CN111922492A - A magnetic field-assisted integrated hot wire submerged arc welding device - Google Patents

Abstract

The invention belongs to the technical field of welding equipment, in particular to a multi-wire submerged arc welding equipment. An integrated hot wire submerged arc welding device assisted by a magnetic field includes a main gun body and an auxiliary gun body, the auxiliary gun body is arranged at the rear end of the main gun body, and is used for feeding welding wire into the main gun body. Three wire feeding tubes are arranged in parallel along the direction of the welding bead in the body; the first welding wire, the second welding wire and the third welding wire are respectively arranged in the three wire feeding tubes; wherein the first welding wire and the second welding wire are respectively connected with the arc starting power source for connecting with the arc starting power source. The workpiece starts arcing; the third welding wire is connected to the auxiliary power source, and after being heated by the auxiliary power source, it is used to fill the welding seam; the front end of the main gun body is provided with a nozzle. The whole welding device of the invention has a small size, and the arc formed by the three wires forms a coupled arc under the action of an external magnetic field, which can significantly reduce the heat input in the welding process and at the same time improve the welding seam deposition rate, refine the crystal grains, and reduce the burning of alloy elements. It reduces the internal stress of the weld, avoids welding deformation, significantly improves the overall strength and toughness of the weld, and obtains the ideal aspect ratio weld.

Description

A magnetic field-assisted integrated hot wire submerged arc welding device

technical field

The invention belongs to the technical field of welding equipment, in particular to a multi-wire submerged arc welding equipment.

Background technique

Submerged arc welding is a welding method in which the arc burns under the flux layer. It is favored by large enterprises at home and abroad because of a series of advantages such as high production efficiency, high welding seam quality, small welding deformation, no arc light and less smoke and dust. It is suitable for welding of low carbon steel, low alloy steel, stainless steel and nickel-based alloys in the fields of pressure vessels, railway vehicles, and heavy machinery. In recent years, domestic and foreign welding scholars have studied a variety of high-efficiency and high-quality welding methods, but they have not had a great impact on the application field of submerged arc welding.

Up to now, more and more welding materials such as steel plates over 80mm have been used in the actual industry. Although the original single-wire submerged arc welding and double-wire submerged arc welding can realize the connection of thick plates, the multi-layer and multi-channel thick plates The large amount of heat input caused by welding makes the grains of the weld structure coarse, which affects the mechanical properties of the joint. Multi-wire submerged arc welding refers to a submerged arc welding method that uses two or more wires at the same time to complete a weld. Compared with single-wire submerged arc welding and double-wire submerged arc welding, it is characterized in that the required energy is distributed to different parts during welding. Therefore, the welding bead can be formed at one time by using thinner welding wire, smaller welding current and larger welding speed. In the actual welding process, the required shape and size of the weld can be obtained by adjusting the arrangement of the welding wires, the distance between the welding wires, the inclination angle of the welding wire and the arc power.

Integrated Cold Wire Submerged Arc Welding (ICE ^TM ) involves inserting a cold wire between two parallel hot wires and using the excess heat of the hot wires to melt the wire. when welding. The two hot wires are fed by a DC motor at the same speed, and the cold wires are fed by an independent wire feeder, and the feeding speed of the cold wires can be independently controlled. The method can greatly improve the welding production efficiency, increase the welding speed, reduce the flux consumption, and realize high-efficiency, high-quality and low-cost welding. However, the core technology of this method is limited by foreign countries, and the equipment cost is high. In addition, for larger thick plates, the cold wire consumes part of the welding heat input, resulting in the welding process still requiring multiple layers and multiple passes, reducing the welding efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a new type of submerged arc welding equipment. The equipment adds a welding wire that is not connected to the main power source behind the two welding wires connected to the main power source as a hot wire. The arc formed by the welding wire will preheat the rear welding wire, and the additional independent power source will heat the welding wire. The two high temperature synergistically melt the welding wire to realize the integrated hot wire function. The welding torch can achieve the minimum heat input under the same cladding efficiency. It reduces the deterioration of the weld structure due to high heat input, fast heating speed and local overheating of submerged arc welding. It is especially important for submerged arc welding of high current and rapid welding, which can significantly improve the mechanical properties of the joint structure and reduce the Weld deformation, improve product quality.

