Stud welding jig and stud welding method

Abstract

To inhibit scattering of welding spark occurring during stud welding effectively and guarantee workability of stud welding.SOLUTION: A stud welding jig is attached to a lower end of a welding device main part for performing stud welding to a base material to be used. The stud welding jig includes a body part and a lid part forming a substantially cylindrical member which encloses a welding part. The stud welding jig is loosely fitted in the lower end of the welding device main part so as to be movable in a vertical direction relative to the welding device main part. Further, the stud welding jig includes an opening / closing mechanism which removes a stud welded to the base material in a lateral direction or a vertical direction through opening / closing operation of the lid part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a stud welding jig used in stud welding methods for architectural and civil engineering structures, etc., and a stud welding method using the same. [Background technology]

[0002] Stud welding (hereinafter simply referred to as stud welding) is a well-known method used in the construction of architectural and civil engineering structures, in which studs (headed studs, stud bolts, deformed studs, etc.) are hammered into steel frames and welded. Stud welding uses an arc as the heat source to sufficiently melt the stud and base material to create a joint. Stud welding is primarily used as a shear stop for floor slabs, etc., in which case headed studs used to prevent shear on floor slabs or floor plates are attached continuously at a specified pitch on beams.

[0003] In stud welding, sparks are generated during welding, and thus technologies have been devised to prevent the diffusion of sparks, etc. For example, Patent Documents 1 and 2 disclose a stud welding device (jig) that includes a hollow cylindrical body that can suppress scattering of sparks, arcs, etc., and noise during stud welding.

[0004] Furthermore, for example, Patent Document 3 discloses a jig for a stud welding gun that includes a two-layered hollow cylindrical body, with the upper layer made of a hard material and the lower layer made of an elastic material. Furthermore, for example, Patent Document 4 discloses a welding structure that uses a plate material to close off the welding space in order to suppress the spread of sparks, odors, dust, etc. that are generated during arc welding. Furthermore, for example, Patent Document 5 discloses a technology in which the lower periphery of the stud is enclosed with an enclosure member during arc stud welding, thereby reducing the arc blow phenomenon. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 58-209483 [Patent Document 2] Japanese Patent Application Publication No. 5-237660 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-35058 [Patent Document 4] Japanese Patent Publication No. 2022-146211 [Patent Document 5] Japanese Patent Application Laid-Open No. 2002-307167 Summary of the Invention [Problem to be solved by the invention]

[0006] With the rise in safety awareness in the construction industry in recent years, safety measures such as fire prevention during welding are more important than ever, and sparks and flying sparks during welding have become a problem even in stud welding. A common countermeasure to prevent sparks and flying sparks during welding is to lay fireproof curing sheets in a specified area. However, there are cases where laying fireproof curing sheets is difficult, such as in areas where the outer edges of a building or openings during construction must be laid on lower floors.

[0007] Therefore, as in the above-mentioned Patent Documents 1 and 2, for example, it has been proposed to use a stud welding device (jig) that includes a hollow cylindrical body to prevent the scattering of sparks, arcs, etc. In particular, headed studs with enlarged heads are used in stud welding using arcs, and the techniques described in the above-mentioned Patent Documents 1 and 2 are difficult to apply to these headed studs. There are multiple types of stud lengths, and there is a demand for a stud welding jig that can be more flexibly adapted to the dimensions and configuration of studs.

[0008] Furthermore, the above-mentioned Patent Document 3 is used in what is known as a capacitor discharge welding device, which combines the welding device main body with a welding gun. Arc stud welding is known to have a larger heat input than capacitor discharge stud welding, resulting in more welding sparks, and the configuration of Patent Document 3, which uses a hollow cylinder made of an elastic material, may not have sufficient fire resistance. Furthermore, as with Patent Documents 1 and 2, when a headed stud is used, it is difficult to insert and remove the headed stud, raising concerns about reduced workability.

[0009] Furthermore, the technology in Patent Document 4 is intended for general stud bolts, and involves creating a welding space between the steel material and the plate material, and then closing off the welding space to form a closed section, which may not be efficient from the perspective of continuous work. Also, it is difficult to apply this technology to multiple types of studs, including headed studs.

[0010] In addition, in the above-mentioned Patent Document 5, a portion of the cylindrical enclosure member is used as an opening / closing portion, and is configured to be freely opened and closed using a hinge. However, the purpose of this is to reduce the arc blow phenomenon, and it is insufficient as a countermeasure against spark generation and scattering. Furthermore, in stud welding, a welding auxiliary material called a ferrule is used to protect the molten metal from oxygen and nitrogen in the air and to block the molten metal and form a collar (excess metal). When using a welding gun with a holding member called a foot to hold this ferrule, it is necessary to remove the stud laterally from the welding machine when performing continuous welding operations. With the configuration disclosed in Patent Document 5, the enclosure member needs to be redesigned if the stud diameter or ferrule dimensions change, and a jig with better workability is desired.

[0011] Therefore, the inventors of the present invention have conducted extensive research into the configuration of a stud welding jig that can be used universally with stud welding machines that are commonly used in the construction and civil engineering fields and that can handle continuous welding work, with the aim of achieving further improvements in the productivity of stud welding.

[0012] In view of the above circumstances, an object of the present invention is to provide a stud welding jig and a stud welding method that can effectively suppress the scattering of welding sparks that occur during stud welding and ensure the workability of stud welding. [Means for solving the problem]

[0013] In order to achieve the above object, according to the present invention, there is provided a stud welding jig that is attached to the lower end of a welding device body for stud welding to a base material, the stud welding jig including a main body and a lid that constitute a substantially cylindrical member that surrounds a weld, the lid being loosely fitted at the lower end of the welding device body so as to be freely movable in the vertical direction relative to the welding device body, and including an opening and closing mechanism that removes the stud welded to the base material in the horizontal or vertical direction by opening and closing the lid.

[0014] The main body portion is a first arc portion having a notch in part of its approximately annular shape when viewed from above, and the lid portion is a second arc portion that can be closed to cover the notch, and an overlapping portion may be provided between the first arc portion and the second arc portion on the circumferential surface of the approximately cylindrical member, where the two portions overlap.

[0015] The first arc portion and the second arc portion may be configured so that the second arc portion is connected to the notch so as to be freely opened and closed by a spring hinge as a connecting member that functions as the opening and closing mechanism, and the second arc portion is configured to close in the opening and closing direction by the force of the spring.

[0016] The main body portion may have a protrusion formed by protruding a portion of its circumferential surface in the vertical direction, and the protrusion may have a plurality of elongated holes extending in the vertical direction into which bolts provided on the welding device can be loosely fitted to attach the main body portion to the welding device.

[0017] The device may further include a top plate portion that covers a portion of the upper surface of the substantially cylindrical member.

