CN103128423A - Laser tungsten inert gas (TIG) arc coaxial hybrid welding method with additional high frequency magnetic field and device - Google Patents
Laser tungsten inert gas (TIG) arc coaxial hybrid welding method with additional high frequency magnetic field and device Download PDFInfo
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- CN103128423A CN103128423A CN2013100390065A CN201310039006A CN103128423A CN 103128423 A CN103128423 A CN 103128423A CN 2013100390065 A CN2013100390065 A CN 2013100390065A CN 201310039006 A CN201310039006 A CN 201310039006A CN 103128423 A CN103128423 A CN 103128423A
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Abstract
The invention relates to a laser TIG arc coaxial hybrid welding method with an additional high frequency magnetic field and a device. The method includes firstly connecting positive and negative poles of a TIG welding machine to a workpiece and a tungsten electrode respectively, then connecting an exciting power output end to a field coil, connecting the field coil with a laser TIG composite welding head through a composite welding head connecting device, and determining a welding running path; and opening an exciting power supply to supply power for the field coil; opening shielding gas for welding and observing the weld seam formation condition. The method and the device have the advantages that the arc pneumatic pressure and the arc current density are effectively improved, so that the arc heat distribution is concentrated, the arc radius is compressed, the arc energy density and the arc stiffness are further improved, the stability of the welding arc in a laser arc composite welding process is improved, the coaxial composite degree of the laser and the arc during laser TIG arc composite coaxial welding is quite facilitated, and wide markets and application prospects are provided.
Description
Technical field
The present invention relates to the materials processing technology field, particularly add the coaxial complex welding method of laser TIG electric arc and the device of high frequency magnetic field.
Background technology
In laser-coaxial composite welding of TIG electric arc, because electric arc and laser have good alignment, there are not both relative position problems, and can realize smoothly the contour horizontal welding requirements of the electric arc combined welding 3 D stereo welding of laser-TIG, yet, in the coaxial composite welding process of high power laser electric arc, photo plasma shields outside laser effect laser utilization rate on the one hand, also can make the drift of welding arc generation anode spot, affect laser and electric arc axiality both in laser-coaxial composite welding of TIG electric arc, affect welding quality.
patent documentation: the electric arc combined melt-brazing method of laser TIG and equipment that a kind of electromagnetic electric current coupled field is auxiliary, number of patent application: 201010171331.3, on the mode of externally-applied magnetic field, employing adds low frequency magnetic field makes electric arc rotation expansion melt solder, be used for the hybrid Laser-Arc Welding soldering, secondly, adding low frequency magnetic field makes the heat input of electric arc thermal source average, the input of electric arc arc column central hot reduces, the ability that electric arc itself impacts fusion penetration ability and the burning of hybrid Laser-Arc Welding arc stability reduces, in the present invention, add high frequency magnetic field and make welding arc generation magnetic compression, after the energy density of welding arc and deflection are increased, play the effect that increases fusion penetration and stable arc burning, the described patent of document belongs to a kind of wire filling laser welding on welding method in addition, TIG electric arc be produce between solder and tungsten electrode and be not to be between tungsten electrode and workpiece, it not the electric arc combined welding of traditional laser-TIG, simultaneously, what the present invention adopted is laser-coaxial complex welding method of TIG electric arc.
Based on above understanding, the present invention proposes to add high frequency magnetic field, act on the one hand the photo plasma that laser produces, reduce the photic three-dimensional shielding action to laser that waits, act on the other hand welding arc, improve electric arc homeostasis burning capacity, increase laser and electric arc in coaxial composite welding process, wide market and application prospect are arranged.
Summary of the invention
The purpose of this invention is to provide a kind of laser that the adds high frequency magnetic field-coaxial complex welding method of TIG electric arc and device of laser and the coaxial Compound Degree of electric arc when improving laser utilization rate and the electric arc combined coaxial welding of laser TIG.
