Contact tip for welding

Abstract

This contact tip for welding comprises: a tip case; a power feeding tip that is housed in the tip case and feeds power by sandwiching a welding wire, which is supplied from one end, between the one end and the other end; and a guide that presses the power feeding tip from the one end side and is housed in the tip case, wherein the power feeding tip has a shape such that the outer diameter thereof from a pressing point pressed by the guide to a fulcrum that contacts the tip case increases from the pressing point to the fulcrum, and the power feeding tip is rotated around the fulcrum by pressure from the guide to sandwich the welding wire at the other end.

Description

Technical Field

[0001] The present disclosure relates to a contact tip for welding.

Background Art

[0002] Patent Document 1 discloses a welding torch including a contact tip for welding power supply made of a conductive member provided with a wire insertion hole for a supplied welding wire, and a tip cover that covers and houses the contact tip for welding power supply. The contact tip for welding power supply is disposed in the tip cover in a tiltable state in which a pair of half-chip members divided in a half shape in the axial direction of the wire insertion hole abut convex portions provided at the base ends of the pressure receiving portions of the half-chip members to expand and contract the distance between the respective tips of the half-chip members. Further, the welding torch has a tip tip-side biasing means for tilting so as to narrow the distance between the tips of the half-chip members and holding the power supply point to the welding wire on the tip side of the half-chip member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The present disclosure provides a contact tip for welding that suppresses variations in the clamping force of the welding wire at the power supply location and further improves the welding quality.

[0005] The present disclosure provides a welding contact tip including a chip case, a power supply chip that accommodates a welding wire supplied from one end side and sandwiches and supplies power to the welding wire at the other end opposite to the one end, and a guide that presses the power supply chip from the one end side and accommodates the power supply chip in the chip case. The power supply chip has a shape in which an outer diameter from a pressing point pressed by the guide to a fulcrum in contact with the chip case expands toward the fulcrum from the pressing point, and rotates about the fulcrum by the pressing by the guide to sandwich the welding wire at the other end.

[0006] According to the present disclosure, variations in the clamping force of the welding wire at the power supply location can be suppressed, and the welding quality can be further improved.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

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Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0008] (Background Leading to the Present Disclosure) In a conventional contact tip for welding power supply, an elastic member is arranged coaxially with the feeding direction of a welding wire, and a force point located at a pressure-receiving portion of a split tip member is pressed from behind by a tip retainer. By rotating (tilting) an action point located at the tip of the split tip member in the axial direction of a wire insertion hole about a fulcrum of a tip cover with which the pressure-receiving portion abuts, the welding wire is clamped at the tip of the split tip member.

[0009] Here, there is a demand for making the tip outer diameter of the contact tip for welding power supply smaller. When making the tip outer diameter of the contact tip for welding power supply smaller, it is necessary to make the rotation (tilting) amount of a pressure-receiving portion (force point) of the split tip member directed outward in the circumferential direction smaller. For this purpose, the distance between the force point and the fulcrum has to be made shorter than the distance between the fulcrum and the action point. Therefore, when making the distance between the force point and the fulcrum shorter, in the contact tip for welding power supply, since the clamping force of the welding wire at the action point decreases, it has been necessary to compensate for the decreased clamping force using an elastic member with a large spring constant. However, in the case of an elastic member, the variation in the spring constant of the elastic member becomes larger as the spring constant becomes larger. As a result, in the contact tip for welding power supply using an elastic member with a large spring constant, there has been a possibility that variations occur in the quality of welding (for example, displacement of the welding position, etc.).

[0010] Hereinafter, each embodiment specifically disclosing a contact tip for welding according to the present disclosure will be described in detail with reference to the drawings as appropriate. However, a more detailed description may be omitted as necessary. For example, a detailed description of well-known matters and a redundant description of substantially the same configuration may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate the understanding of those skilled in the art. Note that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and it is not intended to limit the subject matter described in the claims thereby.

