Welding additive repairing device and method for assisting TIG wire swing through magnetic field

Abstract

The invention discloses a welding additive repairing device and method for magnetic field assisted TIG wire swinging, and relates to the technical field of equipment manufacturing, a welding device comprises a TIG welding gun, a welding power source, an excitation assembly and a wire feeding assembly; the TIG welding gun is connected with a welding power supply; the excitation assembly is arranged on the outer side of the TIG welding gun in a sleeving mode and provides a longitudinal magnetic field parallel to the TIG welding gun. The wire feeding assembly provides a welding wire for the welding gun and supplies current to the welding wire, the welding wire penetrates through a wire feeding clamp fixed to the welding gun, and a preset included angle is formed between the welding wire penetrating through the wire feeding clamp and the TIG welding gun; the wire feeding clamp is a sheet-shaped workpiece, a wire feeding hole is formed in the wire feeding clamp, the wire feeding hole in the width direction of the wire feeding clamp is a transverse key hole, and the wire feeding hole in the thickness direction of the wire feeding clamp is an inclined through hole. During welding, the welding wire reciprocates in the wire feeding hole in the width direction of the wire feeding clamp. By applying the longitudinal magnetic field, the stability of the welding arc is improved, meanwhile, periodic swing of the welding wire is achieved, and the efficiency and quality of welding additive repairing are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment manufacturing, and more particularly to a welding additive repair device and method for TIG wire swinging assisted by a magnetic field. Background Art

[0002] At present, compared with other welding heat sources, TIG welding heat source has high welding quality, stable welding process, and simple welding process, and is widely used in petrochemical, aerospace, hydropower and other fields. However, conventional TIG welding additive repair has low welding efficiency, so it is often criticized by the industry. With the rapid development and transformation and upgrading of the manufacturing industry, the demand for welding additive repair technology is also increasing. At the same time, as the service environment becomes more and more harsh, the requirements for the quality of welding additive repair are also getting higher and higher. Therefore, it is of great significance to research and develop new and efficient TIG welding additive repair technology.

[0003] Compared with the single TIG form, although hot wire TIG welding additive repair can significantly improve the cladding efficiency, the introduction of hot wire can easily cause the drift of the welding arc, which brings certain technical difficulties to the stable control of the welding process.

[0004] Therefore, how to improve the stability of hot wire TIG welding is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a welding additive repair device and method with magnetic field assisted TIG wire swing, which uses an electromagnetic field to stably control the hot wire TIG arc, thereby improving welding efficiency and greatly improving the welding metallurgical quality, as well as the service performance of the welded joint or additive repair part.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A welding additive repair device with magnetic field-assisted TIG wire swinging, comprising a TIG welding gun, a welding power source, an excitation assembly and a wire feeding assembly;

[0008] The TIG welding gun is connected to the welding power source; the excitation assembly is sleeved on the outside of the TIG welding gun to provide a longitudinal magnetic field parallel to the TIG welding gun; the wire feeding assembly provides welding wire to the welding gun and passes current through the welding wire, and the welding wire passes through the wire feeding clamp fixed on the welding gun, and the welding wire passing through the wire feeding clamp forms a preset angle with the TIG welding gun;

[0009] The wire feeding clamp is a sheet-shaped workpiece, and is provided with a wire feeding hole. The wire feeding hole along the width direction of the wire feeding clamp is a transverse key hole, and the wire feeding hole along the thickness direction of the wire feeding clamp is an oblique through hole. During welding, the welding wire moves back and forth in the wire feeding hole along the width direction of the wire feeding clamp.

[0010] Preferably, one end of the power output of the welding power source is connected to a TIG welding gun, and the other end of the power output is connected to a workpiece to be welded. The TIG welding gun is perpendicular to the welding surface of the workpiece.

[0011] Preferably, the excitation assembly includes a coil frame, an excitation coil wound on the coil frame, a cylindrical magnetic core attached to the inner wall of the coil frame, and an excitation power supply connected to the two output ends of the excitation coil; the magnetic core is sleeved on the outer side of the TIG welding gun barrel wall and is coaxially interference fit with the TIG welding gun. The direction of the magnetic lines of force generated by the excitation assembly is perpendicular to the welding surface of the workpiece, and the magnetic lines of force are guaranteed to be parallel to the TIG welding gun, and the conductive welding wire swings under the action of the magnetic lines of force.

