JP5626994B2 - Insert tip and plasma torch - Google Patents

Description

  The present invention relates to a plasma torch insert tip and a plasma torch using the insert tip.

  Patent Document 1 describes a nozzle shape that improves the cross-sectional shape of a keyhole by plasma keyhole welding. Patent Document 2 describes simultaneous tanning welding by each torch in which two arc welding torches are arranged so that the arrangement of electrode tips is orthogonal to the welding line direction so as to form one molten pool. Has been. Patent Document 3 describes a composite welding method in which keyhole welding is performed by irradiating a molten pool of 0 to 2 mm ahead of the arc welding target position with laser (FIGS. 4, 0024, 0025). Patent Document 4 describes a laser welding method in which non-penetrating welding is performed with a preceding first laser beam, and through-hole (keyhole) welding is performed with a second laser beam while focusing on a hole opening formed thereby.

JP-A-8-10957 JP-A-6-155018 JP 2004-298896 A JP 2008-126315 A Japanese Patent Application No. 2009-201304 Japanese Patent Application No. 2010-264955

The cross section of the plasma arc of the conventional plasma arc welding by 1 torch is substantially circular. Since keyhole welding by plasma arc is impossible if the plate thickness is less than 3 mm, tanning welding (heat conduction type welding) is adopted.
B) Undercut occurs,
B) Hot cracking due to wide beads is likely to occur. In high-speed welding, the current is a high current and a wide arc, so a wide, shallow bead shape is formed, and high temperature cracking is likely to occur during solidification.

  In conventional plasma arc welding with one torch, if the speed of keyhole welding is increased at a plate thickness of 3 to 10 mm, the bead shape can be raised with a convex shape with a raised central part and an undercut with a lowered edge, which increases the speed. Is difficult. Although there is a one-pool speedup with two torches, torches must be tilted greatly to make a one-pool, and the arc is easily disturbed and unstable due to the attracting arc force and magnetic blown by tilting.

Accordingly, the present inventors have provided an insert tip capable of realizing high-speed welding without hot cracking or undercut with a stable arc, and a plasma torch using the insert tip.

  This is an insert tip comprising two electrode arrangement spaces and two nozzles that are distributed on the same diameter line and communicate with each electrode arrangement space and open to face a welding line parallel to the diameter line. And a plasma torch equipped with the chip and having each electrode inserted into each electrode arrangement space.

  According to the plasma torch equipped with this insert tip, one pool two arc welding can be performed in which one arc is formed by two arcs. Since the cross section of the plasma arc is a heat source that is long and thin in the welding progress direction (y), the bead width (x direction) with respect to the amount of heat is kept narrow, and hot cracking does not occur even if the speed is increased. Moreover, a front bead can be made flat by setting it as one pool 2 arc. Although a somewhat similar effect can be obtained by parallel welding using two plasma torches separated by a certain distance, the arc distance in the welding direction is widened, so a workpiece with a short welding length (base material: material to be welded) ) Cannot be welded in the same pass, requires two-pass welding, and high speed is difficult. Further, since the arc interval is wide, the succeeding arc must remelt the bead once solidified, and high heat input is required for the subsequent welding. According to the one-pool two-arc welding using the insert tip provided with two nozzles per tip presented in Patent Document 5, the nozzle interval is short, so these problems are solved.

  By the way, in two arc plasma welding with one insert tip, the heat load applied to the insert tip becomes large. In order to increase the speed, it is necessary to improve the cooling capacity of the insert tip.

Accordingly, the present inventors have provided an insert tip having a high cooling capability that can perform welding without a high-temperature crack or undercut with a stable arc at a higher speed (Patent Document 6). This insert tip intersects two electrode arrangement spaces, two nozzles respectively communicating with each electrode arrangement space, and a plane in which the two nozzles are distributed at an intermediate point between the two nozzles. A V-shaped cooling water flow path is provided which is flat and the cooling water is turned back. Thereby, the cooling water smoothly turns back near the tip end surface (base material facing surface), the water or bubbles do not stay locally, and the chip cooling ability is high. A V-shaped cooling water flow path can be formed at low cost by making a hole obliquely with respect to the end surface of the chip and intersecting at the tip. Therefore, welding can be performed at higher speed by increasing the welding power. Patent Document 6 also presented an insert chip in which a pair of nozzle members are detachably coupled to a chip base. According to this, when the nozzle part at the lower end of the nozzle member is deformed or damaged by high heat, the nozzle member can be replaced with a new one, and the chip base can be used as it is, so that the maintenance cost can be reduced.

