KR20090067434A - Apparatus for spot welding - Google Patents

Apparatus for spot welding Download PDF

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Publication number
KR20090067434A
KR20090067434A KR1020070135107A KR20070135107A KR20090067434A KR 20090067434 A KR20090067434 A KR 20090067434A KR 1020070135107 A KR1020070135107 A KR 1020070135107A KR 20070135107 A KR20070135107 A KR 20070135107A KR 20090067434 A KR20090067434 A KR 20090067434A
Authority
KR
South Korea
Prior art keywords
electrode
welding
spot welding
workpiece
welding tool
Prior art date
Application number
KR1020070135107A
Other languages
Korean (ko)
Inventor
천창근
Original Assignee
재단법인 포항산업과학연구원
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 재단법인 포항산업과학연구원 filed Critical 재단법인 포항산업과학연구원
Priority to KR1020070135107A priority Critical patent/KR20090067434A/en
Publication of KR20090067434A publication Critical patent/KR20090067434A/en

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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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
    • B23K20/125—Rotary tool drive mechanism
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
    • B23K20/126—Workpiece support, i.e. backing or clamping
    • 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
    • B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
    • B23K28/02—Combined welding or cutting procedures or apparatus
    • 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
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • B23K35/284—Mg as the principal constituent
    • 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
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • B23K35/286—Al as the principal constituent
    • 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
    • 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
    • B23K2101/006—Vehicles

Abstract

A spot welding apparatus is provided to improve performance of connection by making structure capable of applying a resistance point welding mode and a friction stir spot welding mode. A spot welding apparatus comprises the followings: a welding tool(11) contacting with a material to be processed; a first electrode(12) pressurizing the material, and made of a conductive material authorizing a current delivered from outside with a through-hole; and a second electrode separated from the first electrode, and located on a pressurization direction of the first electrode.

Description

Spot welding device {Apparatus for Spot Welding}

The present invention relates to a spot welding apparatus for joining overlapping workpieces, and more particularly, to a spot welding apparatus in which bonding performance is improved compared to the prior art even when the workpieces are bonded to each other.

Since lightweight alloys such as aluminum (Al) or magnesium (Mg) have excellent metal properties and are lightweight, their usage is increasing in transportation fields such as automobiles and airplanes. In addition to such nonferrous metals, recently, the use of high tensile strength steel sheets made thinner by increasing the strength of carbon steel is also increasing.

Since non-ferrous metals such as lightweight alloys have higher electrical and thermal conductivity than ordinary carbon steels, even if the workpieces are joined to each other by spot welding, spot welding is performed by friction stir method. On the other hand, workpieces made of carbon steel are generally joined together by resistance spot welding.

However, as mentioned above, the high tensile strength steel sheet is characterized in that an alloying element is added as compared with general carbon steel, and thus has high strength. As a result, the workpieces manufactured from the high tensile strength steel sheets have a problem in that the welded parts are easily broken when the materials are melted and solidified again when they are bonded to each other by resistance spot welding. In addition, the workpieces made of high-strength steel sheet, even when subjected to friction stir spot welding, not only requires an excessive load to generate frictional heat, but also a tool that generates frictional heat is easily worn.

The present invention has been proposed to solve the problems of the prior art as described above, and can be easily bonded to the workpieces of metal materials, such as high tensile strength steel sheets, which are difficult to apply resistance spot welding or friction stir welding. The purpose is to provide a spot welding apparatus.

The spot welding apparatus according to the embodiment of the present invention is configured to apply a current transmitted from the outside to the workpiece while a welding tool which is rotationally driven to frictionally contact the workpiece, and a through hole for accommodating the welding tool is formed. The first electrode is made of a conductive material and presses the workpiece, and a second electrode positioned on a line in the pressing direction of the first electrode and spaced apart from the first electrode by a predetermined distance.

The welding tool has a cylindrical shape, and the first electrode has a circular cross section in which the through hole corresponds to the circumferential surface of the welding tool.