[0012] Preferably, the magnetic core and the coil frame are effectively fitted and fixed by bolts; and the magnetic core and the handle of the TIG welding gun are coaxially fixed by a top screw.

[0013] Preferably, the magnetic permeable core is made of high magnetic permeability electrical pure iron material.

[0014] Preferably, the excitation coil is wound with copper enameled wire having a wire diameter of 1.2 to 2.4 mm, and the number of turns is 800 to 1500.

[0015] Preferably, the excitation power supply includes an AC output mode and a DC output mode, and the output current ranges from 0 to 50A; when the AC output mode is adopted, the AC waveform can be adjusted according to the welding requirements, and the alternating frequency range is 0 to 100Hz.

[0016] Preferably, the diameter of the tungsten electrode of the TIG welding gun ranges from 1.6 to 4 mm.

[0017] Preferably, the wire feeding clamp is provided with a mounting hole, and is fixed to a welding gun clamp fixed on the outside of the TIG welding gun through the mounting hole. The wire feeding clamp is parallel to the TIG welding gun and is vertically arranged. One end of the welding wire passes through the wire feeding hole and extends to the surface of the workpiece and contacts it, and ensures that the end of the welding wire is adjusted below the tungsten electrode of the TIG welding gun.

[0018] Preferably, the inclination angle α of the oblique through hole is an acute angle, which is the angle between the axial direction of the wire feeding hole and the thickness direction of the wire feeding clamp, and has a value of 15° to 60°; the length l of the transverse key hole has a value of 5-8 mm.

[0019] Preferably, the wire feeding assembly includes a welding wire straightener and a hot wire feeder; the hot wire feeder is loaded with welding wire, and current is passed through the welding wire to perform resistance heating on the welding wire, and the output welding wire is straightened by the welding wire straightener and then fed into the wire feeding hole of the wire feeding clamp; the power output at one end of the hot wire feeder is connected to the welding wire, and the power output at the other end is connected to the workpiece to be welded; when the excitation power supply selects the AC output mode, the hot wire feeder passes DC power to the welding wire, and when the excitation power supply selects the DC output mode, the hot wire feeder passes AC power to the welding wire.

[0020] Preferably, the hot wire feeder is connected to a power source to pass current through the welding wire for resistance heating.

[0021] Preferably, the preset angle β formed by the welding wire and the TIG welding gun is β=90°-α.

[0022] Preferably, the TIG welding gun is fixed on the welding robot, the excitation power supply and the welding power supply are respectively connected to the welding robot, and the power on and off and parameters are controlled by the control program loaded in the welding robot to realize automatic welding.

[0023] Preferably, the welding wire straightener comprises a plurality of groups of symmetrical U-shaped rollers, and the welding wire is straightened by being squeezed by the symmetrical U-shaped rollers. The U-shaped rollers are made of insulating material.

[0024] Preferably, the welding wire straightener further comprises a motor and a transmission belt, and a plurality of symmetrical U-shaped rollers are connected to the output shaft of the motor through the transmission belt, and the output shaft of the driving motor drives the U-shaped rollers to rotate synchronously. The motor can be connected to a welding robot to realize automatic control of the welding wire straightener.

[0025] A welding additive repair method with magnetic field assisted TIG wire swinging, comprising the following steps:

[0026] Step 1: Select the tungsten electrode of the TIG welding gun and the welding wire, and let one end of the welding wire output by the wire feeding assembly pass through the wire feeding clamp and contact the workpiece to be welded;

[0027] Step 2: The excitation component generates a longitudinal magnetic field, the wire feeding component is powered on, and current is passed through the welding wire;

[0028] Step 3: Measure the magnetic field strength, adjust the current in the welding wire, and make the welding wire swing;

[0029] Step 4: Connect the TIG welding gun to the welding power source and start working.

