Welding gun, manufacturing method using same, and metal material with stud and heat-resistant plate

Abstract

To provide a welding gun that can weld a stud, which is caused penetrate through a heat-resistant plate, onto a surface of a metal material, with minimal damage to the plate.SOLUTION: A heat-resistant plate has information on its surface, includes through-holes penetrating through its thickness, and has a nature to be attracted to magnets. A welding gun can fix the heat-resistant plate to a surface of a metal material by welding a stud penetrating through the through-hole onto the metal material surface. A magnet is provided on an outer circumference of the chuck's end for inserting the stud and at a position that enables attraction of the heat-resistant plate. The heat-resistant plate can be welded while keeping the heat resistant plate separated from the surface of the metal material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a welding gun, a manufacturing method using the same, and a metal material with a stud and a heat-resistant plate. [Background technology]

[0002] In the past, there were cases where lot numbers were written with paint or other marks on the surface of metal materials (for example, metals with poor surface conditions, metals whose display temperatures range from room temperature to high temperatures, metals that are subjected to post-processing heat treatment (-150 to 1700 degrees), etc.). This posed problems in terms of worker safety and work efficiency. Summary of the Invention [Problem to be solved by the invention]

[0003] To solve the above problems, a heat-resistant plate that functions as a tag or label may be attached. Specifically, one possible method is to insert a stud into a through-hole formed in the heat-resistant plate and then weld the stud to the surface of the metal material.

[0004] The inventors have found that when welding a stud to the surface of a metal material, the point of contact between the stud and the surface of the metal material becomes very hot due to the melting of the stud and / or the surface of the metal material, and that this heat can damage the heat-resistant plate.

[0005] The object of the present invention is to provide a welding gun that can weld a stud that has penetrated a heat-resistant plate to the surface of a metal material without substantially damaging the heat-resistant plate, a manufacturing method using the same, and a metal material with a stud and heat-resistant plate that can be obtained thereby. [Means for solving the problem]

[0006] The present invention includes the following (1) to (5). (1) A welding gun capable of fixing a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and a property of being attracted to a magnet to the surface of a metal material by welding a stud inserted into the through-hole to the surface of the metal material, A welding gun having a magnet on the outer periphery of the tip of the chuck into which the stud is inserted and in a position where it can attract the heat-resistant plate, and capable of welding while holding the heat-resistant plate separated from the surface of the metal material. (2) a preparation step of preparing a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and having the property of being attracted to a magnet, and a stud that can be passed through the through-hole, and inserting the stud into the chuck of the welding gun described in (1) above; a welding process in which the heat-resistant plate is attracted by the magnet to separate the heat-resistant plate from the surface of the metal material, and in that state, the stud is welded to the surface of the metal material using the welding gun described in (1) above; and A method for manufacturing a metal material with a stud and a heat-resistant plate, wherein the metal material has the heat-resistant plate fixed to the surface by welding the stud to the surface. (3) The method for manufacturing a metal material with a stud and a heat-resistant plate according to (2) above, wherein the stud has a flange whose outer diameter is larger than the diameter of the through hole of the heat-resistant plate. (4) A method for manufacturing a metal material with a stud and a heat-resistant plate according to (2) or (3) above, wherein the welding step is performed using a short cycle method. (5) a heat-resistant plate having information on its surface, through-holes penetrating in the thickness direction, and having the property of being attracted to a magnet; a stud penetrating the through hole; a metal material having the heat-resistant plate and the studs on a surface thereof; and The metal material with the stud and heat-resistant plate, wherein the tip of the stud that passes through the through hole of the heat-resistant plate is welded to the surface of the metal material, thereby fixing the heat-resistant plate so that it does not come off. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a welding gun that can weld a stud that has penetrated a heat-resistant plate to the surface of a metal material without substantially damaging the heat-resistant plate, a manufacturing method using the same, and a metal material with a stud and heat-resistant plate that can be obtained thereby. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic front view of a heat-resistant plate. [Figure 2] FIG. 2 shows one embodiment of a stud according to the present invention, where FIG. 2(a) is a schematic perspective view and FIG. 2(b) is a schematic cross-sectional view taken along a plane including the axis ω1. [Figure 3] FIG. 3 shows another embodiment of a stud according to the present invention, in which FIG. 3(a) is a schematic perspective view and FIG. 3(b) is a schematic cross-sectional view taken along a plane including the axis ω2. [Figure 4] FIG. 4 shows yet another embodiment of the stud of the present invention, where FIG. 4(a) is a schematic perspective view and FIG. 4(b) is a schematic cross-sectional view taken along a plane including the axis ω3. [Figure 5] FIG. 5 shows yet another embodiment of a stud according to the present invention, in which FIG. 5(a) is a schematic perspective view and FIG. 5(b) is a schematic cross-sectional view taken along a plane including the axis ω4. [Figure 6] FIG. 6 is a schematic side view showing an example of a welding gun used in the present invention. [Figure 7] FIG. 7 is a schematic side view showing the state in which a stud penetrating a heat-resistant plate is attached to the welding gun shown in FIG. 6 and pressed against the surface of a metal material. [Figure 8] FIG. 8 is a schematic partial cross-sectional view of the main body of the welding gun shown in FIGS. 6 and 7, showing the rest state before the trigger button (switch) is pressed. [Figure 9] FIG. 9 is a schematic partial cross-sectional view of the main body of the welding gun shown in FIGS. 6 and 7, showing the state after the trigger button (switch) is pressed. [Figure 10] FIG. 10 is a schematic perspective view illustrating an example of the metal material of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The metal material, heat-resistant plate, stud, and welding gun of the present invention will now be described. Then, the metal material with studs and heat-resistant plates will be described.