[0018] The approximately cylindrical member includes an approximately cylindrical main body portion having a ceiling surface, and a lid portion attached to cover a portion of a hole formed in the ceiling surface, and the lid portion may be connected to the main body portion via a connecting member that functions as the opening and closing mechanism, and may be configured to be freely movable in the vertical direction toward the inside of the main body portion so as to open and close a portion of the hole using the connecting member as a fulcrum.

[0019] The connecting member may be a spring hinge, and the cover may be connected to the main body so as to close by the force of the spring in the opening and closing direction.

[0020] The ceiling surface of the main body may be formed with an attachment hole through which a member located at the lower end of the welding device main body is inserted, and the back surface of the main body may be formed with a plurality of elongated holes extending in the vertical direction into which bolts provided on the welding device can be loosely fitted, and attachment may be performed by loosely fitting the bolts into the elongated holes while the member located at the lower end of the welding device main body is inserted into the attachment hole.

[0021] The approximately cylindrical member includes a main body portion of approximately cylindrical shape having a notch in part of its circumferential surface, and a lid portion configured to cover the notch and part of the ceiling surface of the main body portion, and the lid portion is configured as an integral part of a circumferential surface portion that covers the notch and a top plate portion that covers part of the ceiling surface, and is connected to the main body portion via a connecting member that functions as the opening and closing mechanism, and is configured to be freely movable laterally toward the outside of the main body portion with the connecting member as a fulcrum.

[0022] In the notch, an overlapping portion is provided between the main body portion and the lid portion, where the members overlap when the lid portion is closed, and the overlapping portion may be provided on both sides of the width of the notch.

[0023] The ceiling surface of the main body may have a through hole formed therein through which a member located at the lower end of the welding device main body is inserted, and the back surface of the main body may have a plurality of elongated holes extending in the vertical direction through which bolts provided on the welding device can be loosely fitted, and installation may be performed by loosely fitting the bolts into the elongated holes while the member located at the lower end of the welding device main body is inserted into the through hole.

[0024] According to another aspect of the present invention, there is provided a stud welding method for performing stud welding by attaching the above-described stud welding jig to welding equipment, the method comprising: lifting the welding equipment and sliding the stud welding jig downward to hold the stud on the welding equipment; lowering the welding equipment while the stud is held on the welding equipment; inserting the tip of the stud into a ferrule that has been placed on a base material in advance to press the stud against the base material; stud welding is performed with the stud welding jig positioned so that it surrounds the periphery of the weld of the stud; and removing the stud from the welding equipment after stud welding; and pulling the welding equipment backward to open and close the second arc portion relative to the notch, thereby extracting the stud laterally from the stud welding jig.

[0025] Furthermore, according to the present invention, there is provided a stud welding method for performing stud welding by attaching the above-described stud welding jig to welding equipment, the stud welding method comprising: pressing the tip of the stud against the lid portion, holding the stud in the welding equipment with the lid portion pressed down, lowering the welding equipment with the stud held in the welding equipment, inserting the tip of the stud into a ferrule that has been placed on a base material in advance to press the stud against the base material, performing stud welding with the stud welding jig positioned so as to surround the periphery of the weld of the stud, and after stud welding, removing the stud from the welding equipment, pressing the stud against the lid portion, raising the welding equipment with the lid portion pressed down, and removing the stud vertically from the stud welding jig.

[0026] Furthermore, according to the present invention, there is provided a stud welding method in which the above-described stud welding jig is attached to a welding device and stud welding is performed, the stud welding method comprising: lifting the welding device and sliding the stud welding jig downwards; holding the stud in the welding device with the lid open; lowering the welding device with the stud held in the welding device; inserting the tip of the stud into a ferrule that has been placed on a base material in advance and pressing the stud against the base material; closing the lid; performing stud welding with the stud welding jig positioned so as to surround the periphery of the weld of the stud; removing the stud from the welding device after stud welding; pressing the stud against the lid and thereby pressing the lid from inside the stud welding jig; and raising the welding device with the lid open; and removing the stud vertically from the stud welding jig. [Effects of the Invention]

[0027] According to the present invention, it is possible to effectively suppress the scattering of welding sparks that occur during stud welding and ensure the workability of stud welding. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic explanatory diagram showing an example of the configuration of a welding device. [Figure 2] FIG. 1 is an explanatory diagram of a stud welding jig according to a first embodiment. [Figure 3] 1 is a schematic view of a stud welding jig according to a first embodiment. FIG. [Figure 4] FIG. 10 is an explanatory diagram showing an example of a configuration in which a top plate portion is provided. [Figure 5] FIG. 1 is a schematic explanatory view of a welding method according to a first embodiment. [Figure 6] FIG. 10 is an explanatory view of a stud welding jig according to a second embodiment. [Figure 7] FIG. 6 is a schematic view of a stud welding jig according to a second embodiment. [Figure 8] FIG. 6 is a schematic explanatory view of a welding method according to a second embodiment. [Figure 9] FIG. 10 is an explanatory diagram of a stud welding jig according to a third embodiment. [Figure 10] FIG. 10 is a schematic view of a stud welding jig according to a third embodiment. [Figure 11] FIG. 10 is a schematic explanatory view of a welding method according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and drawings, components having substantially the same functional configurations will be given the same reference numerals, and duplicated explanations may be omitted. In the following, multiple embodiments of the configuration of the stud welding jig according to the present invention will be illustrated and explained. In such cases, components having common functional configurations will be illustrated with the same reference numerals, and explanations thereof may be omitted.

[0030] <Outline of welding equipment configuration> Figure 1 is a schematic explanatory diagram showing an example of the configuration of a welding device 1 to which the stud welding jig according to the present invention is applied. Figure 1 also shows a metal member (a stud S, described later) to be welded to the base metal, and a welding auxiliary material (a ferrule 30, described later) that is placed on the base metal to protect the molten metal from oxygen and nitrogen in the air and to hold back the molten metal to form a collar (reinforcement). Figure 1(a) is an oblique side view seen from the rear side, and (b) is an oblique side view seen from the front side.

[0031] As shown in FIG. 1, the welding device 1 includes a main body 10 connected to a welding power source (not shown), a stud support member 12 extending downward from the main body 10, and a chuck 15 attached thereto for holding a stud S, which is a metal member to be welded to a base material G. Also attached to the main body 10 is a leg rod 20 for adjusting the distance between the welding device 1 (main body 10) and the base material G. The leg rod 20 is configured to pass through the main body 10 and be flexible in the length direction, and adjusts the distance between the chuck 15 and a foot support part 21, which will be described later, depending on the diameter and length of the stud S to be welded. For example, the distance between the chuck 15 and the foot support part 21 can be adjusted by sliding the leg rod 20 in the length direction and fastening it at a desired position using a set screw 20a.