Realizing the integrated hot wire function, the welding torch can achieve the minimum heat input under the same cladding efficiency, reducing the deterioration of the weld structure caused by the high heat input, fast heating speed and local overheating of submerged arc welding. Submerged arc welding with high current and rapid welding is particularly important, which can significantly improve the mechanical properties of the joint structure, reduce the deformation of the weld, and improve the quality of the product.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: a magnetic field-assisted integrated hot wire submerged arc welding device, comprising a main gun body and an auxiliary gun body, the auxiliary gun body is arranged at the rear end of the main gun body, and is In order to feed the welding wire into the main gun body, three wire feeding tubes are arranged in parallel along the welding direction in the main gun body; the first welding wire, the second welding wire and the third welding wire are respectively in the three wire feeding tubes; The second welding wire is respectively connected with the arc starting power source for starting arc with the workpiece; the third welding wire is connected with the auxiliary power source, and after being heated by the auxiliary power source, it is used to fill the welding seam; the front end of the main gun body is provided with a nozzle.

As a preferred mode of the present invention, the first welding wire is connected to a DC power source.

As a preferred mode of the present invention, the second welding wire is connected to a pulsed AC power source.

As another preferred mode of the present invention, a magnetic field generating device is provided on the outer side of the front part of the main gun body; the magnetic field generating device is connected to the AC power supply, and changes the deflection direction of the first welding wire arc through periodic changes in the direction of the magnetic field .

Further preferably, the wire feeding tube of the third welding wire is a ceramic wire feeding tube; the ceramic wire feeding tube is provided with a hollow structure.

Further preferably, the third welding wire is connected to the auxiliary power source through a hot wire electrode, and the hot wire electrode enters the hollow structure and contacts the third welding wire in the ceramic wire feeding tube, and the connection between the two conductive blocks of the hot wire electrode is opposite. The welding wire in between is heated.

As a preferred mode of the present invention, the wire feeding tubes of the first welding wire and the second welding wire are copper wire feeding tubes, and the arc starting power source transfers the welding current to the welding wire in the tube through the electrode block contacting the tube wall of the copper wire feeding tube.

As a preferred mode of the present invention, the auxiliary gun body includes a wire feeding mechanism and a wire feeding hose, the wire feeding hose is connected to the ends of the three wire feeding tubes, and the wire feeding mechanism passes the wire feeding soft The tube feeds the three welding wires into the three wire feed tubes respectively.

Further preferably, the wire feeding mechanism is composed of three sets of wire feeding planetary wheels, and the three sets of wire feeding planetary wheels are arranged at equal distances from each other.

As a preferred mode of the present invention, an arc stabilizer is provided inside the nozzle.

Compared with the traditional submerged arc welding torch, the beneficial effects of the present invention are as follows:

(1) The whole set of welding device is small in size, which can realize welding of large and thick plates and narrow gaps, and each wire feeding device contains multiple cross planetary gears, which generate a forward feeding tension on the welding wire and ensure long-distance wire feeding. , to achieve effective welding over long distances.

(2) There are three welding arcs: the first welding wire arc, the second welding wire arc, and the third welding wire arc. The first welding wire arc generated by the DC power supply is located at the front end, and the keyhole workpiece obtains different depths of penetration, and will deflect under the action of an external magnetic field, so as to solve the problem of arc magnetic deflection and other problems, and through the size of the DC power supply and the direction of the magnetic field Change the deflection amplitude and deflection direction of the arc, and then control the effective area of arc welding, and successfully solve the key problems such as deep plate sidewall failure. The second welding wire arc generated by the pulse AC power supply in the middle mainly uses small current and high voltage to control the formation of the weld and control the penetration depth, and under the action of the external magnetic field, the middle wire forms a stable welding arc to obtain a smooth weld surface and improve the Weld forming. The third welding wire mainly plays the role of filling and covering. Under the preheating effect of the auxiliary power supply, the welding wire deposition speed is accelerated, the deposition area is increased, and the welding speed is improved.

