CN207593023U - A kind of roll overlaying welding gun based on electromagnetism swinging technique - Google Patents

Abstract

The utility model discloses a roll surfacing welding torch based on electromagnetic swing technology, which includes a welding torch body and an electromagnetic stirring device, the electromagnetic stirring device includes magnetic swing heads with the same structure and arranged symmetrically on the left and right sides of the welding torch body; The swing head includes a magnetic rod, an electromagnetic coil, a cooling pipe assembly and a magnetic pendulum shield. The magnetic rod is arranged longitudinally. The electromagnetic coil is spirally wound outside the magnetic rod and electrically connected to an external DC power supply. The cooling The pipe assembly is set on the upper end of the magnetic rod to cool down the magnetic rod. The magnetic pendulum shield is cylindrical in shape and is placed outside the electromagnetic coil to separate the electromagnetic coil from the outside world; the magnetic rod The lower end is provided with a magnetic permeable head inclined to the direction of the welding torch body. The welding gun uses electromagnetic force to strengthen the movement of molten metal in the liquid phase, thereby affecting the flow, heat transfer and migration process of molten metal during solidification, reducing dendrites, increasing equiaxed wafers, reducing component segregation, and improving the quality of the molten pool. .

Description

A Roll Surfacing Welding Gun Based on Electromagnetic Oscillating Technology

technical field

The utility model relates to a roller surfacing welding torch based on electromagnetic swing technology.

Background technique

As the key spare parts of the rolling mill, the roll consumes a lot in the rolling process, and the surfacing welding technology is an important manufacturing and maintenance method in the machinery manufacturing industry. When the roll is used to the limit of scrapping, the wear resistance of the roll is enhanced and the service life of the roll is extended by repairing. In the prior art, surfacing welding is usually used to repair rolls. Rolls repaired by surfacing welding have the advantages of low cost, long service life, and good use effect, and have obvious effects on promoting circular economy. Roll repair is mainly for large rolls, the weight of which generally ranges from tens of tons to more than 100 tons, and the maximum diameter of the roll can reach about 2m.

When the roll is surfacing, the following problems usually occur during the solidification of the molten pool:

(1) The crystallization direction and crystallization speed of the molten pool have a great influence on the welding quality, especially the formation of cracks, inclusions, pores and other defects;

(2) The influence of segregation in the process of weld crystallization on weld quality;

(3) The microstructure and properties of the secondary crystallization of the weld metal;

(4) The influence of inclusions in the weld on the quality of the weld;

(5) Metal impurities are not uniform, resulting in uneven surface metal impurities formed after the molten pool is cooled and solidified, which also causes uneven hardness on the surface of the molten pool, which affects the quality of the surfacing layer on the surface.

Utility model content

The purpose of this utility model is to solve the above technical problems and provide a roll surfacing welding gun based on electromagnetic swing technology. The welding gun uses electromagnetic force to strengthen the movement of molten metal in the liquid phase, thereby affecting the flow, transmission Heat and migration process, reduce dendrites, increase equiaxed wafers, reduce component segregation, and achieve the purpose of improving the quality of the molten pool.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

A roll surfacing welding torch based on electromagnetic swing technology, including a welding torch body, and an electromagnetic stirring device, the electromagnetic stirring device includes a magnetic swing head with the same structure and symmetrically arranged on the left and right sides of the welding torch body; the magnetic swing head includes a magnetically conductive Rod, electromagnetic coil, cooling pipe assembly and magnetic pendulum shield, the magnetic conducting rod is arranged longitudinally, the electromagnetic coil is helically wound outside the magnetic conducting rod, and is electrically connected with the external DC power supply, and the cooling pipe assembly is sleeved on The upper end of the magnetic rod is used to cool the magnetic rod. The magnetic pendulum shield is cylindrical in shape and is placed outside the electromagnetic coil to separate the electromagnetic coil from the outside world; the lower end of the magnetic rod is provided with a welding torch The magnetic head is inclined in the direction of the body.

Specifically, the cooling pipe assembly is a cooling water pipe spirally wound on the upper end of the magnetic conducting rod and connected to an external cooling water pump.

As another preferred solution, the cooling pipe assembly includes a cooling water buffer sleeve sleeved on the upper end of the magnetic conducting rod, a cooling pipe arranged in the middle of the magnetic conducting rod and communicated with the cooling water buffer sleeve, and a cooling pipe that passes through the cooling water buffer sleeve. The water outlet pipe extending downward to the lower part of the cooling pipe; the lower end of the water outlet pipe communicates with the cooling pipe, the upper end of the water outlet pipe communicates with the water outlet hose, and the cooling water buffer sleeve communicates with the cooling water pump.

Further, the lower end of the magnetic permeable head is lower than the torch body, and faces the roll surfacing weld pool.

Further, it also includes four fixing plates for installing the magnetic swing head, one side of the fixing plates is fixedly connected with the welding torch body, and the other side of the fixing plates is movably connected with the cooling water buffer sleeve.

