A GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing device and a method of using the same

Abstract

The application discloses a GTAW narrow-gap magnetic control arc-hot-wire synchronous and asynchronous swing device. The device mainly comprises an electromagnetic coil, a magnetic pole, a conductive wire feeding pipe, a wire feeding pipe limiter, a welding wire limiter, an external constant current power supply, an insulating clamp and a welding gun main body. The application utilizes the transverse alternating magnetic field for deflecting the electric arc, and in the process of the magnetic control arc narrow-gap GTAW welding, direct current is passed through the welding wire, so that the electric welding wire swings laterally under the action of the ampere force. Since the electric arc and the electric welding wire are in the same magnetic field, the swing frequencies of the electric arc and the electric welding wire are the same. The swing direction of the welding wire is changed by changing the direct current passing direction of the welding wire, the synchronous and asynchronous swing of the electric arc and the welding wire is realized, the swing amplitude of the welding wire is controlled by the welding wire limiters of different specifications, the energy distribution in the groove is changed by the swing of the electric arc and the swing of the welding wire, the molten pool is promoted to flow, the molten pool is stirred, and the effect of refining the grains is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of narrow gap GTAW welding, in particular to the field of improving the sidewall fusion and microstructure control of narrow gap GTAW. BACKGROUND

[0002] In the field of thick plate welding, the GTAW narrow gap welding with magnetic control arc has the advantages of high quality and small welding deformation, and is often used for the welding of materials such as titanium alloy, nickel-based alloy and stainless steel. In the conventional GTAW welding with magnetic control arc, the swing arc is mainly used to eliminate the unfused defects. Although the swing arc can refine the grains to a certain extent, the refining effect is limited. The swing of the welding wire helps to refine the grains and suppress the element segregation. The combination of the magnetic control arc and the swing of the welding wire will further improve the microstructure control of the narrow gap welding. The synchronous swing of the welding wire and the arc can simultaneously act on one side of the narrow gap with the energy of the arc and the hot wire, so as to ensure that there is enough energy and filler metal at the root of the narrow gap, and effectively improve the sidewall fusion. The asynchronous swing of the welding wire and the arc can preheat the sidewall with the energy of the arc, and the alternating swing of the arc and the welding wire can promote the flow of the molten pool and refine the grains. How to realize the synchronous and asynchronous swing of the welding wire and the arc is a problem to be solved.

[0003] Therefore, a device for synchronous and asynchronous swing of welding wire and arc is invented. The welding wire is passed through direct current, and the transverse alternating magnetic field is used to deflect the arc. The energized welding wire swings transversely under the action of the Ampere force. Since the arc and the energized welding wire are in the same magnetic field, the swing frequency of the arc and the energized welding wire is the same. By changing the direction of the direct current passing through the welding wire to change the force direction of the welding wire, the synchronous and asynchronous swing of the arc and the welding wire is realized. Thus, the purpose of improving the weld formation and improving the joint performance is achieved while eliminating the unfused defects and increasing the fusion width. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a device for synchronous and asynchronous swing of GTAW narrow gap magnetic control arc-hot wire to solve the problems in the prior art.

[0005] According to the first aspect of the present application, a device for synchronous and asynchronous swing of GTAW narrow gap magnetic control arc-hot wire is provided, which comprises an electromagnetic coil, a magnetically conductive magnetic pole, a wire feeding tube limiter, a welding wire limiter, an external constant current power supply, an insulating clamp and a welding gun main body.

[0006] Preferably, the device for synchronous and asynchronous swing of GTAW narrow gap magnetic control arc-hot wire is characterized in that the magnetically conductive magnetic pole is tightly assembled with the electromagnetic coil, and is installed on the insulating clamp through threaded connection, and is located on one side of the welding gun main body.

[0007] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire feeding pipe limiter is fixed on one side of the magnetic pole, and is fixed and connected with the insulating clamp through threads after the position is determined.

[0008] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire feeding pipe passes through the wire feeding pipe limiter through a transition fit, and is fixed and adjusted through a screw after the position is determined.

[0009] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0010] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0011] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0012] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0013] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0014] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0015] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0016] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0017] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0018] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0019] Preferably, the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the wire limiter is installed at the lower end of the magnetic pole, and is fixed and connected through threads after the position is determined.