[0010] <Metal materials> In the present invention, the metal material is not particularly limited as long as it is at least partially made of metal. If part of the material is metal and the other part is not, a stud will be welded to the metal part. It is preferable that the metal material is made entirely of metal (metal block). The type of metal is not limited. The metal material is preferably a lump whose main component is iron, and more preferably a steel material such as a steel plate, a steel pipe, an H-beam, a steel sheet pile, or a steel bar, and may be a high-temperature steel material (for example, about 1000 to 1200°C). The size and shape of the metal material are not particularly limited.

[0011] For example, the surface temperature of forged products and cast products produced in the steel production process, specifically steel materials (including intermediate materials) such as slabs, blooms, billets, wire rods, and aggregates of these, measured with a radiation thermometer is usually about 1000 to 1200°C, and the metal material in the present invention may be such a high-temperature steel material. Writing information on the surface of such high-temperature steel using paint or the like places a great burden on the worker and also creates the risk of writing incorrect information.Furthermore, the surface of high-temperature steel is often uneven, making it difficult to write the information on the surface using paint or the like. Therefore, it is preferable to attach a heat-resistant plate with information printed on it in advance, as described below. With stud welding, the stud can be firmly attached in a short time even if the surface is uneven, so the burden on the worker can be reduced even if the surface is hot.

[0012] <Heat-resistant plate> Information about the metal material is sometimes attached to the metal material. Therefore, the information is sometimes attached to a heat-resistant plate, which is then attached to the metal material. Even if the metal material is high-temperature steel produced in the steel production process, the heat-resistant plate is less likely to be damaged.

[0013] The content of the information is not particularly limited, and may be, for example, a product number, information about the next process, information about the delivery destination, etc., as in the case of the heat-resistant plate 1 shown in FIG. The information may be in the form of text, or may be provided as some kind of code such as a barcode, QR code, etc. In the present invention, a heat-resistant plate with such information provided on its surface is fixed to the surface of a metal material via a stud.

[0014] The method for providing information on the surface of the heat-resistant plate is not particularly limited, and for example, the information may be printed or engraved on the surface of the heat-resistant plate. When information is printed on a heat-resistant plate, it is preferable that the ink used for printing is heat-resistant. When the metal material is hot, it is preferable that the information is applied to the surface of the heat-resistant plate using ink that is resistant to deterioration at high temperatures. For example, information can be printed on the surface of the heat-resistant plate using a thermal transfer printer with an ink ribbon that can withstand high temperatures. For example, the HP-L90 manufactured by YS Tech Co., Ltd. can be used as the heat-resistant plate. As the thermal transfer printer, a conventionally known printer such as the M48PRO manufactured by Sato Holdings Corporation can be used.

[0015] In the present invention, the heat-resistant plate has through-holes that penetrate through the plate in the thickness direction. The through hole need only be one through which the shank of a stud (described later) passes, and other than that there are no particular limitations on its form. Since the cross section of a stud is usually circular, it is preferable that the through hole also be a circular through hole with a diameter larger than the diameter of the circular cross section of the stud. However, as long as the shank of the stud passes through, the through hole may be a non-circular shape, such as a triangle or a square.