[0030] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a welding additive repair device and method with magnetic field assisted TIG wire swing. During the hot wire TIG welding additive repair process, applying a longitudinal magnetic field can solve the working condition where the welding arc is unstable due to the introduction of welding wire current, and increase the rigidity of the arc. At the same time, when the magnetic field is coupled with the welding wire current, the periodic swing of the welding wire can be realized, which promotes the flow of the welding molten pool and intensifies the stirring of the molten pool, thereby refining the weld grains, uniformizing the alloy composition, improving the welding efficiency, and at the same time improving the metallurgical quality of the welding additive repair parts, thereby improving the service performance of the welding joints or additive repair parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a welding additive repair device with magnetic field-assisted TIG wire swing provided by the present invention;

[0033] Figure 2 A schematic diagram of the front view structure of the wire feeding clamp provided by the present invention;

[0034] Figure 3 A schematic diagram of the side structure of the wire feeding clamp provided by the present invention;

[0035] Figure 4 A schematic diagram of the relative position of the welding wire current and the magnetic field direction provided by the present invention;

[0036] Figure 5 A schematic diagram of the welding wire provided by the present invention swinging under a longitudinal magnetic field.

[0037] In the attached figure: 1-TIG welding gun, 2-welding gun clamp, 3-wire feeding clamp, 4-welding power supply, 5-excitation coil, 6-coil frame, 7-magnetic core, 8-excitation power supply, 9-welding wire, 10-welding wire straightener, 11-hot wire feeder, 12-workpiece. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The embodiment of the present invention discloses a welding additive repair device with magnetic field assisted TIG wire swing, such as Figure 1 As shown, it includes a TIG welding gun 1, a welding gun clamp 2, a wire feeding clamp 3, a welding power source 4, an excitation coil 5, a coil skeleton 6, a magnetic conductive core 7, an excitation power source 8, a welding wire 9, a welding wire straightener 10 and a hot wire feeder 11;

[0040] The excitation coil 5 is wound around the outside of the coil frame 6, and the magnetic core 7 is fixed to the inner wall of the coil frame 6 by bolts. The magnetic core 7 is also concentrically interference fit with the handle of the TIG welding gun 1 and fixed with a top screw.

[0041] The excitation coil 5 is connected to the excitation power supply 8 to form an electromagnet for generating a magnetic field, and the direction of the magnetic field lines is perpendicular to the surface of the workpiece 12;

[0042] The hot wire feeder 11 is loaded with welding wire, and current is passed through the welding wire 9 to perform resistance heating on the welding wire 9. The welding wire 9 output by the hot wire feeder 11 is straightened by the welding wire straightener 10. The straightened welding wire contacts the surface of the workpiece 12 after passing through the wire feeding clamp 3 with a transverse wire feeding hole. The power output at one end of the hot wire feeder is connected to the welding wire, and the power output at the other end is connected to the workpiece to be welded.

[0043] The wire feeding clamp 3 is fixed to the welding gun fixture 2 fixed to the outer wall of the TIG welding gun 1 by bolts.

[0044] Further, the structure of the wire feeding clamp 3 is as follows Figure 2-3 As shown, the wire feeding clamp 3 is a sheet-like workpiece provided with a wire feeding hole 31 and a mounting hole 32. It is fixed on the welding gun fixture 2 fixed on the outside of the TIG welding gun 1 through the mounting hole 32. The welding wire 9 passes through the wire feeding hole 31 and extends to the bottom of the tungsten electrode of the TIG welding gun; the wire feeding hole 31 is a transverse key hole, and the welding wire 9 reciprocates in the wire feeding hole 31 during welding; the wire feeding hole 31 along the width direction of the wire feeding clamp 3 is a transverse key hole, and the wire feeding hole 31 along the thickness direction of the wire feeding clamp 3 is an oblique through hole, and the welding wire 9 reciprocates in the wire feeding hole 31 along the width direction of the wire feeding clamp 3 during welding; the inclination angle α of the wire feeding hole 31 is an acute angle, and the inclination angle α is the angle between the axial direction of the wire feeding hole and the thickness direction of the wire feeding clamp, and the value is 15°~60°, so that the angle between the welding wire 9 and the surface of the workpiece 12 is α; the length l of the transverse key hole is 5~8mm.