(3) Under the action of an external magnetic field, the arc formed by the three wires forms a coupled arc, which significantly reduces the heat input during the welding process while improving the weld deposition rate, refining the grains, reducing the burning loss of alloying elements, and reducing the internal stress of the weld. , avoid welding deformation, significantly improve the overall strength and toughness of the weld, and obtain an ideal aspect ratio weld.

(4) For large and thick plates, due to the improvement of welding cladding efficiency and penetration depth, the number of welding layers is significantly reduced, thereby reducing flux consumption, and significantly reducing welding costs on the basis of obtaining a smooth weld surface.

Description of drawings

1 is a left side view of an integrated hot wire submerged arc welding device under the assistance of a magnetic field provided by an embodiment of the present invention;

2 is a three-dimensional perspective view of an integrated hot wire submerged arc welding device under the assistance of a magnetic field provided by an embodiment of the present invention;

3 is a half cross-sectional view of an integrated hot wire submerged arc welding device assisted by a magnetic field provided by an embodiment of the present invention;

4 is a three-dimensional schematic diagram (left front direction) of the internal structure of the integrated hot wire submerged arc welding device under the magnetic field assistance provided by the embodiment of the present invention;

FIG. 5 is a three-dimensional schematic diagram (rear right direction) of the internal structure of the integrated hot wire submerged arc welding device under the magnetic field assistance provided by the embodiment of the present invention;

Fig. 6 is the structural representation of the ceramic wire feeding tube;

Fig. 7 is the structural representation of insulating block;

8 is a three-dimensional perspective view of an insulating block;

9 is a schematic structural diagram of an insulating rubber pad;

Figure 10 is a schematic diagram of the structure of the hot wire electrode;

Figure 11 is a schematic structural diagram of an electrode block: a. DC electrode block, b. AC electrode block;

Figure 12 is a schematic diagram of the structure of the electromagnet shell;

Figure 13 is a schematic diagram of the structure of the electromagnet coil;

In the figure, 1. Nozzle; 2. Arc stabilizer; 3. Electrode insulating block; 4. Electromagnet shell; 5. Electromagnet control box; 6. Electromagnet coil; 7. Main gun body shell; 8. DC electrode block ; 9. AC electrode block; 10. Insulating rubber pad; 11. Hot wire electrode fixing block; 12. Hot wire electrode; 13. The first copper wire feeding tube; 14. The second copper wire feeding tube; 15. Ceramic wire feeding tube; 16. Main gun body tail end fixing block; 17. Auxiliary gun body shell; 18. Wire feeding hose fixing plate; 19. Cross planetary carrier plate; 20. Wire feeding hose; 21. Cross planetary gear; 22 . Hollow structure; 23. Conductive block; 24. Insulating rod.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

As described in the background art, in order to improve the welding deposition rate and reduce the welding heat input, the present invention adjusts the power supply of the hot wire, the wire is preheated by the auxiliary power supply after the arc is struck, and the temperature control system makes the heating process increase slowly, and There is gradient temperature compensation, which makes the arc striking process more stable; the magnetic field generated by the magnetic field generator with variable magnetic field direction affects the front and rear welding wires, improves the penetration depth and width, reduces the heat input, improves the cladding efficiency, and ensures The mechanical properties and appearance of the weld are improved, and the equipment is equipped with a cross planetary gear to solve the problem of unstable wire feeding over long distances, which further improves the quality of the weld.

One of the embodiments provided by the present invention is: an integrated hot wire submerged arc welding device assisted by a magnetic field, the external structure of which is shown in FIG. The auxiliary gun body II is fitted with the main gun body I through the fixing block at the end of the main gun body. The lower part of the front side of the main gun body I is provided with a magnetic field generating device for generating a magnetic field.

Referring to Figures 1 and 2, the auxiliary gun body II is located on the upper part of the main gun body I, including the auxiliary gun body shell 17 and the wire feeding hose 20 inside it, the wire feeding hose fixing plate 18, and three sets of cross planetary gears. and its related structures.

The auxiliary gun body shell 17 is made of two identical parts. The cross planet wheel carrier plate 19 is embedded in the uppermost groove, and the wire feeding hose fixing plate 18 is arranged in the groove below the cross planet wheel carrier plate 19. The auxiliary gun body The lowermost part of the casing 17 is connected to the main gun body I.