[0016] The number of through holes in the heat-resistant plate is not particularly limited. The number of through holes is preferably 1 to 3, and more preferably 1 to 2. For example, the heat-resistant plate 1 in the embodiment shown in Fig. 1 has one circular through-hole 3. When the through-hole 3 is circular, its diameter is defined as h. When a heat-resistant plate has one through-hole, the heat-resistant plate can be fixed to the surface of the metal material by passing one stud through the through-hole and welding the stud to the surface of the metal material. If the stud has a flange whose outer diameter is larger than the diameter of the through-hole, as described below, the heat-resistant plate can be fixed more firmly to the surface of the metal material. When the heat-resistant plate has two through holes, the heat-resistant plate can be more firmly fixed to the surface of the metal material by passing one stud through each through hole and welding the studs to the surface of the metal material. If at least one of the two studs has a flange whose outer diameter is larger than the diameter of the through hole, as described below, the heat-resistant plate can be more firmly fixed to the surface of the metal material.

[0017] In the present invention, the heat-resistant plate has the property of being attracted to a magnet. In other words, in the present invention, the heat-resistant plate has the property of being attached to a magnet. Whether or not a heat-resistant plate will stick to a magnet depends on the magnetic force of the magnet. If the magnet used has a high magnetic force, the heat-resistant plate does not need to have a high magnetic property.

[0018] The material of the heat-resistant plate is not particularly limited as long as it has these properties and is not easily deteriorated at high temperatures, and may be made of a metal such as stainless steel, for example.

[0019] The thickness of the heat-resistant plate is not particularly limited. If the heat-resistant plate is too thick, it becomes difficult to form through holes. Also, if the heat-resistant plate is too thick, it becomes heavy, making it difficult to attract the magnet, or the heat-resistant plate attracted to the magnet to remain on the surface of the magnet.

[0020] The size and shape of the heat-resistant plate are not particularly limited, and may be rectangular, for example, like the heat-resistant plate 1 shown in Fig. 1. For example, the heat-resistant plate may be rectangular, with each side measuring several tens of millimeters.

[0021] <Stud> In the present invention, the stud may be any stud whose shaft can be passed through the through-hole of the heat-resistant plate. As will be explained later with reference to the drawings, the shank of the stud in the present invention refers to the part of the stud through which the heat-resistant plate can move when the stud is passed through the through-hole of the heat-resistant plate and welded to the surface of the metal material.

[0022] The studs of the present invention will be described with reference to the drawings. FIG. 2 shows one embodiment of a stud according to the present invention, where FIG. 2(a) is a schematic perspective view and FIG. 2(b) is a schematic cross-sectional view taken along a plane including the axis ω1. The stud 10 shown in FIG. 2 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 10 shown in FIG. X is attached to the surface of the metal material and welded.

[0023] The stud 10 shown in Figure 2 is cylindrical. In this case, the cross section perpendicular to the axis ω1 is circular. If the through hole in the heat-resistant plate is also circular, the diameter (H1) of the stud in the cross section perpendicular to the axis ω1 of the stud should be smaller than the diameter (h) of the circular through hole in the heat-resistant plate. However, the stud does not have to be cylindrical, and may be polygonal, for example, triangular, rectangular, etc. The stud only needs to have a shaft that passes through the through-hole of the heat-resistant plate.

[0024] When the stud is inserted into the through-hole of the heat-resistant plate and welded to the surface of the metal material, the part of the stud along which the heat-resistant plate can move is the shank, so in the case of the stud 10 illustrated in Figure 2, the entire shank corresponds to the shank. In the stud 10 illustrated in FIG. 2, the length of the shank in the axial direction (direction parallel to the axis ω1) is denoted by L1.

[0025] FIG. 3 shows one embodiment of a stud according to the present invention, where FIG. 3(a) is a schematic perspective view and FIG. 3(b) is a schematic cross-sectional view taken along a plane including the axis ω2. The stud 12 shown in FIG. 3 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 121 shown in FIG. X is attached to the surface of the metal material and welded.