For achieving the above object, the present invention realizes by the following technical solutions:
Add the coaxial complex welding method of laser TIG electric arc of high frequency magnetic field, complete according to the following steps:
1) at first the both positive and negative polarity of tig arc welding machine is connected to respectively workpiece and tungsten electrode, then the excitation power supply output is connected on magnetizing coil, magnetizing coil is linked together by composite welding head jockey and Laser-TIG Hybrid Welding head, determine the welding walking path;
2) open excitation power supply, power to magnetizing coil, exciting curent by the excitation power supply generation, power supply is to magnetizing coil, making magnetizing coil is the high frequency magnetic field of 0～20KHz in the coaxial composite welding of laser-TIG electric arc zone generation frequency, high frequency magnetic field in the zone generation of the coaxial composite welding of laser-TIG electric arc acts on the photo plasma that laser produces, reduce the photic three-dimensional shielding action to laser that waits, improve the laser utilization rate, simultaneously, also act on welding arc, due to the high-frequency variation of externally-applied magnetic field and the difference of arc-plasma and air permeability, will form a poor △ P of magnetic pressure inside and outside electric arc, this magnetic pressure missionary society produces high frequency magnetic compression effect to electric arc, improve arc energy density and deflection, the compression arc radius, improve electric arc homeostasis burning capacity and the ability of impacting fusion penetration in laser-coaxial composite welding of TIG electric arc, improve simultaneously the laser beam ability coaxial with the electric arc maintenance in the coaxial composite welding process of laser-TIG electric arc, avoid due in welding process because coaxial degree reduces the welding procedure defective that produces,
3) opening protection gas welds, observe the appearance of weld situation, exciting curent by regulating 0～200A and 25%～75% duty are recently adjusted the introducing intensity of high frequency magnetic field, adjust the pull-in frequency of high frequency magnetic field by the exciting curent frequency of regulating 0～20KHz, improve the electric arc combined welded seam forming technology of laser-TIG, weld penetration can increase along with the increase of exciting curent frequency and magnetic field intensity, under the laser power of the welding current of 0 identical～500A and 0～6000W, add high frequency magnetic field and be significantly increased than the weld penetration that does not add magnetic field laser-coaxial composite welding of TIG electric arc, increasing degree is 10%～35% left and right, the grain structure of welding heat affected zone becomes fine and closely woven, crisp hard tendency obviously reduces.
Add the device that laser-the coaxial complex welding method of TIG electric arc uses of high frequency magnetic field, comprise tig arc welding machine, laser-coaxial composite welding head of TIG electric arc, tungsten electrode, magnetizing coil, excitation power supply and composite welding head jockey, the both positive and negative polarity of described tig arc welding machine is connected with tungsten electrode with workpiece respectively, tungsten electrode is arranged on the inside of Laser-TIG Hybrid Welding head, Laser-TIG Hybrid Welding head bottom is connected with magnetizing coil by the composite welding head jockey, and magnetizing coil two ends are connected with the both positive and negative polarity of excitation power supply respectively.
Compared with prior art, the invention has the beneficial effects as follows:
add the laser of the high frequency magnetic field-coaxial complex welding method of TIG electric arc and device, have the advantages that volume is little, cost is low, easy to use, owing to adding high frequency magnetic field, effectively improved the electric arc Pneumatic pressure, arc current density, the electric arc heat is distributed more concentrated, compressed arc radius, and then improved the deflection of arc energy density and electric arc, these all make the degree of stability of welding arc in the hybrid Laser-Arc Welding process improve, and then the coaxial Compound Degree of laser and electric arc when extremely being conducive to the electric arc combined coaxial welding of laser-TIG, on the other hand, charged particle in plasma is moved under the effect of Lorentz force, the shape of its density and distribution and plasma and position all can change, thereby reduce photo plasma to the screen effect of laser, improve utilization ratio of laser energy, thereby further improve welding efficiency and welding process stability, in addition, add the refinement that high frequency magnetic field also helps flowing of molten pool metal and weld grain tissue, and then effectively improve from every side the appearance of weld of laser-coaxial composite welding of TIG electric arc, effectively optimized welding procedure, wide market and application prospect are arranged.
Description of drawings
Fig. 1 is structure chart of the present invention.
