CN104526174A - Ultrasonic plasma arc welding process and device - Google Patents
Ultrasonic plasma arc welding process and device Download PDFInfo
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- CN104526174A CN104526174A CN201410777307.2A CN201410777307A CN104526174A CN 104526174 A CN104526174 A CN 104526174A CN 201410777307 A CN201410777307 A CN 201410777307A CN 104526174 A CN104526174 A CN 104526174A
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- 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
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Abstract
The invention discloses an ultrasonic plasma arc welding process and device. According to the ultrasonic plasma arc welding process, ultrasonic vibration is performed on base metal close to a furnace hearth and weld joints in real time during the plasma arc welding process, and then molten metal structures are dense and uniform, metal crystal grains at the weld joints are thinned, welding stress and welding deformation are reduced, and the fatigue intensity and the fatigue service life of a welded joint are improved. The ultrasonic plasma arc welding device comprises an energy converter and an amplitude transformer; the energy converter is fixedly connected to one end of the amplitude transformer; an empty chamber at the other end of the amplitude transformer is provided with a welding nozzle and a protection gas nozzle; the welding nozzle is arranged inside the protection air nozzle; an electrode is arranged inside the welding nozzle; an ion gas inlet pipe is arranged on the welding nozzle; a protection gas inlet pipe is arranged on the protection gas nozzle; the lower end surface of the amplitude transformer is provided with an air discharge groove. According to the ultrasonic plasma arc welding process and device, during plasma arc welding, high-frequency vibration processing is performed on base metal close to the furnace hearth and the weld joints in real time, grains at the weld joints are fined, the metal structures are dense, gas inside the weld joints is completely precipitated, welding deformation is reduced, the fatigue intensity and the fatigue service life of the welding joint are improved, and the welding quality is guaranteed.
Description
Technical field
The present invention relates to a kind of technique and the device that metal works are carried out to PLASMA ARC WELDING, belong to plasma arc welding (PAW) technical field.
Background technology
Plasma arc welding (PAW) utilizes plasma arc as the welding method of thermal source.Gas produces dissociation by electric arc heated, is compressed, energization density and the degree of dissociation in high speed by during water-cooled nozzle, and form plasma arc, electric arc, is welded with what by the after-combustion of auxiliary electrode high-frequency arc strike between electrode and workpiece.Plasma arc penetration or burn through sheet material, form welding pool.Its stability, caloric value and temperature, all higher than general electric arc, thus have larger penetration power and speed of welding.The formation gas of plasma arc and the protective gas around it generally use argon.According to various material, also have and to use helium or the mist such as argon helium, argon hydrogen.Plasma arc soldering equipment is made up of parts such as the source of welding current, welding gun, control circuit, gas circuit and water routes usually.
PLASMA ARC WELDING belongs to high-quality welding method.Dark/wide ratio of weld seam is large, and heat affected area is narrow, and workpiece deformation is little, and weldable material kind is many.But in forming process, drip molding will bear the continuous input of electric arc heat, thus causes its bulk temperature to raise, shaping track heat affected area becomes large, the fuel factors such as molten pool metal mobility enhancing, and this is totally unfavorable for control drip molding surface quality.And the overall thermal distortion that postwelding causes all has a great impact the size of drip molding and shape.When welding, molten pool metal combines tight, the coarse grains of commissure, workpiece be welded to connect the fatigue strength at place and fatigue life low.
Current occurred ultrasonic vibration agitating friction burn-on application technology, disclosed in CN102744516A " Friction stir welding and device are assisted in ultrasonic vibration ", by supersonic generator, industrial-frequency alternating current is converted to superaudible high frequency ac signal, be ultrasonic mechanical vibration energy through transducer by electric energy conversion again, after amplifying amplitude further, by tool heads from the to-be-welded region around stirring-head first by ultrasonic delivery material, then stirring-head is had to weld along welding direction.Also has CN102581471A disclosed " the ultrasonic assistant Semi-solid Stirring friction welding method that a kind of shaft shoulder is fixed and mixing needle rotates ".Compared with normal agitation friction welding (FW), in friction stir welding, ultrasonic vibration can obtain good appearance of weld, contribute to improving welding efficiency, nugget district and the refinement all to some extent of heat-mechanical affected zone crystal grain in additional ultrasonic rear Microstructure of Joint, there is certain positive impact to improving seam organization, contributing to the mechanical property improving weld seam.
But plasma arc welding (PAW) is different from the principle of friction stir welding, the structure of welding equipment is also different, and the burn-on structure of ultrasonic vibration of agitating friction can not be directly used in plasma arc welding (PAW).Ultrasonic wave is not also had at present to burn-on at plasma arc the bibliographical information of application.