[0026] The shank 121 of the stud 12 illustrated in Fig. 3 is cylindrical, similar to the embodiment shown in Fig. 2. In this case, the cross section of the shank 121 in a direction perpendicular to the axis ω2 is circular. If the through hole in the heat-resistant plate is also circular, the diameter (H2) of the shank 121 in the cross section perpendicular to the axis ω2 of the stud should be smaller than the diameter (h) of the circular through hole in the heat-resistant plate. However, the shank of the stud does not have to be cylindrical, and may be, for example, a polygonal prism such as a triangular prism or a rectangular prism. The shank of the stud may be any shank that passes through the through-hole of the heat-resistant plate.

[0027] When the stud is inserted into the through-hole of the heat-resistant plate and welded to the surface of the metal material, the part of the stud along which the heat-resistant plate can move is the shank. Therefore, in the case of the stud 12 illustrated in FIG. 3, the part with a length of L2 in the direction parallel to the axis ω2 is the shank 121.

[0028] The stud 12 shown in FIG. 3 is similar to the stud 10 shown in FIG. 2, but has a tip 121. X The portion including the tip on the opposite side is bent in a direction perpendicular to the axis ω2 of the shaft portion 121. This bent portion is referred to as the curved portion 122. The length of the curved portion 122 in the direction perpendicular to the axis ω2 is referred to as R2. By making this length R2 larger than the diameter (h) of the through-hole, the heat-resistant plate can be fixed more firmly to the surface of the metal material.

[0029] FIG. 4 shows one embodiment of a stud according to the present invention, where FIG. 4(a) is a schematic perspective view and FIG. 4(b) is a schematic cross-sectional view taken along a plane including the axis ω3. The stud 14 shown in FIG. 4 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 141 shown in FIG. X is attached to the surface of the metal material and welded.

[0030] The shank 141 of the stud 14 illustrated in Fig. 4 is cylindrical, similar to the embodiment shown in Fig. 2. In this case, the cross section of the shank 141 in a direction perpendicular to the axis ω3 is circular. Here, if the through hole in the heat-resistant plate is also circular, the diameter (H3) of the shank 141 in the cross section perpendicular to the axis ω3 of the stud should be smaller than the diameter (h) of the circular through hole in the heat-resistant plate. However, the shank of the stud does not have to be cylindrical, and may be, for example, a polygonal prism such as a triangular prism or a rectangular prism. The shank of the stud may be any shank that passes through the through-hole of the heat-resistant plate.

[0031] When the stud is inserted into the through-hole of the heat-resistant plate and welded to the surface of the metal material, the part of the stud along which the heat-resistant plate can move is the shank. Therefore, in the case of the stud 14 illustrated in FIG. 4, the part having a length of L3 in the direction parallel to the axis ω3 is the shank 141.

[0032] The stud 14 of the embodiment shown in FIG. 4 is similar to the stud 10 of the embodiment shown in FIG. 2, but has a tip 141 X The flange 142 is formed in a disk shape at the tip end on the opposite side. The shaft portion 141 and the flange portion 142 are attached so that the axis ω3 of the shaft portion 141 passes through the center of the flange portion 142. The shaft portion 141 and the flange portion 142 may be integrally cast, or may be attached by welding or the like after each portion is formed. The length of the flange portion 142 in the direction perpendicular to the axis ω3 is defined as R3. 4 shows an example in which flange portion 142 is disk-shaped, but there is no particular limitation on the shape of flange portion 142. For example, flange portion 142 may be polygonal, such as triangular or rectangular.

[0033] The flange portion 142 of the stud 14 shown in Figure 4 is disk-shaped, so its diameter is equal to the above-mentioned R3. This length R3 is larger in outer diameter than the diameter (h) of the through hole in the heat-resistant plate. In other words, the shank 141 can pass through the through hole in the heat-resistant plate, but the flange portion 142 cannot. Therefore, when the shank 141 of the stud 14 shown in Figure 4 is inserted into the through hole in the heat-resistant plate and set in a welding gun (described later), the tip 141 shown in Figure 4 is inserted into the through hole in the heat-resistant plate. X When the heat-resistant plate is attached to the surface of the metal material and welded, the heat-resistant plate does not come off from the shaft portion 141, and the shaft portion 141 remains in a state of penetrating the heat-resistant plate, so the heat-resistant plate is held between the surface of the metal material and the flange portion 142, and the heat-resistant plate is fixed to the surface of the metal material. Based on the same idea, even if the through hole is not circular or the flange portion 142 is not disk-shaped, if the flange portion 142 is made larger than the size of the through hole, the heat-resistant plate will not come off the shaft portion 141 and the shaft portion 141 will remain in a state penetrating the heat-resistant plate, so that the heat-resistant plate will be more firmly fixed to the surface of the metal material.