[0045] Furthermore, the transverse key hole of the wire feeding hole is a keyway structure, and arc transition parts with a radius equal to 1.1-1.5 times the diameter of the welding wire are arranged at both ends in the length direction, so that the wire feeding hole is smooth, which is convenient for conveying, moving and welding the welding wire.

[0046] Furthermore, the angle between the longitudinal magnetic field lines of force generated by the current flowing through the welding wire 9 and the excitation assembly composed of the excitation coil 5, the coil frame 6, and the magnetic conductive core 7 is α, such as Figure 4 As shown in the figure, the vertical arrow indicates the direction of the magnetic field line. The preset angle β formed by the welding wire and the TIG welding gun is 90°-α.

[0047] Furthermore, the polarity of the output current of the excitation power supply 8 cannot be the same as the polarity of the current input to the hot wire feeder, that is, an alternating current and a straight current are used. The longitudinal magnetic field formed by the combination of the excitation power supply, the excitation coil and the magnetic core causes the energized welding wire to be subjected to the Ampere force, thereby generating a lateral swing of the welding wire, such as Figure 5As shown in the figure, the black dots represent the magnetic lines of force, and the dotted lines represent the wire swing position. The wire swing frequency is the same as the wire current frequency or the magnetic field frequency. When the magnetic field is an alternating magnetic field, the arc and the wire oscillate at the same frequency, intensifying the stirring and flow of the welding molten pool.

[0048] Furthermore, the welding wire straightener comprises a plurality of groups of symmetrical U-shaped rollers, and the welding wire is straightened by being squeezed by the symmetrical U-shaped rollers; the U-shaped rollers are made of insulating material.

[0049] Furthermore, the welding wire straightener also includes a motor and a transmission belt. Several groups of symmetrical U-shaped rollers are connected to the output shaft of the motor through the transmission belt, and the output shaft of the driving motor drives the U-shaped rollers to rotate synchronously.

[0050] Furthermore, the magnetic core is made of high magnetic permeability electrical pure iron material; the excitation coil is wound with copper enameled wire with a wire diameter of 1.2 to 2.4 mm, and the number of turns is 800 to 1500 turns.

[0051] Furthermore, the excitation power supply includes an AC output mode and a DC output mode, and the output current range is 0-50A; when the AC output mode is adopted, the AC waveform can be adjusted according to the welding requirements, and the alternating frequency range is 0-100Hz.

[0052] Furthermore, the diameter of the tungsten electrode of the TIG welding gun ranges from 1.6 to 4 mm.

[0053] On the other hand, in a specific embodiment, a magnetic field assisted TIG wire swing welding additive repair method comprises the following steps:

[0054] S1: Select the tungsten electrode of the TIG welding gun and the welding wire, and let one end of the welding wire output by the wire feeding assembly pass through the wire feeding clamp to contact the workpiece to be welded;

[0055] S2: The excitation component generates a longitudinal magnetic field, the wire feeding component is connected to the power supply, and the welding wire is fed with current;

[0056] S3: Measure the magnetic field strength, adjust the current in the welding wire, and make the welding wire swing;

[0057] S4: The TIG welding gun is connected to the welding power source and starts working.

[0058] On the other hand, in a specific embodiment, the TIG welding gun is fixed on the welding robot, the excitation power supply and the welding power supply are respectively connected to the welding robot, and the power supply on and off and parameters are controlled by the control program loaded in the welding robot to realize automatic welding. A magnetic field assisted TIG wire swing welding additive repair method includes the following steps:

[0059] S1: The TIG welding gun is fixed on the welding robot. According to the requirements of the welding process, the material to be welded is assembled, the tungsten electrode and welding wire diameter of appropriate diameter are selected, and the elongation of the welding wire is adjusted to make it contact with the surface of the workpiece to be welded;

[0060] S2: Check that the circuit connection is normal and ensure that the excitation power supply and welding power supply can work normally;

[0061] S3: Write and set welding programs for welding robots;

[0062] S4: According to the welding process requirements, adjust the parameters of the appropriate excitation power supply and the hot wire feeder. The power supply mode of the two is in the form of an alternating current and a straight current. Use a Gauss meter to measure the magnetic field strength of the arc space, adjust the size of the welding wire current in the hot wire feeder, and ensure the effective swing of the welding wire.