[0032] A foot support 21 is provided at the bottom of the leg bar 20. The foot support 21 is made up of an extension 21a. A foot 25 for holding and fixing the ferrule 30 is attached to the lower end of the foot support 21 via a bolt mechanism 26. The bolt mechanism 26 is made up of a bolt hole 26a and a dedicated bolt 26b, and is configured so that the dedicated bolt 26b is tightened into the bolt hole 26a that passes through the extension 21a and leads to the foot 25. As an example of the configuration of the dedicated bolt 26b, it may include a threaded portion 27a for fixing the foot 25 and the extension 21a and a gap portion 27b for allowing loose fitting into an elongated hole described below, and a high nut portion 27c may be formed between the threaded portion 27a and the gap portion 27b. It should be noted that, for example, in cases where the stud welding jig according to the present invention is not used, a bolt member of a general construction may be used to fasten the foot 25 and the extension 21a.

[0033] The upper end of the stud S is inserted from the underside of the chuck 15, and in this state the stud S is held. Multiple slits 16 are formed on the circumferential surface of the chuck 15, and the stud S is held by pushing it into holes formed in the underside of the chuck 15. The lower end of the held stud S is inserted into a substantially annular ferrule 30, and the lower end of the stud S is pressed against the base material G during welding.

[0034] The leg rods 20 are fixed at any position in a state in which they can extend and retract relative to the main body 10. The foot 25 attached to the lower end of the foot support part 21 is a member including a substantially arc-shaped part with a notch, and holds down the substantially annular ferrule 30 from its upper surface, thereby pressing it against the base material G to fix it.

[0035] The shape of the stud S in the present invention is not limited, and may be, for example, a headed stud with an enlarged head. By replacing the chuck 15 as described above, it is possible to hold studs S of various shapes.

[0036] Welding is performed as follows using a welding device 1 configured as shown in Figure 1. First, a ferrule 30 is placed in a predetermined position on the base metal G. Then, with the stud S held by the chuck 15, the tip (lower end in the figure) of the stud S is inserted into the center of the approximately annular ferrule 30, and an electric current is passed between the stud S and the base metal G, causing an arc discharge to join the stud S and the base metal G. At this time, the tip (lower end) of the stud S temporarily becomes molten metal, and the surrounding area is blocked by the ferrule 30, forming a collar (reinforcement) at the joint.

[0037] During such stud welding, there are sparks, arcs, etc. that accompany the arc discharge, as well as noise and odors, which can cause fires, etc. One way to prevent sparks, arcs, etc. from scattering is to install a device that covers the welding area, but there is a concern that this will reduce workability when performing continuous stud welding.

[0038] To address these problems, the inventors conducted extensive research into the configuration of a jig that ensures workability during stud welding and can effectively suppress the scattering of sparks and other particles that occur during welding. As a result, they came up with a jig that can be attached to a member (e.g., leg bar 20 or foot support 21) located at the bottom end of the main body 10 of the welding device 1. An example of the configuration of a stud welding jig according to the present invention will now be described.

[0039] <Stud welding jig according to the first embodiment> Figure 2 is an explanatory diagram of a stud welding jig 40 according to a first embodiment of the present invention. Figure 2 illustrates the stud welding jig 40 attached to the welding device 1, with (a) showing the second arc portion 43, which will be described later, closed, and (b) showing the second arc portion 43 open. Figure 3 is a schematic diagram of the stud welding jig 40, with (a) being a side view of one side, (b) being a front view, and (c) being a side view of the other side, and also illustrating corresponding top views.

[0040] As shown in Fig. 2, the stud welding jig 40 is attached to the lower end of the welding device 1. One example of an attachment means may be a bolt mechanism 26 for attaching a foot 25 to the welding device 1. Any number of bolt mechanisms 26 may be used, and in the example shown in Fig. 1, two bolt mechanisms 26 are used. The dedicated bolt 26b is loosely fitted into a protrusion 45 (described later) so as to be movable in the vertical direction, thereby attaching the stud welding jig 40 to the welding device 1.

[0041] 3, the stud welding jig 40 has a generally annular shape in top view and includes a first arcuate portion 42 with a notch 41 formed in a portion thereof, and a second arcuate portion 43 that is provided to cover the notch 41 when closed. The first arcuate portion 42 forms the main body of the stud welding jig 40, and the second arcuate portion 43 forms a lid that closes the notch 41 in the main body. The position of the notch 41 is arbitrary, as long as it allows the stud S welded to the base material G to be easily pulled out from the stud welding jig 40. The width of the notch 41 may be designed to be larger than the shaft diameter of the stud S (or the head diameter in the case of a headed stud).

[0042] In the first arc portion 42 of the stud welding jig 40, the angle θ1 of the range within which the notch 41 is formed when the first arc portion 42 has a substantially annular shape in top view may be designed so that the stud S welded to the base material G can be easily pulled out from the stud welding jig 40.

[0043] The first arc portion 42 and the second arc portion 43 are connected by a connecting member 44 that functions as an opening / closing mechanism, and the two arc portions 42, 43 form a substantially cylindrical member. The connecting member 44 is disposed at one end 41a of the notch 41, and the second arc portion 43 is configured to be able to open and close freely around this connecting member 44. The diameter of the substantially cylindrical member formed by the two arc portions 42, 43 can be designed arbitrarily. This design may be based on, for example, the burn marks on the base material G after stud welding, and as one example, it may be designed to be 2.5 times the outer diameter of the shank of the stud S. Note that the connecting member 44 is preferably a spring hinge, and may be configured to close by spring force in the opening / closing direction.

[0044] Furthermore, when the second arc portion 43 is attached to cover the notch 41 and the first arc portion 42 and the second arc portion 43 form a substantially cylindrical shape, the first arc portion 42 and the second arc portion 43 may partially overlap at one end 41a and the other end 41b of the notch 41, forming an overlapping portion 46. The width of the overlapping portion 46 may be, for example, approximately 1.5 mm. In this embodiment, the overlapping portion 46a is formed at one end 41a so that the second arc portion 43 is on the inner side, and the overlapping portion 46b is formed at the other end 41b so that the second arc portion 43 is on the outer side. A connecting member 44 may be attached to one end 41a so as to fit the step created by the overlapping portion 46a. For example, as shown in the figure, the connecting member 44 may be attached to the second arc portion 43 via a spacer 49a that fills in the step in the second arc portion 43. Furthermore, the connecting member 44 may be attached to the first arc portion 42 via a spacer 49b so that the second arc portion 43 opens obliquely upward when the second arc portion 43 is opened.