[0034] As shown in FIG. 4, the stud 14 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 141 X When the heat-resistant plate is attached to the surface of the metal material and welded to the surface of the metal material, the heat-resistant plate is held between the surface of the metal material and the flange portion 142, and the heat-resistant plate is fixed to the surface of the metal material, the diameter of the flange portion is larger than the diameter of the through hole in the heat-resistant plate.

[0035] FIG. 5 shows one embodiment of a stud according to the present invention, where FIG. 5(a) is a schematic perspective view and FIG. 5(b) is a schematic cross-sectional view taken along a plane including the axis ω4. The stud 16 shown in FIG. 5 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 161 shown in FIG. X is attached to the surface of the metal material and welded.

[0036] The shank 161 of the stud 16 illustrated in Fig. 5 is cylindrical, similar to the embodiment shown in Fig. 2. In this case, the cross section of the shank 161 in a direction perpendicular to the axis ω4 is circular. If the through hole in the heat-resistant plate is also circular, the diameter (H4) of the shank 161 in the cross section perpendicular to the axis ω4 of the stud should be smaller than the diameter (h) of the circular through hole in the heat-resistant plate. However, the shank of the stud does not have to be cylindrical, and may be, for example, a polygonal prism such as a triangular prism or a rectangular prism. The shank of the stud may be any shank that passes through the through-hole of the heat-resistant plate.

[0037] When the stud is inserted into the through-hole of the heat-resistant plate and welded to the surface of the metal material, the part of the stud along which the heat-resistant plate can move is the shank. Therefore, in the case of the stud 16 illustrated in FIG. 5, the part having a length of L4 in the direction parallel to the axis ω4 is the shank 161.

[0038] The stud 16 shown in FIG. 5 is similar to the stud 10 shown in FIG. 2, but has a tip 161. X The shaft 161 has a disk-shaped flange 162 on the opposite side, and a holding portion 163 on the side away from the shaft 161. The holding portion 163 in the embodiment shown in FIG. 5 is cylindrical like the shaft portion 161, and the axis ω4 of the shaft portion 161 and the axis ω4 of the holding portion 163 coincide with each other. The shaft portion 161 and the flange portion 162 are attached so that the axis ω4 of the shaft portion 161 passes through the center of the flange portion 162. Similarly, the holder portion 163 and the flange portion 162 are attached so that the axis ω4 of the holder portion 163 passes through the center of the flange portion 162. The shaft portion 161, the flange portion 162, and the holder portion 163 may be integrally cast, or may be attached by welding or the like after being formed individually. The length of the flange portion 162 in the direction perpendicular to the axis ω4 is defined as R4. Furthermore, the length of the shaft portion 161 in the axial direction (the direction parallel to the axis ω4) is defined as L4. 5 shows an example in which the flange portion 162 is disk-shaped, but there is no particular limitation on the shape of the flange portion 162. For example, it may be a polygon such as a triangle or a rectangle.

[0039] The flange portion 162 of the stud 16 shown in Figure 5 is disk-shaped, so its diameter is equal to the above-mentioned R4. This length R4 is larger in outer diameter than the diameter (h) of the through-hole in the heat-resistant plate. In other words, the shank 161 can pass through the through-hole in the heat-resistant plate, but the flange portion 162 cannot. Therefore, when the shank 161 of the stud 16 shown in Figure 5 is inserted into the through-hole in the heat-resistant plate and set in a welding gun (the holding portion 163 is attached to the chuck of the welding gun), the tip portion 161 shown in Figure 5 is inserted into the through-hole in the heat-resistant plate. X When the heat-resistant plate is attached to the surface of the metal material and welded, the heat-resistant plate does not come off the shaft portion 161, and the shaft portion 161 remains in a state of penetrating the heat-resistant plate, so the heat-resistant plate is held between the surface of the metal material and the flange portion 162, and the heat-resistant plate is fixed to the surface of the metal material. Based on the same idea, even if the through hole is not circular or the flange portion 162 is not disk-shaped, if the flange portion 162 is made larger than the size of the through hole, the heat-resistant plate will not separate from the shaft portion 161 and the shaft portion 161 will remain in a state penetrating the heat-resistant plate, so that the heat-resistant plate will be more firmly fixed to the surface of the metal material.

