CA1277718C - High speed rotary arc welding apparatus - Google Patents
High speed rotary arc welding apparatusInfo
- Publication number
- CA1277718C CA1277718C CA000536433A CA536433A CA1277718C CA 1277718 C CA1277718 C CA 1277718C CA 000536433 A CA000536433 A CA 000536433A CA 536433 A CA536433 A CA 536433A CA 1277718 C CA1277718 C CA 1277718C
- Authority
- CA
- Canada
- Prior art keywords
- electrode
- rotative
- welding device
- arc welding
- gear
- 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 - Lifetime
Links
Landscapes
- Arc Welding In General (AREA)
Abstract
ABSTRACT
A rotative arc welding device wherein the arc produced from an electrode is caused to perform a rotative circular movement. An electrode (20) is supported for free rotation with an offset of a predetermined distance (d) from the center of a disk (25) performing a rotative movement. The disk is driven into rotation with the upper portion of the electrode as the supporting point.
A rotative arc welding device wherein the arc produced from an electrode is caused to perform a rotative circular movement. An electrode (20) is supported for free rotation with an offset of a predetermined distance (d) from the center of a disk (25) performing a rotative movement. The disk is driven into rotation with the upper portion of the electrode as the supporting point.
Description
~ ;~77718 S P E C I F I C A T I O N
High-Speed Rotative Arc Welding Device Technical Field This invention relates to a high-speed transfer arc welding device for performing a welding operation while causing a high-speed rotation of the welding arc.
BACKGROUND ART
The present inventors have proposed a rotative arc weLding device tJapanese laid-Open Publ;cation No. 58-176073) which has given rise tOmany useful results by application to a narrow-groove weld;ng. According to this welding device, the high-speed rotation of the welding arc promotes penetration at the side wall of the groove while also producing a concave bead shape suitable for multi-layer welding. The result is the significantly improved quality of the narrow groove welding. This welding device is hereafter referred to as the conventional welding dev;ce.
This conventional welding device has a vertically oriented rotary nozzle to the end of which is attached a tip having a w;re supply opening offset from the axis outwardly, a power receiving plate secured to the upper end of the rotary nozzle and hav;ng a center w;re ;nsert;ng opening, a carbon brush the lower surface of which slides on the upper surface of said power receiving plate, a power supply plate secured to the upper surface of sa;d carbon brush, and a w;re inlet the lower end of which is passed through sa;d power supply plate and sa;d carbon brush so ~ .~77718 as to face to the upper surface of the wire inserting opening in said ~power receiving plate and having a wire insertion opening at the center attached to a supporting arm in turn extended from the main body of the device. The conventional welding device further includes a guide rod, the lower end of which is suspendedly mounted to said supporting arm is fitted into guide apertures in the power supply plate and in the carbon brush, a resilient member for pressing towards the power receiving plate the carbon brush which is fitted to the periphery of the guide rod and carrying the power supply plate, a wire feeder for feeding the welding wire through the wire inlet to the rotary nozzle, and a pair of shield gas nozzles provided on both sides of the rotative nozzle with its open side directing tcwards the end of the rotative nozzle.
sp'.` ~
~ ~77~18 The above described welding device makes use of the carbon brush for power supply since the electrode itself is rotated. Thus the contact area for the carbon brush must be procured for assuring a current supply capacity, while the rotative contact resistance of the carbon brush need be considered, so that the current supply section or the electrical motor is necessarily increased in size.
This, however, has proved to be a hindrance when it is required to reduce the size of the welding device.
Disclosure of the Invention It is an object of the present invention to provide a high speed rotative arc welding device in which the rotative system for the electrode is improved in order to provide for reduction in size and weight without sacrificing the advantages of the prior-art welding device .
According to the high-speed rotative arc welding device of the present invention, the electrode is rotatively supported with an offset of a predetermined distance from the center of a disk per-forming a rotative movement, and the disk is driven into rotation with the upper portion of the electrode as the supporting point, so that the arc emitted by the electrode is caused to perform a rotative circular movement.
In such manner, in accordance with the present invention, the electrode itself is not rotated when the lower end o the elec-trode performs a circular movement. It is therefore possible to sup-ply the power directly to the electrode.