[0020] According to the second aspect of the present application, the use method of the GTAW narrow gap magnetic control electric arc-hot wire synchronous and asynchronous swing device is characterized in that the method comprises the following steps:

[0021] Step one: before the magnetic control arc-swing wire GTAW welding, check whether the electromagnetic coil can be normally started and the external stabilizing power supply, welding wire and the workpiece to be welded form a loop, and the wire feeding is smooth, then place the required welding plate in the appropriate position;

[0022] Step two: according to the rigidity of the material, select a reasonable length of the welding wire extending from the wire feeding tube;

[0023] Step three: turn on the power supply of the electromagnetic coil and make it work normally;

[0024] Step four: turn on the external stabilizing power supply and give the welding wire a direct current; observe the swing amplitude of the welding wire, which can be adjusted by the welding wire limiter; adjust the swing arc and swing wire frequency synchronously by adjusting the excitation current frequency;

[0025] Step five: use the direct current welding method, start the arc button to start the arc, and start the magnetic control arc-swing wire GTAW welding in the narrow gap groove;

[0026] Step six: after the narrow gap welding is completed, turn off the electromagnetic coil power switch and the external stabilizing power supply switch, and the magnetic control arc-swing wire GTAW welding is completed.

[0027] The device for GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swinging provided by the application is used for swinging the welding wire in the transverse direction under the action of the Ampere force by making the arc deflect in the transverse alternating magnetic field, and the swinging frequency of the welding wire is the same as that of the arc because the arc and the welding wire are in the same magnetic field, and the synchronous and asynchronous swinging of the arc and the welding wire is realized by changing the direction of the direct current flowing through the welding wire to change the force direction of the welding wire.

[0028] The device for GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swinging provided by the application is used for swinging the welding wire in the transverse direction under the action of the Ampere force by making the arc deflect in the transverse alternating magnetic field, and the swinging frequency of the welding wire is the same as that of the arc because the arc and the welding wire are in the same magnetic field, and the synchronous and asynchronous swinging of the arc and the welding wire is realized by changing the direction of the direct current flowing through the welding wire to change the force direction of the welding wire.

[0029] The device for GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swinging provided by the application is used for swinging the welding wire in the transverse direction under the action of the Ampere force by making the arc deflect in the transverse alternating magnetic field, and the swinging frequency of the welding wire is the same as that of the arc because the arc and the welding wire are in the same magnetic field, and the synchronous and asynchronous swinging of the arc and the welding wire is realized by changing the direction of the direct current flowing through the welding wire to change the force direction of the welding wire.

[0030] The device for GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swinging provided by the application is used for swinging the welding wire in the transverse direction under the action of the Ampere force by making the arc deflect in the transverse alternating magnetic field, and the swinging frequency of the welding wire is the same as that of the arc because the arc and the welding wire are in the same magnetic field, and the synchronous and asynchronous swinging of the arc and the welding wire is realized by changing the direction of the direct current flowing through the welding wire to change the force direction of the welding wire. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent from the following description of exemplary embodiments of the present application taken together with the accompanying drawings. In the drawings:

[0032] Figure 1 GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing device axis measurement drawing of the present application;

[0033] Figure 2 Three view of GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing device of the present application;

[0034] Figure 3 Arc and welding wire swing path schematic diagram of GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing device of the present application;

[0035] Figure 4 GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing welding molten pool liquid metal wetting and spreading on the surface of the substrate is affected by excitation frequency of the present application;

[0036] Figure 5 GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing weld grain refinement metallographic drawing of the present application. DETAILED DESCRIPTION

[0037] Various embodiments of the present application will be described hereinafter with reference to the accompanying drawings, in which like numerals and symbols denote like elements throughout the several views. Some portions of the detailed description which follows are presented in terms of procedures, logic blocks, processing, and other symbolic representations of operations on data bits that are stored within a computer memory. These descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. A skilled artisan will recognize the interchangeability of various hardware and software components through the use of appropriate software programs and / or computer logic.