Summary of the invention
The present invention is directed to the deficiency that existing plasma arc welding technology exists, there is provided a kind of and can make commissure grain refinement, improve welded joint fatigue strength and fatigue life, the ultrasonic wave plasma arc Welding of minimizing welding stress and welding deformation, a kind of ultrasonic wave plasma arc welder realizing this technique is provided simultaneously.
Ultrasonic wave plasma arc Welding of the present invention, in real time ultrasonic wave vibration is carried out to the mother metal near molten bath and weld seam in plasma arc welding (PAW) process, make motlten metal dense structure even, commissure metal grain refinement, accelerate molten bath gas evolution, reduce welding stress and welding deformation, improve welded joint fatigue strength and fatigue life, thus increase substantially welding quality.
Realize the ultrasonic wave plasma arc welder of above-mentioned technique, by the following technical solutions:
This device; comprise transducer and ultrasonic transformer; transducer is fixedly connected on one end of ultrasonic transformer, and the other end of ultrasonic transformer is provided with cavity, is provided with welding tip and protection gas jets in this cavity; welding tip is arranged in protection gas jets; be provided with electrode in welding tip, in welding tip, cooling water cavity is set, welding tip is provided with ion-gas air inlet pipe; protection gas jets is provided with protection gas air inlet pipe, the lower surface of ultrasonic transformer offers air discharge duct.
The lower end of electrode is in the cavity of ultrasonic transformer, and produces best plasma arc when the distance between electrode lower end with ultrasonic transformer lower surface can make the end face of ultrasonic transformer contact with welded piece between electrode and welded piece.
Plasma arc welding (PAW) is arranged in ultrasonic transformer by said apparatus, while welding, carry out ultrasonic vibration to the mother metal near molten bath and weld seam.During welding, transducer is connected with supersonic generator, ultrasonic transformer is against the mother metal place on weld seam both sides, welding wire is put in seam crossing, pass into ion-gas and protective gas respectively to welding tip and protection gas jets.Switch on power, form welding arc in commissure.Ultrasonic transformer vibrates under the drive of transducer, simultaneously, ultrasonic transformer by this effect of vibration to commissure, the motlten metal in molten bath and the mother metal near molten bath is made to produce vibration, thus it is finer and close to make motlten metal organize, crystal grain is refinement more, and reduces welding stress and welding deformation, gas in molten bath is separated out more up hill and dale, improves fatigue strength and the fatigue life of welding point.Ultrasonic transformer moves along seam with certain speed together with welding wire, completes the welding of whole seam, obtains high-quality weld seam.
The present invention is while carrying out PLASMA ARC WELDING, utilize ultrasonic wave to vibrate and vibration processing is carried out to the mother metal near molten bath and weld seam, make the refinement more of commissure crystal grain, metal structure is finer and close, gas evolution in weld seam is more thorough, reduce welding deformation, improve fatigue strength and the fatigue life of welding point, ensure that welding quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of ultrasonic wave plasma arc welder of the present invention.
In figure: 1, electrode, 2, welding tip, 3, protection gas jets, 4, ultrasonic transformer, 5, air discharge duct; 6, workpiece, 7, molten bath, 8, plasma arc, 9, cooling water cavity, 10, ion-gas air inlet pipe; 11, gas air inlet pipe is protected, 12, water inlet pipe, 13, outlet pipe, 14, wire, 15, transducer.
Detailed description of the invention
Ultrasonic wave plasma arc welder of the present invention as shown in Figure 1, mainly comprise transducer 15 and ultrasonic transformer 4, transducer 15 is fixedly connected on one end of ultrasonic transformer 4, the other end of ultrasonic transformer 4 is provided with the cavity that is held nozzle, welding tip 2 and protection gas jets 3 is provided with in this cavity, welding tip 2 is arranged in protection gas jets 3, the center of welding tip 2 is provided with electrode 1, the cooling water cavity 9 of annular is provided with in welding tip 2, cooling water cavity 9 is communicated with outlet pipe 13 with the water inlet pipe 12 on welding tip 2, form recirculated cooling water, welding tip 2 is cooled.Welding tip 2 is also provided with ion-gas air inlet pipe 10.Protection gas jets 3 is provided with protection gas air inlet pipe 11.The lower end of electrode 1 is in the cavity of ultrasonic transformer 4, and weld material between the lower surface of the lower surface of electrode 1 and ultrasonic transformer 4 and set certain distance, best plasma arc 8 can be produced during to guarantee that the end face of ultrasonic transformer 4 contacts with welded piece 6 between electrode 1 and welded piece.The lower surface of ultrasonic transformer 4 offers air discharge duct 5 and welding wire groove (vertical with air discharge duct 5).
