WO2009030099A1 - Connecteur de canalisation en cu-al résistant à la flexion, procédé de production et barre centrale spéciale - Google Patents

Connecteur de canalisation en cu-al résistant à la flexion, procédé de production et barre centrale spéciale Download PDF

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Publication number
WO2009030099A1
WO2009030099A1 PCT/CN2008/001389 CN2008001389W WO2009030099A1 WO 2009030099 A1 WO2009030099 A1 WO 2009030099A1 CN 2008001389 W CN2008001389 W CN 2008001389W WO 2009030099 A1 WO2009030099 A1 WO 2009030099A1
Authority
WO
WIPO (PCT)
Prior art keywords
copper
aluminum
tube
pipe
welding
Prior art date
Application number
PCT/CN2008/001389
Other languages
English (en)
Chinese (zh)
Inventor
Tiejun Zuo
Yue Zhao
Original Assignee
Tiejun Zuo
Yue Zhao
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 Tiejun Zuo, Yue Zhao filed Critical Tiejun Zuo
Publication of WO2009030099A1 publication Critical patent/WO2009030099A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0218—Welded joints having an inner or outer ring
    • F16L13/0236—Welded joints having an inner or outer ring having an outer ring

Definitions

  • the invention relates to a dissimilar metal welded joint, in particular a copper-aluminum welded joint.
  • the invention also relates to a method of preparing the above welded joint and a dedicated mandrel. Background technique
  • the melting point of copper tube and aluminum tube is about 400 °C, and because the inner surface of aluminum tube is covered with oxide layer, especially in the welding of thin-wall copper-aluminum tube, it is difficult for two materials to realize direct chemical bond between two metal atoms.
  • a copper-aluminum eutectic transition layer is produced between the copper and aluminum materials.
  • the eutectic structure referred to in the present specification means a copper-aluminum eutectic alloy formed of a copper-aluminum metal compound and aluminum at a high temperature.
  • the socket joint inserted into the aluminum tube is suitable for welding thin-walled copper-aluminum tubes. It is welded by high-frequency welding and brazing. Due to unfavorable factors such as reactive pores, copper-aluminum eutectic structure and potential corrosion hazards, It is difficult to realize the mass-bonding of copper-aluminum chemical bonds.
  • the resistance-pressure composite welding method can overcome the above problems, but the bending resistance of copper-aluminum joints is slightly insufficient, that is, the aluminum tube side is easily broken after the joint is bent more than 45 degrees. These technical defects have hindered the application of aluminum tubes in the refrigeration industry. Summary of the invention The technical problem to be solved by the present invention is to provide a copper-aluminum pipe joint which is resistant to bending, so that the joint does not crack and leak when the joint is bent at 90 degrees.
  • Another technical problem to be solved by the present invention is to provide a method of producing the aforementioned copper-aluminum pipe joint and a special mandrel.
  • the welded joint portion of the copper pipe has a tapered welded surface with a straight tubular guide portion, and the outer diameter of the guide portion is slightly smaller than the inner diameter of the aluminum pipe.
  • the length of the copper tube guide inserted into the aluminum tube shall be such that the position of the top end after welding exceeds the high temperature plastic deformation area of the aluminum tube side in the welded joint.
  • the aluminum pipe is the high temperature plastic deformation zone.
  • the inner surface of the guide portion has an evenly distributed slit in the axial direction. The rips can be indentations, scratches, or can be pressed through to penetrate the guide tube wall.
  • the elongated guide end extends beyond the high-temperature plastic deformation region, thereby avoiding the poor performance of the aluminum pipe region, and the elongated guide tip is topped in plasticity.
  • the copper pipe conical welding surface forms a direct chemical bond connection with the inner wall of the aluminum pipe, and there is no copper-aluminum eutectic structure in the weld seam. Therefore, when the copper-aluminum pipe joint is subjected to the tension, the crack of the guide portion can be expanded, but there is no common The copper-aluminum weld zone of the crystal structure does not crack.
  • the eutectic structure referred to in the present specification means a low melting point eutectic alloy formed of a copper aluminum metal compound and aluminum at a high temperature.
  • the mandrel is a multi-stage bead type
  • the front end is a trimming portion having a ring-shaped hoop type protrusion, followed by The groove portion of the pointed projection is followed by the flared portion of the annular hoop type projection.
  • the above problem is solved as follows: one copper pipe and one aluminum pipe are taken, and one end of the copper pipe is closed, and the length of the guiding portion at the closing point exceeds the high temperature plastic deformation of the aluminum pipe. region.
  • the mandrel is placed in the copper tube from the direction of the copper tube and connected to the thrust link of the welder. Place the copper tube with the welded mandrel in the moving electrode group, fix the copper tube with the high pressure cylinder, place the aluminum tube in the fixed electrode and fix the aluminum tube, and install the high heat resistance at the welding position of the fixed electrode aluminum tube.
  • the shape of the cavity of the mosaic block is consistent with the shape of the aluminum tube.
  • the end of the aluminum tube is flush with the edge of the insert, and the push cylinder will have a copper tube.