  The present invention relates to an improvement of an insert chip that detachably couples a plurality of nozzle members to a single chip base. The first object of the present invention is to increase the cooling capacity of each nozzle member. The second object is to enable the third object, and the third object is to facilitate and simplify the operation of joining the nozzle member with the nozzle directivity direction predetermined with respect to the chip substrate.

(1) There is a cap portion (21a, 21b) in which the nozzle (3a, 3b) is opened at the center, a trunk portion (22a, 22b) continuous to the cap portion, and a male screw portion (24a, 24b) continuous to the trunk portion. A plurality of nozzle members (20a, 20b) having a sealing material (23a, 23b) between the trunk portion and the male screw portion, and having an electrode arrangement space (2a, 2b) communicating with the nozzle inside;
Each nozzle member insertion hole (18a, 18b) through which the male threaded portion of each nozzle member passes through the trunk portion, and the cap portion of each nozzle member inserted through each nozzle member insertion hole abuts the tip flat surface (1d, 1e) Refrigerant circulation holes (1f, 1g), refrigerant receiving holes (1h), refrigerant outlet holes (1i) that form part of the nozzle member insertion hole and form a refrigerant flow space with the trunk portion. , A refrigerant through hole (1j) connecting the adjacent refrigerant circulation holes, a refrigerant through hole (1k) connecting one of the refrigerant circulation holes (1f) to the refrigerant receiving hole, and another of the refrigerant circulation holes A chip substrate (1) having a refrigerant through hole (1l) connecting one (1g) to the refrigerant outlet hole; and
Coupling means (25a, 25b) for fixing the nozzle member inserted into the nozzle member insertion hole to the chip base;
Insert chip comprising.

  In addition, in order to facilitate understanding, in parentheses, the correspondence of the examples shown in the drawings and described later, or the symbols or corresponding matters of corresponding elements are added for reference. The same applies to the following.

  According to the plasma torch equipped with this insert tip (1), it is possible to weld one pool plural arcs, which forms one molten pool by plural arcs. For example, when welding one pool 2 arc, in which one arc is formed by two arcs, the cross section of the plasma arc becomes a heat source that is long and thin in the welding direction (y). (x direction) is kept narrow, and even when the speed is increased, hot cracking does not occur. Moreover, by setting it as one pool 2 arc, in plate | board thickness 3-10mm, a keyhole welding can be carried out by a preceding arc, and a wide tanning welding can be carried out by a subsequent arc, and a surface bead can be made flat. If the plate thickness is less than 3 mm, it is possible to carry out digging welding with a leading arc and flatten the front bead with a trailing arc.

  Although a somewhat similar effect can be obtained by parallel welding using two plasma torches separated by a certain distance, the arc interval in the welding progress direction becomes wide, so with a work with a short weld length (material to be welded) It is impossible to weld in the same pass, two-pass welding is required, and high speed is difficult. Further, since the arc interval is wide, the succeeding arc must remelt the bead once solidified, and high heat input is required for the subsequent welding. According to the one-pool multiple arc welding using the insert tip of the present invention having a plurality of nozzle members in one tip, the nozzle interval is short, so these problems are solved.

  In addition, since the coolant (cooling water) flows in contact with the outer peripheral surface of the trunk portion (22a, 22b) of each nozzle member (20a, 20b) in the coolant circulation hole (1f, 1g) of the chip base (1), each nozzle The cooling capacity of the members (20a, 20b) is high. In addition, in the chip base (1), a refrigerant receiving hole (1h), a refrigerant through hole (1k) connecting one of the refrigerant circulation holes (1f), a refrigerant through hole (1j) connecting adjacent refrigerant circulation holes, and the like Since the refrigerant flows through the refrigerant through hole (1l) connecting the refrigerant circulation hole (1g) to the refrigerant outlet hole (1i), the cooling capacity of the chip base (1) is also high.