[0040] As shown in FIG. 5, the stud 16 is inserted into the through-hole of the heat-resistant plate and set in a welding gun, which will be described later, and the tip 161 X When the heat-resistant plate is attached to the surface of the metal material and welded to the surface of the metal material, the heat-resistant plate is held between the surface of the metal material and the flange portion 162, and the heat-resistant plate is fixed to the surface of the metal material, the diameter of the flange portion is larger than the diameter of the through hole in the heat-resistant plate.

[0041] The stud of the present invention is not particularly limited in length (for example, L1 in FIG. 2, L2 in FIG. 3, L3 in FIG. 4, and L4 in FIG. 5) of the shank (for example, stud 10 itself in FIG. 2, shank 121 in FIG. 3, shank 141 in FIG. 4, and shank 161 in FIG. 5) in a direction parallel to the axis (for example, axis ω1 in FIG. 2, axis ω2 in FIG. 3, axis ω3 in FIG. 4, and axis ω4 in FIG. 5). In this case, the stud that penetrates the heat-resistant plate can be easily welded to the surface of the metal material without substantially damaging the heat-resistant plate.

[0042] The thickness, size, material, etc. of the stud may be the same as those of studs used in conventionally known stud welding.

[0043] <Welding gun> The welding gun used in the present invention will now be described. The welding gun may have a magnet on the outer periphery of the tip of the chuck into which the stud is inserted, in a position where it can attract the heat-resistant plate, and can weld while holding the heat-resistant plate away from the surface of the metal material; other aspects are not particularly limited, and may be similar to, for example, a conventionally known power arc type or short-cycle type welding gun (a welding gun capable of short-cycle type welding is preferred).

[0044] The welding gun used in the present invention will be described with reference to the drawings. FIG. 6 is a schematic side view of a welding gun used in the present invention, and FIG. 7 is a schematic side view showing the welding gun shown in FIG. 6 with a stud that has penetrated a heat-resistant plate attached and pressed against the surface of a metal material. 6 and 7 are examples of welding guns that can be used in the present invention, but the welding guns that can be used in the present invention are not limited to these.

[0045] 6 and 7, the chuck 22 is connected to a lifting rod in the main body 28 via a chuck adapter 24 and a dust bellows 26. The internal structure of the main body 28 will be described later. The welding gun 20 has a tip 22 of a chuck 22. X The stud 40 is inserted into the chuck 22. The stud 40 shown in FIGS. 6 and 7 is the same as the stud 16 shown in FIG. 5, and the holding portion 163 of the stud 16 is inserted into the chuck 22. However, the stud may be of a different type. Even when a stud of a different type is used, the same procedure is followed, and the end of the stud is inserted into the chuck 22. For example, in the case of the stud 14 shown in FIG. 4, a part (end) of the flange portion 142 is inserted into the chuck 22. Tip 22 of chuck 22 X After or before inserting the stud 40 into the heat-resistant plate 42, the shaft of the stud 40 is passed through the through-hole of the heat-resistant plate 42.

[0046] The welding gun has a tip 22 of a chuck 22 into which a stud 40 is inserted. X The magnet 30 is provided on the outer periphery of the metal material 44 at a position where it can attract the heat-resistant plate 42. X When welding the heat-resistant plate 42 to the surface 44 of the metal material 44, X The position where the chuck 22 can be pulled away from the tip 22 of the chuck 22. X If the magnet 30 is located near the outer periphery of the chuck 22, the magnet 30 X and at a position where the heat-resistant plate 42 can be pulled in. As shown in FIG. 7, when the stud 40 is inserted into the chuck 22, the surface 44 of the metal material 44 at the flange portion of the stud 40 X and the surface 44 of the metal material 44 of the magnet. X It is preferable that the surface facing the magnet 30 and the surface facing the stud 40 are at approximately the same position in the horizontal direction. However, even if this horizontal position is slightly off, the magnet 30 can still attract the heat-resistant plate 42. Conversely, the position of the magnet 30 is determined by the position of the tip 22 of the chuck 22 into which the stud 40 is inserted. XThe heat-resistant plate 42 is positioned on the outer periphery of the metal material 44. X Any position where it can be pulled away from the

[0047] Tip 22 of chuck 22 X After or before inserting the stud 40 into the magnet 30, the shaft of the stud 40 is passed through the through-hole of the heat-resistant plate 42. Then, when the heat-resistant plate 42 is attached to the magnet 30, the heat-resistant plate 42 is pressed against the surface 44 of the metal material 44. X The welding can be performed while the state where the metal is separated from the metal can be maintained. As shown in FIGS. 6 and 7, the magnet 30 is supported by a support rod 32 fixed to the welding gun 20, for example.

