CN101347861B - Method for welding stainless steel thin walled pipe circular seam joint and device - Google Patents
Method for welding stainless steel thin walled pipe circular seam joint and device Download PDFInfo
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- CN101347861B CN101347861B CN2008100702155A CN200810070215A CN101347861B CN 101347861 B CN101347861 B CN 101347861B CN 2008100702155 A CN2008100702155 A CN 2008100702155A CN 200810070215 A CN200810070215 A CN 200810070215A CN 101347861 B CN101347861 B CN 101347861B
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Abstract
The invention provides a welding method of a joint of a circular seam of a stainless steel thin-wall pipe, which comprises the following steps: a work part holding and rotating mechanism is adopted to carry out holding on the joint of the work part of the stainless steel thin-wall pipe; the joint of the work part of the stainless steel thin-wall pipe is positioned in an air chamber and can rotate; the technology of non-melt electrode pulse gas shielding arc welding which is controlled by applied magnetic field is adopted to carry out welding on the joint of the circular seam of the stainless steel thin-wall pipe; the invention also provides a welding device of the joint of the circular seam of the stainless steel thin-wall pipe, which comprises a work part holding and rotating mechanism, a centre, a welding torch, an air sifter, an air chamber and an excitation device of the applied magnetic field; the applied electromagnetic field is generated in the welding joint area so as to realize the welding process of electromagnetic stirring. The method and the device of the invention realize the welding with good quality, high efficiency, low cost and high stability of the joint of the circular seam of the thin-wall pipe made of various materials such as stainless steel, pick and alloy thereof, magnesium alloy and aluminium alloy.
Description
Technical field
The present invention relates to stainless-steel thin-wall pipe welding engineering field, particularly a kind of welding method and device of stainless-steel thin-wall pipe girth joint joint.
Background technology
Stainless-steel thin-wall pipe is widely used in fields such as metallurgy, chemical industry, food, space flight, aviation, nuclear industry, and its thickness is generally less than 3mm.Because the stainless steel wire coefficient of expansion is big; thermal conductivity is little; the wall thickness that adds light-wall pipe is thinner; stainless-steel thin-wall pipe is the austenitic stainless steel light-wall pipe particularly; when adopting common non-melt pole inert gas-shielded arc welding to connect; usually welding deformation can appear; weld crack; pore; be mingled with; defective such as lack of penetration; particularly in the very high Aero-Space of some performance requirements; the nuclear industry field is not allow to occur these defectives; therefore must spend great amount of manpower; material resources and time are detected each bar weld seam; carry out the adjustment of weld procedure specification according to material quality and Welding Structure repeatedly; so need a kind of simple and practical reliable method of searching or equipment to address this problem, to enhance productivity.
Chinese patent ZL200510069264.3 discloses " a kind of welding method of stainless steel composite pipe ", it is mainly used in the solution composite steel tube and is easy to generate defectives such as pore, crackle when using common fusion welding method, improve welding efficiency simultaneously, reduce welding cost; Its key step comprises successively: joint face processing cleaning, application intermediate materials, assembling clamp, eddy-current heating, and intermediate materials is dissolved, and realize that the joint face liquid-phase diffusion welding connects; This method is a kind of soldering tech, and two connectors do not melt, but realizes connecting by the liquid phase diffusion of solder fusing, and its property of welded joint is limited, and its engineering range of application is limited to.Chinese patent ZL00123310.6 disclosed " method of attachment of thin-wall stainless steel welded pipe and implement the attaching parts of this method ", this method is the outer tube of interface peripheral hardware at the bonding pipe of two velamens,, with adhesive pipe is coupled together by it.In order to construct and the interim needs of open pipe line newly, not isometrical disjunctor pipe collar and T type reducing hoop formula pipe joint have also been designed in this invention, this method is the method that a kind of gluing connects, it or not the technology of metal molten welding, the intensity and the mechanical performance of its gluded joint are affected, and its engineering is used and is restricted.
Summary of the invention
At existing solder technology above shortcomings, the purpose of this invention is to provide and a kind ofly reduce weld defect, particularly reduce the sensitiveness of joint weld crack, reduce cost, break through common solder technology and can not satisfy the joint performance requirement, improve the welding method of the stainless steel thin walled pipe circular seam joint of welding quality.
Another object of the present invention provides a kind of welder of stainless steel thin walled pipe circular seam joint simple in structure, easy to use.