  Therefore, welding can be performed at higher speed by increasing the welding power. When the nozzle portion at the lower end of the nozzle member is deformed or damaged by high heat, the nozzle member can be replaced with a new one, and the chip base can be used as it is, thereby reducing the maintenance cost.

It is the top view which looked down at the inside of the outer cylinder of the plasma torch of the 1st example of the present invention. It is the II-II sectional view taken on the line of the plasma torch shown in FIG. It is the III-III sectional view taken on the line of the plasma torch shown in FIG. 2A is a bottom view of the tip of the plasma torch shown in FIG. 2 as viewed in the IVa-IVa line direction, FIG. 2B is a bottom view of the plasma torch as viewed in the IVb-IVb line direction shown in FIG. It is the cross-sectional view looked down at the IVc-IVc line direction shown in FIG. FIG. 2A is a longitudinal sectional view showing the insert tip and inner cap 6 at the tip of the plasma torch shown in FIG. 2 removed from the torch body, and FIG. 2B shows only the chip base 1 and the inner cap 6 shown in FIG. (C) is a front view (outside view) showing nuts 25a and 25b shown in (a) removed from the nozzle members 20a and 20b, the nozzle member being extracted from the chip base 1, and the nuts 25a and 25b. (A1) is an enlarged front view showing the nozzle member 20a shown in (c) of FIG. 5, (a2) is a longitudinal sectional view of the nozzle member 20a, and (a3) is a bottom view of the nozzle member 20a. (B1) is a front view showing a first modified nozzle member 20c that can be mounted on the chip substrate 1 by replacing one or both of the nozzle members 20a and 20b shown in FIG. 2, and (b2) is a longitudinal section of the nozzle member 20c. A plan view, (b3) is a bottom view of the nozzle member 20c. (C1) is a front view showing a second modified nozzle member 20d that can be mounted on the chip substrate 1 by replacing one or both of the nozzle members 20a and 20b shown in FIG. 2, and (c2) is a longitudinal section of the nozzle member 20d. A front view, (c3) is a bottom view of the nozzle member 20d.

  (1a) The coupling means includes the male screw portion of the nozzle member and a female screw hole that forms a part of the nozzle member insertion hole (18a, 18b) and is screw-coupled to the male screw portion; Insert chip as described. According to this, by forming a female screw hole in which the male screw portion is screw-coupled to the chip base (1), the nozzle member can be easily attached and detached without screwing the chip base by deformation.

  (2) The coupling means includes a nut for screwing into the male thread portion of the nozzle member inserted into the nozzle member insertion hole (18a, 18b) of the chip base (1) and tightening the chip base in cooperation with the nozzle member ( 25a, 25b); the insert tip according to (1) above.

  (3) The above (1) or (1), further comprising an engaging means (26a, 26b, 1c) for preventing the nozzle member (20a, 20b) from rotating about the central axis with respect to the chip base (1). The insert tip according to (2).

  (4) The engaging means includes a cut-out surface (26a, 26b) obtained by partially removing the side surface of the cap portion (21a, 21b) of the nozzle member (20a, 20b), and the tip base (1). The insert according to (3), further comprising: a tip protrusion (1c) having a locking surface at an intermediate point between adjacent nozzle member insertion holes (18a, 18b) with which the notch surfaces (26a, 26b) abut. Chip.

  (5) At least one of the nozzle members has nozzles (3a, 3b) concentric with the central axis of the nozzle member (a1 to a3 in FIG. 6); any one of (1) to (4) above Insert chip as described in.

(6) At least one of the nozzle members (20c) is a center of the chip base that is equidistant from the central axis of the plurality of nozzle member insertion holes (18a, 18b) in the welding direction and parallel to the central axis. axis, with the nozzles (3c) which is inclined in a direction away pressurized et (b1 to b3 in FIG. 6); (1) to insert the chip according to any one of (4).