"~, spl;
~.Z7771.~
1 Therefore, with the h;gh-speed rotative arc welding device of the present invention, as compared with the conventional rotative arc welding device, the following outstanding results may be achieved.
(a) In the conventional welding device, the space for the supply section is increased, because the power supply is through a contact power supply system with the aid of a carbon brush. On the other hand, a large-sized rotating 1û electrical motor is required because of the contact resistance of the carbon brush.
Conversely, in the welding device of the present invention, since the power càn be supplied directly to the electrode nozzle, the space necessary for the power supply section is cons;derably reduced. Also, since there is no contact resistance of the carbon brush, a small-sized electric motor can be used more extensively than heretofore so that the welding device may be significantly reduced in size and weight.
(b) In the conventional welding device, the electrode itself is driven into rotation. In the welding device of the present invention, it is only the lower end of the electrode nozzle that performs a rotative movement, while the electrode nozzle ;tself is not rotated. In such manner, the electrode nozzle can be cooled with water easily, while it becomes possible to make a more extensive application of the present welding device.
12777~ ~3 ~rie~f Descr;ption of the Drawings F;gs. 1(A) and (B) are a cross-sect;onal s;de view showing a rotative arc welding dev;ce according to a preferred embodiment of the present invention, and a plan 5 v;ew of a gear sect;on for transm;tting rotative movement to the lower end of the electrode~
10 ~est Mode for Work;ng the Invent;on A preferred embod;ment of the present ;nvention will be described by referring to the drawings.
Figs. 1(A) and (~) are cross-sect;onal s;de views of a rotat;onal arc weld;ng dev;ce accord;ng to a pre-ferred 15 embodiment of the present ;nvent;on and a plan v;ew show;ng a gear;ng unit for impart;ng a rotative motion to the electrode.
Referr;ng to F;g. 1, the numeral 20 denotes an electrode, the numeral 21 a welding wire, the numeral 22 20 a rotary electr;c motor, the numeral 23 a shaft of the motor 22, and the numeral Z4 a gear secured to the shaft 23 and excited into a h;gh-speed rotation by the motor 22, and the numeral Z5 a gear excited into a high-speed rotation by the gear 24. The numeral 26 denotes a self-25 aligning bear;ng adapted for support;ng the electrode 21and attached to the gear 25 with an offset of a predetermined distance d from the center of the gear Z5 so that the electrode 21 will be rotated at an elevated speed by rotat;on of the gear 25. The numeral 27 denotes ~77718 1 a self-aligning bearing acting as a supporting point for the rotating electrode 21. The numeral 28 denotes a gear box attached to a rack of a weld;ng dolly, not shown.
The numeral 29 denotes a pouer supply cable for supplying an electrical power to the electrode. The numeral 30 denotes a welding arc, the numeral 31 a work to be welded and the numeral 32 an adjustment unit for adjusting the rotative diameter. The numeral 33 denotes an attachment opening for a power supply cable terminal and the numeral 34 a bearing for supporting the gear 25.
The lower end of the electrode 21 is excited into a rotative movement through the gear 24 by the motor 22 with the self-al;gning bearing 27 as a support point. In this manner, the weld;ng arc 30 and the foremost part of the welding wire 21 supplied at the lower extremity of the electrode 2û perform a rotative circular motion on the work 31. The diameter of rotation D at the end ofthe rotating welding wire 21 may be adjusted by changing the distance l at the adjustment unit 32. Since the electrode 2û itself is not turned when the lower end of the electrode 2û
performs a rotative movement, it is possible to supply the current directly to the electrode Z0 through the feeder 29 as shown.
It will be noted that Figs. 1(A~ and (B) merely illustrate a preferred embodiment of the present invention without limiting the present invention to such specific embodiment. For example, the self-aligning bearing 27 used as the fulcrum or supporting point for the electrode 20 may be replaced by a spherical bearing since the movement of ~ .Z7771fl 1 the portion of the electrode 20 is small. Also it is to be noted that any other transmission system than the gear shown in the above embodiment may be used as the transmission systetn from the motor 22 to the gear 25. The welding method to which the present invention is applied is the welding method as a whole.