The object of the present invention is achieved like this: the welding method of stainless steel thin walled pipe circular seam joint, use the non-melt pole pulse inert gas protection solder technology that adds vertical electromagnetic field, and realize stainless steel thin walled pipe circular seam joint is welded; Comprise the steps:
1) the cleaning welding point is removed oxide, flying dust, greasy dirt and other impurity, keeps joint clean and dry;
2) adopt piece-holder and rotating mechanism that the stainless-steel thin-wall pipe workpiece joints is carried out clamping, two of stainless-steel thin-wall pipe workpiece joints connects end face and is positioned at the air chamber that is full of inert gas, and welding point at the uniform velocity rotates;
3) employing adds the rotation of vertical electromagnetic field control welding arc, and the welding pool melt carried out electromagnetic agitation, change the welding temperature field distribution, the process of setting of control welding point, thereby facilitate the seam organization refinement, reduce segregation, reduce the sensitiveness of weld crack, the stainless-steel thin-wall pipe workpiece joints is carried out girth welding.
The welding method of described stainless steel thin walled pipe circular seam joint; employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, and the non-melt pole pulse inert gas protection welding of welding crackle is accurately controlled, do not had to realization stainless steel thin walled pipe circular seam joint fusion penetration.
The welding method of described stainless steel thin walled pipe circular seam joint; employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, realizes that stainless steel thin walled pipe circular seam joint, pick and alloy thin-wall pipe ring thereof sew up head, magnesium and alloy thin-wall pipe ring thereof and sew up the non-melt pole pulse inert gas protection welding that head, aluminium and alloy thin-wall pipe ring thereof sew up the molten thin walled pipe circular seam joint of head, titanium and alloy thereof.
The welding method of described stainless steel thin walled pipe circular seam joint, the described non-melt pole pulse inert gas that adds vertical two-way alternating impulse magnetic field is protected in the welding procedure, peak value of pulse welding current: 20～120A, pulse base value welding current: 1～20A, pulse frequency: 1～50Hz, pulse duration: 0.02～0.8s; Exciting current: 1～15A, excitation frequency: 4～20Hz; Tungsten electrode diameter: 0.8～4.0mm, thin-wall part thickness: 0.1～3mm, shield gas flow rate: 5～40L/min, speed of welding: 2～20cm/min.
Realize the welder of the stainless steel thin walled pipe circular seam joint of described welding method, it is characterized in that, comprise piece-holder and rotating mechanism, top, torch system, air chamber, the source of welding current and energizing apparatus, described energizing apparatus comprises magnet exciting coil and field power supply, magnet exciting coil is in air chamber, be positioned at the top of welded part joint welding position, magnet exciting coil is fixed on the torch system; Magnet exciting coil links to each other with torch system and is coaxial; Magnet exciting coil produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
Perhaps magnet exciting coil is positioned at the below of welded part joint welding position in air chamber, and magnet exciting coil is fixed in the bottom surface of air chamber; Magnet exciting coil is coaxial with torch system; Electromagnetic stirring exciting coil produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
Perhaps two magnet exciting coils are positioned at the above and below of welded part joint welding position simultaneously in air chamber, and magnet exciting coil is fixed in respectively on the bottom surface and torch system of air chamber, produce with welding torch coaxial add vertical electromagnetic agitation magnetic field.
The welder of described stainless steel thin walled pipe circular seam joint, described field power supply is an IGBT contravariant field power supply, provide power supply to magnet exciting coil, can produce two-way alternating impulse exciting current or DC excitation electric current or unidirectional pulse exciting current or AC excitation electric current; The pulse duration of exciting current, frequency, intensity and EDM Generator of Adjustable Duty Ratio joint, field power supply electric current 1～50A, field power supply pulse frequency 1～100Hz.
The welder of described stainless steel thin walled pipe circular seam joint, described magnet exciting coil has conducting magnet core; Described conducting magnet core is movably arranged in the magnet exciting coil, can its position in magnet exciting coil of free adjustment until all from coil, removing; The shape of described conducting magnet core end can be designed to funnel type, straight barrel type, pyramid type or curved face type, and the lower surface shape of conducting magnet core is shunk, so that the more concentrated weld seam that acts on of the magnetic line of force; Have water-cooling system in the conducting magnet core, make welding torch, conducting magnet core and magnet exciting coil all be in good working order.