(7) At least one of the nozzle members (20d) is a center of the chip base that is equidistant from the central axis of the plurality of nozzle member insertion holes (18a, 18b) in the welding direction and parallel to the central axis. The insert tip according to any one of (1) to (4) above, having a nozzle (3d) inclined in a direction approaching the shaft (c1 to c3 in FIG. 6).

  (8) The insert tip according to any one of the above (1) to (7), and the electrode (12a, 12b) in which each tip portion is inserted into each electrode arrangement space (2a, 2b) of the insert tip And a plasma torch (FIG. 2).

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

-1st Example-
FIG. 1 shows the inside of the outer cylinder 14 of the plasma torch according to the first embodiment, that is, the plasma arc torch of the first embodiment as viewed from above, and FIG. 2 shows a longitudinal section in the direction of II-II line in FIG. Show the surface. The plasma arc torch of the first embodiment is of a form that performs plasma welding. Referring to FIG. 2, the chip base 1 of the insert chip is fixed to the chip base 5 by screwing the insert cap 6 to the chip base 5. The chip base 5 is fixed to the insulating body 7, and the electrode bases 10 a and 10 b and the insulating spacer 11 are fixed to the insulating body 7.

  The shield cap 8 is fixed to the insulating body 7. The first electrode base 10a and the second electrode base 10b separated in the diameter direction of the outer cylinder 14 by two are separated by an insulating spacer 11.

  The insert tip of the present embodiment is one in which two nozzle members 20a and 20b are mounted on the tip base 1. Referring to FIG. 5 showing details, each nozzle member 20a and 20b has a nozzle 3a and a nozzle 3a in the center. There are shade portions 21a and 21b opened by 3b, trunk portions 22a and 22b continuing to the shade portions, and external thread portions 24a and 24b continuing to the trunk portion, and an O-ring 23a which is a seal material between the trunk portion and the external thread portion , 23b, and electrode arrangement spaces 2a, 2b communicating with the nozzles 3a, 3b.

In the chip base 1, the nozzle member insertion holes 18a and 18b through which the male threaded portion to the trunk portion of the nozzle members are inserted, and the cap portions of the nozzle members inserted through the nozzle member insertion holes contact the tip planes 1d and 1e. Cooling water circulation holes 1f, 1g, water receiving holes 1h (FIG. 4) , water outlet holes 1i, which form part of the nozzle member insertion hole and form a cooling water flow space with the trunk, which are closed by contact . There are a lateral water hole 1j that connects the matching cooling water circulation holes, a horizontal water hole 1k that connects the cooling water circulation hole 1f to the water receiving hole 1h, and a horizontal water hole 1l that connects the cooling water circulation hole 1g to the water outlet hole 1i.

  In this embodiment, as shown in FIG. 5A, the nut members 25a and 25b are screwed to the male screw portions 24a and 24b of the nozzle members 20a and 20b and are fastened to the chip base 1 to thereby fix the nozzle members 20a and 20b. Are bonded to the chip substrate 1.

  Referring to FIG. 2 again, the electrode arrangement spaces 2a and 2b of the nozzle members 20a and 20b are distributed on the same diameter line (y) orthogonal to the central axis (z) of the chip base 1, and are equidistant from the central axis. Thus, it extends parallel to the central axis (z). In this embodiment, the nozzles 3a and 3b continuing to the electrode arrangement spaces 2a and 2b are concentric with the central axis of the electrode arrangement spaces 2a and 2b and face a base material (not shown). In the present embodiment, these nozzles 3a and 3b are also distributed on the same diameter line (y) perpendicular to the central axis (z) of the chip base (outer cylinder 14), parallel to the central axis and equidistant from the central axis. is there.