[0011] First, referring to FIG. 1, the configuration of the contact tip 11 for welding will be described. FIG. 1 is a cross-sectional view of the contact tip 11 for welding according to the embodiment. The welding tip 13 shown in FIG. 1 is a cross-sectional view of the contact tip 11 for welding cut in the X-Z plane.

[0012] The contact tip 11 for welding includes a welding tip 13. The contact tip 11 for welding may be referred to as a collet tip. Further, the welding tip 13 is an example of a power supply tip and may be referred to as a power supply member, a collet, or the like.

[0013] The contact tip 11 for welding is attached to the tip of a welding torch (not shown) and feeds out the welding wire 15 toward the tip of the welding torch (wire feeding direction Q). The welding torch is used, for example, in consumable electrode type gas shielded arc welding or the like. A cylindrical shield gas supply nozzle (not shown) is arranged coaxially with the contact tip 11 for welding outside the radius of the contact tip 11 for welding.

[0014] The contact tip 11 for welding has, along the wire feeding direction Q, an upper tip base 17, an elastic member 19, a lower tip base 21, a guide 23, a tip case 25, and a welding tip 13. The contact tip 11 for welding has a coaxial structure in which the guide 23, the welding tip 13, and the tip case 25 are arranged coaxially with each other around the axis 15A of the welding wire 15.

[0015] The upper tip base 17 is attached to the tip of the body of the torch body (not shown) by screwing the screw portion 27 into the torch body of the welding torch. The welding wire 15 is inserted into a wire introduction hole 29 formed coaxially with the screw axis of the screw portion 27. The screw portion 27 is connected to the upper tip base 17 formed in a cylindrical shape.

[0016] A male screw portion 35 is formed on the outer periphery of the tip of the upper tip base 17. The upper tip base 17 is screwed and fixed to a female screw portion 37 provided on one end side of the lower tip base 21.

[0017] The upper chip base 17 has a housing portion 33 between the screw portion 27 and the guide upper surface 41, and an elastic member 19 (for example, a coil spring or the like) is housed in the housing portion 33.

[0018] The elastic member 19 is housed in the housing portion 33, one end abuts against the upper chip base 17, and the other end (on the wire feeding direction Q) side abuts against the guide upper surface 41 of the guide 23. The elastic member 19 biases the guide 23 in the wire feeding direction Q. Note that the elastic member 19 in the present embodiment has, for example, a spring constant = 7.8 N / mm, but is not limited thereto. The elastic member 19 may have a spring constant = 2.5 to 20 N / mm.

[0019] The lower chip base 21 has a guide housing portion 39 that houses the guide 23. The guide housing portion 39 houses the guide 23 movably in the wire feeding direction Q. Further, the lower chip base 21 is provided with a convex portion 43 over the circumferential direction inside the guide housing portion 39.

[0020] The guide 23 is formed with a wire guide hole 47 that guides the welding wire 15. The wire guide hole 47 is a through hole that is substantially coaxial with the wire introduction hole 29 formed in the screw portion 27, and the welding wire 15 is inserted therethrough. When the guide upper surface 41 of the guide 23 is biased in the wire feeding direction Q by the elastic member 19, the guide 23 moves in the wire feeding direction Q within the guide housing portion 39 and presses the welding tip 13.

[0021] Note that when the flange portion 45 of the guide 23 abuts against the convex portion 43 of the lower chip base 21, the movement of the guide 23 in the wire feeding direction Q is restricted.

[0022] The guide 23 has a tapered portion 49 that presses the welding tip 13 in the wire feeding direction Q. The tapered portion 49 has a tip outer diameter that decreases (i.e., tapers) toward the welding tip 13, and the tip surface 51 is formed substantially circular when viewed from the Z direction.

[0023] The lower chip base 21 has a female screw portion 53 formed on the other end side. The male screw portion 55 of the chip case 25 is screwed into the female screw portion 53 to fix the chip case 25 to the lower chip base 21.

[0024] The chip case 25 has a chip accommodation space 57 for accommodating the welding chips 13 (specifically, each of the first chip 63 and the second chip 65). The chip case 25 has a substantially frustum-shaped case tip portion 59 that tapers toward the wire feeding direction Q.

[0025] The case tip portion 59 communicates with the chip accommodation space 57 and is provided with a wire feeding hole 61 for feeding the welding wire 15 sent out from the welding chip 13 toward the outside of the welding contact chip 11. The wire feeding hole 61 is a tapered hole that expands in diameter toward the wire feeding direction Q or a cylindrical hole.

[0026] The welding contact chip 11 includes an elastic member 19 that biases the guide 23, a guide 23 that presses the welding chip 13 based on the biasing force of the elastic member 19, and a welding chip 13 that can feed the welding wire 15 toward the welding portion of the welding base material (not shown) while sandwiching the welding wire 15. They are arranged in the order of the elastic member 19, the guide 23, and the welding chip 13 along the wire feeding direction Q of the welding wire 15.

[0027] Next, with reference to FIGS. 2 to 4 respectively, the clamping of the welding wire 15 by the welding chip 13 will be described. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. 3 is a side view of the welding chip 13. FIG. 4 is a perspective view of the welding chip 13.

[0028] The side view of the welding chip 13 shown in FIG. 3 is a side view obtained by rotating the welding chip 13 shown in FIG. 2 by 180° around the axis 15A of the welding wire 15. The welding chip 13 shown in FIG. 4 shows a state in which the first chip 63 and the second chip 65 are combined.

[0029] Note that the cross-sectional view of the welding contact tip 11 shown in FIG. 2 is a cross-sectional view obtained by cutting the welding contact tip 11 in the X-Z plane in the same manner as in FIG. 1.

[0030] The welding tip 13 inserts the welding wire 15 fed from the wire guide hole 47 of the guide 23, and sends it out toward the tip of the welding contact tip 11 while clamping it at the tip (working point C). The welding tip 13 is composed of a combination of a first tip 63 and a second tip 65. Each of the first tip 63 and the second tip 65 is formed with wire insertion holes 67A and 67B that are bisected in two directions along the axis 15A direction.

[0031] The welding tip 13 forms one wire insertion hole through which the welding wire 15 can be inserted by the half-split wire insertion hole 67A provided in the first tip 63 and the half-split wire insertion hole 67B provided in the second tip 65 when the first tip 63 and the second tip 65 are combined.

[0032] Further, the first tip 63 has a slit 75 in which a bottom 85 having a substantially disk shape is cut out in the diameter direction on the wire feeding direction Q side.

[0033] The welding tip 13 rotates about a total of four fulcrum points A that come into contact with the tip case 25, with a total of four pressed points pressed by the guide 23 serving as force points B (see FIGS. 6 and 8). As a result, the tip portions (working point C) of the first tip 63 and the second tip 65 sandwich and clamp the welding wire 15 (see FIG. 2). Specifically, the welding tip 13 clamps the welding wire 15 at the position of the working point C by the first tip 63 rotating in the direction R1 and the second tip 65 rotating in the direction R2, respectively.

[0034] The welding tip 13 is formed with dimensions such that a first distance L1 between the force point B and the fulcrum point A and a second distance L2 between the fulcrum point A and the working point C satisfy L2 / 2 < L1.

[0035] The fulcrum A is located at the locking portions 69A and 69B having the maximum outer diameter of the welding tip 13 (that is, each of the first tip 63 and the second tip 65) centered on the axis 15A. Each of the first tip 63 and the second tip 65 has two points divided in the circumferential direction serving as the fulcrum A (see FIG. 4).

[0036] The welding tip 13 is locked to the convex portion 93 of the tip case 25 at each of the total four fulcrums A. Then, based on the pressing force by the guide 23, by rotating in the directions R1 and R2 around each two fulcrums A respectively, the welding wire 15 is clamped at the acting point C.

[0037] Each of the first tip 63 and the second tip 65 of the welding tip 13 has inclined portions 71A and 71B that widen radially outward from the force point B toward the fulcrum A in a side view seen from the X direction or the Y direction. The welding contact tip 11 forms a gap 91 (see FIGS. 9 and 10) between the inclined portions 71A and 71B and the inner wall surface 73 of the tip case 25 due to the inclined portions 71A and 71B. Note that the gap 91 will be described later.

[0038] As a result, it becomes difficult for the inclined portions 71A and 71B of the welding tip 13 and the inner wall surface 73 of the tip case 25 to interfere with each other. Also, the welding tip 13 can secure the respective movable ranges (that is, rotation angles) in the directions R1 and R2 around the respective fulcrums A of the first tip 63 and the second tip 65 even when the distance of the first distance L1 is increased as compared with the case where the inclined portions 71A and 71B are not formed. That is, the welding tip 13 can increase the clamping force on the welding wire 15 at the acting point C even when an elastic member 19 having a large spring constant is not used.

[0039] Therefore, the welding contact tip 11 can feed the supplied welding wire 15 to a predetermined welding location with higher precision by the welding tip 13 clamping the welding wire 15 with sufficient clamping force. That is, the welding contact tip 11 can improve the quality of welding.

[0040] FIG. 5 is a perspective view of the first chip 63. FIG. 6 is a perspective view of the first chip 63 obtained by rotating the first chip 63 shown in FIG. 5 by 90° around the axis 15A.

[0041] The first chip 63 includes: each of a pair of inclined surfaces 81A that contact the guide 23; a locking portion 69A that contacts the chip case 25 from each of the inclined surfaces 81A; an inclined portion 71A that extends radially outside the radius of the axis 15A from the inclined surfaces 81A toward the locking portion 69A; and a shaft portion 83 formed with substantially the same outer diameter from the locking portion 69A toward the slit 75. The shaft portion 83 is formed with a diameter smaller than that of the locking portion 69A having the maximum outer diameter in the first chip 63 around the axis 15A, and a substantially disk-shaped bottom portion 85 is formed on the -Z side of the action point C that sandwiches the welding wire 15.

[0042] A slit 75 that notches the bottom portion 85 in the diameter direction (X direction) is formed in the bottom portion 85. Due to the formation of the slit 75, the first chip 63 can prevent contact between the bottom portion 85 and the welding wire 15 that is sandwiched at the action point C and sent out through the wire delivery hole 61 at the tip of the case 59.

[0043] The first chip 63 has each of a pair of inclined surfaces 81A that extend radially outside the radius of the axis 15A on the wire delivery direction Q side. Each of the pair of inclined surfaces 81A is formed with a semi-cracked tapered guide receiving portion 79A whose opening diameter becomes smaller from the force point B that contacts the guide 23 toward the wire insertion hole 67A through which the welding wire 15 is inserted.

[0044] FIG. 7 is a side view of the second chip 65. FIG. 8 is a side view of the second chip 65 obtained by rotating the second chip 65 shown in FIG. 7 by 180° around the axis 15A.

[0045] A shaft portion 77 is formed between the locking portion 69B serving as the fulcrum A and the action point C in the second chip 65. The shaft portion 77 is formed with a diameter smaller than that of the locking portion 69B having the maximum outer diameter in the second chip 65 around the axis 15A.

[0046] The second chip 65 has a guide receiving portion 79B that contacts and is pressed by the guides 23 biased by the elastic member 19 at two force points B. The second chip 65 is formed with a tapered guide receiving portion 79B whose opening becomes smaller from the position of the force point B pressed by the guide 23 toward the wire insertion hole 67B.

[0047] The second chip 65 has respective ones of a pair of inclined surfaces 81B that spread toward the outer radius of the axis 15A on the wire delivery direction Q side. The pair of inclined surfaces 81B form a semi-cracked tapered guide receiving portion 79B whose opening diameter becomes smaller from the force point B that contacts the guide 23 toward the wire insertion hole 67B through which the welding wire 15 is inserted.

[0048] FIG. 9 is a cross-sectional view of the welding tip 13. The welding tip 13 shown in FIG. 9 is a cross-sectional view of the welding tip 13 cut in the Y-Z plane and is a cross-sectional view seen from the direction E shown in FIG. 2. FIG. 10 is an enlarged view of the main part of FIG. 9.

[0049] As shown in FIG. 9, the welding tip 13 pressed by the guide 23 has a distance between the fulcrum A of the first chip 63 and the fulcrum A of the second chip 65 (that is, the distance D2 between one locking portion 69A and one locking portion 69B facing each other with respect to the axis 15A) and the inner diameter D1 of the chip case 25 that are substantially the same size.

[0050] That is, in the welding tip 13, the inclined portions 71A and 71B expand toward the inner surface of the chip case 25 (that is, the outer radius of the axis 15A), and the maximum outer diameter is reached at each of the locking portions 69A and 69B. The distance D2 between one locking portion 69A and one locking portion 69B is substantially equal to the inner diameter D1 of the chip case 25.

[0051] The chip case 25 has a convex portion 93 between a hole portion 89 with an inner diameter D1 centered on the axis 15A and a chip accommodation space 57. Due to the inclination of the inclined portions 71A and 71B, the welding chip 13 is pressed by the guide 23 at the force point B, and in a state where each of the locking portions 69A and 69B that contacts the convex portion 93 contacts and is locked at the fulcrum A, a gap 91 is formed between the inclined portions 71A and 71B.

[0052] As a result, as the clamping portion (i.e., the point of action C) that clamps the welding wire 15 wears due to the feeding of the welding wire 15 in the welding contact chip 11, even if the amount of swing (rotation) centered on the fulcrum A increases, a swing (rotation) allowance for the amount of swing (rotation) is obtained due to the gap 91, so that the second distance L2 between the fulcrum A and the point of action C can be made smaller (L2 / 2 < L1). Also, in the welding contact chip 11, even if the amount of swing (rotation) centered on the fulcrum A increases due to the wear of the clamping portion (i.e., the point of action C), a swing (rotation) allowance for the amount of swing (rotation) is obtained due to the gap 91, so that the clamping of the welding wire 15 at the point of action C can be maintained.

[0053] Further, the convex portion 93 is connected to the hole portion 89, and a tapered surface 95 (an example of an inclined surface) is formed on the surface on the side where the locking portions 69A and 69B of the welding chip 13 are locked. The tapered surface 95 of the convex portion 93 viewed from the Z direction is formed such that the opening diameter becomes smaller toward the inner side of the radius of the axis 15A. Thereby, in the welding contact chip 11, the welding chip 13 pressed by the guide 23 is locked by the inclination of the convex portion 93, and the position of the welding chip 13 can be regulated.

[0054] As described above, the welding contact tip 11 according to the embodiment includes a tip case 25, a welding tip 13 (an example of a power supply tip) that is housed in the tip case 25 and sandwiches and supplies power to the welding wire 15 supplied from one end side at the other end opposite to the one end, and a guide 23 that presses the welding tip 13 from one end side and houses it in the tip case 25. The welding tip 13 has an outer diameter from the force point B (an example of a pressing point) pressed by the guide 23 to the fulcrum A in contact with the tip case 25 (that is, the outer diameters of the inclined portions 71A and 71B centered on the axis 15A) that expands from the force point B toward the fulcrum A, and rotates about the fulcrum A by the pressing by the guide 23 to sandwich the welding wire 15 at the other end (action point C).