The welder of described stainless steel thin walled pipe circular seam joint, torch system comprises air chamber plug, insulating materials rod, nozzle, ignition tip and the tungsten electrode of integral type, when magnet exciting coil is positioned at the top of welded part joint welding position, direct and torch system becomes one, and makes welding torch and magnet exciting coil keep state of insulation by insulating materials.
The welder of described stainless steel thin walled pipe circular seam joint, inert gas riddle in the air chamber, and the air sifter that improves the inert protective gas fluidised form, forms laminar flow regime good gas protection fluidised form is equipped with in the lower part of air chamber simultaneously, and steam vent is arranged at the bottom of air chamber.
The present invention utilizes this externally-applied magnetic field to carry out function composite by electromagnetic stirring, rotation with the control welding arc, the welding pool melt is fully stirred, improve the crystalline condition of welding pool metal, change the distribution (tissue, phase structure also can change) in welding process of setting and temperature field, impel the weld grain refinement, reduce chemical inhomogeneities, reduce the sensitiveness of pore and the sensitiveness of crackle; Reduce weld defect, formed quality weld.
Compared to existing technology, the present invention has following advantage:
1, the electromagnetic field that adds that the present invention uses is controlled non-melt pole inert gas shielding pulse welding method; provide exciting current by corresponding field power supply; generation adds vertical two-way alternating impulse electromagnetic field, realizes stainless-steel thin-wall pipe joint penetration high-quality welding accurately control, that do not have the welding defective.
2, the present invention adopts and adds electromagnetic field control non-melt pole inert gas shielding pulse welding procedure; the rotation of control welding arc; liquid metals melt in the welding pool is carried out electromagnetic agitation, change the distribution situation of field of welding temperature, controlled the process of setting of welding point; impel the weld grain refinement; reduce chemical inhomogeneities, reduce the sensitiveness of pore and the sensitiveness of crackle, finally reduced weld defect; reduce cost, improved weldquality.
3, the present invention can reduce joint welding deformation, weld crack, pore, be mingled with, weld defect such as lack of penetration, be used in the exigent Aero-Space of Welding on Properties of Welding Joint, nuclear industry field especially, reduced the harshness of material quality has been required and to the strictness restriction of welding procedure, be a kind of simple, practical and reliable welding method and welding equipment, production efficiency improves.
4, the present invention can realize that stainless steel thin walled pipe circular seam joint, pick and alloy thin-wall pipe ring thereof sew up head, magnesium and alloy thin-wall pipe ring thereof and sew up efficient, low-cost, high stability and the high-quality welding that head, aluminium and alloy thin-wall pipe ring thereof sew up the multiple material of the molten thin walled pipe circular seam joint of head, titanium and alloy thereof; Can satisfy the welding of the light-wall pipe girth joint joint of two thin-wall pipes, thin-wall pipe and a solid end plug, a thin-wall pipe and a heavy wall termination, the welding quality height, saved resource, reduced production cost, having broken through the strict demand that the traditional welding technology can not satisfy welding quality, is a kind of efficient, high-quality, low cost, high applicability, flawless solder technology and device.
Description of drawings
Fig. 1 is welding method of the present invention and device schematic diagram;
Fig. 2, Fig. 3 and Fig. 4 are respectively the profiles of three kinds of joint forms.
Among the figure, 1. welding work pieces joint; 2. piece-holder and rotating mechanism; 3. field power supply; 4. torch system; 5. magnet exciting coil; 6. air chamber plug; 7. tungsten electrode; 8. top; 9. air chamber; 10. the source of welding current; 11. conducting magnet core; 12. air sifter; 13. circumferential weld; 14. thin-wall pipe; 15. thin-wall pipe; 16. thin-wall pipe; 17. solid end plug; 18. thin-wall pipe; 19. heavy wall termination.
The specific embodiment
The welding method of stainless steel thin walled pipe circular seam joint is used the non-melt pole pulse inert gas protection solder technology that adds vertical electromagnetic field, realizes the welding to stainless steel thin walled pipe circular seam joint.Add the non-melt pole pulse inert gas protection welding condition in vertical two-way alternating impulse magnetic field by optimization; improve weldquality; weld defects such as eliminating and weld micro-crack, pore, be mingled with, be lack of penetration; the control welding deformation is realized the stainless steel thin walled pipe circular seam joint high quality welding.