  A first electrode 12a and a second electrode 12b, each having a tip inserted into each electrode arrangement space 2a and 2b, pass through the insulating body 7, and are fixed to each electrode base 10a and 10b with screws 13a and 13b. Centering stones 9a and 9b are positioned at the axial center positions of 2a and 2b. Nozzles 3a and 3b connected to the electrode arrangement spaces 2a and 2b are opened on the tip surface (lower end surface) of the chip base 1 facing the base material (not shown). The direction in which the straight line (y) connecting the nozzles 3a and 3b extends is the welding direction. The tip base 1 is wide in the direction (welding direction) in which the straight line (y) extends, as shown in FIG. 2, but the direction (x) perpendicular to the straight line (y), that is, the width of the groove to be welded. The direction is wedge-shaped, and the side surfaces are inclined surfaces 1a and 1b (FIG. 4A).

Referring also to FIG. 4 (a) showing the tip surface of the torch (the lower end surface where the nozzle is open in FIG. 2),
There is a tip projection 1c at the center axis position of the tip of the tip base 1, and a tip plane 1d that faces the back surfaces of the caps 21a, 21b of the nozzle members 20a, 20b on both sides of the tip projection 1c in the y direction as the welding direction. There is 1e. There are nozzle member insertion holes 18a and 18b (FIG. 5B) at the center positions of the respective tip planes 1d and 1e. The notch surfaces 26a and 26b obtained by removing a part of the arc in a straight line from the cap portions 21a and 21b of the nozzle members 20a and 20b inserted into the nozzle member insertion holes 18a and 18b are the side surfaces of the tip protrusion 1c. Contact the surface exactly. That is, it engages. Thereby, the rotation of the nozzle members 20a and 20b with respect to the chip base 1 around the central axis is prevented. This engagement is achieved when the nozzle members 20a and 20b are inserted into the chip base 1 and screwed with the nuts 25a and 25b and fixed, and the nozzle members 20a and 20b are prevented from rotating. It functions as a detent for the nozzle members 20a, 20b when the nuts 25a, 25b are loosened to be removed from the nozzle 1. This engagement further has a function of fixing (setting) the inclination direction of the nozzle shaft of the nozzle members 20c and 20d (FIG. 6) whose nozzle shaft is inclined with respect to the chip base central axis (z) in the welding direction (y). There is also.

  The portions of the nozzle member insertion holes 18a, 18b on the tip planes 1d, 1e side are large-diameter cooling water circulation holes 1f, 1g, and the outer circumferences of the cooling water circulation holes 1f, 1g and the trunk portions 22a, 22b penetrating therethrough. A cooling water flow space (refrigerant flow space) is formed between the surfaces.

  FIG. 4C shows a cross section of the chip substrate 1 (IVc-IVc line cross section in FIG. 2). The chip base 1 includes a water receiving hole 1h, a water outlet hole 1i, a lateral water hole 1j that connects the cooling water circulation holes 1f and 1g, a horizontal water hole 1k that connects the cooling water circulation hole 1f to the water receiving hole 1j, and cooling. There is a lateral water hole 1l that connects the water circulation hole 1g to the water outlet hole 1i.

  FIG. 3 shows a longitudinal section in the direction of line III-III in FIG. The water receiving hole 1h of the chip base 1 communicates with the water flow pipe 16a, and the water outlet hole 1i communicates with the water flow pipe 16b. Referring also to FIG. 4 (c), the cooling water injected into the water flow pipe 16a enters the water receiving hole 1h of the chip base 1 through the electrode base 10a, the insulating body 7 and the water flow path of the chip base 5, and has a hole. It reaches the bottom, and then enters the cooling water flow space between the water circulation hole 1f and the outer peripheral surface of the trunk portion 22a through the horizontal water flow hole 1k, and then passes through the horizontal water flow hole 1j and passes through the water circulation hole 1g. Enters the cooling water flow space between the main portion 22b and the outer peripheral surface of the trunk portion 22b, then enters the water outlet hole 1i through the lateral water passage hole 11 and flows to the water flow pipe 16b and flows out of the torch.