1-tig arc welding machine, the 2-laser-coaxial composite welding head 3-tungsten electrode of TIG electric arc 4-workpiece 5-magnetizing coil 6-excitation power supply 7-composite welding head jockey 8-laser beam
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further illustrated:
as shown in Figure 1, the present invention adds the device that the coaxial complex welding method of laser TIG electric arc of high frequency magnetic field uses, comprise tig arc welding machine 1, the coaxial composite welding head 2 of laser-TIG electric arc, tungsten electrode 3, magnetizing coil 5, excitation power supply 6 and composite welding head jockey 7, the both positive and negative polarity of described tig arc welding machine 1 is connected with tungsten electrode 3 with workpiece 4 respectively, tungsten electrode 3 is arranged on the inside of Laser-TIG Hybrid Welding head 2, Laser-TIG Hybrid Welding head 2 bottoms are connected with magnetizing coil 5 by composite welding head jockey 7, magnetizing coil 2 two ends are connected with the both positive and negative polarity of excitation power supply 6 respectively.
Add the laser of high frequency magnetic field-coaxial complex welding method of TIG electric arc, complete according to the following steps:
1) at first the both positive and negative polarity of tig arc welding machine 1 is connected to respectively workpiece 4 and tungsten electrode 3, then excitation power supply 6 outputs are connected on magnetizing coil 5, magnetizing coil 5 is linked together by composite welding head jockey 7 and Laser-TIG Hybrid Welding head 2, determine the welding walking path;
2) open excitation power supply 6, give magnetizing coil 5 power supplies, exciting curent by excitation power supply 6 generations, making magnetizing coil 5 is the high frequency magnetic field of 0～20KHz in the coaxial composite welding of laser-TIG electric arc zone generation frequency, high frequency magnetic field in the zone generation of the coaxial composite welding of laser-TIG electric arc acts on the photo plasma that laser produces, reduce the photic three-dimensional shielding action to laser that waits, improve the laser utilization rate, simultaneously, also act on welding arc, due to the high-frequency variation of externally-applied magnetic field and the difference of arc-plasma and air permeability, will form a poor △ P of magnetic pressure inside and outside electric arc, this magnetic pressure missionary society produces high frequency magnetic compression effect to electric arc, improve arc energy density and deflection, the compression arc radius, improve electric arc homeostasis burning capacity and the ability of impacting fusion penetration in laser-coaxial composite welding of TIG electric arc, improve simultaneously the laser beam ability coaxial with the electric arc maintenance in the coaxial composite welding process of laser-TIG electric arc, avoid due in welding process because coaxial degree reduces the welding procedure defective that produces,
3) opening protection gas welds, observe the appearance of weld situation, exciting curent by regulating 0～200A and 25%～75% duty are recently adjusted the introducing intensity of high frequency magnetic field, adjust the pull-in frequency of high frequency magnetic field by the exciting curent frequency of regulating 0～20KHz, improve the electric arc combined welded seam forming technology of laser-TIG, weld penetration can increase along with the increase of exciting curent frequency and magnetic field intensity, under the laser power of the welding current of 0 identical～500A and 0～6000W, add high frequency magnetic field and be significantly increased than the weld penetration that does not add magnetic field laser-coaxial composite welding of TIG electric arc, increasing degree is 10%～35% left and right, the grain structure of welding heat affected zone becomes fine and closely woven, crisp hard tendency obviously reduces.
When using this method; at first according to the material of workpiece 4, thickness of slab, cut form etc.; specify welding condition; as welding current, laser power, speed of welding, shielding gas flow amount, tungsten electrode 3 and workpiece 4 distances etc., these technological parameters electric arc combined welding standard technological parameter of laser-TIG according to without externally-applied magnetic field the time is formulated.
Embodiment one
The laser of galvanized steel plain sheet Q345B and 7075 aluminum alloy materials-TIG electric arc paraxonic composite welding, utilization adds high frequency magnetic field auxiliary laser-TIG electric arc paraxonic complex welding method, welding work pieces 4 thickness are 3mm, banjo fixing butt jointing, the composite welding process parameter is: DC TIG welding connects, the upper end that excitation power supply 6 positive poles are received magnetizing coil 5, the lower end that excitation power supply 6 negative poles are received magnetizing coil 5, tungsten electrode 3 diameter of phi 2-4mm; Welding current 100-220A; Exciting curent frequency 1～20KHz; Dutycycle 25%～50%; IPG YLS-6000 optical fiber laser, power 3500W, spot diameter 1mm, speed of welding 0.1-3.5m/min by parameter optimization, reaches required joint performance.