The invention will be further described below in conjunction with embodiment and accompanying drawing.
One, the welding method of stainless steel thin walled pipe circular seam joint
The welding method of stainless steel thin walled pipe circular seam joint is used the non-melt pole pulse inert gas protection solder technology that adds vertical electromagnetic field, realizes stainless steel thin walled pipe circular seam joint is welded; Comprise the steps:
1) carefully clears up stainless steel welded joint, remove oxide, flying dust, greasy dirt and other impurity, keep joint clean and dry;
2) adopt piece-holder and 2 pairs of stainless-steel thin-wall pipe workpiece joints of rotating mechanism 1 to carry out clamping, two of stainless-steel thin-wall pipe welding work pieces joint 1 is connected end face be positioned at the air chamber 9 that is full of inert gas, welding point is at the uniform velocity rotation under the effect of piece-holder and rotating mechanism 2;
3) employing adds the rotation of vertical electromagnetic field control welding arc, and the welding pool melt carried out electromagnetic agitation, change the welding temperature field distribution, the process of setting of control welding point, thereby facilitate the seam organization refinement, reduce segregation, reduce the sensitiveness of weld crack, stainless-steel thin-wall pipe welding work pieces joint 1 is carried out girth welding.
The welding method of stainless steel thin walled pipe circular seam joint; employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, and the non-melt pole pulse inert gas protection welding of welding crackle is accurately controlled, do not had to realization stainless steel thin walled pipe circular seam joint fusion penetration.
The welding method of stainless steel thin walled pipe circular seam joint; employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, realizes that stainless steel thin walled pipe circular seam joint, pick and alloy thin-wall pipe ring thereof sew up head, magnesium and alloy thin-wall pipe ring thereof and sew up the non-melt pole pulse inert gas protection welding that head, aluminium and alloy thin-wall pipe ring thereof sew up the molten thin walled pipe circular seam joint of head, titanium and alloy thereof.
The welding method of stainless steel thin walled pipe circular seam joint, add in the non-melt pole pulse inert gas protection welding procedure in vertical two-way alternating impulse magnetic field, peak value of pulse welding current: 20～120A, pulse base value welding current: 1～20A, pulse frequency: 1～50Hz, pulse duration: 0.02～0.8s; Exciting current: 1～15A, excitation frequency: 4～20Hz; Tungsten electrode diameter: 0.8～4.0mm, thin-wall part thickness: 0.1～3mm, shield gas flow rate: 5～40L/min, speed of welding: 2～20cm/min.
Two, the welder of stainless steel thin walled pipe circular seam joint
As shown in Figure 1, the welder of stainless steel thin walled pipe circular seam joint comprises piece-holder and rotating mechanism 2, top 8, torch system 4, air chamber 9, the source of welding current 10 and energizing apparatus, and described energizing apparatus comprises magnet exciting coil 5 and field power supply 3; Magnet exciting coil 5 is in air chamber 9, and magnet exciting coil 5 can have three kinds of mounting means;
Three kinds of mounting means of magnet exciting coil 5 are as follows:
1) magnet exciting coil 5 is positioned at the top of welded part joint 1 welding position in air chamber 9, and magnet exciting coil 5 is fixed on the torch system 4; Magnet exciting coil 5 links to each other with torch system 4 and is coaxial; Magnet exciting coil 5 produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
Be provided with the clamping and locking mechanism that links to each other with torch-tip in the end of electromagnetic stirring exciting coil 5, it is fixed on magnet exciting coil 5 on the torch system 4, makes magnet exciting coil 5 and welding work pieces joint 1 that the free adjustment degree of certain distance be arranged.The Electromagnetic Control pulse welding that realizes different speeds of welding, gap and size reasonable applies mode;
Perhaps, electromagnetic stirring exciting coil 5 is directly become one with torch system 4, adopt insulating materials to make the outer wall of torch-tip 4 and the wire turn maintenance state of insulation of coil.
2) magnet exciting coil 5 is positioned at the below of welded part joint 1 welding position in air chamber 9, and magnet exciting coil 5 is fixed in the bottom surface of air chamber 9; Magnet exciting coil 5 is coaxial with torch system 4; Electromagnetic stirring exciting coil 5 produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
3) two magnet exciting coils 5 are positioned at the above and below of welded part joint 1 welding position simultaneously in air chamber 9, and magnet exciting coil 5 is fixed in respectively on the bottom surface and torch system 4 of air chamber 9, produce with welding torch coaxial add vertical electromagnetic agitation magnetic field.