The spot welding apparatus may include a driving unit for rotating the welding mold, a power supply unit applying current to the first electrode, a frame body supporting the driving unit and the power supply unit, and a second unit connected to the frame body. It further comprises a spaced frame for supporting the electrode is installed.

The spot welding apparatus according to the embodiment of the present invention proposes a structure that can be applied to the resistance spot welding method and the friction stir spot welding method, thereby joining the workpieces of the metal material, such as high tensile steel sheet. For this reason, the spot welding apparatus according to the embodiment of the present invention has an advantage in that the bonding performance is further improved as compared with the case where the workpieces of the metal material such as high tensile steel are bonded to each other by resistance spot welding. In addition, the spot welding apparatus according to the embodiment of the present invention does not require excessive load as compared with the case where the workpieces of the metal material such as high tensile steel are mutually bonded by friction stir spot welding, and the degree of wear of the tool due to frictional heat. There is also an advantage that is reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a perspective view schematically showing a point welding apparatus according to an embodiment of the present invention.

As shown in FIG. 1, in the spot welding apparatus according to the exemplary embodiment of the present invention, the resistance spot welding method and the friction stir spot welding method are applied to the first welding part 10 and the second welding part 20, respectively. It is formed as follows.

FIG. 2 is a perspective view illustrating a configuration relationship between a first welding unit and a second welding unit in the spot welding apparatus illustrated in FIG. 1, and FIG. 3 is an exploded perspective view illustrating a coupling relationship between components of the first welding unit illustrated in FIG. 2. .

As shown in Figs. 1 to 3, the first welding portion 10 includes a welding tool 11 which is rotationally driven to frictionally contact the workpiece. The welding tool 11 is a cylindrical shape having an end portion in contact with the workpiece, and is made of a non-consumable material having a relatively high hardness as compared with the workpiece.

The 1st welding part 10 is equipped with the 1st electrode 12 which connects a workpiece by applying an electric current to a workpiece. The first electrode 12 is formed with a through hole 13 for receiving the welding tool 11. The through hole 13 is formed in a circular cross section corresponding to the circumferential surface of the welding tool 11. In this case, the first welding part 10 is coated with a lubricant or a sliding bearing is installed on the inner surface of the through hole 13 so that the frictional force with the first electrode 12 is minimized even during the rotation of the welding tool 11. do.

The first electrode 12 is made of a material having excellent conductivity, such as copper. Then, the 1st electrode 12 can heat a to-be-processed material by applying the electric current transmitted from the exterior to a to-be-processed material in the state which pressed the to-be-processed material.

The second welding part 20 is positioned on the pressing direction line of the first electrode 12 as the second electrode, and is spaced apart from the first electrode 12 by a predetermined interval. The second electrode is made of the same conductive material as the first electrode 12, and serves to support the workpiece in a state in which the first electrode 12 presses the workpiece.

In addition, the spot welding device further includes actuating components 30 for actuating the first weld 10. That is, the spot welding apparatus is provided with the drive part which rotationally drives the welding die 11, and the power supply part which applies an electric current to the 1st electrode 12. FIG. The driving unit and the power supply unit are installed in the frame body 40. Then, the spaced frame 50 is connected to the frame body 40. The spaced frame 50 is a C-shaped frame, and a second welding portion 20 is provided at an end thereof. For this reason, the second welding part 20 may be maintained at a predetermined interval from the first welding part 10.

FIG. 4 is a perspective view illustrating a process in which the first welded part and the second welded part are joined to the workpieces shown in FIG. 2, and FIG. 5 is a first welded part and the second welded part shown in FIG. 4. It is a side view which shows a process.

As shown in Fig. 1, Fig. 4, and Fig. 5, the spot welding apparatus according to the embodiment of the present invention joins the workpieces 100 and 200 overlapped by the following steps.

