Wärmeerzeuger in praktisch brauchbaren Baugrößen zu halten. Der Erfindung liegt die Erkenntnis zugrunde, daß die Bildung von Martensit am wirtschaftlichsten. verhindert werden kann, wenn, es ;gelingt, die Abkühlungs#hurve im Temperaturbereich der kürzesten Umwandlungszeit des dem Werkstoff entsprechenden ZTU-Diagramms für isothermische Versuchsführung in eine Isotherme umzubiegen. Das Zeit-Tempera,tur-Umwandlungs-Diagramm (ZTU-Diagramm) für isothermische Versuchsführung eines Werkstoffes ergibt sich, wenn statt der größten Umwandlun.gsgeschwin.digkeit die Umwandlungszeit in logarithmischem Maßstab in Abhängigkeit von der Temperatur aufgetragen wird. Der Beginn und das Ende der Umwandlung des Austenits in Ferrit-Perlit wird dabei durch zwei Kurven wiedergegeben, deren Abstand voneinander die L'mwandlungszeit während der entsprechenden Temperatur -darstellt.It has now surprisingly been found that the downstream a heat generator for the purpose of preventing martensite formation then with success can be carried out if, according to the proposal of the invention, the distance between the implement and the heat generator is chosen so that the heat supply in the Temperature range of the shortest transformation time takes place, and the temperature according to an approximate isotherm is held until the immediate conversion of austenite in. Ferrite-pearlite is completed. The supply of additional heat in this specified temperature range it enables in the shortest possible time and thereby get by with the least amount of heat. Only then is it possible to use the one used To keep heat generators in practically usable sizes. The invention lies based on the knowledge that the formation of martensite is the most economical. prevented if, it; succeeds, the cooling curve in the temperature range of the shortest Conversion time of the ZTU diagram corresponding to the material for isothermal To bend the experiment into an isotherm. The time-temperature, tur-transformation diagram (ZTU diagram) for isothermal testing of a material results if instead of the greatest conversion speed the conversion time in logarithmic Scale is plotted as a function of the temperature. The beginning and that The end of the transformation of the austenite into ferrite-pearlite is indicated by two curves reproduced, the distance from each other the L'mwandlungszeit during the corresponding Temperature -represents.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEW15200A DE1020045B (en) | 1954-10-29 | 1954-10-29 | Process for the thermal treatment of a sheet steel weld seam or cutting edge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEW15200A DE1020045B (en) | 1954-10-29 | 1954-10-29 | Process for the thermal treatment of a sheet steel weld seam or cutting edge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1020045B true DE1020045B (en) | 1957-11-28 |
Family
ID=7595457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEW15200A Pending DE1020045B (en) | 1954-10-29 | 1954-10-29 | Process for the thermal treatment of a sheet steel weld seam or cutting edge |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1020045B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0103348A1 (en) * | 1982-05-21 | 1984-03-21 | Kawasaki Steel Corporation | UO steel pipe welding method |
| EP2756905A1 (en) * | 2013-01-18 | 2014-07-23 | Messer Cutting Systems GmbH | Method for the thermal cutting of a workpiece made of steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE866135C (en) * | 1951-11-27 | 1953-02-09 | Westfalia Dinnendahl Groeppel | Process for cutting sheet metal using a cutting torch |
| DE925440C (en) * | 1943-12-17 | 1955-03-21 | Deutsche Edelstahlwerke Ag | Device for post-treating the cutting edge produced by a cutting torch on elongated metal sheets, plates or similar workpieces to be trimmed |
-
1954
- 1954-10-29 DE DEW15200A patent/DE1020045B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE925440C (en) * | 1943-12-17 | 1955-03-21 | Deutsche Edelstahlwerke Ag | Device for post-treating the cutting edge produced by a cutting torch on elongated metal sheets, plates or similar workpieces to be trimmed |
| DE866135C (en) * | 1951-11-27 | 1953-02-09 | Westfalia Dinnendahl Groeppel | Process for cutting sheet metal using a cutting torch |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0103348A1 (en) * | 1982-05-21 | 1984-03-21 | Kawasaki Steel Corporation | UO steel pipe welding method |
| EP2756905A1 (en) * | 2013-01-18 | 2014-07-23 | Messer Cutting Systems GmbH | Method for the thermal cutting of a workpiece made of steel |
| DE102013000796A1 (en) * | 2013-01-18 | 2014-07-24 | Messer Cutting Systems Gmbh | Method for thermal cutting a workpiece made of steel |
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