High-Speed Rotative Arc Welding Device Technical Field This invention relates to a high-speed transfer arc welding device for performing a welding operation while causing a high-speed rotation of the welding arc.
BACKGROUND ART
The present inventors have proposed a rotative arc weLding device tJapanese laid-Open Publ;cation No. 58-176073) which has given rise tOmany useful results by application to a narrow-groove weld;ng. According to this welding device, the high-speed rotation of the welding arc promotes penetration at the side wall of the groove while also producing a concave bead shape suitable for multi-layer welding. The result is the significantly improved quality of the narrow groove welding. This welding device is hereafter referred to as the conventional welding dev;ce.
This conventional welding device has a vertically oriented rotary nozzle to the end of which is attached a tip having a w;re supply opening offset from the axis outwardly, a power receiving plate secured to the upper end of the rotary nozzle and hav;ng a center w;re ;nsert;ng opening, a carbon brush the lower surface of which slides on the upper surface of said power receiving plate, a power supply plate secured to the upper surface of sa;d carbon brush, and a w;re inlet the lower end of which is passed through sa;d power supply plate and sa;d carbon brush so ~ .~77718 as to face to the upper surface of the wire inserting opening in said ~power receiving plate and having a wire insertion opening at the center attached to a supporting arm in turn extended from the main body of the device. The conventional welding device further includes a guide rod, the lower end of which is suspendedly mounted to said supporting arm is fitted into guide apertures in the power supply plate and in the carbon brush, a resilient member for pressing towards the power receiving plate the carbon brush which is fitted to the periphery of the guide rod and carrying the power supply plate, a wire feeder for feeding the welding wire through the wire inlet to the rotary nozzle, and a pair of shield gas nozzles provided on both sides of the rotative nozzle with its open side directing tcwards the end of the rotative nozzle.
sp'.` ~
~ ~77~18 The above described welding device makes use of the carbon brush for power supply since the electrode itself is rotated. Thus the contact area for the carbon brush must be procured for assuring a current supply capacity, while the rotative contact resistance of the carbon brush need be considered, so that the current supply section or the electrical motor is necessarily increased in size.
This, however, has proved to be a hindrance when it is required to reduce the size of the welding device.
Disclosure of the Invention It is an object of the present invention to provide a high speed rotative arc welding device in which the rotative system for the electrode is improved in order to provide for reduction in size and weight without sacrificing the advantages of the prior-art welding device .
According to the high-speed rotative arc welding device of the present invention, the electrode is rotatively supported with an offset of a predetermined distance from the center of a disk per-forming a rotative movement, and the disk is driven into rotation with the upper portion of the electrode as the supporting point, so that the arc emitted by the electrode is caused to perform a rotative circular movement.
In such manner, in accordance with the present invention, the electrode itself is not rotated when the lower end o the elec-trode performs a circular movement. It is therefore possible to sup-ply the power directly to the electrode.
"~, spl;
~.Z7771.~
1 Therefore, with the h;gh-speed rotative arc welding device of the present invention, as compared with the conventional rotative arc welding device, the following outstanding results may be achieved.
(a) In the conventional welding device, the space for the supply section is increased, because the power supply is through a contact power supply system with the aid of a carbon brush. On the other hand, a large-sized rotating 1û electrical motor is required because of the contact resistance of the carbon brush.
Conversely, in the welding device of the present invention, since the power càn be supplied directly to the electrode nozzle, the space necessary for the power supply section is cons;derably reduced. Also, since there is no contact resistance of the carbon brush, a small-sized electric motor can be used more extensively than heretofore so that the welding device may be significantly reduced in size and weight.
(b) In the conventional welding device, the electrode itself is driven into rotation. In the welding device of the present invention, it is only the lower end of the electrode nozzle that performs a rotative movement, while the electrode nozzle ;tself is not rotated. In such manner, the electrode nozzle can be cooled with water easily, while it becomes possible to make a more extensive application of the present welding device.
12777~ ~3 ~rie~f Descr;ption of the Drawings F;gs. 1(A) and (B) are a cross-sect;onal s;de view showing a rotative arc welding dev;ce according to a preferred embodiment of the present invention, and a plan 5 v;ew of a gear sect;on for transm;tting rotative movement to the lower end of the electrode~
10 ~est Mode for Work;ng the Invent;on A preferred embod;ment of the present ;nvention will be described by referring to the drawings.
