CN201223993Y - Welding gun for narrow cap gas-shield metal arc welding - Google Patents
Welding gun for narrow cap gas-shield metal arc welding Download PDFInfo
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- CN201223993Y CN201223993Y CNU2008200296674U CN200820029667U CN201223993Y CN 201223993 Y CN201223993 Y CN 201223993Y CN U2008200296674 U CNU2008200296674 U CN U2008200296674U CN 200820029667 U CN200820029667 U CN 200820029667U CN 201223993 Y CN201223993 Y CN 201223993Y
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- matching layer
- cooled
- piezoelectric chip
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Abstract
The utility model discloses a narrow-gap fusion electrode gas-shield welding torch, comprising a torch body, a water cooling body, a conductive mouth, a wiring seat and a gas sieve; the utility model is characterized in that the welding torch also comprises piezoelectric wafers and a matching layer located in a protective gas chamber; the internal diameter of the piezoelectric wafers and that of the matching layer are the same as the external diameter of the water cooling body; the external diameter of the piezoelectric wafers and that of the matching layer are the same as the internal diameter of the torch body; the piezoelectric wafers are stacked on the matching layer and located on a lug boss at the external circle of the water cooling body and tightly pressed and fixed through a retaining ring; and the upper and lower surfaces of the piezoelectric wafers are electrically connected with a high-frequency oscillator through wires. With the addition of a piezoelectric wafer, the piezoelectric wafers can continuously emit ultrasonic beams under the effect of the high-frequency oscillator in the welding process to cause ultrasonic vibration of liquid metal so as to change the metal surface tension of the liquid molten pool and enhance the liquid metal fluidity and the ability of breaking oxide films, so that the liquid metal of the molten pool can be fully fused with the metal at the sidewall of the groove of the welding piece to eliminate incomplete fusion at the sidewall.
Description
Technical field
The present invention relates to a kind of welding gun, particularly a kind of welding gun for narrow cap gas-shield metal arc welding.
Background technology
The narrow cap gas-shield metal arc welding welding method is a kind of welding method of welding slab or ultra-thick plate that twentieth century grows up the seventies, uses comparatively extensive.But find that in use for many years this welding method is easy to generate sidewall incomplete fusion defective.This defective butt joint quality has significant impact, can cause the fracture of whole joint when serious, and the sidewall incomplete fusion defective loss of big thickness steel plate is higher, in use has certain potential safety hazard.
With reference to Fig. 2, known welding gun for narrow cap gas-shield metal arc welding comprises rifle body 7, water-cooled body 15, ignition tip 17, junction block 22 and air sifter 19.Be fixed with water-cooled body 15 in the center of rifle body 7; the top of rifle body 7 is fixed with junction block 22; it between rifle body 7 and the water-cooled body 15 protection air chamber 24; what be connected at the protection lower end of air chamber 24 and rifle body 7 and water-cooled body 15 is air sifter 19; ignition tip 17 inserts in the cavity of water-cooled body 15 lower ends; form one with water-cooled body 15, the welding wire chamber connects whole water-cooled body 15 and ignition tip 17.During welding, welding wire 3 passes from the welding wire chamber at water-cooled body 15 and ignition tip 17 centers, is sent to by wire feeder; Logical cooling water in the water-cooled body 15; By air inlet 14 logical protective gas 16 in protection air chamber 24, protective gas 16 flows to weld seam through air sifter.
When adopting above-mentioned welding gun to carry out narrow cap gas-shield metal arc welding, cause the main cause of sidewall incomplete fusion to be easily: groove width is very narrow, so, electric arc can only aim at the groove bottom direction, whole narrow gap weld seam is to pile up by single track, multilayer weld that wire melting forms to form, and every layer of weld seam sprawled and with the sidewall fusing and the two side is coupled together to sidewall by liquid molten pool metal.Because liquid molten pool metal has bigger surface tension, and the oxide slag inclusion all can hinder the liquid state of molten pool metal and fully spread to side-wall metallic, thereby cause sidewall incomplete fusion defective always attached to weld pool surface formation oxide layer.Especially when just beginning to weld, because weldment is in cold conditions, the size in molten bath is less, liquid metal mobile relatively poor, the easier sidewall incomplete fusion that causes.
On producing, when groove width is wide slightly, also use the method for torch swinging or wire oscillation to strengthen the flowability of liquid state of molten pool metal, and make the oxide layer fragmentation of weld pool surface, thereby eliminate the sidewall incomplete fusion.But during misoperation, ignition tip or welding wire can bump against with sidewall, thereby cause the instability of welding arc, can produce even more serious sidewall incomplete fusion.