Referring to Figures 2, 3 and 4, the cross planetary gear carrier plate 19 is used to determine the mutual positions of the three groups of cross planetary gears 21. The cross planetary gear motor is fixed under the cross planetary gear carrier plate 19 through four positioning screws, The three groups of cross planet wheels 21 are arranged at equal distances from each other. Under the overall structure of the cross planetary gear 21, the wire feeding hose fixing plate 18 is separated by 8.7 mm, and is also fixed by the groove in the corresponding auxiliary gun body shell. The three wire threading holes on the upper surface of the wire feeding hose fixing plate 18 are funnel-shaped , which is parallel to the wire outlet hole of the cross planet wheel, and the bottom is a threaded hole for connecting the wire feeding hose 20. Below the wire feeding hose fixing plate 18 are three wire feeding tubes. The wire feeding tubes on both sides are respectively connected with the cross planetary wheel through the wire feeding hose 20, and the wire feeding tube in the middle directly penetrates the hole in the middle of the wire feeding tube fixing plate 18 to be connected with the cross planet wheel.

The wire feeding mechanism provides stability for the welding process and meets the needs of long-distance wire feeding. The welding wire enters the cross planetary gear reducer through the external wire feeding hose, passes through the internal structural parts of the cross planetary gear 21 in turn, and finally enters the wire feeding hose. Fixing plate 18, the straightened welding wire enters different wire feeding tubes through wire feeding hoses respectively.

Referring to Figures 2, 3, 4, and 5, the main gun body includes a main gun body shell 7 and an internal arc generation system and a hot wire system. The uppermost end of the main gun body shell 7 is provided with a main gun body tail end fixing block 16 . As the connecting parts of the main gun body and the auxiliary gun body, the protruding blocks on both sides of the fixing block 16 at the rear end of the main gun body are embedded in the corresponding grooves in the shell 17 of the auxiliary gun body. The vertical surface of the tail fixing block is provided with through holes for the three wire feed tubes to pass through and through holes for the passage of external power cables.

Three parallel wire feeding tubes are arranged in the main gun body shell 7 , which are a first copper wire feeding tube 13 , a second red copper wire feeding tube 14 and a ceramic wire feeding tube 15 respectively. The distance between the three wire feeding tubes is 13.75mm, wherein the first copper wire feeding tube 13 is responsible for transporting the first welding wire, the second copper wire feeding tube 14 is responsible for transporting the second welding wire, and the ceramic wire feeding tube 15 is responsible for transporting the third welding wire .

The first copper wire feeding tube 13 is connected to the DC power source through the DC electrode block 8 , and the second copper wire feeding tube 14 is connected to the pulse AC power source through the AC electrode block 9 . The ceramic wire feeding tube 15 is provided with a hollow structure 22 . As shown in FIG. 6 , the third welding wire is in contact with the hot wire electrode 12 through the hollow structure 22 . The insulating properties of the ceramic wire feed tube 15 prevent the auxiliary power supply from being short-circuited to the hot wire electrode 12 inside the welding gun, and at the same time, the welding wire between the positive and negative electrodes of the hot wire electrode 12 is heated by the welding wire resistance heat.

The front end of the main gun body casing 7 is the nozzle 1 . The arc stabilizer 2 with high temperature resistance and insulation is installed inside the nozzle 1. The welding wire entering the three wire feeding tubes will eventually be sent into the arc stabilizer 2, and the arc stabilizer 2 will stabilize the arc after the arc is started.

The three wire feed tubes pass through the main gun body tail end fixing block 16, the hot wire electrode fixing block 11, the insulating rubber pad 10, the electrode insulating block 3, and the arc stabilizer 2 sequentially from top to bottom. The above materials are all insulating materials. Make sure that the welding wire is not connected to the gun body.

The electrode insulating block 3 contains two grooves, as shown in FIG. 7 , for fixing the DC electrode block 8 and the AC electrode block 9 and preventing the electrodes from being electrically connected to the gun body. In the central area of the electrode insulating block 3, there is a hole for the three wire feeding tubes to pass through, as shown in FIG.