The side of ultrasonic transformer 4 is provided with and can makes the opening that ion-gas air inlet pipe 10, protection gas air inlet pipe 11, water inlet pipe 12 and outlet pipe 13 enter and the opening that the wire 14 be connected with electrode 1 is drawn, and the gap of these openings and above-mentioned parts will make ultrasonic transformer 4 can free vibration.Also ion-gas air inlet pipe 10, protection gas air inlet pipe 11, water inlet pipe 12 and outlet pipe 13 can be made to be fixed as one with ultrasonic transformer 4, and ultrasonic transformer 4 drives welding tip 2 to vibrate together with protection gas jets 3 is in welding process.
For the ease of installing, ultrasonic transformer 4 can be made left and right two parts, recombinant together.
The operating process of above-mentioned ultrasonic wave plasma arc welder, as described below:
Electrode 1 is connected with outside high-frequency generator by wire 14, and workpiece 6 is also connected with high-frequency generator simultaneously.Transducer 15 is connected with supersonic generator; ultrasonic transformer 4 is against the mother metal place (ultrasonic transformer 4 end face and welded piece surface contact) on weld seam both sides; welding wire is put in seam crossing by welding wire groove; in welding tip 2, pass into ion-gas (argon gas, helium or the mist such as argon helium, argon hydrogen) by ion-gas air inlet pipe 10, in protection gas jets 3, pass into protective gas (argon gas, helium or the mist such as argon helium, argon hydrogen) by protection gas air inlet pipe 11.Switch on power, form plasma arc 8 at seam crossing), seam crossing metal molten forms metal bath 7, and ion-gas and protective gas are discharged from air discharge duct 5.Ultrasonic transformer 4 vibrates under the drive of transducer 15, while welding, ultrasonic vibration is carried out to the mother metal near molten bath and weld seam, make the motlten metal dense structure in molten bath 7 even, crystal grain is refinement more, reduce welding stress and welding deformation, thus improve fatigue strength and the fatigue life of welding point.Ultrasonic transformer 4 moves along seam together, completes the welding of whole seam.
Claims (2)
1. a ultrasonic wave plasma arc Welding, it is characterized in that: be in real time ultrasonic wave vibration is carried out to the mother metal near molten bath and weld seam in plasma arc welding (PAW) process, make motlten metal dense structure even, commissure metal grain refinement, accelerate molten bath gas evolution, reduce welding stress and welding deformation, improve welded joint fatigue strength and fatigue life, thus increase substantially welding quality.
2. a ultrasonic wave plasma arc welder; comprise transducer and ultrasonic transformer; it is characterized in that: transducer is fixedly connected on one end of ultrasonic transformer; the other end of ultrasonic transformer is provided with cavity; welding tip and protection gas jets is provided with in this cavity; welding tip is arranged in protection gas jets; electrode is provided with in welding tip; in welding tip, cooling water cavity is set; welding tip is provided with ion-gas air inlet pipe; protection gas jets is provided with protection gas air inlet pipe, the lower surface of ultrasonic transformer offers air discharge duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410777307.2A CN104526174A (en) | 2014-12-15 | 2014-12-15 | Ultrasonic plasma arc welding process and device |
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| CN201410777307.2A CN104526174A (en) | 2014-12-15 | 2014-12-15 | Ultrasonic plasma arc welding process and device |
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| CN104526174A true CN104526174A (en) | 2015-04-22 |
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| CN201410777307.2A Pending CN104526174A (en) | 2014-12-15 | 2014-12-15 | Ultrasonic plasma arc welding process and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588893A (en) * | 2014-12-15 | 2015-05-06 | 赵辉 | Plasma arc ultrasonic welding process and device |
| FR3043933A1 (en) * | 2015-11-25 | 2017-05-26 | Lionel Claude Lucien Soulier | EXTRUSION NOZZLE OF MULTIPLE NON-METALLIC MATERIALS FOUNDED FOR ADDITIVE MANUFACTURING |
| CN111673272A (en) * | 2020-05-21 | 2020-09-18 | 哈尔滨工业大学 | Swing laser-ultrasonic composite welding method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588893A (en) * | 2014-12-15 | 2015-05-06 | 赵辉 | Plasma arc ultrasonic welding process and device |
| FR3043933A1 (en) * | 2015-11-25 | 2017-05-26 | Lionel Claude Lucien Soulier | EXTRUSION NOZZLE OF MULTIPLE NON-METALLIC MATERIALS FOUNDED FOR ADDITIVE MANUFACTURING |
| EP3173214A1 (en) * | 2015-11-25 | 2017-05-31 | Lionel Soulier | Extrusion nozzle for non-metallic molten materials |
| CN111673272A (en) * | 2020-05-21 | 2020-09-18 | 哈尔滨工业大学 | Swing laser-ultrasonic composite welding method |
| CN111673272B (en) * | 2020-05-21 | 2022-03-01 | 哈尔滨工业大学 | Swing laser-ultrasonic composite welding method |
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Application publication date: 20150422 |
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