DE2119795A1 - Welding of austenitic steel tubes to a locating plate - Google Patents

Welding of austenitic steel tubes to a locating plate

Info

Publication number
DE2119795A1
DE2119795A1 DE19712119795 DE2119795A DE2119795A1 DE 2119795 A1 DE2119795 A1 DE 2119795A1 DE 19712119795 DE19712119795 DE 19712119795 DE 2119795 A DE2119795 A DE 2119795A DE 2119795 A1 DE2119795 A1 DE 2119795A1
Authority
DE
Germany
Prior art keywords
welding
austenitic
welded
plate
weld
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
Application number
DE19712119795
Other languages
German (de)
Inventor
Alfred James Wembley Middlesex; Boughton Peter Strinity Close Basham; Braithwaite Arthur Bevan Fulbourn Cambridgeshire Perrin (Großbritannien)
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.)
Deutsche Babcock and Wilcox AG
Original Assignee
Deutsche Babcock and Wilcox AG
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 Deutsche Babcock and Wilcox AG filed Critical Deutsche Babcock and Wilcox AG
Publication of DE2119795A1 publication Critical patent/DE2119795A1/en
Pending legal-status Critical Current

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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Arc Welding In General (AREA)

Abstract

The tubes may be used in the heat exchanger of a nuclear reactor and are welded to a plate or plates in the unit. the plate may also be of austenitic steel. To weld the tubes to the plate, a ring of weld containing ferrite is first applied. Tube and plate are then joined by friction or gas welding after which the ferrite ring is melted and the final weld achieved by arc welding.

Description

Schweißverbindung eines austenitisohen Rohres mit einer Rohrplatte Die Erfindung betrifft eine Schweißverbindung zwischen einem austenitischen Rohr und einer Rohrplatte eines Wärmeaustauschers. Welded connection of an austenitic pipe with a pipe plate The invention relates to a welded joint between an austenitic tube and a tube plate of a heat exchanger.

Bei einem Wärmeaustauscher, der z.B.-son dem neutralen Wasser des Primärkreislaufes eines Kernreaktors beaufschlagt wird, werden die Rohre aus anderen Gründen als aus Gründen der Hitze-oder Säurebeständigkeit aus austenitischem Stahl hergestellt und mit einer Rohrplatte durch eine austenitische Schweißnaht verschweißt.In the case of a heat exchanger, e.g. the neutral water of the Primary circuit of a nuclear reactor is acted upon, the tubes from others Reasons than for reasons of heat or acid resistance of austenitic steel manufactured and welded to a tube plate by an austenitic weld.

Es ist eine Schweißverbindung zwischen einem ferritischen und einem austenitischen Werkstück bekannt (deutsche Patentschrift 972 938), bei der das ferritische Werkstück mit einer Auftragsschweißung aus stabilisiertem Ferrit versehen ist, welche ihrer seits mit dem austenitischen Werkstück austenitisch verschweißt ist. Es ist auch bekannt (britische Patentschrift 706 015), an einem austenitischen Rohr eines berhitzerbündels ein kurzes ferritisches Rohr anzuschweißen, das mit einem ferritischen Sammler verschweißt ist. Bei jeder der Verbindungen ist eine Schweißnaht aus austenitischem Schweißgut vorgesehen.It is a welded joint between a ferritic and a Austenitic workpiece known (German Patent 972 938), in which the ferritic Workpiece is provided with a build-up weld made of stabilized ferrite, which on the other hand, is austenitically welded to the austenitic workpiece. It is also known (British patent specification 706 015), on an austenitic tube of a Superheater bundle a short ferritic tube to be welded with a ferritic Collector is welded. Each of the connections has an austenitic weld seam Weld deposit provided.

Ein austenitischer Zusatzwerkstoff läßt sich gut verschweißen und ergibt eine zähe und feste Schweißnaht. Es besteht die Meinung, daß arteigener Schweißzusatz am zweckmäßigsten für eine Schweißverbindung austenitischer Werkstücke ist. Das Gefüge der Schweißnaht ist jedoch von mikroskopischen Rissen durchsetzt.An austenitic filler material can be welded well and results in a tough and strong weld seam. There is an opinion that species-specific welding consumables is most appropriate for a welded joint of austenitic workpieces. That However, the structure of the weld seam is interspersed with microscopic cracks.