[0048] The welding gun 20 preferably has a leg 34. The leg 34 is fixed to the welding gun 20. When welding, the tip of the leg 34 is brought into contact with the surface 44 of the metal material 44. X By pressing the welding gun 20 against the workpiece, the position of the welding gun 20 can be stabilized.

[0049] The internal structure of the main body 28 of the welding gun 20 shown in Figures 6 and 7 will be described along with its operation during welding. Figures 8 and 9 are schematic partial cross-sectional views of the main body 28. Figure 8 shows the rest state before the trigger button (switch) is pressed, and Figure 9 shows the state immediately after the trigger button is pressed. As shown in FIGS. 6 and 7, the tip 22 of the chuck 22 X After the stud 40 is inserted into the magnet 30 and the heat-resistant plate 42 is attached to the magnet 30, the tip of the stud 40 is placed on the surface 44 of the metal material 44. X When pressed against the main spring 50, it is slightly compressed and the lifting rod 52 slides through the lifting ring 54. Then, when the trigger button (switch) of the welding gun is pressed, the gun coil 56 is excited. Then, as shown in Figure 9, the gun coil 56 pulls up the movable core 58, causing the lifting ring 54 on the lifting rod 52 to tilt onto the lifting hook on the movable core 58. At this time, the lifting spring 60 and the core spring 62 are compressed. The inclined lifting ring 54 grips the lifting rod 52, and the entire moving part is lifted up together with the stud. Then, the tip of the stud contacts the surface 44 of the metal material 44. X When the wire is pulled up (away) from the ground, an arc occurs. After the pulled-up state continues for a preset time, the gun coil 56 is de-energized. Thereafter, the movable core 58 returns to its original position by the force of the core spring 62. The lifting ring 54 is returned to its original position by the force of the lifting hook and the lifting spring 60. The force of the main spring 50 returns the lifting rod 52 to its original position, causing the melted tip of the stud to contact the surface 44 of the melted metal material 44. X The surface of the metal stud 44 is X The welding to the By this operation, the stud can be welded to the surface of the metal material while the heat-resistant plate is held away from the surface of the metal material.

[0050] An example of a welding gun that has such a mechanism and is capable of performing such short cycle operation is the standard welding gun NS-400SD manufactured by Nippon Stud Welding Co., Ltd. The short cycle method involves welding for 10 to 100 ms with a current of 200 to 2000 A. In contrast, the power arc method involves welding for 100 to 1500 ms with a current of 200 to 2400 A. Furthermore, with the power arc method, the welding area is usually surrounded by a heat-resistant ceramic called a ferrule.

[0051] The welding gun of the present invention may have the above-described configuration. That is, the welding gun of the present invention is a welding gun that can fix a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and a property of being attracted to a magnet to the surface of a metal material by welding a stud that is inserted through the through-hole to the surface of the metal material, This welding gun has a magnet on the outer periphery of the tip of the chuck into which the stud is inserted, and in a position where it can attract the heat-resistant plate, allowing welding to be performed while keeping the heat-resistant plate separated from the surface of the metal material.

[0052] The manufacturing method of the present invention also includes a preparation step of preparing a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and a property of being attracted to a magnet, and a stud that can be passed through the through-hole, and inserting the stud into the chuck of the welding gun of the present invention; a welding process in which the heat-resistant plate is attracted by the magnet to separate the heat-resistant plate from the surface of the metal material, and in that state, the stud is welded to the surface of the metal material using the welding gun of the present invention; and This is a method for manufacturing a metal material with a stud and a heat-resistant plate, in which the metal material has the heat-resistant plate fixed to the surface by welding the stud to the surface.

[0053] In the manufacturing method of the present invention, it is preferable that the stud has a flange whose outer diameter is larger than the diameter of the through hole of the heat-resistant plate.

[0054] In the welding step of the manufacturing method of the present invention, it is preferable to use a short cycle method.