Figs. 1(A) and (~) are cross-sect;onal s;de views of a rotat;onal arc weld;ng dev;ce accord;ng to a pre-ferred 15 embodiment of the present ;nvent;on and a plan v;ew show;ng a gear;ng unit for impart;ng a rotative motion to the electrode.
Referr;ng to F;g. 1, the numeral 20 denotes an electrode, the numeral 21 a welding wire, the numeral 22 20 a rotary electr;c motor, the numeral 23 a shaft of the motor 22, and the numeral Z4 a gear secured to the shaft 23 and excited into a h;gh-speed rotation by the motor 22, and the numeral Z5 a gear excited into a high-speed rotation by the gear 24. The numeral 26 denotes a self-25 aligning bear;ng adapted for support;ng the electrode 21and attached to the gear 25 with an offset of a predetermined distance d from the center of the gear Z5 so that the electrode 21 will be rotated at an elevated speed by rotat;on of the gear 25. The numeral 27 denotes ~77718 1 a self-aligning bearing acting as a supporting point for the rotating electrode 21. The numeral 28 denotes a gear box attached to a rack of a weld;ng dolly, not shown.
The numeral 29 denotes a pouer supply cable for supplying an electrical power to the electrode. The numeral 30 denotes a welding arc, the numeral 31 a work to be welded and the numeral 32 an adjustment unit for adjusting the rotative diameter. The numeral 33 denotes an attachment opening for a power supply cable terminal and the numeral 34 a bearing for supporting the gear 25.
The lower end of the electrode 21 is excited into a rotative movement through the gear 24 by the motor 22 with the self-al;gning bearing 27 as a support point. In this manner, the weld;ng arc 30 and the foremost part of the welding wire 21 supplied at the lower extremity of the electrode 2û perform a rotative circular motion on the work 31. The diameter of rotation D at the end ofthe rotating welding wire 21 may be adjusted by changing the distance l at the adjustment unit 32. Since the electrode 2û itself is not turned when the lower end of the electrode 2û
performs a rotative movement, it is possible to supply the current directly to the electrode Z0 through the feeder 29 as shown.
It will be noted that Figs. 1(A~ and (B) merely illustrate a preferred embodiment of the present invention without limiting the present invention to such specific embodiment. For example, the self-aligning bearing 27 used as the fulcrum or supporting point for the electrode 20 may be replaced by a spherical bearing since the movement of ~ .Z7771fl 1 the portion of the electrode 20 is small. Also it is to be noted that any other transmission system than the gear shown in the above embodiment may be used as the transmission systetn from the motor 22 to the gear 25. The welding method to which the present invention is applied is the welding method as a whole.
Claims (4)
1. A rotative arc welding device characterized in that an electrode is rotatively supported with an offset of a predetermined distance from the center of a disk performing a rotative movement and in that said disk is driven into rotation with the upper portion of said electrode as the supporting point whereby to cause a rotative circular motion of an arc evolved from said electrode.
2. A rotative arc welding device according to Claim 1 wherein the upper portion of the electrode is supported by the self-aligning bearing.
3. A rotative arc welding device according to Claim 1 wherein the upper portion of the electrode is supported by a spherical bearing.
4. A rotative arc welding device according to Claim 1 wherein the vicinity of the center portion of the electrode is supported by a self-aligning bearing and said self-aligning bearing is mounted to the rotatively driven gear with an offset of a predetermined distance from the center of said gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000536433A CA1277718C (en) | 1987-05-05 | 1987-05-05 | High speed rotary arc welding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000536433A CA1277718C (en) | 1987-05-05 | 1987-05-05 | High speed rotary arc welding apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1277718C true CA1277718C (en) | 1990-12-11 |
Family
ID=4135590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000536433A Expired - Lifetime CA1277718C (en) | 1987-05-05 | 1987-05-05 | High speed rotary arc welding apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1277718C (en) |
-
1987
- 1987-05-05 CA CA000536433A patent/CA1277718C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |