DE749684C - Relieved weld seam - Google Patents

Relieved weld seam

Info

Publication number
DE749684C
DE749684C DER105586D DER0105586D DE749684C DE 749684 C DE749684 C DE 749684C DE R105586 D DER105586 D DE R105586D DE R0105586 D DER0105586 D DE R0105586D DE 749684 C DE749684 C DE 749684C
Authority
DE
Germany
Prior art keywords
weld seam
relieved
weld
corners
seam
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
Application number
DER105586D
Other languages
German (de)
Inventor
Albert Gsell
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.)
Rheinmetall AG
Original Assignee
Rheinmetall Borsig 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 Rheinmetall Borsig AG filed Critical Rheinmetall Borsig AG
Priority to DER105586D priority Critical patent/DE749684C/en
Application granted granted Critical
Publication of DE749684C publication Critical patent/DE749684C/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3061—Fixing blades to rotors; Blade roots ; Blade spacers by welding, brazing
    • 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
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/001—Turbines

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Description

Entlastete Schweißnaht Werden zwei oder mehrere Teile durch Schweißung miteinander verbunden, so entstehen an den Nahtenden oder -ecken infolge der - Schweißnahtschrumpfung übermäßige Spannungen, die die Gefahr des Einreißens der Naht mit sich bringen. Man hat sich zur Vermeidung dieses Übelstandes dadurch geholfen, daß die Werkstücke nach erfolgter Schweißung ausgeglüht wurden. In vielen Fällen ist jedoch ein Ausglühen nicht angängig, so z. B. dann, wenn- die durch die Schweißnahtschrumpfungen sich - ergebenden Spannungen als Haltekräfte nutzbar gemacht werden. Dies geschieht beispielsweise bei in den Radkörper von Kreiselmaschinen eingeschweißten Schaufein.Relieved weld seam Two or more parts are created by welding connected to one another, so arise at the seam ends or corners as a result of the - weld shrinkage excessive tension, which creates the risk of tearing the seam. One has helped to avoid this inconvenience by the fact that the workpieces were annealed after welding. In many cases, however, there is an annealing not accessible, so z. B. then when the weld shrinkage caused by the weld seam shrinkage - The resulting stresses can be used as holding forces. This happens for example with blades welded into the wheel center of gyroscopes.

Gemäß der Erfindung wird eine Entlastung der Schweißnaht dadurch bewirkt, daß die Schweiße an den der Kerbwirkung unterliegenden Nahtenden oder -ecken durch teilweises oder vollständiges Abtragen bis unterhalb der Werks.tückoberflächen mit .einem die Spannungsspitzen abbauenden Übergang versehen wird. Dieser Abbau erfolgt zweckmäßig unter Bildung von Winkeln über 9o°. Durch die Herabsetzung der vorhandenen Schrumpfspannungen an .den Nahtenden oder -ecken wird die Gefahr des Einreißens beseitigt, wodurch die Schweißung an Sicherheit gewinnt. Der Abbau der Schweißnähte an den in Frage kommenden Stellen kann in einfachster Weise durch Einsenken kalottenartiger oder ähnlicher Ausnehmungen erfolgen.According to the invention, relief of the weld seam is effected by that the welds through at the seam ends or corners subject to the notch effect partial or complete removal down to below the workpiece surfaces with .a transition that reduces the stress peaks is provided. This degradation takes place expediently with the formation of angles over 9o °. By reducing the existing Shrinkage stresses at the seam ends or corners increases the risk of tearing eliminated, making the weld safer. The breakdown of the welds at the points in question can be dome-like in the simplest way by countersinking or similar recesses.

Die Zeichnung zeigt in zwei Ausführungsbeispielen die Art der Entfernung der Schweiße an den Schweißnahtenden von in Turbinenlaufrädern eingeschweißten Schaufeln.The drawing shows the type of removal in two exemplary embodiments the weld at the weld ends of in Welded turbine runners Shovels.