Furthermore, the cooling water buffer sleeve is provided with studs for connecting with the fixing plate, and the positions corresponding to the studs on the fixing plate are provided with bar-shaped stud grooves, and the studs pass through the bar-shaped studs. The column groove is locked by matching nuts to realize the flexible connection between the fixed plate and the cooling water buffer sleeve.

Compared with the prior art, the utility model has the following beneficial effects:

The welding torch of the utility model is based on the existing welding torch, and an electromagnetic stirring device is added. The device can apply a certain strength magnetic field to the welding pool. , and change the current direction at the same time, so that the magnetic poles generated at the two ends of the left and right magnetic swing heads are constantly changing. Through this change of magnetic poles, the molten pool on the roll is stirred, which is based on electromagnetic induction and the interaction between the current-carrying molten metal and the magnetic field to generate electromagnetic force. Two basic laws, use electromagnetic force to strengthen the movement of molten metal in the molten pool, thereby affecting the flow, heat transfer and migration process of molten metal during solidification, reducing dendrites, increasing equiaxed wafers, reducing composition segregation, and improving the molten pool purpose of quality.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the magnetic pendulum head of the present invention.

Among them, the names corresponding to the reference signs are:

1-Welding gun body, 2-Magnetic swing head, 21-Magnetic rod, 22-Electromagnetic coil, 23-Cooling pipe assembly, 231-Cooling water buffer sleeve, 232-Cooling pipe, 233-Outlet pipe, 24-Magnetic pendulum guard Cover, 25-magnetic head, 3-fixed plate.

Detailed ways

The utility model will be further described below in conjunction with the description of the drawings and the embodiments, and the mode of the utility model includes but not limited to the following embodiments.

The purpose of this embodiment is to provide a roll surfacing welding torch based on electromagnetic swing technology, which is a new welding torch that can effectively improve the quality of the roll surfacing layer by combining the existing welding torch with electromagnetic swing technology, specifically Said, as shown in Figure 1, this welding torch comprises welding torch body 1 and electromagnetic stirring device, and described welding torch body 1 is the roller surfacing welding torch commonly used in the prior art, and electromagnetic stirring device then comprises identical structure and symmetrically arranged on welding torch body 1 around the magnetic swing head 2.

As shown in Figure 2, the magnetic pendulum head 2 includes a magnetic pendulum 21, an electromagnetic coil 22, a cooling pipe assembly 23 and a magnetic pendulum shield 24, the magnetic pendulum is arranged longitudinally, and the electromagnetic coil is helically wound on the magnetic pendulum outside the rod, and is electrically connected with an external DC power supply, so that the electromagnetic coil generates a magnetic field after conducting electricity; the cooling pipe assembly is sleeved on the upper end of the magnetic rod to cool the magnetic rod, and the magnetic pendulum shield is in the shape of a cylinder The body shape is arranged outside the electromagnetic coil to separate the electromagnetic coil from the outside world. In order to prevent the magnetic field from affecting the outside world, the magnetic pendulum shield is made of insulating material; The direction of the magnetically permeable head 25 is inclined, and the lower end of the magnetically permeable head 25 is lower than the torch body 1, and faces the roll surfacing weld pool, so as to provide a magnetic field for the roll surfacing weld pool, and then achieve the purpose of stirring the molten pool.

In detail, the cooling pipe assembly 23 can be a cooling water pipe spirally wound on the upper end of the magnetic conducting rod 21 and connected to an external cooling water pump, so as to achieve the purpose of locally cooling the magnetic conducting rod 21 . The cooling pipe assembly 23 can also be in the form of an assembly. As in this embodiment, the cooling pipe assembly 23 includes a cooling water buffer sleeve 231 sleeved on the upper end of the magnetic conducting rod, arranged in the middle of the magnetic conducting rod and The cooling pipe 232 communicated with the cooling water buffer sleeve, and the outlet pipe 233 extending downward to the lower part of the cooling pipe after passing through the cooling water buffer sleeve; the lower end of the outlet pipe 233 communicates with the cooling pipe 232, and the upper end of the outlet pipe communicates with the outlet hose , the cooling water buffer jacket communicates with the cooling water pump to achieve the purpose of cooling the magnetic bar 21 as a whole.

In addition, the welding torch of this embodiment also includes four fixing plates 3 for installing the magnetic swing head 2, and the four fixing plates are respectively located on the front and rear sides of the welding torch body 1, and the two fixing plates on the same side of the welding torch body are arranged symmetrically One side of the fixed plate is fixedly connected with the torch body 1, and the other side of the fixed plate is movably connected with the cooling water buffer sleeve 231. Wherein, the movable connection mode between the fixed plate and the cooling water buffer sleeve 231 is as follows: the cooling water buffer sleeve 231 is provided with studs for connecting with the fixed plate, and the positions corresponding to the studs on the fixed plate are provided with strips The stud groove, the stud is locked by the matching nut after passing through the strip stud groove, when the distance between the welding torch and the outer surface of the roll surfacing changes, the two magnetic swing heads 2 can be moved to the inside and outside Move (that is, change the position of the stud in the bar-shaped stud groove) to change the position of the intersection of the extension lines of the two magnetic heads 25, so that it can always be in the welding pool to achieve the purpose of stirring the pool.