The welder of stainless steel thin walled pipe circular seam joint, field power supply 3 are IGBT contravariant field power supply, and field power supply 3 can produce two-way alternating impulse exciting current or DC excitation electric current or unidirectional pulse exciting current or AC excitation electric current; The pulse duration of exciting current, frequency, intensity and EDM Generator of Adjustable Duty Ratio joint, field power supply electric current 1～50A, field power supply pulse frequency 1～100Hz.
The welder of stainless steel thin walled pipe circular seam joint, magnet exciting coil 5 also can have conducting magnet core 11; Described conducting magnet core 11 is movably arranged in the magnet exciting coil 5, can its position in magnet exciting coil of free adjustment until all from coil, removing; The shape of described conducting magnet core 11 ends can be designed to funnel type, straight barrel type, pyramid type or curved face type, and the lower surface shape of conducting magnet core 11 is shunk, so that the more concentrated weld seam that acts on of the magnetic line of force; Have water-cooling system in the conducting magnet core 11, make welding torch, conducting magnet core and magnet exciting coil all be in good working order.
The welder of stainless steel thin walled pipe circular seam joint, torch system 4 comprises air chamber plug 6, insulating materials rod, nozzle, ignition tip and the tungsten electrode 7 of integral type, when magnet exciting coil 5 is positioned at the top of welded part joint 1 welding position, direct and torch system 4 becomes one, and makes welding torch and magnet exciting coil 5 keep state of insulations by insulating materials.
The welder of stainless steel thin walled pipe circular seam joint, inert gas riddle in the air chamber 9, and the air sifter 12 that improves the inert protective gas fluidised form, forms laminar flow regime good gas protection fluidised form is equipped with in the lower part of air chamber 9 simultaneously, and steam vent is arranged at the bottom of air chamber 9.
Magnet exciting coil 5 provides power supply by field power supply 3, and magnet exciting coil 5 the most frequently used structures are axial symmetry cylindrical coil structure.The source of welding current 10 adopts the digital contravariant or the common source of welding current that can produce multiple waveform.
In welding process, be full of the inert protective gas composition in the air chamber 9, top 8 closely contact with welding work pieces joint 1 one ends, and rotate with welding work pieces joint 1.Piece-holder and rotating mechanism 2 adopt pneumatic automatic clamping and stepper motor driven rotary, but and free adjustment clamping force and rotating speed.
Three, the application of the welding method of stainless steel thin walled pipe circular seam joint of the present invention and device comprises:
Be used for the welding of the light-wall pipe girth joint joint of two thin-wall pipes 14,15, as Fig. 2;
Be used for the welding of the light-wall pipe girth joint joint of a thin-wall pipe 16 and a solid end plug 17, as Fig. 3;
Be used for the welding of the light-wall pipe girth joint joint of a thin-wall pipe 18 and a heavy wall termination 19, as Fig. 4;
Be used for the welding of following material:
Mild steel, steel alloy, special steel, other ferrous metal such as stainless steel or pipe line steel;
Pick and alloy-junction thereof, magnesium and alloy-junction thereof, aluminium and alloy-junction thereof or titanium and alloy-junction thereof.
The present invention can improve the crystalline condition of welding pool metal, changes the distribution (tissue, phase structure also can change) in welding process of setting and temperature field, impels the weld grain refinement, reduces chemical inhomogeneities, reduces the sensitiveness of pore and the sensitiveness of crackle; Reduce weld defect, formed quality weld.
Employing adds the new thermal source of non-melt pole pulse inert gas protection electric arc of vertical two-way alternating impulse magnetic field control; efficient, the high-quality of utilizing that this arc source had, with the characteristic of the accurate controllability of temperature, realize the welding process that efficient, low cost, high stability, the nothing of multiple material are welded defective and high-quality joint.
Four, specific embodiment:
Embodiment 1:
Referring to Fig. 3 or Fig. 4, wall thickness is 0.4～0.8mm, external diameter is the welding of the circular seam joint of the thin-wall pipe of austenitic stainless steel 0Cr18Ni10Ti of 8～12mm and solid end plug or heavy wall termination, the cleaning welding point, remove oxide, flying dust, greasy dirt and other impurity, keep joint clean and dry; Its welding condition is: peak value of pulse welding current: 45～75A, pulse base value welding current: 5～12A, weld pulse frequency: 15～25Hz, argon flow amount: 8～121/min, tungsten electrode diameter: 1.2～2.4mm, exciting current: 2～10A, excitation frequency: 3～20Hz, speed of welding: 2～10s/ week.