Wie aus den Abbildungen ersichtlich ist, besitzen die Schaufelblätter a gleichförmig sich verjüngende Schaufelfüße b, die in entsprechende, quer zur Umlaufrichtung angeordnete Schlitze c eingesetzt und durch die Schweißnähte d mit dem Radkörper f verbunden sind. Die Schweiße wird an den -e-. fährlich.en Schw eißnahtenden beispielsweise durch Einfräsen kalottenartiger Ausnehrnungen lt (Abb. i) oder im Querschnitt kreisför- ' uriger Nuten i (Abb. 2) entfernt. Der hierdurch eintretende Spannungsabbau ist darauf zurückzuführen, daß die Kerbspannung am Schweißnahtende ganz oder teilweise aufgehoben wird, wodurch die auf die Naht wirkenden natürlichen Schrumpfkräfte nach dem Ende der Schweißnaht zu stetig abnehmen und bis auf Null herabgesetzt werden können.As can be seen from the figures, the blades have a uniformly tapering blade roots b, which are in the corresponding, transverse to the direction of rotation arranged slots c inserted and through the welds d with the wheel body f are connected. The sweat is on the -e-. Dangerous weld seams, for example by milling dome-like recesses according to (Fig. i) or in cross-section circular 'rustic grooves i (Fig. 2) removed. The resulting stress reduction is due to the fact that the notch stress at the end of the weld seam is wholly or partially is canceled, whereby the natural shrinkage forces acting on the seam after towards the end of the weld seam to decrease steadily and be reduced to zero can.

Claims (2)

PATENTANSPRÜCHE: i. Entlastete Schweißnaht, dadurch gekennzeichnet, daß die Schweiße an den der Kerbwirkung unterliegenden -Nalitendeii oder -ecken durch teilweise oder vollständige Abtragung bis unterhalb der Werkstückoberfläche mit einem die Spannungsspitzen abbauenden Übergang versehen wird. 2. Entlastete Schweißnaht nach Anspruch i, dadurch gekennzeichnet, daß die Entlastung durch Einsenken kalottenartiger oder ähnlicher Ausnehinungen ati den Schweißnahtenden oder -ecken erfolgt. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik ist ini Erteilungsverfahren folgende Druckschrift in Betracht gezogen worden deutsche Patentschrift 339.453, S. PATENT CLAIMS: i. Relieved weld seam, characterized in that the welds on the nalite parts or corners subject to the notch effect are provided with a transition which relieves the stress peaks by partial or complete removal down to below the workpiece surface. 2. Relieved weld seam according to claim i, characterized in that the relief takes place by sinking dome-like or similar recesses ati the weld seam ends or corners. To distinguish the subject of the application from the state of the art, the following publication was considered in the granting procedure: German Patent 339.453, p. 2. Zeile 30.2nd line 30.
DER105586D 1939-07-06 1939-07-06 Relieved weld seam Expired DE749684C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER105586D DE749684C (en) 1939-07-06 1939-07-06 Relieved weld seam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER105586D DE749684C (en) 1939-07-06 1939-07-06 Relieved weld seam

Publications (1)

Publication Number Publication Date
DE749684C true DE749684C (en) 1944-11-29

Family

ID=7421200

Family Applications (1)

Application Number Title Priority Date Filing Date
DER105586D Expired DE749684C (en) 1939-07-06 1939-07-06 Relieved weld seam

Country Status (1)

Country Link
DE (1) DE749684C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521664A1 (en) * 1985-06-18 1986-12-18 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau METHOD FOR FASTENING BLADES ON THE CIRCUMFERENCE OF THE ROTOR BODY OF A STEAM TURBINE
US4919040A (en) * 1988-12-12 1990-04-24 Sollami Phillip A Rotor vane and shaft assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339453C (en) * 1920-01-29 1921-07-25 Gustav Kuntze Process for increasing the strength of a weld seam on sheet metal produced from one side

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339453C (en) * 1920-01-29 1921-07-25 Gustav Kuntze Process for increasing the strength of a weld seam on sheet metal produced from one side

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521664A1 (en) * 1985-06-18 1986-12-18 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau METHOD FOR FASTENING BLADES ON THE CIRCUMFERENCE OF THE ROTOR BODY OF A STEAM TURBINE
US4919040A (en) * 1988-12-12 1990-04-24 Sollami Phillip A Rotor vane and shaft assembly

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