  • the moving electrode group is pushed to the aluminum tube, and the pressure is controlled in the range of 250kg ⁇ 550kg.
  • the electric resistance is applied to the copper-aluminum bonding zone for resistance heating, and the copper tube continuously moves to the inside of the aluminum tube under the action of the pushing cylinder, during the moving process.
  • the propulsion pressure and welding current of the copper pipe automatically adjust the current, voltage, air pressure and other parameters to control the temperature of the copper-aluminum weld.
  • the mandrel preset inside the copper tube is pushed along the copper tube toward the aluminum tube under the push of the welding equipment.
  • the inner hole of the welded joint is trimmed by the trimming portion of the mandrel, the groove portion presses the inner wall of the copper pipe guide portion out of the obvious groove, the flared portion enlarges the inner diameter of the guide portion, and the outer diameter of the guide portion is attached to the aluminum pipe On the inner wall, thereby increasing the flow level inside the pipe.
  • the stress concentration factor is artificially increased. Therefore, several cracks appear in the guide portion after the diameter expansion, thereby weakening the resistance of the guide portion to the bending of the aluminum tube, and reducing the subsequent use. The risk of the welded joint aluminum tube being bent.
  • the specially treated copper tube guide can prevent the aluminum tube from cracking caused by the joint bending during use;
  • the preset mandrel at the closing end of the copper pipe welding portion has two functions, and a deep groove is pressed on the inner wall of the guiding portion, and the copper-aluminum joint after welding is expanded.
  • the junction region While cleaning the aluminum tube oxide, the junction region is electrically resistively heated, and heated while being pressurized, reducing the amount of copper-aluminum eutectic structure generated, preventing deformation of the copper tube, and the resulting copper-aluminum eutectic structure is also between copper and aluminum. High pressure extrusion improves the overall performance of the joint;
  • the aluminum tube at the joint forms a remelted aluminum metal on the outer surface of the copper tube under the combined action of high pressure and electric resistance heat, and forms a welded joint structure of the plugged copper and aluminum tube with a large fusion area;
  • the groove step which is processed to increase the stress concentration factor of the guide portion may be pressed through the guide tube wall or may be completed before the welding assembly.
  • the copper tube can be made of copper tube
  • the aluminum tube can be made of pure aluminum tube or rustproof aluminum tube.
  • Figure 1 is a bending-resistant copper-aluminum pipe joint diagram
  • Figure 2 is a schematic diagram of the assembly of the anti-bending copper-aluminum pipe joint before welding.
  • Figure 3 is a schematic diagram of the welding end of the anti-bending copper-aluminum pipe joint
  • FIG. 4 is a schematic diagram of copper tube processing
  • Thrust link 1 mandrel 2, copper tube 3, moving electrode 4, flared portion 5, grooved portion 6, trim portion 7, tapered welded surface 8, guide portion 9, fixed electrode 10, insert block 1.1, aluminum Tube 12, crack 13 Detailed embodiment 1
  • the copper pipe and the aluminum pipe with the same outer diameter of the pipe are selected for preliminary processing, and the short copper pipe 3 and the aluminum pipe 12 are obtained.
  • the welded portion of the copper tube 3 tube end is processed into a reduced diameter shape at the front end of the guide portion 9.
  • the outer diameter of the guide portion 9 should be slightly smaller than the inner diameter of the aluminum tube 12. The diameter and wall thickness of the end face to be welded of the aluminum tube 12 remain unchanged.
  • a mandrel 2 is placed in advance on the inside of the copper tube 3, and the copper tube 3 with the mandrel 2 is placed on the moving electrode 4 of the resistance pressure welding machine, and the core rod 2 is connected to the axial thrust link 1;
  • the tube 12 port is not further processed, and the wall thickness and diameter are maintained as they are placed on the fixed electrode 10 of the resistance pressure welding machine.
  • a hard ceramic insert 11 is embedded in the fixed electrode 10 to lower the thermal conductivity, increase the resistivity, and regulate the flow path of the welding current.
  • the moving electrode 4 and the copper tube 3 on its electrode are horizontally moved into the aluminum tube 12 by a resistance pressure welding machine.
  • the tapered welding surface 8 grinds off the oxide layer on the inner wall of the soft aluminum tube 12, and energizes the moving electrode 4 and the fixed electrode 10, and the aluminum tube 12 is welded under the action of resistance heat.
  • the surface melts rapidly, and the internally melted aluminum liquid is filled between the aluminum tube 12 and the guide portion 9, until the tapered welding surface 8 is wrapped into the aluminum tube 12, the welding power source is disconnected, the thrust link 1 is actuated, and the mandrel is quickly moved. Pushing the direction of the aluminum tube, first, the guide portion 9 is trimmed and flanked by the trimming portion 7 on the mandrel 2, and the guide portion 9 in which the rounding deformation has occurred during the welding process is trimmed.
  • the copper tube and the aluminum tube with the same outer diameter of the tube are selected for preliminary processing, and the short copper tube 3 and the aluminum tube 12 are obtained.
  • the welded portion of the copper tube 3 tube end is processed into a front end having a guide portion 9
  • the slot can also be cut or cut through to penetrate the guide tube wall.