Summary of the invention
1. the technical problem that will solve: in order to overcome the deficiency that the sidewall incomplete fusion appears when the narrow cap gas-shield metal arc welding in prior art easily, the invention provides a kind of welding gun for narrow cap gas-shield metal arc welding, by increasing a piezoelectric chip, make in welding process, piezoelectric chip is under the effect of high-frequency generator, launch ultrasonic beam continuously, cause that liquid metal produces ultrasonic vibration, can change the surface tension of liquid molten pool metal, strengthen the ability of the mobile and broken oxide-film of liquid metal, make liquid state of molten pool metal and weldment groove side-wall metallic fully fuse, thereby eliminate sidewall incomplete fusion defective.
2. technical scheme: a kind of welding gun for narrow cap gas-shield metal arc welding; comprise the rifle body; the water-cooled body; ignition tip; junction block and air sifter; the rifle body is connected by upper cover plate and water-cooled body; be fixed with junction block on the upper cover plate; it between rifle body and the water-cooled body protection air chamber; the protection air chamber is communicated with air inlet; what be connected at the protection lower end of air chamber and rifle body and water-cooled body is air sifter; ignition tip inserts in the cavity of water-cooled body lower end, is integral with the water-cooled bodily form, and the welding wire chamber connects whole water-cooled body and ignition tip; be characterized in also comprising the piezoelectric chip and the matching layer that are positioned at the protection air chamber; the external diameters of the internal diameter of piezoelectric chip and matching layer and water-cooled body etc. are big, and the internal diameter of its external diameter and rifle body etc. are big, and piezoelectric chip is superimposed upon on the matching layer and places on the boss of the external circle of water-cooled; be fixed with back-up ring, on the piezoelectric chip; following two sides is electrically connected with high-frequency generator by lead.
3. beneficial effect: owing to increased a piezoelectric chip, so in welding process, piezoelectric chip is under the effect of high-frequency generator, launch ultrasonic beam continuously, cause that liquid metal produces ultrasonic vibration, changed the surface tension of liquid molten pool metal, strengthened the ability of the mobile and broken oxide-film of liquid metal, make liquid state of molten pool metal and weldment groove side-wall metallic fully fuse, thereby eliminated sidewall incomplete fusion defective.
Below in conjunction with the drawings and specific embodiments the present invention is elaborated.
Description of drawings
Fig. 1 is a welding gun for narrow cap gas-shield metal arc welding structural representation of the present invention.
Fig. 2 is a prior art welding gun for narrow cap gas-shield metal arc welding structural representation.
Among the figure: 3-welding wire, 6-upper cover plate, 7-rifle body, 8-back-up ring; the 9-piezoelectric chip, 10-matching layer, 11-boss; the 13-high-frequency generator, 14-air inlet, 15-water-cooled body; the 16-protective gas, 17-ignition tip, 18-weldment; the 19-air sifter, 20-electric arc, 21-molten bath; the 22-junction block, 23-groove sidewall, 24-protects air chamber.
The specific embodiment
With reference to Fig. 2, the present invention includes rifle body 7, water-cooled body 15, ignition tip 17, junction block 22 and air sifter 19.Rifle body 7 is connected by upper cover plate 6 and water-cooled body 15; be fixed with junction block 22 on the upper cover plate 6; it between rifle body 7 and the water-cooled body 15 protection air chamber 24; protection air chamber 24 is communicated with air inlet 14; what be connected at the protection lower end of air chamber 24 and rifle body 7 and water-cooled body 15 is air sifter 19; ignition tip 17 inserts in the cavity of water-cooled body 15 lower ends, forms one with water-cooled body 15, and the welding wire chamber connects whole water-cooled body 15 and ignition tip 17.Annular boss 11 has been designed at annular water-cooled body 15 cylindricals position placed in the middle up and down, and annular matching layer 10 and ring piezoelectric wafer 9 are successively placed on the boss 11, is fixed with back-up ring 8 then.Annular matching layer 10 and the internal diameter of ring piezoelectric wafer 9 and the external diameter of annular water-cooled body 15 etc. are big, and the internal diameter of its external diameter and rifle body 7 etc. are big.The upper and lower faces of piezoelectric chip 9 is coated with conducting metal, passes preformed hole on the rifle body 7 by lead respectively, is electrically connected with two terminals of high-frequency generator 13.