In the submerged arc welding and submerged arc welding surfacing welding to which the welding torch of this embodiment is applied, there are several obvious effects:

(1) The electromagnetic stirring of the welding gun in this embodiment can effectively inhibit the formation of grain boundary ferrite and side lath ferrite, so that the proportion of intragranular acicular ferrite in the molten metal in the molten pool is greatly increased;

(2) The electromagnetic stirring of the welding gun in this embodiment can reduce the total number and volume fraction of non-metallic inclusions in the weld (surfacing weld), while the number of inclusions with a size between 0.2 and 0.6 μm increases, which promotes the formation of acicular ferrite;

(3) The electromagnetic stirring function of the welding torch of this embodiment can significantly increase the low-temperature impact toughness of the deposited metal;

(4) The application of the welding torch in this embodiment, combined with the above (1) and (2), can make the metal impurities in the surfacing welding pool more uniform, and then make the surface hardness formed after the molten pool is cooled and solidified uniform, so that the surfacing The welded roll will not crack or fall off during the rolling process, and the quality of the surfacing layer is better.

To sum up, the application of electromagnetic stirring device in the roll surfacing welding torch can effectively improve the performance of the surfacing metal surface, ensure the quality of the surfacing layer on the roll surface, and thus ensure the pass rate of the repaired roll. And, the welding torch of this embodiment can make the repair surfacing of large-scale cold-rolled roll possible (domestic basically also does not adopt surfacing welding repair technology to large-scale cold-rolled roll, and large-scale cold-rolled roll is as wear and tear, or replace new, or get The cost of repairing abroad is very high), which can greatly improve the processing strength of the manufacturer and create better benefits for the manufacturer.

The above-mentioned embodiment is only one of the preferred embodiments of the present utility model, and should not be used to limit the protection scope of the present utility model, but any modification or embellishment without substantive meaning made on the main design idea and spirit of the present utility model, If the technical problems it solves are still consistent with the utility model, they should all be included in the protection scope of the utility model.

Claims (6)

1. A roll surfacing welding torch based on electromagnetic swing technology, comprising a welding torch body (1), is characterized in that, also includes an electromagnetic stirring device, and said electromagnetic stirring device includes structures that are identical and symmetrically arranged on the left and right sides of the welding torch body (1) Magnetic pendulum head (2); Described magnetic pendulum head (2) comprises magnetic guide bar (21), electromagnetic coil (22), cooling pipe assembly (23) and magnetic pendulum shield (24), and described magnetic guide bar longitudinally Set, the electromagnetic coil is helically wound outside the magnetic rod and electrically connected to the external DC power supply, the cooling pipe assembly is sleeved on the upper end of the magnetic rod to cool the magnetic rod, and the magnetic pendulum shield as a whole It is in the shape of a cylinder and is covered outside the electromagnetic coil to isolate the electromagnetic coil from the outside world; the lower end of the magnetic guide rod (21) is provided with a magnetic guide head (25) inclined towards the direction of the welding torch body (1). 2. A roll surfacing welding gun based on electromagnetic swing technology according to claim 1, characterized in that the cooling pipe assembly (23) is helically wound on the upper end of the magnetic rod (21) and connected to the external cooling water pump cooling water pipes. 3. A roll surfacing welding gun based on electromagnetic swing technology according to claim 1, characterized in that, the cooling pipe assembly (23) includes a cooling water buffer sleeve (231) sleeved on the upper end of the magnetic rod, The cooling pipe (232) that is arranged in the middle of the magnetic bar and communicates with the cooling water buffer sleeve, and the outlet pipe (233) that extends downwards to the lower part of the cooling pipe after penetrating the cooling water buffer sleeve; the lower end of the outlet pipe (233) is connected to the The cooling pipe (232) is connected, the upper end of the water outlet pipe is connected with the water outlet hose, and the cooling water buffer sleeve is connected with the cooling water pump. 4. A roll surfacing welding torch based on electromagnetic swing technology according to claim 3, characterized in that the lower end of the magnetically permeable head (25) is lower than the welding torch body (1) and faces the roll surfacing weld pool. 5. A kind of roll surfacing welding torch based on electromagnetic swing technology according to claim 2 or 4, is characterized in that, also comprises four fixed plates (3) for installing magnetic swing head (2), said fixed One side of the plate is fixedly connected with the torch body (1), and the other side of the fixed plate is movably connected with the cooling water buffer sleeve (231). 6. A roll surfacing welding gun based on electromagnetic swing technology according to claim 5, characterized in that, the cooling water buffer sleeve (231) is provided with studs for connecting with the fixed plate, and the fixed plate The position corresponding to the stud is provided with a bar-shaped stud groove, and the stud is locked by a matching nut after passing through the bar-shaped stud groove, so as to realize the flexible connection between the fixed plate and the cooling water buffer sleeve.