Embodiment 2:
Referring to Fig. 3, wall thickness is 0.6～0.9mm, and external diameter is the welding of the circular seam joint of the thin-wall pipe of Zr-4 pick alloy of 6～15mm and solid end plug, and the cleaning welding point is removed oxide, flying dust, greasy dirt and other impurity, keeps joint clean and dry; Its welding condition is: peak value of pulse welding current: 50～80A, pulse base value welding current: 8～20A, weld pulse frequency: 10～30Hz, argon flow amount: 12～20l/min, tungsten electrode diameter: 2.0～3.2mm, exciting current: 4～15A, excitation frequency: 5～20Hz, speed of welding: 4～15s/ week.
Embodiment 3:
Referring to Fig. 2, wall thickness is 0.7～1.0mm, and external diameter is the welding of the circular seam joint between two thin-wall pipes of magnesium alloy AZ61 of 6～10mm, and the cleaning welding point is removed oxide, flying dust, greasy dirt and other impurity, keeps joint clean and dry; Its welding condition is: square wave alternating-current welding current: 60～100A, argon flow amount: 8～20l/min, tungsten electrode diameter: 1.2～3.2mm, exciting current: 3～12A, excitation frequency: 4～16Hz, speed of welding: 3～12s/ week.
Embodiment 4:
Referring to Fig. 2, wall thickness is 0.6～1.2mm, and external diameter is the welding of the circular seam joint between two thin-wall pipes of aluminium alloy LF6 of 10～15mm, and the cleaning welding point is removed oxide, flying dust, greasy dirt and other impurity, keeps joint clean and dry; Its welding condition is: alternating-current pulse peak value welding current: 70～100A, pulse base value welding current: 40～50A, argon flow amount: 8～15l/min, tungsten electrode diameter: 1.0～3.2mm, exciting current: 3～18A, excitation frequency: 5～10Hz, speed of welding: 2～18s/ week.
According to actual welding object and material composition, take all factors into consideration the reasonable coupling of joint form and welding condition, and welding procedure is carried out system optimization, guarantee to obtain high-quality thin-walled girth welding joint.
Claims (7)
1. the welding method of stainless steel thin walled pipe circular seam joint is characterized in that, uses the non-melt pole pulse inert gas protection welding manner that adds vertical two-way alternating impulse magnetic field, realizes stainless steel thin walled pipe circular seam joint is welded; Comprise the steps:
1) the cleaning welding point is removed oxide, flying dust, greasy dirt and other impurity, keeps joint clean and dry;
2) adopt piece-holder and rotating mechanism (2) that stainless-steel thin-wall pipe workpiece joints (1) is carried out clamping, two of stainless-steel thin-wall pipe workpiece joints (1) is connected end face be positioned at the air chamber (9) that is full of inert gas, welding point is at the uniform velocity rotation under the effect of piece-holder and rotating mechanism (2);
3) employing adds the rotation of vertical electromagnetic field control welding arc, and the welding pool melt carried out electromagnetic agitation, change the welding temperature field distribution, the process of setting of control welding point, thereby facilitate the seam organization refinement, reduce segregation, reduce the sensitiveness of weld crack, stainless-steel thin-wall pipe workpiece joints (1) is carried out girth welding;
Employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, and the non-melt pole pulse inert gas protection welding of welding crackle is accurately controlled, do not had to realization stainless steel thin walled pipe circular seam joint fusion penetration;
The described non-melt pole pulse inert gas that adds vertical two-way alternating impulse magnetic field is protected in the welding procedure, peak value of pulse welding current: 20～120A, pulse base value welding current: 1～20A, pulse frequency: 1～50Hz, pulse duration: 0.02～0.8s; Exciting current: 1～15A, excitation frequency: 4～20Hz; Tungsten electrode diameter: 0.8～4.0mm, thin-wall part thickness: 0.1～3mm, shield gas flow rate: 5～40L/min, speed of welding: 2～20cm/min.