Durch die Mikrorisse ist die Schweißnaht nicht jeder mechanisehen Beanspruchung gewachsen, insbesondere nicht hohen Wechsel beanspruchungen. Infolge der Starrheit der Rohrplatte wird die Schweißnaht z.B. durch Schwingungen des Rohres durch Wechsel- Spannungen hoch beansprucht. Die Mikrorisse beschleunigen im Laufe der Betriebszeit die Zerstörung der Schweißnaht beträchtlich.Due to the micro-cracks, the weld seam is not always mechanical Cope with stress, especially not high alternating stresses. As a result Due to the rigidity of the tube plate, the weld seam is affected e.g. by vibrations in the tube by changing High stresses. Accelerate the micro-cracks In the course of the operating time, the destruction of the weld seam is considerable.

Der Erfindung liegt die Aufgabe zugrunde, die Bruchsicherheit der Schweißverbindung zwischen dem austenitischen Rohr und dem austenitischen Werkstoff der Rohrplatte zu verbessern und gleichzeitig bessere Bedlngungen zur Durchführung des chweißvorganges zu schaffen.The invention is based on the object of the break resistance Welded connection between the austenitic tube and the austenitic material to improve the tube plate and at the same time better conditions for implementation of the welding process.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Zusatzwerkstoff für die Schweißnaht an der Stirufläche des austenitischen Rohres in der Borm eines Ringes aufgeschweißt wird, der aus einoni ferrithaltigen Werkstoff besteht und der zur Bildung der Schweißnaht durch Lichtbogen unter Schutzgas aufgeschmolzen wird.According to the invention, this object is achieved in that the filler material for the weld seam on the front surface of the austenitic pipe in the Borm of a Ring is welded, which consists of einoni ferrite-containing material and the to form the weld seam is melted by an arc under protective gas.

Die Anreicherung der Schweißnaht mit Ferrit bewirkt, daß Mikrorisse in ihrem Gefüge vermiea-n we a, wodurch die Bruchsicher heit der Schweißnaht beträchtlich gesteigert wird. Gleichzeitig werden die Bedingungen für die Durchführung des Schweißvorganges in engen Raumverhältnissen verbessert, weil die Zuführung des Zusatzwerkstoffes entfällt und die Schweißnaht in einem Zuge durch einen Schweißautomaten hergestellt werden kann.The enrichment of the weld seam with ferrite causes micro-cracks vermiea-nwe a in their structure, which increases the break resistance of the weld seam considerably is increased. At the same time, the conditions for carrying out the welding process are established Improved in tight spaces because the feed of the filler material omitted and the weld is produced in one go by an automatic welding machine can be.

Claims (1)

PATENTANSPRUCH PATENT CLAIM Schweißverbindung zwischen einem Rohr mit hohem Austenitgehalt und dem austenitischen Werkstoff einer Rohrplatte, wobei der ringförmige Zusatzwerkstoff für die Schweißnaht am Ende des Rohres durch Reib- oder Auftrags schweißung befestigt sein kann und unter Schutzgas durch Lichtbogen verschweißt wird, dadurch g e k e n n z e i c h n e t , daß der an der Stirnseite des Rohres befindliche Zusatwerkstoff einen Anteil an Ferrit enthält und zur Nahtbildung vollständig aufgeschmolzen worden ist.Welded joint between a tube with a high austenite content and the austenitic material of a tube plate, the annular filler material attached for the weld seam at the end of the pipe by friction or build-up welding can be and is welded by arc under protective gas, thereby g e k e It is not stated that the additional material located on the end face of the pipe contains a proportion of ferrite and has been completely melted to form a seam is.
DE19712119795 1970-04-24 1971-04-23 Welding of austenitic steel tubes to a locating plate Pending DE2119795A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1969170 1970-04-24

Publications (1)

Publication Number Publication Date
DE2119795A1 true DE2119795A1 (en) 1971-11-04

Family

ID=10133593

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712119795 Pending DE2119795A1 (en) 1970-04-24 1971-04-23 Welding of austenitic steel tubes to a locating plate

Country Status (2)

Country Link
JP (1) JPS5442944B1 (en)
DE (1) DE2119795A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5497985A (en) * 1991-03-26 1996-03-12 Gaspar A. H. Byttebier Method and apparatus for temporarily storing and transporting successive textile sheets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5497985A (en) * 1991-03-26 1996-03-12 Gaspar A. H. Byttebier Method and apparatus for temporarily storing and transporting successive textile sheets

Also Published As

Publication number Publication date
JPS5442944B1 (en) 1979-12-17

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