EP0394754A2 - Procédé et dispositif pour le traitement thermique sélectif de la zone d'un cordon de soudure d'un tube soudé longitudinalement - Google Patents

Procédé et dispositif pour le traitement thermique sélectif de la zone d'un cordon de soudure d'un tube soudé longitudinalement Download PDF

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Publication number
EP0394754A2
EP0394754A2 EP90106913A EP90106913A EP0394754A2 EP 0394754 A2 EP0394754 A2 EP 0394754A2 EP 90106913 A EP90106913 A EP 90106913A EP 90106913 A EP90106913 A EP 90106913A EP 0394754 A2 EP0394754 A2 EP 0394754A2
Authority
EP
European Patent Office
Prior art keywords
weld seam
area
tube
temperature
heating means
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.)
Granted
Application number
EP90106913A
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German (de)
English (en)
Other versions
EP0394754B1 (fr
EP0394754A3 (fr
Inventor
Friedhelm Schmitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0394754A2 publication Critical patent/EP0394754A2/fr
Publication of EP0394754A3 publication Critical patent/EP0394754A3/fr
Application granted granted Critical
Publication of EP0394754B1 publication Critical patent/EP0394754B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a method for the selective heat treatment of the weld region of a longitudinally welded metal tube and a device suitable therefor.
  • the method is particularly applicable to pipes with a diameter of less than 100 mm and a wall thickness of less than 2.5 mm. It is particularly suitable for pipes of even smaller dimensions, such as those used in heat exchangers and steam condensers, with pipe diameters of, for example, 10 to 50 mm and wall thicknesses of between about 0.3 and 1 mm.
  • the invention is of particular importance for pipes made of stainless steel with proportions of chromium and optional components such as nickel and / or molybdenum with a simultaneously low carbon content.
  • the heat treatment is intended to improve the corrosion properties, particularly with regard to pitting corrosion.
  • the object of the present invention is to provide a method which enables the weld seam to be heated quickly over a short distance and keeps the amount of heating means low.
  • a device suitable for this purpose is to be specified.
  • a method for selective solution annealing of the weld seam in particular including its heat affected zone, of a longitudinally welded metal tube, the tube in particular having a diameter of less than 100 mm and a wall thickness of less than 2.5 mm, and wherein a heat treatment device and the The pipe is moved relative to one another with the following features:
  • the weld seam is heated, preferably by means of at least one arc generated with at least one non-melting electrode, under protective gas to such an extent that its outer region is melted; the weld seam is then selectively held by further heating means, for example further arcs, infrared radiators or induction coils, for a predefinable period under protective gas at least at a temperature required for the solution annealing of the tube material, but at least in the interior area below the melting temperature and then cooled under protective gas.
  • the invention is based on the knowledge that, for most applications of the pipes considered here, only the corrosion resistance of the weld seam is important for attacks from the inside, ie the quality of the weld seam must above all Things inside can be improved by heat treatment, whereby a small loss of quality in a relatively small outside area is not decisive. It is therefore entirely permissible to melt the outer area of the weld seam when the weld seam area is heated, which enables rapid heat input in a small space.
  • phase transition from the solid to the molten state causes a high heat absorption of the outer area of the weld seam, this amount of heat being partly passed on to the inner area of the weld seam by heat conduction when the outer area solidifies, so that this inner area also heats up very quickly, but not up to there unwanted melting. Subsequently, it is only necessary to keep the temperature of the weld seam in the desired temperature range necessary for solution annealing, which is possible by means of further heating means, in particular by induction coils or by illuminating the weld seam in a linear or punctiform manner. Of course, it should be noted that both when heating z. B.
  • a preferred field of application of the invention is heat exchanger tubes made of stainless, in particular molybdenum-containing steels, in which solution annealing of the weld seam region can be carried out above 1200 ° C. or even above 1300 ° C.
  • the rest of the pipe naturally heats up during heat treatment, but at a significantly lower temperature than that of the weld area. Such heating of the entire pipe is quite desirable and necessary.
  • the pipe does not become so warm outside the weld seam area that it could be deformed by the transport mechanism inadmissibly, so that a high quality of the pipes is guaranteed, which reduces the rejects and facilitates the quality checks that may be necessary later.