In the spot welding apparatus, a portion to be joined between the workpieces 100 and 200 is placed between the first welding portion 10 and the second welding portion 20. The first welding portion 10 behaves by an operating component installed in the frame body 40, and contacts the surface of the workpiece 100. At this time, the first electrode 12 of the first welding part 10 softens the workpiece 100 using a current applied from the outside while pressing the workpiece 100 so as not to melt. Under such conditions, the welding tool 11 of the first welded part 10 is subjected to rotational friction on the surface of the workpiece 100, whereby the workpieces 100 and 200 are subjected to plastic flow and stirring of the workpieces 100 and 200. ) To each other.

That is, the preferred embodiments of the present invention have been described, but the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a perspective view schematically showing a point welding apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration relationship between a first welding part and a second welding part in the spot welding apparatus shown in FIG. 1.

3 is an exploded perspective view illustrating a coupling relationship between components of the first welding part illustrated in FIG. 2.

FIG. 4 is a perspective view illustrating a process in which the first welded part and the second welded part shown in FIG. 2 join the workpieces together.

FIG. 5 is a side view illustrating a process in which the first welded part and the second welded part shown in FIG. 4 join the workpieces together.

<Description of the symbols for the main parts of the drawings>

10: first welding part 11: welding tool

12: first electrode 20: second welding portion

100, 200: workpiece

Claims (3)

A welding tool rotationally driven to frictionally contact the workpiece; A first electrode formed of a conductive material to apply a current transmitted from the outside to the workpiece while the through-hole for accommodating the welding tool is formed and pressurizes the workpiece; And And a second electrode positioned on a line in the pressing direction of the first electrode and spaced apart from the first electrode by a predetermined interval. The method of claim 1, The welding tool has a cylindrical shape, and the first electrode is a spot welding device, characterized in that the through hole has a circular cross section corresponding to the circumferential surface of the welding tool. The method of claim 1, A drive unit for rotating the welding mold; A power supply unit applying a current to the first electrode; A frame body supporting the driving unit and the power supply unit to be installed; And a spaced frame connected to the frame body and supporting the second electrode to be installed.
KR1020070135107A 2007-12-21 2007-12-21 Apparatus for spot welding KR20090067434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070135107A KR20090067434A (en) 2007-12-21 2007-12-21 Apparatus for spot welding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070135107A KR20090067434A (en) 2007-12-21 2007-12-21 Apparatus for spot welding

Publications (1)

Publication Number Publication Date
KR20090067434A true KR20090067434A (en) 2009-06-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012026800A1 (en) * 2010-08-24 2012-03-01 Universiti Sains Malaysia A method for spot welding and an apparatus to perform the method
KR101331735B1 (en) * 2012-05-16 2013-11-20 진인태 Electric resistance heated friction stir welding
KR101443454B1 (en) * 2012-10-31 2014-09-24 현대제철 주식회사 Electrode unit and electric resistance spot welding machine having the same
WO2017217795A1 (en) * 2016-06-16 2017-12-21 한국생산기술연구원 Method and system for repairing pinhole resulting from friction stir welding
CN110653506A (en) * 2019-08-29 2020-01-07 山东碳垣纳米科技有限公司 Spot welding device and spot welding method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012026800A1 (en) * 2010-08-24 2012-03-01 Universiti Sains Malaysia A method for spot welding and an apparatus to perform the method
KR101331735B1 (en) * 2012-05-16 2013-11-20 진인태 Electric resistance heated friction stir welding
KR101443454B1 (en) * 2012-10-31 2014-09-24 현대제철 주식회사 Electrode unit and electric resistance spot welding machine having the same
WO2017217795A1 (en) * 2016-06-16 2017-12-21 한국생산기술연구원 Method and system for repairing pinhole resulting from friction stir welding
CN110653506A (en) * 2019-08-29 2020-01-07 山东碳垣纳米科技有限公司 Spot welding device and spot welding method
CN110653506B (en) * 2019-08-29 2021-08-20 山东碳垣纳米科技有限公司 Spot welding device and spot welding method

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