[0055] As a result, the welding contact tip 11 according to the embodiment can feed out the welding wire 15 in the wire feeding direction Q while sandwiching the welding wire 15 at the other end (action point C) of the welding tip 13. Further, the welding tip 13 can maintain the clamping state even when the action point C is consumed, and can reduce the amount of Joule heat generation at the power supply point (action point C) in order to maintain a stable contact state with the welding wire 15. Therefore, in the welding contact tip 11, since the melting amount of the welding tip 13 itself at the power supply point (action point C) is reduced, the welding tip 13 can have a longer life.

[0056] Furthermore, between the force point B and the fulcrum A of the welding contact tip 11, the inclined portions 71A and 71B of the welding tip 13 expand toward the inner surface of the tip case 25 (that is, the outer radius of the axis 15A). Therefore, the swing (rotation) allowance of the welding tip 13 (that is, each of the first tip 63 and the second tip 65) centered on the fulcrum A can be increased. As a result, since the first distance L1 from the force point B to the fulcrum A of the welding tip 13 can be ensured, the welding contact tip 11 can make the clamping force on the welding wire 15 at the other end (action point C) of the welding tip 13 more stable without using an elastic member 19 with a large spring constant. Also, even if the welding tip 13 melts at the other end (action point C) of the welding contact tip 11, the welding tip 13 can swing by the amount of the swing (rotation) allowance, so that the welding wire 15 can be continuously clamped more stably. Therefore, the welding contact tip 11 can more effectively suppress the displacement of the welding wire 15 on the XY plane and improve the welding quality by suppressing the deviation from the welding location (position).

[0057] In addition, the welding contact tip 11 according to the embodiment further includes an elastic member 19 that biases the guide 23 in the supply direction of the welding wire 15. The elastic member 19, the guide 23, and the welding tip 13 are arranged in this order along the supply direction, that is, the elastic member 19, the guide 23, and the welding tip 13. As a result, in the welding contact tip 11 according to the embodiment, the guide 23 is biased toward the wire feeding direction Q by the elastic member 19, and the biased guide 23 presses the welding tip 13 at the force point B toward the wire feeding direction Q, so that the welding tip 13 can swing (rotate) around the fulcrum A and clamp the welding wire 15 at the action point C.

[0058] In addition, the welding tip 13 of the contact tip 11 for welding according to the embodiment is configured by combining at least two tips (each of the first tip 63 and the second tip 65). As a result, in the contact tip 11 for welding according to the embodiment, the half-cracked first tip 63 rotates in the direction R1 about the fulcrum A as the rotation center, and the second tip 65 rotates in the direction R2 about the fulcrum A as the rotation center, so that the welding wire 15 can be clamped at the point of action C. Each of the first tip 63 and the second tip 65 has a fulcrum A, a point of force B, and a point of action C at substantially the same position in a direction orthogonal to the axis 15A.

[0059] In addition, the outer diameter of the welding tip 13 at the fulcrum A of the contact tip 11 for welding according to the embodiment (that is, the distance D2 between one locking portion 69A and one locking portion 69B) is substantially equal to the inner diameter D1 of the tip case 25. As a result, in the contact tip 11 for welding according to the embodiment, the movement of the welding tip 13 in the direction orthogonal to the axis 15A is restricted, and rattling and displacement of the welding tip 13 in the tip case 25 can be suppressed.

[0060] In addition, the tip case 25 of the contact tip 11 for welding according to the embodiment has a convex portion 93 that contacts the welding tip 13 on the inner surface. The convex portion 93 has a tapered surface 95 (an example of an inclined surface) on the surface that contacts the welding tip 13. As a result, in the contact tip 11 for welding according to the embodiment, the surface of the convex portion 93 of the tip case 25 that contacts the welding tip 13 is formed by the tapered surface 95 that inclines toward the inner side of the radius of the axis 15A. Therefore, each of the locking portions 69A and 69B of the welding tip 13 is locked and positioned on this tapered surface 95. That is, the contact tip 11 for welding can restrict rattling and displacement of the welding tip 13 by the tapered surface 95 of the convex portion 93, and can reduce the displacement of the welding wire 15 in the feeding direction.