Landscapes

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

Abstract

La présente invention concerne un connecteur de soudage de canalisation en Cu-Al qui comporte un guide de canalisation droit (9) et une surface de soudage adhésive (8) positionnés sur le connecteur de soudage de canalisation en Cu (3). Le diamètre extérieur du guide (9) est légèrement inférieur au diamètre interne de la canalisation en Al (12), et la longueur du guide (9) de la canalisation en Cu (3) est plus longue que la surface se déformant plastiquement à température élevée de la canalisation en Al (12). Des cannelures (13) sont disposées selon une direction axiale sur la surface interne du guide (9), et peuvent prévenir la formation de fissures dans la canalisation en Al (12). L'invention concerne un procédé de production dudit connecteur de canalisation en Cu-Al et une barre centrale (2) utilisée dans le présent procédé.
PCT/CN2008/001389 2007-09-05 2008-07-29 Connecteur de canalisation en cu-al résistant à la flexion, procédé de production et barre centrale spéciale WO2009030099A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2007101457565A CN101382216B (zh) 2007-09-05 2007-09-05 一种抗弯曲的铜铝管接头、其制备方法及专用芯棒
CN200710145756.5 2007-09-05

Publications (1)

Publication Number Publication Date
WO2009030099A1 true WO2009030099A1 (fr) 2009-03-12

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Application Number Title Priority Date Filing Date
PCT/CN2008/001389 WO2009030099A1 (fr) 2007-09-05 2008-07-29 Connecteur de canalisation en cu-al résistant à la flexion, procédé de production et barre centrale spéciale

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CN (1) CN101382216B (fr)
WO (1) WO2009030099A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103343847A (zh) * 2013-07-09 2013-10-09 扬州红人实业有限公司 铜铝管及其焊接工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103363243B (zh) * 2013-08-07 2015-07-22 重庆望江工业有限公司 一种阴阳线内管修整装置
CN107775167A (zh) * 2016-08-24 2018-03-09 浙江康盛股份有限公司 一种铜铝管热阻复合连接方法
CN106425067A (zh) * 2016-10-14 2017-02-22 合肥太通制冷科技有限公司 一种带芯棒的电阻对焊机模具
JP6928804B2 (ja) * 2018-09-14 2021-09-01 奥村金属株式会社 銅管とアルミニウム管の接合体およびその接合方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001057A1 (fr) * 1995-06-20 1997-01-09 Nauchno-Issledovatelsky I Konstruktorsky Institut Energotekhniki Raccord pour la soudure de tubes en acier inoxydable a des tubes en alliages de zirconium
CN1299038C (zh) * 2005-02-24 2007-02-07 左铁军 制冷系统用铜铝组合管路及其制备方法
CN1959171A (zh) * 2006-09-20 2007-05-09 左铁军 无共晶组织的薄壁铜铝管焊接接头及其制备方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5549335A (en) * 1994-04-06 1996-08-27 Peerless Of America, Incorporated Solderless metallurgical joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997001057A1 (fr) * 1995-06-20 1997-01-09 Nauchno-Issledovatelsky I Konstruktorsky Institut Energotekhniki Raccord pour la soudure de tubes en acier inoxydable a des tubes en alliages de zirconium
CN1299038C (zh) * 2005-02-24 2007-02-07 左铁军 制冷系统用铜铝组合管路及其制备方法
CN1959171A (zh) * 2006-09-20 2007-05-09 左铁军 无共晶组织的薄壁铜铝管焊接接头及其制备方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103343847A (zh) * 2013-07-09 2013-10-09 扬州红人实业有限公司 铜铝管及其焊接工艺

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CN101382216A (zh) 2009-03-11
CN101382216B (zh) 2010-08-11

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