[0063] S5: The welding robot automatically executes the welding procedure, the excitation power supply and the welding power supply are started, and welding begins to perform efficient welding additive repair with the longitudinal magnetic field TIG oscillating welding wire;

[0064] S6: The welding program ends, the excitation power is turned off, the welding power is turned off, and the welding additive repair process ends.

[0065] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding additive repair device with magnetic field assisted TIG wire swing, characterized in that: Including TIG welding gun, welding power supply, excitation assembly and wire feeding assembly; The TIG welding gun is connected to the welding power source; the excitation assembly is sleeved on the outside of the TIG welding gun to provide a longitudinal magnetic field parallel to the TIG welding gun; the wire feeding assembly provides welding wire to the welding gun and passes current through the welding wire, and the welding wire passes through the wire feeding clamp fixed on the welding gun, and the welding wire passing through the wire feeding clamp forms a preset angle with the TIG welding gun; The wire feeding clamp is a sheet-shaped workpiece, and is provided with a wire feeding hole. The wire feeding hole along the width direction of the wire feeding clamp is a transverse key hole, and the wire feeding hole along the thickness direction of the wire feeding clamp is an oblique through hole. During welding, the welding wire moves back and forth in the wire feeding hole along the width direction of the wire feeding clamp.

2. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 1, characterized in that: One end of the welding power supply is connected to the TIG welding gun, and the other end is connected to the workpiece to be welded.

3. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 1, characterized in that: The excitation assembly includes a coil frame, an excitation coil wound on the coil frame, a magnetic core attached to the inner wall of the coil frame, and an excitation power supply connected to the two output ends of the excitation coil; the magnetic core is sleeved on the outside of the TIG welding gun and is coaxially interference fit with the TIG welding gun.

4. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 3 is characterized in that: The excitation power supply includes an AC output mode and a DC output mode. When the AC output mode is adopted, the AC waveform is adjustable.

5. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 2, characterized in that: The wire feeding clamp is provided with a mounting hole, and is fixed to a welding gun fixture fixed on the outside of the TIG welding gun through the mounting hole. One end of the welding wire passes through the wire feeding hole and extends to under the tungsten electrode of the TIG welding gun and contacts the surface of the workpiece.

6. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 4, characterized in that: The wire feeding assembly includes a welding wire straightener and a hot wire feeder; the hot wire feeder is loaded with welding wire, and current is passed through the welding wire to perform resistance heating on the welding wire. The output welding wire is straightened by the welding wire straightener and then sent to the wire feeding clamp; the power output at one end of the hot wire feeder is connected to the welding wire, and the power output at the other end is connected to the workpiece to be welded; when the excitation power supply selects the AC output mode, the hot wire feeder passes DC power to the welding wire, and when the excitation power supply selects the DC output mode, the hot wire feeder passes AC power to the welding wire.

7. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 1, characterized in that: The inclination angle α of the oblique through hole is an acute angle, and the inclination angle α is the angle between the axial direction of the wire feeding hole and the thickness direction of the wire feeding clamp; the preset angle β formed by the welding wire and the TIG welding gun is 90°-α.

8. The welding additive repair device with magnetic field assisted TIG wire swing according to claim 6, characterized in that: The welding wire straightener comprises a plurality of groups of symmetrical U-shaped rollers, and the welding wire is straightened by being squeezed by the symmetrical U-shaped rollers.

9. A welding additive repair method with magnetic field assisted TIG wire swing, characterized in that: A welding additive repair device with magnetic field assisted TIG wire swinging as claimed in any one of claims 1 to 8 comprises the following steps: Step 1: Select the tungsten electrode of the TIG welding gun and the welding wire, and let one end of the welding wire output by the wire feeding assembly pass through the wire feeding clamp and contact the workpiece to be welded; Step 2: The excitation component generates a longitudinal magnetic field, the wire feeding component is powered on, and current is passed through the welding wire; Step 3: Measure the magnetic field strength, adjust the current in the welding wire, and make the welding wire swing; Step 4: Connect the TIG welding gun to the welding power source and start working.

Images