The structure of the insulating rubber pad 10 is shown in FIG. 9 , the top of which is the heating wire electrode fixing block 11 , the heating wire electrode fixing block 11 is placed in the groove inside the main gun body shell 7 , and the lower surface is on the insulating rubber pad 10 . Surface contact, the hot wire electrode fixing block 11 is provided with a groove matched with the hot wire electrode 12 for fixing the hot wire electrode 12 and insulating the hot wire electrode 12 from the gun body.

The middle of the hot wire electrode 12 is an insulating solid plastic rod 24, which is connected to the upper and lower conductive blocks 23 made of metal copper by screws. As shown in FIG. The lower conductive block, the current flows through the welding wire, and the welding wire between the two conductive blocks is preheated by resistance heat.

The DC electrode block 8 and the pulsed AC electrode block 9 fixed on the electrode insulating block 3 are in close contact with the first copper wire feeding tube 13 and the second copper wire feeding tube respectively, so as to ensure that the welding current is completely transmitted to the first welding wire and the second welding wire. superior. The structure of the DC electrode block 8 is similar to that of the AC electrode block. As shown in Figures 11a and 11b respectively, the U-shaped groove on the electrode block is closely attached to the outer wall of the copper wire feeding tube.

The third welding wire entering the ceramic wire feeding tube 15 contacts the hot wire electrode 12 through the hollowed out position on the ceramic wire feeding tube 15 after passing through the fixing block 16 at the rear end of the main gun body, and becomes a hot wire after being preheated by the auxiliary power supply. , and then pass through the hot wire electrode fixing block 11, insulating rubber pad 10, electrode insulating block 3, and arc stabilizer 2 in sequence in the ceramic wire feeding tube 15, and finally the preheated hot wire directly enters the molten pool made by the two welding wires in front. In the process, under the action of the arc heat generated by the main arc of the first welding wire, it melts into filler metal and participates in the welding reaction.

The nozzle 1 is fixed to the front end of the main gun body casing 7 by screws. An electromagnet control box 5 is fixed at the upper position where the main gun body casing 7 is connected to the nozzle 1 , and the electromagnet casing 4 is connected to the lower end, as shown in FIG. 12 , to protect the electromagnet coil 6 . The electromagnet coil 6 is located inside the electromagnet housing 4 , as shown in FIG. 13 , the electromagnet coil 6 is connected to an AC power source. After energization, the electromagnet coil 6 forms a left-right magnetic field in front of the first welding wire.

The electromagnet coil 6 always works during the whole welding process. By adjusting the parameters of the electromagnet control box 5, the arc generated by the first welding wire connected to the DC power source at the front end of the weld bead is controlled, and the frequency and direction of the arc swing are changed. The parameters of DC power supply change the amplitude of arc swing to ensure large welding width and high cladding efficiency.

The magnetic field-assisted integrated hot wire submerged arc welding device in this embodiment contains a first welding wire, a second welding wire, and a third welding wire (hot wire), and each welding wire is equipped with a separate welding power source. During welding, the three welding wires are arranged in parallel along the direction of the bead to realize welding along the welding direction. ) is usually inclined backward, presenting an angle of 30-80° with the workpiece, and the second welding wire is perpendicular to the workpiece for welding, and it can also present a certain angle with the workpiece.

The first welding wire is connected to the DC power source, the second welding wire is connected to the pulsed AC power source, and the third welding wire is connected to the auxiliary power source. The penetration depth of the welding seam is controlled by controlling the current of the first welding wire, the second welding wire plays the role of further increasing the penetration depth and improving the welding bead formation, and the third welding wire (hot wire) can preheat the welding wire through the auxiliary power supply, increasing The melting speed of the welding wire increases the welding speed. The auxiliary power supply can be either a DC power supply or an AC power supply.

The electromagnet coil 6 periodically changes the polarity of the electromagnet under the action of the AC power supply. The arc generated by the first welding wire in front realizes periodic deflection under the action of the magnetic field. The periodic left and right deflection of the arc is similar to the swing of the welding torch but directly affects the heat input of the welding area, which ensures that the current is not changed. The smaller the penetration depth, the larger the cladding area. By controlling the current strength of the electromagnet, the amplitude of the arc swing can be controlled, the effective area of the arc welding, the area of the weld zone and the heat-affected zone can be controlled, and the heat input in the refined grain can be reduced. There is a significant effect on the grain, and the problems of unsightly forming and reduced penetration caused by the first arc can be improved by the subsequent two welding wires.