[0045] The first arc-shaped portion 42 has a protrusion 45 formed by a portion of its circumferential surface protruding in the height direction. As shown in the figure, the height h1 of the protrusion 45 is greater than the height h2 of the remaining portion of the first arc-shaped portion 42. The width of the protrusion 45 may be designed to be appropriate for performing stud welding when the stud welding jig 40 is attached to the welding device 1. In addition, the upper corner of the protrusion 45 may be chamfered to allow smooth movement even when the welding device 1 and the stud welding jig 40 come into contact with each other.

[0046] The protrusion 45 may be formed with a vertically extending elongated hole 47 for loosely fitting the dedicated bolt 26b to attach the stud welding jig 40 to the welding device 1. By loosely fitting the dedicated bolt 26b (see FIG. 1, not shown in FIG. 3) into this elongated hole 47, the dedicated bolt 26b functions as an attachment member, and the stud welding jig 40 is attached to the welding device 1 in a state where it can move freely in the vertical direction. For example, the gap 27c of the dedicated bolt 26b is guided by the elongated hole 47 and is configured to be slidable. The longitudinal length of the elongated holes 47 may be designed as desired, and may be designed, for example, so that the entire height (height h1) of the protrusion 45 is covered by the welding device 1 during welding. The lower end positions of the elongated holes 47 may be designed to be positioned so that the dedicated bolts 26b do not interfere with other members when the welding device 1 is pressed against the base material G. The number of elongated holes 47 may be determined as desired, and multiple elongated holes may be formed to a number sufficient to prevent rotation of the stud welding jig 40. For example, two elongated holes 47 corresponding to the number of dedicated bolts 26b may be formed.

[0047] The dimensions of the stud welding jig 40, such as the heights h1 and h2, can be arbitrarily designed so that the stud S is sufficiently covered by the first arc portion 42 and the second arc portion 43 when attached to the welding device 1 during welding, and so that scattering of sparks and the like is prevented. As an example, height h2 may be designed to be at least one-third the length of the shank of the stud S, and height h1 may be designed so that the entire height direction range (height h1) of the protrusion 45 is covered by the welding device 1 during welding. Furthermore, from the perspective of ease of operation when holding the stud S in the welding device 1, it is desirable that heights h1-h2 be configured so that the gap from the bottom surface of the chuck 15 to the upper end position of height h2 is at least the length of the stud S.

[0048] 2 and 3, a top plate 50 may be provided across the first arcuate portion 42 and the second arcuate portion 43 of the substantially cylindrical member to cover part of the top surface thereof. Fig. 4 is an explanatory diagram showing an example of a configuration in which a top plate 50 is provided on a stud welding jig 40 according to this embodiment, and shows a front view and a corresponding top view.

[0049] As shown in FIG. 4, a top plate 50 may be provided to cover a portion of the top surface of a substantially cylindrical member consisting of the first arc portion 42 and the second arc portion 43. The top plate 50 may be composed of multiple members, such as a left end plate 50a, a front top plate 50b, and a right top plate 50c, as shown in the figure. The top plate 50 covers a portion of the top surface of the cylindrical member consisting of the first arc portion 42 and the second arc portion 43, with the remaining uncovered area serving as an insertion hole 52. The insertion hole 52 need only be large enough to allow the stud S, foot support 21, foot 25, etc. to be inserted therethrough when the stud welding jig 40 is attached to the welding device 1 and moves up and down.

[0050] The means for attaching the top plate portion 50 to the first arc portion 42 and the second arc portion 43 is arbitrary, and for example, a groove (not shown) for attachment and detachment may be provided in the thickness direction of the top plate portion 50. In addition to fitting into the groove, adhesive bonding, bolt fixing, etc. may also be used.

[0051] The material of the stud welding jig 40 described with reference to Figures 2 to 4 can be selected arbitrarily, and is preferably resin from the standpoint of fire resistance and workability, and may be, for example, vinyl chloride resin, which is flame-retardant and lightweight.

[0052] <Stud welding method according to the first embodiment> Next, a stud welding method using the stud welding jig 40 according to the first embodiment will be described. Fig. 5 is a schematic explanatory diagram of the welding method according to the first embodiment, showing the welding process progressing in the order of (a) to (e). Fig. 5 also shows a side view of the welding apparatus 1 equipped with the stud welding jig 40, and a corresponding schematic top view.

[0053] (Pre-welding stage) First, as shown in Figure 5(a), the stud S is attached to the welding device 1. As shown in the figure, the head of the stud S is inserted into the chuck 15 from the side of the device and held there. At this time, by lifting the welding device 1, the stud welding jig 40 naturally slides downward due to gravity, making it easy to insert the stud S into the chuck 15.

[0054] (welding position) Next, as shown in Figure 5(b), the welding device 1 is lowered with the stud S held in the chuck 15, and the tip (lower end) of the stud S is inserted into the ferrule 30 that has been placed in advance on the base material G. When the stud S is pressed against the base material G, the foot 25 comes into contact with the upper surface of the ferrule 30, and the stud welding jig 40 is placed so as to surround the periphery of the stud S. In other words, the periphery of the welded portion of the stud welding is surrounded by the stud welding jig 40. At this time, the installation portion (welded portion) of the stud S may be visually confirmed by the worker, if necessary.

[0055] (Welding stage) Then, as shown in Figure 5(c), a current is passed between the stud S and the base metal G, and welding is performed by joining the stud S and the base metal G by the resulting arc discharge. At this time, the tip (bottom end) of the stud S temporarily becomes molten metal, and the surrounding area is blocked by the ferrule 30, forming a collar (reinforcement) at the joint. At this time, the installation portion (weld portion) of the stud S is surrounded on all sides by the stud welding jig 40, and the elongated hole 47 formed in the stud welding jig 40 is blocked from the inside by the welding device 1. Note that when welding sparks and the like that are generated during welding are noticeable, a configuration provided with a top plate portion 50 as described with reference to Figure 4 may be employed.

[0056] (Post-welding stage) Next, after welding is completed, the welding device 1 is raised by the worker to remove the stud S from the chuck 15. The worker then pulls the welding device 1 rearward (toward the left in the figure). At this time, as shown in FIG. 5(d), the stud S is fixed (joined) to the base material G by welding, and the second arc portion 43 of the stud welding jig 40 is opened by the stud S, and the stud S is extracted from its interior to its exterior. As shown in FIG. 5(e), the stud S is completely extracted laterally from the stud welding jig 40, completing the welding of one stud S.

[0057] By repeating the series of welding steps described above with reference to FIGS. 5(a) to 5(e), it is possible to continuously weld a plurality of studs S to the base material G.

[0058] <Effects of the First Embodiment> The stud welding jig 40 according to the first embodiment of the present invention, as well as the welding equipment and welding method using it, can effectively suppress the scattering of welding sparks and other particles that occur during stud welding, thereby improving safety by preventing fires. Furthermore, the stud welding jig 40 is configured to be easily attached and detached from the welding equipment 1, and can be used with general-purpose studs without requiring any additional processing on the welding equipment 1.

[0059] Furthermore, the stud welding jig 40 according to this embodiment has a configuration in which, when attached to the welding equipment 1, a slot 47 is formed and a dedicated bolt 26b is loosely fitted into the slot 47, allowing the stud welding jig 40 to move up and down relative to the welding equipment 1. As a result, even if the welding equipment 1 is tilted slightly during welding in the stud welding method described with reference to FIG. 5 , gravity keeps the stud welding jig 40 firmly attached to the base material G, ensuring that the weld is securely enclosed within the stud welding jig 40. Furthermore, after welding is complete, the stud S can be easily removed and the next process can be started. This ensures workability comparable to conventional welding work, while effectively suppressing welding sparks, ensuring no degradation in workability even during continuous welding. Furthermore, by attaching the stud welding jig 40 to the foot-fixed position, there is no need to change the design of the stud welding jig 40 even if the length of the stud S is changed.

[0060] <Stud welding jig according to the second embodiment> Fig. 6 is an explanatory diagram of a stud welding jig 60 according to a second embodiment of the present invention. Fig. 6 illustrates the stud welding jig 60 attached to the welding device 1, with (a) showing the lid 63, described later, in a closed state, and (b) showing the lid 63 in an open state. Fig. 7 is a schematic diagram of the stud welding jig 60, with (a) being a plan view, (b) being a side view, (c) being a front view, and (d) being a rear view. In the following description, components having the same functional configuration as those in the first embodiment are designated by the same reference numerals, and their description may be omitted.

[0061] As shown in Fig. 6, the stud welding jig 60 is attached to the lower end of the welding device 1. One example of an attachment means may be a bolt mechanism 26 for attaching a foot 25 to the welding device 1. The number of bolt mechanisms 26 is arbitrary, and as in the first embodiment, two bolt mechanisms 26 may be used. The stud welding jig 60 is attached to the welding device 1 by loosely fitting a dedicated bolt 26b into a long hole 69 (described later) so as to be movable in the vertical direction.

[0062] 7, the stud welding jig 60 includes a substantially cylindrical main body 62 having a ceiling surface 61 that is substantially circular in top view, and a lid 63 that can be attached to open and close and that can close a portion of a hole 65 (hole 65b, described below) formed in the ceiling surface 61. The diameter of the substantially cylindrical member formed by the main body 62 having the ceiling surface 61 can be designed arbitrarily. This design may be based on, for example, the burn marks on the base material G after stud welding, and as an example, it may be designed to be 2.5 times the outer diameter of the shank of the stud S.

[0063] The lid 63 is connected to the main body 62 via a connecting member 64 that functions as an opening / closing mechanism, and the lid 63 is configured to be movable around the connecting member 64. The opening and closing direction of the lid 63 is the up-and-down direction, and when closed, it is approximately horizontal, blocking part of the hole 65. When opened, the lid 63 moves so that the inner end faces diagonally downward, with the connecting member 64 as a fulcrum, and the hole 65 is open (see FIG. 6). Note that the connecting member 64 is preferably a spring hinge, for example, and may be configured to close by the force of a spring in the opening / closing direction.

[0064] 7(a), hole 65 is formed so as to include the center of ceiling surface 61, and includes hole 65a located approximately in the center of ceiling surface 61, and hole 65b configured to be wider than hole 65a. The width of hole 65 can be designed arbitrarily; for example, width W1 of hole 65a may be designed to be larger than the outer diameter of the shank of stud S, and hole 65b may be designed to be larger than the diameter of the head of stud S if the stud S is a headed stud. Furthermore, a tapered shape may be formed at joint 65c between hole 65a and hole 65b to prevent interference with the stud welding jig 60, and to make it easier to guide the shank of stud S to the welding position when inserting the stud S.

[0065] 7(b), when closed, the lid portion 63 is substantially horizontal, with the hole 65b being closed and the hole 65a remaining open. The inner end of the lid portion 63 may be formed with a bent portion 63a for opening the lid portion 63 by the pulling operation of the welding device 1. The outer end of the lid portion 63 may be formed with a bent portion 63b for preventing it from getting caught even if it interferes with the studs S that have already been installed (studs S around the welded portion).

[0066] Additionally, a mounting hole 67 is formed on the back side of the ceiling surface 61 of the stud welding jig 60 for mounting the stud welding jig 60 to the welding device 1. A member located at the lower end of the welding device 1 is inserted into the mounting hole 67, and as an example, the foot support 21 of the welding device 1 is inserted into the mounting hole 67 as shown in FIG.

[0067] As shown in FIG. 7(d), a vertically extending elongated hole 69 may be formed on the rear side of the main body 62. The elongated hole 69 is used to attach the stud welding jig 60 to the welding device 1 by loosely fitting the dedicated bolt 26b (see FIG. 1, not shown in FIG. 7). By loosely fitting the dedicated bolt 26b into the elongated hole 69, the dedicated bolt 26b functions as an attachment member, and the stud welding jig 60 is attached to the welding device 1 in a manner that allows it to move up and down. For example, the gap 27c of the dedicated bolt 26b is guided by the elongated hole 69, allowing it to slide freely. The longitudinal length of the elongated hole 69 may be designed arbitrarily. For example, the elongated hole 69 may be designed so that the entire height (height h3) of the elongated hole 69 is covered by the welding device 1 during welding. The number of elongated holes 69 is arbitrary. Multiple elongated holes may be formed to prevent rotation of the stud welding jig 60. For example, two elongated holes 69 corresponding to the number of dedicated bolts 26b may be formed.

[0068] 6 and 7, the material of the stud welding jig 60 can be selected arbitrarily, and is preferably resin in terms of fire resistance and workability, such as vinyl chloride resin, which is flame-retardant and lightweight. The material of the lid 63 may also be transparent resin so that the inside of the stud welding jig 60 can be seen.

[0069] <Stud welding method according to the second embodiment> Next, a stud welding method using a stud welding jig 60 according to a second embodiment will be described. Fig. 8 is a schematic explanatory diagram of the welding method according to the second embodiment, showing the welding process progressing in the order of (a) to (e). Fig. 8 also shows a side view of welding equipment 1 equipped with a stud welding jig 60.

[0070] (Pre-welding stage) First, as shown in Figure 8(a), the stud S is attached to the welding device 1. As shown in the figure, the tip (lower end) of the stud S is pressed against the lid portion 63, and with the lid portion 63 pressed down, the head of the stud S is inserted into and held in the chuck 15. At this time, the stud welding jig 60 naturally slides downward due to gravity, ensuring space for holding the stud S in the welding device 1, and the stud S can be easily inserted into the chuck 15.

[0071] (welding position) Next, as shown in Figure 8(b), the welding device 1 is lowered with the stud S held in the chuck 15, and the tip (lower end) of the stud S is inserted into the ferrule 30 that has been placed in advance on the base material G. When the stud S is pressed against the base material G, the foot 25 comes into contact with the upper surface of the ferrule 30, and the stud welding jig 60 is placed so as to surround the periphery of the stud S. In other words, the periphery of the welded portion of the stud welding is surrounded by the stud welding jig 60. At this time, the installation portion (welded portion) of the stud S may be visually confirmed by the worker, if necessary.

[0072] (Welding stage) Then, as shown in Figure 8(c), a current is passed between the stud S and the base metal G, and welding is performed by the resulting arc discharge to join the stud S and the base metal G. At this time, the tip (bottom end) of the stud S temporarily becomes molten metal, and the surrounding area is blocked by the ferrule 30, forming a collar (reinforcement) at the joint. At this time, the installation portion (weld portion) of the stud S is surrounded on all sides by the stud welding jig 60, and the elongated hole 69 formed in the stud welding jig 60 is blocked from the inside by the welding device 1.

[0073] (Post-welding stage) Next, after welding is completed, the welding device 1 is raised by the operator to remove the stud S from the chuck 15. At this time, as shown in FIG. 8(d), the stud S is fixed (joined) to the base material G by welding, and the stud S is pressed against the lid portion 63 (bent portion 63a), causing the lid portion 63 to be pressed down. In other words, the lid portion 63 is pressed down, causing the hole portion 65 (particularly hole portion 65b) to be opened, and in this state the welding device 1 and the stud welding jig 60 are raised, causing the stud S to be extracted below the stud welding jig 60. As shown in FIG. 8(e), the stud S is completely extracted vertically from the stud welding jig 60, completing the welding of one stud S.

[0074] By repeating the series of welding steps described above with reference to FIGS. 8(a) to 8(e), it is possible to continuously weld a plurality of studs S to the base material G.

[0075] <Effects of the Second Embodiment> The stud welding jig 60 according to the second embodiment of the present invention, as well as the welding equipment and welding method using it, can effectively suppress the scattering of welding sparks and other particles that occur during stud welding, thereby improving safety by preventing fires. Furthermore, the stud welding jig 60 is configured to be easily attached and detached from the welding equipment 1, and can be used with general-purpose studs without requiring any additional processing on the welding equipment 1.

[0076] Furthermore, the stud welding jig 60 according to this embodiment has a configuration in which, when attached to the welding equipment 1, a slot 69 is formed and a dedicated bolt 26b is loosely fitted into the slot 69, allowing the stud welding jig 60 to move up and down relative to the welding equipment 1. As a result, even if the welding equipment 1 is tilted slightly during welding in the stud welding method described with reference to FIG. 8 , gravity keeps the stud welding jig 60 firmly attached to the base material G, ensuring that the weld is securely enclosed within the stud welding jig 60. Furthermore, after welding is complete, the stud S can be easily removed and the next process can be started. This ensures workability comparable to conventional welding work, while effectively suppressing welding sparks, ensuring no degradation in workability even during continuous welding. Furthermore, because the stud welding jig 60 is attached to the foot-fixed position, there is no need to change the design of the stud welding jig 60 even if the length of the stud S is changed.

[0077] <Stud welding jig according to the third embodiment> Fig. 9 is an explanatory diagram of a stud welding jig 80 according to a third embodiment of the present invention. Fig. 9 illustrates the stud welding jig 80 attached to the welding device 1, with (a) showing the lid 83, described below, in a closed position, and (b) showing the lid 83 in an open position. Fig. 10 is a schematic diagram of the stud welding jig 80, with (a) being a plan view, (b) being a side view, (c) being a front view, and (d) being a rear view. In the following description, components having the same functional configuration as those in the first and second embodiments are designated by the same reference numerals, and their description may be omitted.

[0078] As shown in Fig. 9, the stud welding jig 80 is attached to the underside of the welding device 1. As an example of an attachment means, a bolt mechanism 26 for attaching a foot 25 to the welding device 1 may be used. The number of bolt mechanisms 26 is arbitrary, and two bolt mechanisms 26 may be used as in the first and second embodiments. The stud welding jig 80 may be attached to the welding device 1 by loosely fitting a dedicated bolt 26b into an elongated hole 89 described below so as to be movable in the vertical direction.

[0079] 9 and 10, a stud welding jig 80 includes a substantially cylindrical main body 82 having a notch 81 on part of its circumferential surface, and a lid 83 configured to cover the notch 81 and part of a ceiling surface 84 of the substantially cylindrical main body 82. The lid 83 is composed of a peripheral surface 83a that covers the notch 81 and a top plate 83b that covers part of the ceiling surface 84. The peripheral surface 83a and the top plate 83b may be integrated together by, for example, a metal fitting or the like.

[0080] Additionally, an insertion hole 87 is formed in the ceiling surface 84, through which a component of the welding device 1, such as the stud support member 12, is inserted. In other words, the top plate portion 83b does not cover the entire surface of the ceiling surface 84, and the insertion hole 87 is formed in the uncovered portion. The shape and size of the insertion hole 87 can be designed arbitrarily, as long as it is large enough to allow the stud support member 12 or leg rod 20 to be inserted when the stud welding jig 80 is attached to the welding device 1 and moves up and down.

[0081] The diameter of the substantially cylindrical member formed by the main body 82 and the lid 83 can be designed arbitrarily. This design can be based on, for example, the burn marks on the base material G after stud welding, and as an example, it can be designed to be three times the outer diameter of the shank of the stud S. The height of the substantially cylindrical member formed by the main body 82 and the lid 83 can also be designed arbitrarily, and need only be such that it can prevent the scattering of welding sparks and the like that are generated during stud welding.

[0082] The height h4 and width h5 of the notch 81 formed in the main body 82 and covered by the lid 83 can be designed arbitrarily, and may be, for example, of a width that allows the stud S to be easily held in the chuck 15 of the welding device 1 when the stud welding jig 80 is attached to the welding device 1.

[0083] The lid 83 is connected to the main body 82 via a connecting member 85 that functions as an opening / closing mechanism, and the lid 83 can be opened and closed using the connecting member 85 as a fulcrum. The connecting member 85 is attached, for example, so as to straddle the lower end of the peripheral surface 83a and the lower end of a notch 81 formed in the main body 82. The lid 83 is opened and closed using the connecting member 85 as a fulcrum. The lid 83 opens and closes by tilting laterally outward to open the notch 81. That is, the integrated peripheral surface 83a and top plate 83b tilt until the peripheral surface 83a becomes approximately horizontal, thereby opening the notch 81 and the ceiling surface 84 in the approximately cylindrical member formed by the main body 82 and the lid 83 (see FIG. 9(b)). The connecting member 85 is preferably, for example, a spring hinge, and may be configured to open in the opening / closing direction using the force of a spring.