[0038] Reference will now be made to Figure 1 and Figure 2The application provides a GTAW narrow-gap magnetic control electric arc-hot wire synchronous and asynchronous swinging device which comprises a welding gun body part 1, an electromagnetic coil 2, a magnetic pole 3, a welding wire limiter 4, a conductive wire feeding pipe 5, a wire feeding pipe limiter 6, an external constant current power supply 7 and an insulating clamp 8. In actual use, the electromagnetic coil 2 and the magnetic pole 3 are installed on the insulating clamp 8 through threaded connection and are located on one side of the welding gun body, the welding wire limiter 4 is installed on the bottom of the magnetic pole 3 through threaded connection, the wire feeding pipe limiter 6 is fixed on the insulating clamp 8 through threaded connection and is located on the same side of the magnetic pole 3, the conductive wire feeding pipe 5 passes through the wire feeding pipe limiter 6, the welding wire in the pipe extends out of the conductive wire feeding pipe 5 by a certain length, so that the deflection of the welding wire is reduced as much as possible and the welding wire can periodically move under the driving of the ampere force, one pole of the external constant current power supply 7 is clamped on the conductive wire feeding pipe 5, the other pole is connected with a workpiece, and the welding wire is ensured to be in close contact with the surface of the workpiece in the using process.

[0039] The specific use method of the GTAW narrow-gap magnetic control electric arc-hot wire synchronous and asynchronous swinging device is as follows: before the magnetic control electric arc-wire swinging GTAW welding is carried out, it is checked whether the electromagnetic coil 2 can be normally started and whether the external constant current power supply 7, the welding wire and the workpiece to be welded form a loop, whether the wire feeding is smooth, then the plate to be welded is placed in a suitable position, the length of the welding wire extending out of the conductive wire feeding pipe 5 is selected according to the rigidity of the material, the power supply of the electromagnetic coil 2 is turned on so that the electromagnetic coil 2 normally works, the external constant current power supply 7 is turned on to pre-pass direct current to the welding wire, the swinging amplitude of the welding wire is observed, the swinging amplitude of the welding wire can be adjusted through the welding wire limiter 4, the swinging electric arc and the swinging wire frequency are synchronously adjusted by adjusting the excitation current frequency, the direct current welding method is adopted, the arc starting button is started to start the arc, and the magnetic control electric arc-wire swinging GTAW welding in the narrow-gap groove is started, after the narrow-gap welding is completed, the power switch of the electromagnetic coil 2 and the switch of the external constant current power supply 7 are turned off, and the magnetic control electric arc-wire swinging GTAW welding is ended.

[0040] Reference Figure 3 In the magnetic control electric arc-wire swinging GTAW welding process, under the narrow-gap groove 8 environment, the magnetic pole generates a periodic magnetic field by loading an alternating excitation current on the electromagnetic coil, the magnetic field size is controlled by the excitation current, and the periodic change of the magnetic field is controlled by the excitation frequency. Because the electric arc 9 and the welding wire 10 are in the same magnetic field, the swinging frequencies of the electric arc 9 and the welding wire 10 are the same, the synchronous and asynchronous swinging of the electric arc 9 and the welding wire 10 is realized by changing the direction of the direct current passing through the welding wire through the external constant current power supply 7.

[0041] In order to verify the effect of the magnetic control wire swinging device and method, the following experiments are carried out.

[0042] Example 1

[0043] The plate fixed-point spot welding mode is used to verify the influence of the magnetic control hot wire mode on joint forming. The 316L stainless steel welding wire with a diameter of 1.2 mm is used, the length of the welding wire extending out of the conductive wire feeder is 60 mm, the length of the welding wire extending out of the wire limiter is 30 mm, the tungsten electrode height is 4 mm, the welding wire and tungsten electrode angle is 60°, the welding wire pre-current is 80 A, the wire feeding speed is 1.8 m / min, the electromagnetic coil excitation current is 2 A, the excitation frequency is 20 Hz, the wire limiter is used for limiting, and the generated welding wire end swing distance is 4.0 mm.

[0044] The welding wire is used in the pre-positioned wire feeding mode, the welding protective gas is pure Ar, and the gas flow rate is 15 L / min.

[0045] The direct current positive connection mode is used, the welding current is 100 A, and the welding time is 5 s. Referring to Figure 4 , the periodic transverse swing of the welding wire and the arc can improve the wet spreading of the molten pool liquid metal on the substrate surface, and the weld width increases with the increase of the electromagnetic action frequency, from 5.9 mm to 9.7 mm.

[0046] Example 2:

[0047] The single-pass wire feeding mode is used to verify the influence of the swing welding wire on the weld grain size. The 316L stainless steel welding wire with a diameter of 1.2 mm is used, the length of the welding wire extending out of the conductive wire feeder is 60 mm, the length of the welding wire extending out of the wire limiter is 30 mm, the tungsten electrode height is 4 mm, the welding wire and tungsten electrode angle is 60°, the welding wire pre-current is 80 A, and the wire feeding speed is 3 m / min. The electromagnetic coil excitation current is 4 A, the excitation frequency is 30 Hz, the wire limiter is used for limiting, and the generated welding wire end swing distance is 4.0 mm.