[0061] Furthermore, the welding contact tip 11 can be adjusted so that the wire guide hole 47 of the tip case 25 and the wire insertion hole of the welding tip 13 are substantially coaxial when the welding tip 13 is locked at the tapered surface 95. Thereby, the welding contact tip 11 can more effectively suppress the twisting and distortion of the welding wire 15 during the insertion of the wire guide hole 47 and the wire insertion hole.

[0062] Also, in the welding contact tip 11 according to the embodiment, the first distance L1 between the force point B and the fulcrum A and the second distance L2 between the fulcrum A and the point sandwiching the welding wire 15 satisfy L2 / 2 < L1. Thereby, the welding contact tip 11 according to the embodiment has a swing (rotation) allowance with the fulcrum A as the rotation center based on the inclination of the inclined portions 71A and 71B. Therefore, even when the second distance L2 is a distance that satisfies L2 / 2 < L1, that is, L2 < L1×2, the welding wire 15 can be clamped at the action point C.

[0063] Also, the spring constant of the elastic member 19 of the welding contact tip 11 according to the embodiment is 2.5 to 20 N / mm. Thereby, the welding contact tip 11 according to the embodiment does not use an elastic member 19 with a large spring constant, and by suppressing the variation in the spring constant of the actual elastic member 19, the welding wire 15 can be more stably clamped at the action point C. When the spring constant of the elastic member 19 is 2.5 N / mm or less, the welding contact tip 11 may not be able to stably clamp the welding wire 15 even if the above-described doubling effect is obtained.

[0064] As described above, various embodiments have been described with reference to the drawings, but it goes without saying that the present disclosure is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples, correction examples, substitution examples, addition examples, deletion examples, and equivalent examples within the scope described in the claims, and it is naturally understood that they also belong to the technical scope of the present disclosure. Also, within the scope not departing from the gist of the invention, the components in the above-described various embodiments may be arbitrarily combined.

Industrial Applicability

[0065] The present disclosure is useful as a welding contact tip that suppresses variations in the clamping force of a welding wire at a power supply location and further improves welding quality.

Explanation of Signs

[0066] 13 Welding tip 15 Welding wire 19 Elastic member 23 Guide 25 Tip case 95 Tapered surface A Fulcrum B Force point C Point of application

Claims

1. A chip case, a power supply chip that is housed in the chip case and sandwiches and supplies power to a welding wire supplied from one end side at the other end opposite to the one end, a welding contact chip comprising: a guide that presses the power supply chip from the one end side and houses it in the chip case, wherein the power supply chip, has a shape in which an outer diameter from a pressing point pressed by the guide to a fulcrum that contacts the chip case expands toward the fulcrum from the pressing point, rotates about the fulcrum by the pressing by the guide, and sandwiches the welding wire at the other end, is a welding contact chip.

2. further comprising an elastic member that biases the guide in the supply direction of the welding wire, wherein the elastic member, the guide, and the power supply chip are arranged in this order of the elastic member, the guide, and the power supply chip along the supply direction, is the welding contact chip according to Claim 1.

3. the power supply chip is configured by combining at least two chips, is the welding contact chip according to Claim 1.

4. an outer diameter of the power supply chip at the fulcrum is substantially equal to an inner diameter of the chip case, is the welding contact chip according to Claim 1.

5. the chip case has a convex portion that contacts the power supply chip on an inner surface, wherein a surface of the convex portion that contacts the power supply chip is an inclined surface, is the welding contact chip according to Claim 1.

6. a first distance L1 between the pressing point and the fulcrum and a second distance L2 between the fulcrum and a point that sandwiches the welding wire satisfy L2 / 2 < L1, is the welding contact chip according to Claim 1.

7. a spring constant of the elastic member is 2.5 to 20 N / mm, is the welding contact chip according to Claim 2.

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