The second welding wire in the middle mainly uses small current and high voltage to control the forming of the weld and further improve the penetration depth. Blow, when the welding wire is energized, the arc base value current is very small, which can only maintain the arc combustion, and the welding wire is energized to generate a magnetic field to generate ampere force to pull the arc, but the arc base value current is very small and cannot cause adverse effects on the base metal, so the middle The welding wire stabilizes the arc, obtains a smooth weld surface, and improves weld formation.

The third welding wire (hot wire) at the back, as the filler metal, increases the cladding area, and with the aid of an external power source, the welding wire melts fast enough, and the welding speed can be greatly improved, thereby reducing the actual welding process. The heat input reduces the burning loss of alloying elements, reduces the internal stress of the weld, refines the grains, and significantly improves the overall strength and toughness of the weld.

The magnetic field-assisted integrated hot wire submerged arc welding device in this embodiment improves the distribution of the welding temperature field under the action of an external magnetic field, forms an integrated coupled arc, and achieves high deposition rate welding with minimal heat input, avoiding the risk of The coarsening of the weld structure caused by the excessive heat input significantly improves the mechanical properties of the joint, reduces the deformation of the weld, and improves the quality of the weld joint. In addition, the advantages of the pulse mode are also applied, good arc ignition performance, heat input Small amount, good anti-porosity performance. The synergistic effect of the applied magnetic field and each arc is also particularly important, and the melting width and depth can be changed by controlling the arc shape without increasing the heat input.

Claims (10)

1. an integrated hot wire submerged arc welding device under the aid of a magnetic field, comprises a main gun body, an auxiliary gun body, and the auxiliary gun body is arranged at the rear end of the main gun body, for feeding welding wire into the main gun body, it is characterized in that: In the main gun body, three wire feeding tubes are arranged in parallel along the welding bead direction; the first welding wire, the second welding wire and the third welding wire are respectively arranged in the three wire feeding tubes; wherein the first welding wire and the second welding wire are respectively connected with the arc starting wire. The power supply is connected to start an arc with the workpiece; the third welding wire is connected to the auxiliary power supply, and after being heated by the auxiliary power supply, it is used to fill the welding seam; the front end of the main gun body is provided with a nozzle. 2 . The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 1 , wherein the first welding wire is connected to a DC power source. 3 . 3 . The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 1 , wherein the second welding wire is connected to a pulsed AC power source. 4 . 4. The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 2, characterized in that: the front outer side of the main gun body is provided with a magnetic field generating device; Periodic changes in the direction of the magnetic field change the deflection direction of the first wire arc. 5 . The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 1 , wherein the wire feeding tube of the third welding wire is a ceramic wire feeding tube; the ceramic wire feeding tube is provided with a hollow structure. 6 . 6 . The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 5 , wherein the third welding wire is connected to the auxiliary power source through a hot wire electrode, and the hot wire electrode enters the hollow structure and is connected to the auxiliary power source. 7 . The third wire in the ceramic wire feeder contacts and heats the wire passing between the two conductive blocks of the hot wire electrode. 7. The integrated hot wire submerged arc welding device under the aid of a magnetic field according to claim 1, is characterized in that: the wire feeding tubes of the first welding wire and the second welding wire are red copper wire feeding tubes, and the arc-starting power supply contacts the red copper wire feeding through the electrode block. The wire tube wall transfers the welding current to the wire inside the tube. 8. The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 1, wherein the auxiliary gun body comprises a wire feeding mechanism and a wire feeding hose, and the wire feeding hose is connected to three At the end of the wire feeding tube, the wire feeding mechanism sends the three welding wires into the three wire feeding tubes respectively through the wire feeding hose. 9. The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 8, wherein the wire feeding mechanism is composed of three groups of wire feeding planetary wheels, and the three groups of wire feeding planetary wheels are equidistant from each other arrangement. 10 . The integrated hot wire submerged arc welding device assisted by a magnetic field according to claim 9 , wherein an arc stabilizer is arranged in the nozzle. 11 .

Images