[0055] Next, the metal material with studs and heat-resistant plate of the present invention (hereinafter also referred to as "the metal material of the present invention") will be described. The metal material of the present invention can be obtained by the manufacturing method of the present invention as described above.

[0056] The metallic material of the present invention will be described with reference to the drawings. Fig. 10 is a schematic perspective view showing an example of the metallic material of the present invention. However, the metallic material of the present invention is not limited to the embodiment shown in Fig. 10.

[0057] In FIG. 10, a metal material 70 of the present invention includes a heat-resistant plate 1, a stud 16, and a metal material 44.

[0058] The heat-resistant plate 1 has the form shown in FIG. 1, has information on its surface, has through-holes that run through it in the thickness direction, and has the property of being attracted to a magnet.

[0059] The stud 16 is of the type shown in FIG. 5, and its shaft portion passes through a through-hole of the heat-resistant plate 1, and the tip of the shaft portion contacts the surface 44 of the metal material 44. X The welding method is not particularly limited, but it is preferable that the welding be performed by a short cycle method. The stud preferably has a flange with an outer diameter larger than the diameter of the through hole of the heat-resistant plate.

[0060] The metal material 44 is of the type shown in FIGS. 6 and 7, and the heat-resistant plate 1 and the studs 16 are attached to the surface 44 X has.

[0061] In the metal material 70 of the present invention, the tip of the stud 16 that penetrates the through-hole of the heat-resistant plate 1 is in contact with the surface 44 of the metal material 44. X The metal material is welded to the stud and heat-resistant plate, and the heat-resistant plate 1 is fixed so that it does not come off. [Explanation of symbols]

[0062] 1 Heat-resistant plate 3 Through holes 10, 12, 14, 16 studs 10 X , 12 X , 14 X , 16 X Stud tip 121, 141, 161 Stud shaft 122 Stud bend 142, 162 Flange part of stud 163 Stud holder Axis of ω1, ω2, ω3, ω4 studs 20 Welding Gun 22 Zipper twenty two X Chuck tip 24 Chuck adapter 26 Dust Bellows 28 Main body 30 Magnet 32 Support rod 34 Leg 40 studs 42 Heat-resistant plate 44 Metal materials 44 X Metal surface 50 main spring 52 Lifting Rod 54 Lifting Ring 56 Guncoil 58 Movable Core 60 lifting spring 62 Core Spring 70 Metal material of the present invention (metal material with studs and heat-resistant plate)

Claims

1. A welding gun capable of fixing a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and a property of being attracted to a magnet to the surface of a metal material by welding a stud inserted into the through-hole to the surface of the metal material, a leg for pressing a tip of the leg against the surface of the metal material; a magnet disposed on the outer periphery of the tip of the chuck into which the stud is inserted and at a position spaced apart from the surface of the metal material when the legs are pressed against the surface of the metal material; and capable of welding while maintaining the heat-resistant plate separated from the surface of the metal material.

2. a preparation step of preparing a heat-resistant plate having information on a surface thereof, a through-hole penetrating through the plate in a thickness direction thereof, and having a property of being attracted to a magnet, and a stud that can be passed through the through-hole, and inserting the stud into the chuck of the welding gun according to claim 1; a welding process in which the heat-resistant plate is attracted by the magnet to separate the heat-resistant plate from the surface of the metal material, and in that state, the stud is welded to the surface of the metal material using the welding gun according to claim 1; and A method for manufacturing a metal material with a stud and a heat-resistant plate, wherein the metal material has the heat-resistant plate fixed to the surface by welding the stud to the surface.

3. 3. The method for manufacturing a metal material equipped with a stud and a heat-resistant plate according to claim 2, wherein the stud has a flange having an outer diameter larger than a diameter of the through hole of the heat-resistant plate.

4. 4. The method for manufacturing a metal material with a stud and a heat-resistant plate according to claim 2 or 3, wherein the welding step is performed by a short cycle method.

5. a heat-resistant plate having information on its surface, a through-hole penetrating through the plate in the thickness direction, and having the property of being attracted to a magnet; a stud penetrating the through hole; a metal material having the heat-resistant plate and the studs on a surface thereof; and The metal material with the stud and heat-resistant plate, wherein the tip of the stud that passes through the through hole of the heat-resistant plate is welded to the surface of the metal material, thereby fixing the heat-resistant plate so that it does not come off.

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