[0084] 10(c), in the notch 81 formed in the main body 82, an overlapping portion 86 may be provided between the main body 82 and the lid portion 83, where the components overlap when the lid portion 83 is closed. The overlapping portion 86 may be provided on both sides of the notch 81 in the width direction, and the width thereof may be, for example, approximately 1.5 mm. In addition, in order to strengthen the closure by the lid portion 83, a magnet portion 86a may be provided in the overlapping portion 86, and the closure by the lid portion 83 may be strengthened by magnetic force.

[0085] 10(d), the rear side of the main body 82 may be formed with a vertically extending elongated hole 89 for loosely fitting the dedicated bolt 26b (see FIG. 1, not shown in FIG. 10) to attach the stud welding jig 80 to the welding device 1. By loosely fitting the dedicated bolt 26b into this elongated hole 89, the dedicated bolt 26b functions as an attachment member, and the stud welding jig 80 is attached to the welding device 1 in a manner that allows it to move up and down. For example, the gap 27c of the dedicated bolt 26b is guided by the elongated hole 89, allowing it to slide freely. The longitudinal length of the elongated hole 89 may be designed arbitrarily. For example, it may be designed so that the entire height (height h6) of the elongated hole 89 is blocked by the welding device 1 during welding. The number of elongated holes 89 is arbitrary, and multiple elongated holes may be formed to prevent rotation of the stud welding jig 80. For example, two elongated holes 89 corresponding to the number of dedicated bolts 26b may be formed.

[0086] 9 and 10 can be made of any material, and is preferably made of resin from the standpoints of fire resistance and workability, such as vinyl chloride resin, which is flame-retardant and lightweight. Furthermore, the material of the lid 83 may be transparent resin, allowing the interior of the stud welding jig 80 to be visually observed.

[0087] <Stud welding method according to the third embodiment> Next, a stud welding method using a stud welding jig 80 according to a third embodiment will be described. Fig. 11 is a schematic explanatory diagram of the welding method according to the third embodiment, showing the welding process progressing in the order of (a) to (e). Fig. 11 also shows a side view of welding equipment 1 equipped with a stud welding jig 80.

[0088] (Pre-welding stage) First, as shown in Figure 11(a), the stud S is attached to the welding device 1. As shown in the figure, with the lid 83 open, the head of the stud S is inserted into the chuck 15 from the side of the device and held therein. At this time, the stud welding jig 80 naturally slides downward due to gravity, ensuring space for holding the stud S in the welding device 1, and the stud S can be easily inserted into the chuck 15.

[0089] (welding position) Next, as shown in FIG. 11(b), the welding device 1 is lowered with the stud S held in the chuck 15, and the tip (lower end) of the stud S is inserted into the ferrule 30 that has been placed in advance on the base material G. At this time, the lid portion 83 is closed. When the stud S is pressed against the base material G, the foot 25 abuts against the upper surface of the ferrule 30, and the stud welding jig 80 is placed so as to surround the periphery of the stud S. In other words, the periphery of the welded portion of the stud welding is surrounded by the stud welding jig 80. At this time, the installation portion (welded portion) of the stud S may be visually confirmed by the worker, if necessary.

[0090] (Welding stage) 11(c), a current is passed between the stud S and the base metal G, and welding is performed by causing an arc discharge to join the stud S and the base metal G. At this time, the tip (bottom end) of the stud S temporarily becomes molten metal, and the surrounding area is blocked by the ferrule 30, forming a collar (reinforcement) at the joint. At this time, the installation area (weld area) of the stud S is covered on the ceiling surface 84 by the welding device 1 and the top plate portion 83b, and the surrounding area is covered by the main body portion 82 and the peripheral surface portion 83a. In addition, the elongated hole 89 formed in the stud welding jig 80 is blocked from the inside by the welding device 1. In other words, welding is performed with the entire periphery of the weld area surrounded by the stud welding jig 80.

[0091] (Post-welding stage) Next, after welding is complete, the welding device 1 is raised by the operator to remove the stud S from the chuck 15. At this time, as shown in FIG. 11(d), the stud S is fixed (joined) to the base material G by welding, and as the stud S is pressed against the lid portion 83, the lid portion 83 is pressed from the inside and opened. At this time, the lid portion 83 may be opened manually by the operator. In this state, the welding device 1 and the stud welding jig 80 are raised, and the stud S is removed downward from the stud welding jig 80. As shown in FIG. 11(e), the stud S is completely removed vertically from the stud welding jig 80, completing the welding of one stud S. After welding one stud S, the lid portion 83 is in the open state, facilitating the process of attaching the next stud S to the welding device 1.

[0092] By repeating the series of welding steps described above with reference to FIGS. 11(a) to 11(e), it is possible to continuously weld a plurality of studs S to the base material G.

[0093] <Effects of the Third Embodiment> The stud welding jig 80 according to the third embodiment of the present invention, as well as the welding equipment and welding method using it, described above, effectively suppresses the scattering of welding sparks and other particles that occur during stud welding, thereby improving safety by preventing fires and other hazards. Furthermore, the stud welding jig 80 is configured to be easily attached and detached from the welding equipment 1, and can be used with general-purpose studs without requiring any additional processing on the welding equipment 1. Furthermore, by positioning the stud welding jig 80 at the foot fixing position, there is no need to change the design of the stud welding jig 80 even if the length of the stud S is changed.

[0094] Furthermore, in the stud welding jig 80 according to this embodiment, when it is attached to the welding equipment 1, elongated holes 89 are formed and dedicated bolts 26b are loosely fitted into the elongated holes 89, allowing the stud welding jig 60 to move freely up and down relative to the welding equipment 1. As a result, in the stud welding method described with reference to Figure 11, even if the welding equipment 1 is slightly tilted during welding, gravity will allow the stud welding jig 60 itself to be placed with no gaps against the base material G, ensuring that the periphery of the weld is securely surrounded by the stud welding jig 80. In addition, after welding is complete, the stud S can be easily removed and the process can move on to the next step. In other words, while ensuring workability that is the same as conventional welding work, flying welding sparks can be effectively suppressed, and workability does not decrease even during continuous work.