  • This plays an important role in particular for particularly thin-walled pipes with a wall thickness of approximately 0.3 to 0.5 mm.
  • the proposed combination of an electrode with other heating means enables a very compact construction of the heat treatment section and combines the advantages of rapid heating by an arc with the favorable properties of other heating means, in particular infrared heaters and induction coils with regard to maintaining an existing temperature.
  • FIG. 1 the basic structure of a longitudinally welded metal tube is shown in cross-section in FIG. 1, and in FIG. 2 a basic illustration of the device is shown with a diagram of the temperature curves arranged below it in spatial association with the heat treatment device shown.
  • the cross section shown in FIG. 1 through a longitudinally welded tube 1 illustrates the areas of the tube which are essential for the invention.
  • the individual zones are not shown to scale in order to better illustrate basic things.
  • the weld seam and the heat affected zone are smaller.
  • the weld seam 2 is generally located on the top of the tube 1 during manufacture. It is surrounded by a heat-affected zone 3, in which the welding process has left changes and inhomogeneities.
  • the rest of the tube consists of unchanged base material, although it may be advisable, for safety reasons, to include an area 4 outside the heat affected zone 3 in a heat treatment, since the exact extent of the heat affected zone 3 is not always known.
  • the weld seam 2 itself has an outer region 2.1, the corrosion properties of which play no role in pipes which are only subjected to corrosive stress on the inside, and Interior area 2.2 whose properties can be decisive for the corrosion resistance of the entire pipe.
  • Fig. 2 shows schematically a heat treatment line, which can be part of a complete production device for longitudinally welded metal pipes or can be arranged separately.
  • the tube 1 passes through this distance by being carried and moved by transport rollers 11 or similar means.
  • the weld seam 2 or the entire weld seam region are heated by an arc 7 at the beginning of the heat treatment. For this first heating, other means with high energy density, such as.
  • a conventional current source 5.1 which is connected on the one hand via a supply line 5.2 to the tube 1 and on the other hand to a non-melting electrode 5, feeds the arc 7.
  • the surrounding area of the arc 7 can be kept under protective gas 1 by means of a conventional device 6.
  • further heating means 8 in the present exemplary embodiment infrared radiators, which keep the temperature of the weld seam area above the minimum temperature Tmin necessary for solution annealing.
  • the distance between the arc 7 and the first infrared radiator 8 is selected such that the outer region 2.1 of the weld seam 2.2 melted by the arc 7 can solidify again on the way by dissipating heat to the inner region 2.2, so that the entire weld region increases approximately same temperature is above Tmin.
  • a protective gas atmosphere (indicated by arrows) around the entire tube 1 can be maintained by a quartz glass tube 9.
  • a cooling section 10 which is also under protective gas, is connected to the heat treatment section. Under the heat treatment device and with spatial association with it, a diagram is shown in FIG. 2 to illustrate the temperature profiles.
  • the temperature is plotted on the abscissa, two temperatures being given by way of example to illustrate the material-dependent region in question.
  • the distance is plotted on the ordinate according to the length of the heat treatment device, whereby (assuming a constant throughput speed of the tube this is equivalent to the time.
  • the diagram therefore represents the temporal or spatial course of the temperatures during the heat treatment.
  • the dashed line Tmir indicates the temperature that is at least necessary for solution annealing of the pipe material
  • line Ts indicates the melting temperature of the pipe material
  • line Ta illustrates the temperature in the outer region 2.1 of the weld seam 2
  • line Ti illustrates the temperature profile in the inner region 2.2 of the weld seam during It can be seen from the diagram that in the area of the arc 7 the outer area is heated to a temperature above the melting point Ts, but the inner area remains significantly below this temperature
  • Infrared emitters 8 equalize the temperatures of the outside area 2.1 and the inside area 2.2.
  • the outer region 2.1 is brought to higher temperatures than the inner region 2.2 during the further heat treatment, whereby it must be ensured in any case that the temperature Ti must lie between Trin and Ts, while it is permissible for the outer region 2.1 that this in between, as indicated by the dotted lines Ta ', exceeds the melting point Ts.
  • the temperature of the weld seam area is finally reduced under protective gas until protective gas is no longer necessary to avoid reactions with the surrounding atmosphere.
  • the present invention is particularly suitable for the heat treatment directly downstream of a pipe production plant.