Above described be only basic principle of the present invention, be not that the present invention is imposed any restrictions, everyly according to the present invention, it is carried out equivalent variations and modification, all within the category of the art of this patent protection scheme.
Claims (2)
1. add the laser of high frequency magnetic field-coaxial complex welding method of TIG electric arc, it is characterized in that, complete according to the following steps:
1) at first the both positive and negative polarity of tig arc welding machine is connected to respectively workpiece and tungsten electrode, then the excitation power supply output is connected on magnetizing coil, magnetizing coil is linked together by composite welding head jockey and Laser-TIG Hybrid Welding head, determine the welding walking path;
2) open excitation power supply, power to magnetizing coil, exciting curent by the excitation power supply generation, making magnetizing coil is the high frequency magnetic field of 0～20KHz in the coaxial composite welding of laser-TIG electric arc zone generation frequency, high frequency magnetic field in the zone generation of the coaxial composite welding of laser-TIG electric arc acts on the photo plasma that laser produces, reduce the photic three-dimensional shielding action to laser that waits, improve the laser utilization rate, simultaneously, also act on welding arc, due to the high-frequency variation of externally-applied magnetic field and the difference of arc-plasma and air permeability, will form a poor △ P of magnetic pressure inside and outside electric arc, this magnetic pressure missionary society produces high frequency magnetic compression effect to electric arc, improve arc energy density and deflection, the compression arc radius, improve electric arc homeostasis burning capacity and the ability of impacting fusion penetration in laser-coaxial composite welding of TIG electric arc, improve simultaneously the laser beam ability coaxial with the electric arc maintenance in the coaxial composite welding process of laser-TIG electric arc, avoid due in welding process because coaxial degree reduces the welding procedure defective that produces,
3) opening protection gas welds, observe the appearance of weld situation, exciting curent by regulating 0～200A and 25%～75% duty are recently adjusted the introducing intensity of high frequency magnetic field, adjust the pull-in frequency of high frequency magnetic field by the exciting curent frequency of regulating 0～20KHz, improve the electric arc combined welded seam forming technology of laser-TIG, weld penetration can increase along with the increase of exciting curent frequency and magnetic field intensity, under the laser power of the welding current of 0 identical～500A and 0～6000W, add high frequency magnetic field and be significantly increased than the weld penetration that does not add magnetic field laser-coaxial composite welding of TIG electric arc, increasing degree is 10%～35% left and right, the grain structure of welding heat affected zone becomes fine and closely woven, crisp hard tendency obviously reduces.
2. the device that laser-the coaxial complex welding method of TIG electric arc uses that adds high frequency magnetic field according to claim 1, it is characterized in that, comprise tig arc welding machine, laser-coaxial composite welding head of TIG electric arc, tungsten electrode, magnetizing coil, excitation power supply and composite welding head jockey, the both positive and negative polarity of described tig arc welding machine is connected with tungsten electrode with workpiece respectively, tungsten electrode is arranged on the inside of Laser-TIG Hybrid Welding head, Laser-TIG Hybrid Welding head bottom is connected with magnetizing coil by the composite welding head jockey, the magnetizing coil two ends are connected with the both positive and negative polarity of excitation power supply respectively.
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| CN103741138A (en) * | 2013-12-31 | 2014-04-23 | 浙江工业大学 | Static magnetic field-laser coaxial composite fusion covering method and device |
| CN103737176A (en) * | 2013-12-30 | 2014-04-23 | 华中科技大学 | Hybrid welding method and hybrid welding equipment for laser electromagnetic pulse |
| CN104588846A (en) * | 2014-12-08 | 2015-05-06 | 沈阳工业大学 | Method and device for increasing TIG welding electric arc energy density |
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