2. the welding method of stainless steel thin walled pipe circular seam joint according to claim 1; it is characterized in that; employing adds the non-melt pole pulse inert gas protection welding manner in vertical two-way alternating impulse magnetic field, realizes that stainless steel thin walled pipe circular seam joint, zirconium and alloy thin-wall pipe ring thereof sew up head, magnesium and alloy thin-wall pipe ring thereof and sew up the non-melt pole pulse inert gas protection welding that head, aluminium and alloy thin-wall pipe ring thereof sew up the molten thin walled pipe circular seam joint of head, titanium and alloy thereof.
3. the welder of a stainless steel thin walled pipe circular seam joint, it is characterized in that, comprise piece-holder and rotating mechanism (2), top (8), torch system (4), air chamber (9), the source of welding current (10) and energizing apparatus, described energizing apparatus comprises magnet exciting coil (5) and field power supply (3), magnet exciting coil (5) is in air chamber (9), be positioned at the top of welded part joint (1) welding position, magnet exciting coil (5) is fixed on the torch system (4); Magnet exciting coil (5) links to each other with torch system (4) and is coaxial; Magnet exciting coil (5) produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
Perhaps magnet exciting coil (5) is positioned at the below of welded part joint (1) welding position in air chamber (9), and magnet exciting coil (5) is fixed in the bottom surface of air chamber (9); Magnet exciting coil (5) is coaxial with torch system (4); Electromagnetic stirring exciting coil (5) produce with welding torch coaxial add vertical electromagnetic agitation magnetic field;
Perhaps two magnet exciting coils (5) are in air chamber (9), be positioned at the above and below of welded part joint (1) welding position simultaneously, magnet exciting coil (5) is fixed in respectively on the bottom surface and torch system (4) of air chamber (9), produce with welding torch coaxial add vertical electromagnetic agitation magnetic field.
4. the welder of stainless steel thin walled pipe circular seam joint according to claim 3, it is characterized in that, described field power supply (3) is an IGBT contravariant field power supply, provide power supply to magnet exciting coil (5), can produce two-way alternating impulse exciting current or DC excitation electric current or unidirectional pulse exciting current or AC excitation electric current; The pulse duration of exciting current, frequency, intensity and EDM Generator of Adjustable Duty Ratio joint, field power supply electric current 1～50A, field power supply pulse frequency 1～100Hz.
5. the welder of stainless steel thin walled pipe circular seam joint according to claim 3 is characterized in that, described magnet exciting coil (5) has conducting magnet core (11); Described conducting magnet core (11) is movably arranged in the magnet exciting coil (5), can its position in magnet exciting coil of free adjustment until all from coil, removing; The shape of described conducting magnet core (11) end can be designed to funnel type, straight barrel type, pyramid type or curved face type, and the lower surface shape of conducting magnet core (11) is shunk, so that the more concentrated weld seam that acts on of the magnetic line of force; Conducting magnet core has water-cooling system in (11), makes welding torch, conducting magnet core and magnet exciting coil all be in good working order.
6. the welder of stainless steel thin walled pipe circular seam joint according to claim 3, it is characterized in that, torch system (4) comprises air chamber plug (6), insulating materials rod, nozzle, ignition tip and the tungsten electrode (7) of integral type, when magnet exciting coil (5) is positioned at the top of welded part joint (1) welding position, direct and torch system (4) becomes one, and makes welding torch and magnet exciting coil (5) keep state of insulation by insulating materials.
7. the welder of stainless steel thin walled pipe circular seam joint according to claim 3; it is characterized in that; inert gas riddles in the air chamber (9); the lower part of air chamber (9) is equipped with and is improved the inert protective gas fluidised form simultaneously; form the air sifter (12) of laminar flow regime good gas protection fluidised form, steam vent is arranged at the bottom of air chamber (9).
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| CN101767246B (en) * | 2010-01-04 | 2012-07-04 | 沈阳工业大学 | Device and method for improving TIG welding speed |
| CN102848058B (en) * | 2011-06-30 | 2015-10-28 | 宝山钢铁股份有限公司 | The method and apparatus of pulsed magnetic field refinement seam organization is used in welding process |
| CN102430836A (en) * | 2011-10-26 | 2012-05-02 | 铜陵有色建安钢构有限责任公司 | Welding method for thin-wall steel components |
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| CN115070171B (en) * | 2022-07-26 | 2023-09-29 | 中国科学院合肥物质科学研究院 | Welding method for improving strength of N50 armor weld joint |
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