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)
EP90106913A 1989-04-27 1990-04-11 Procédé et dispositif pour le traitement thermique sélectif de la zone d'un cordon de soudure d'un tube soudé longitudinalement Expired - Lifetime EP0394754B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3913973A DE3913973A1 (de) 1989-04-27 1989-04-27 Verfahren und vorrichtung zur selektiven waermebehandlung des schweissnahtbereiches eines laengsnahtgeschweissten rohres
DE3913973 1989-04-27

Publications (3)

Publication Number Publication Date
EP0394754A2 true EP0394754A2 (fr) 1990-10-31
EP0394754A3 EP0394754A3 (fr) 1992-10-14
EP0394754B1 EP0394754B1 (fr) 1994-08-17

Family

ID=6379624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106913A Expired - Lifetime EP0394754B1 (fr) 1989-04-27 1990-04-11 Procédé et dispositif pour le traitement thermique sélectif de la zone d'un cordon de soudure d'un tube soudé longitudinalement

Country Status (4)

Country Link
EP (1) EP0394754B1 (fr)
AT (1) ATE110116T1 (fr)
DE (2) DE3913973A1 (fr)
ES (1) ES2057241T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010044799A1 (de) * 2010-09-09 2012-04-26 Benteler Automobiltechnik Gmbh Stabilisator und Verfahren zum Herstellen eines Stabilisators
EP2357099B1 (fr) * 2010-02-16 2017-07-12 Benteler Automobiltechnik GmbH Stabilisateur et procédé destiné à la fabrication d'un stabilisateur
CN116689963A (zh) * 2023-06-25 2023-09-05 浙江摩多巴克斯科技股份有限公司 一种高强度钢管的激光焊接工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008060205A1 (de) * 2008-12-04 2010-06-10 Rolls-Royce Deutschland Ltd & Co Kg Verfahren zur Herstellung eines geschweißten Rotors für ein Gasturbinentriebwerk

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673276A (en) * 1951-02-01 1954-03-23 Babcock & Wilcox Co Post heating of electrically welded tubes in line of production
DE1558004C2 (de) * 1967-06-14 1974-07-11 Mannesmannroehren-Werke As, 4000 Duesseldorf Verfahren zur Wärmebehandlung von Schweißnähten
AT297449B (de) * 1970-07-14 1972-03-27 Simmering Graz Pauker Ag Verfahren zur Herstellung von Schweißnähten in einer Schutzgasatmosphäre mit vorzugsweise nicht abschmelzender Elektrode
BE793529A (nl) * 1971-12-30 1973-06-29 Rotterdamsche Droogdok Mij N V Werkwijze voor het rekristalliseren van een onder een opgelastelaag gelegen basismateriaal
DE3766507D1 (de) * 1986-01-21 1991-01-17 Siemens Ag Verfahren und vorrichtungen zur waermebehandlung von laengsnahtgeschweissten rohren.
DE3744044A1 (de) * 1987-12-24 1989-07-06 Schoeller Gmbh & Co Kg Verfahren zur waermebehandlung der schweissnaht an laengsgeschweissten metallrohren und vorrichtung zur durchfuehrung des verfahrens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2357099B1 (fr) * 2010-02-16 2017-07-12 Benteler Automobiltechnik GmbH Stabilisateur et procédé destiné à la fabrication d'un stabilisateur
DE102010044799A1 (de) * 2010-09-09 2012-04-26 Benteler Automobiltechnik Gmbh Stabilisator und Verfahren zum Herstellen eines Stabilisators
CN116689963A (zh) * 2023-06-25 2023-09-05 浙江摩多巴克斯科技股份有限公司 一种高强度钢管的激光焊接工艺
CN116689963B (zh) * 2023-06-25 2023-12-01 浙江摩多巴克斯科技股份有限公司 一种高强度钢管的激光焊接工艺

Also Published As

Publication number Publication date
ATE110116T1 (de) 1994-09-15
EP0394754B1 (fr) 1994-08-17
DE59006808D1 (de) 1994-09-22
EP0394754A3 (fr) 1992-10-14
ES2057241T3 (es) 1994-10-16
DE3913973A1 (de) 1990-10-31

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