[0048] The welding wire is used in the pre-positioned wire feeding mode, the welding protective gas is pure Ar, and the gas flow rate is 15 L / min.

[0049] The direct current positive connection mode is used, the welding current is 220 A, and the welding speed is 1.2 m / min. Referring to Figure 5 , the weld fusion zone center position structure (a without welding wire swing, b with welding wire swing), the grain is changed from dendritic to cellular grain by applying the welding wire swing, and the grain refinement effect is obvious.

[0050] Finally, it should be noted that: obviously, the above examples are only examples for clearly illustrating the present application, and are not limitations on the embodiments; on the basis of the above description, other different forms of changes or variations can also be made by those skilled in the art, which do not need to be or cannot be exhaustively enumerated all the embodiments, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A GTAW narrow gap magnetic control arc-hot wire homo-hetero swing device, characterized in that, The device comprises an electromagnetic coil, a magnetic pole, a wire feeding tube limiter, a welding wire limiter, an external constant current power supply, an insulation clamp and a welding torch body; in the process of magnetic control arc narrow gap GTAW welding, direct current is passed through the welding wire, and the welding wire swings laterally under the action of Ampere force with the help of a transverse alternating magnetic field; because the arc and the welding wire are in the same magnetic field, the swing frequency of the two is the same; the swing direction of the welding wire is changed by changing the direction of the direct current passed through the welding wire, and the synchronous swing of the arc and the welding wire is realized; wherein: the excitation current of the transverse alternating magnetic field is 2-6 A, the excitation frequency is 20-30 Hz, the diameter of the welding wire is 0.8-1.6 mm, the length of the welding wire extending out of the wire feeding tube is 50-100 mm, the length of the welding wire extending out of the wire limiter is 30 mm, the direct current passed through the welding wire is 40-120 A, and the welding direct current is 100 A-300 A; The magnetic pole and the electromagnetic coil are tightly assembled in interference fit and are installed on the insulation clamp through threaded connection and are located on one side of the welding torch body; The wire feeding tube limiter is fixed on one side of the magnetic pole and is connected and fixed with the insulation clamp through threads after the position is determined; The wire feeding tube passes through the wire feeding tube limiter through transition fit and is adjusted and fixed through screws after the position is determined; The wire limiter is installed at the lower end of the magnetic pole and is connected and fixed through threads after the position is determined; The standby welding wire passes through the wire feeding tube and the wire limiter, the end of the welding wire is in contact with the surface of the standby workpiece and is located directly below the tungsten electrode; One pole of the external constant current power supply is clamped on the outer wall of the wire feeding tube through a small conductive clamp, the other pole is connected with the standby workpiece to form a loop.

2. A GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous swing device according to claim 1, characterized in that, The height of the tungsten electrode is 3-6 mm, and the angle between the welding wire and the tungsten electrode is 30-90° and is adjustable.

3. The GTAW narrow gap magnetic control arc-hot wire synchronous and asynchronous oscillation device of claim 1, wherein, The swing range of the welding wire end adjusted by the wire limiter is 0-6 mm.

4. The method of using a GTAW narrow gap magnetic control arc-hot wire homo-hetero swing device according to claim 1, characterized in that, The method comprises the following steps: Step one: before the magnetic control arc-swinging wire GTAW welding is performed, it is checked whether the electromagnetic coil can be normally started and whether the external constant current power supply, the welding wire and the workpiece to be welded form a loop, whether the wire feeding is smooth, and then the plate to be welded is placed at a proper position; Step two: according to the rigidity of the material, the length of the welding wire extending out of the conductive wire feeding tube is selected; Step three: the power supply of the electromagnetic coil is turned on to make it work normally; Step four: the external constant current power supply is turned on to pass direct current through the welding wire; the swing amplitude of the welding wire is observed, and the swing amplitude of the welding wire can be adjusted through the wire limiter; the swing arc and the swing wire frequency are adjusted synchronously by adjusting the excitation current frequency; Step five: the direct current welding method is adopted, the arc starting button is started to start the arc, and the magnetic control arc-swinging wire GTAW welding in the narrow gap groove is started; Step six: after the narrow gap welding is completed, the electromagnetic coil power supply switch and the external constant current power supply switch are turned off, and the magnetic control arc-swinging wire GTAW welding is completed.

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