During welding, connect cooling water for earlier water-cooled body 15; Feed protective gas by air inlet 14; Behind the striking arc 20, start high-frequency generator 13 work immediately, make piezoelectric chip 9 produce ultrasonic wave; Welding gun moves in groove, and motlten metal is piled up in the molten bath 21, finishes the multilayer welding continuously.Adjust the oscillating voltage amplitude of high-frequency generator 13 outputs, can adjust the air ultrasound intensity of wave.Piezoelectric chip 9 is launched ultrasonic beam continuously under the effect of high-frequency generator 13.Ultrasonic beam is imported the molten bath into and is caused that just liquid metal produces ultrasonic vibration.This ultrasonic vibration, changed the surface tension of liquid molten pool metal on the one hand, strengthened the ability of the mobile and broken oxide layer of liquid solder metal, made groove sidewall 23 metals of liquid state of molten pool metal and weldment 18 fully fuse, thereby eliminated the generation of sidewall incomplete fusion defective; The crystallization direction of having upset liquid metal on the other hand, refinement weld grain, improved the mechanical property of joint.Therefore, obtained the high quality welding joint.
The matching layer 10 of piezoelectric chip 9 is selected silicon rubber for use, can effectively strengthen the aerial propagation distance of ultrasonic wave.Piezoelectric chip 9 is installed in the periphery of annular water-cooled body 15 with matching layer 10 and protects the top of air inlet 14 on the air chamber 24, and cooling water and high speed protective gas all can produce good cooling effect to it, make it be in safe lower temperature in welding process.
Application Example 1: groove depth 50mm, width 10mm.Welding gun ignition tip length 50mm, external diameter φ 7.The oscillating voltage amplitude of high-frequency generator 13 outputs is 750V.After the striking, start high-frequency generator work immediately, finish welding after, blow-out simultaneously and turn-off high-frequency generator 13.The postwelding joint is dissected check, do not find sidewall incomplete fusion defective, and grain refinement.
Application Example 2: groove depth 60mm, width 10mm.Welding gun ignition tip length 60mm, external diameter φ 7.The oscillating voltage amplitude of high-frequency generator 13 outputs is 950V.After the striking, start high-frequency generator work immediately.After finishing welding, blow-out simultaneously and shutoff high-frequency generator 13.The postwelding joint is dissected check, do not find sidewall incomplete fusion defective, and grain refinement.
Claims (3)
1; a kind of welding gun for narrow cap gas-shield metal arc welding; comprise the rifle body; the water-cooled body; ignition tip; junction block and air sifter; the rifle body is connected by upper cover plate and water-cooled body; be fixed with junction block on the upper cover plate; it between rifle body and the water-cooled body protection air chamber; the protection air chamber is communicated with air inlet; what be connected at the protection lower end of air chamber and rifle body and water-cooled body is air sifter; ignition tip inserts in the cavity of water-cooled body lower end, is integral with the water-cooled bodily form, and the welding wire chamber connects whole water-cooled body and ignition tip; it is characterized in that: also comprise the piezoelectric chip and the matching layer that are positioned at the protection air chamber; the external diameters of the internal diameter of piezoelectric chip and matching layer and water-cooled body etc. are big, and the internal diameter of its external diameter and rifle body etc. are big, and piezoelectric chip is superimposed upon on the matching layer and places on the boss of the external circle of water-cooled; be fixed with back-up ring, on the piezoelectric chip; following two sides is electrically connected with high-frequency generator by lead.
2, welding gun for narrow cap gas-shield metal arc welding according to claim 1 is characterized in that: described matching layer, its material are silicon rubber.
3, welding gun for narrow cap gas-shield metal arc welding according to claim 1 is characterized in that: described piezoelectric chip is positioned at the top of air inlet on the protection air chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200296674U CN201223993Y (en) | 2008-07-17 | 2008-07-17 | Welding gun for narrow cap gas-shield metal arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200296674U CN201223993Y (en) | 2008-07-17 | 2008-07-17 | Welding gun for narrow cap gas-shield metal arc welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201223993Y true CN201223993Y (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200296674U Expired - Lifetime CN201223993Y (en) | 2008-07-17 | 2008-07-17 | Welding gun for narrow cap gas-shield metal arc welding |
Country Status (1)
| Country | Link |
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| CN (1) | CN201223993Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323045B (en) * | 2008-07-17 | 2010-06-02 | 西北工业大学 | Welding gun for narrow cap gas-shield metal arc welding |
| CN102601504A (en) * | 2012-04-10 | 2012-07-25 | 山东大学 | Welding torch with function of delivering double layers of airflow |
-
2008
- 2008-07-17 CN CNU2008200296674U patent/CN201223993Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323045B (en) * | 2008-07-17 | 2010-06-02 | 西北工业大学 | Welding gun for narrow cap gas-shield metal arc welding |
| CN102601504A (en) * | 2012-04-10 | 2012-07-25 | 山东大学 | Welding torch with function of delivering double layers of airflow |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090422 Effective date of abandoning: 20080717 |