[0095] While one embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment. It is clear that a person skilled in the art can conceive of various modifications and alterations within the scope of the ideas set forth in the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0096] Furthermore, the effects described in this specification are merely descriptive or exemplary and are not limiting. In other words, the technology according to the present invention may achieve other effects that will be apparent to those skilled in the art from the description of this specification, in addition to or in place of the above-described effects. [Industrial Applicability]

[0097] The present invention is applicable to a stud welding jig used in stud welding methods for architectural and civil engineering structures, etc., and to a stud welding method using the same. [Explanation of symbols]

[0098] 1...Welding equipment 10...(Welding equipment) body 15...Chuck 25...Foot 26...Bolt mechanism 30...Ferrule 40...Stud welding jig (according to the first embodiment) 41...Notch 42...First arc section (as the main body) 43...Second arc section (as the lid section) 44...Connecting member 45...Convex part 46...Overlapped section 47…Long hole 50...Top plate 60...Stud welding jig (according to the second embodiment) 62...Main body 63…Lid part 64...Connecting member 67...Mounting hole 69...long hole 80...Stud welding jig (according to the third embodiment) 81...Notch 82...Main body 83…Lid part 85...Connecting member 86...Overlapped section 87...Through hole 89…long hole S...Stud

Claims

1. A stud welding jig that is attached to the lower end of a welding device body for stud welding to a base material, a main body and a lid that form a substantially cylindrical member that surrounds the welded portion; a lower end of the welding device body, the lower end of the welding device body being loosely fitted to the welding device body so as to be movable up and down relative to the welding device body; A stud welding jig comprising an opening and closing mechanism that removes the stud welded to the base material in a horizontal or vertical direction by opening and closing the lid.

2. the main body portion is a first arc portion having a notch in a part of a substantially annular shape in a top view, the cover portion is a second arc portion that can be closed so as to cover the notch, 2. The stud welding jig according to claim 1, wherein an overlapping portion where the first arcuate portion and the second arcuate portion overlap each other is provided between the first arcuate portion and the second arcuate portion on the circumferential surface of the substantially cylindrical member.

3. the first arc portion and the second arc portion are connected to the notch so as to be freely openable and closable by a spring hinge as a connecting member that functions as the opening and closing mechanism; The stud welding jig according to claim 2, wherein the second arcuate portion is configured to close in the opening and closing direction by the force of a spring.

4. The main body is provided with a protrusion configured by a part of the circumferential surface thereof protruding in a height direction, 4. The stud welding jig according to claim 3, wherein the convex portion is formed with a plurality of elongated holes extending in a height direction into which bolts provided on the welding device can be loosely fitted to attach the main body to the welding device.

5. The stud welding jig according to any one of claims 2 to 4, further comprising a top plate portion covering a portion of an upper surface of the substantially cylindrical member.

6. The substantially cylindrical member is a substantially cylindrical main body having a ceiling surface; a lid attached to cover a portion of the hole formed in the ceiling surface, 2. The stud welding jig according to claim 1, wherein the lid is connected to the main body via a connecting member that functions as the opening / closing mechanism, and is configured to be movable vertically toward the inside of the main body with the connecting member as a fulcrum to open and close a portion of the hole.

7. 7. The stud welding jig according to claim 6, wherein the connecting member is a spring hinge, and the lid is connected to the main body so as to close by the force of the spring in the opening and closing direction.

8. A mounting hole is formed in the ceiling surface of the main body portion, through which a member located at the lower end of the welding device main body is inserted, A plurality of elongated holes extending in a height direction are formed on the rear surface of the main body, into which bolts provided in the welding device can be loosely fitted, 8. The stud welding jig according to claim 7, wherein the stud welding jig is attached by loosely fitting the bolt into the elongated hole in a state where a member located at the lower end of the welding device body is inserted into the attachment hole.

9. The substantially cylindrical member is a substantially cylindrical main body having a notch in a portion of its circumferential surface; and a lid configured to cover the notch and a portion of a ceiling surface of the main body, 2. The stud welding jig according to claim 1, wherein the lid portion is formed by integrating a peripheral surface portion that covers the notch and a top plate portion that covers a portion of the ceiling surface, the lid portion is connected to the main body portion via a connecting member that functions as the opening and closing mechanism, and is configured to be freely movable laterally toward the outside of the main body portion with the connecting member as a fulcrum.

10. In the notch, an overlapping portion is provided between the main body portion and the lid portion, and the members overlap when the lid portion is closed, The stud welding jig according to claim 9, wherein the overlapping portions are provided on both sides of the notch in the width direction.

11. An insertion hole through which a member located at the lower end of the welding device body is inserted is formed on the ceiling surface of the main body, A plurality of elongated holes extending in a height direction are formed on the rear surface of the main body, into which bolts provided in the welding device can be loosely fitted, 11. The stud welding jig according to claim 10, wherein the stud welding jig is attached by loosely fitting the bolt into the elongated hole in a state where a member located at the lower end of the welding device body is inserted into the insertion hole.

12. A stud welding method in which the stud welding jig according to claim 4 is attached to a welding device and stud welding is performed, Lift the welding device and slide the stud welding jig downward to hold the stud on the welding device; With the stud held by the welding device, the welding device is lowered, and the tip of the stud is inserted into a ferrule that has been placed on the base material in advance, thereby pressing the stud against the base material; Stud welding is performed with the stud welding jig installed so as to surround the periphery of the welded portion of the stud, a stud welding method, characterized in that the stud after stud welding is removed from the welding device, and the welding device is pulled rearward, causing the second arc portion to open and close relative to the notch, and the stud is removed laterally from the stud welding jig.

13. A stud welding method in which the stud welding jig according to claim 8 is attached to a welding device and stud welding is performed, The tip of the stud is pressed against the lid portion, and the stud is held by the welding device while the lid portion is pressed down. With the stud held by the welding device, the welding device is lowered, and the tip of the stud is inserted into a ferrule that has been placed on the base material in advance, thereby pressing the stud against the base material; Stud welding is performed with the stud welding jig installed so as to surround the periphery of the welded portion of the stud, A stud welding method comprising removing the stud from the welding device after stud welding, pressing the stud against the lid, raising the welding device with the lid pressed down, and removing the stud vertically from the stud welding jig.

14. A stud welding method in which the stud welding jig according to claim 11 is attached to a welding device and stud welding is performed, Lift the welding device and slide the stud welding jig downward, and hold the stud in the welding device with the lid portion open. With the stud held by the welding device, the welding device is lowered, and the tip of the stud is inserted into a ferrule that has been placed on the base material in advance, thereby pressing the stud against the base material; The lid is closed, and stud welding is performed with the stud welding jig placed so as to surround the periphery of the welded portion of the stud. A stud welding method characterized in that the stud after stud welding is removed from the welding device, the stud is pressed against the lid portion, which presses the lid portion from inside the stud welding jig, thereby raising the welding device in this state where the lid portion is opened, and the stud is removed vertically from the stud welding jig.

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