  While the cooling water flows through the cooling water flow space between the water circulation hole 1f and the outer peripheral surface of the trunk portion 22a and the cooling water flow space between the water circulation hole 1g and the outer peripheral surface of the trunk portion 22b, the nozzle The trunk portions 22a and 22b of the members 20a and 20b are effectively cooled, and the cooling water is supplied to the water receiving hole 1h, the lateral water passage hole 1k, the water circulation hole 1f, the lateral water passage hole 1j, the water circulation hole 1g, and the lateral water passage hole. Since the chip base 1 is effectively cooled while it flows through 11 and the water outlet hole 1i, the cooling capacity of the insert chip is high. The nozzle members 20a and 20b are most heated during welding, but the outer peripheral surfaces of the nozzle members 20a and 20b are cooled by direct contact with cooling water, so that the service life of the nozzle members 20a and 20b is long.

  Referring again to FIGS. 1 and 2, the pilot gas enters the electrode arrangement spaces 2a and 2b through the pilot gas pipes 15a and 15b and the electrode insertion space, becomes plasma at the electrode tip, and passes through the nozzles 3a and 3b. Erupt from the tip of the torch. The shield gas passes through the shield gas pipe 17 and enters the cylindrical space between the inner cap 7 and the shield cap 8 and is ejected from the tip of the torch toward a base material (not shown).

  A pilot arc is generated between each electrode 12a, 12b and the chip 1 by each pilot power source (not shown), and a plasma arc current is passed between the electrodes 12a, 12b and the base material, the electrode side being negative and the base material side being positive. A welding arc (plasma arc) by a plasma power source (for welding or preheating) that feeds the preceding electrode 12a in the welding direction and a plasma power source (for tanning welding or main welding) that feeds the following electrode 12b in the welding direction Is generated, a plasma arc current flows between the electrodes 12a and 12b and the base material, thereby realizing 1 pool 2 arc welding. In this welding mode, welding or preheating by the plasma arc of the electrode 12a and tanning welding or main welding by the electrode 12b are performed. That is, a plasma pool of tanning welding or main welding hits the molten pool generated by welding or preheating with the preceding electrode 12a and the subsequent electrode 12b, and sends the molten pool formed by, for example, keyhole welding backward, Subsequent tanning welding levels the molten bead formed by keyhole welding. Thereby, it becomes a tanning weld bead smoothly connected to the base material surface. In the case of a thin plate of less than 3 mm, since keyhole welding is impossible, a bead is formed by preceding welding or preheating, and this is changed to a smooth bead by subsequent tanning welding. Unlike conventional high-current one-pool wide welding, high-speed welding with a narrow bead width can be performed with the lowest necessary minimum current by dividing the functions into the preceding and following functions. The speed can also be increased by using the leading arc as preheating and performing the main welding with the trailing arc. In either case, since the cooling ability of the insert tip, particularly the nozzle member that is easily burned out, is high, welding power can be increased and welding can be performed at a higher speed.

-Second Example-
6 (b1) shows the front appearance of the first modified nozzle member 20c used in place of the nozzle member 20a and / or 20b shown in FIG. 2, and FIG. 6 (b2) shows the longitudinal section of the nozzle member 20c. FIG. 6 (b3) shows the bottom surface (tip surface) of the nozzle member 20c. The central axes of the nozzles 3a and 3b of the nozzle members 20a and 20b shown in FIG. 2 are concentric with the central axis of the nozzle member. However, since the nozzle 3c of the nozzle member 20c is inclined with respect to the central axis of the nozzle member 20c, when the nozzle member 20c is mounted on the chip base 1, the notch surface 26c is formed on the tip protrusion 1c of the chip base 1. In the engaged state, the central axis of the nozzle 3c is inclined in a direction away from the central axis of the chip base (the intermediate point of the nozzle member insertion hole). That is, it is inclined to the front side (in the case of a leading nozzle) or the rear side (in the case of a trailing nozzle) in the welding direction (y) with respect to the center axis of the chip base 1, and Welding with a wider distance is possible.

-Third Example-
FIG. 6 (c1) shows the front appearance of the nozzle member 20d of the second modification used in place of the nozzle member 20a and / or 20b shown in FIG. 2, and FIG. 6 (c2) shows the nozzle member 20d. A longitudinal section is shown in FIG. 6 (c3), which shows the bottom surface (tip surface) of the nozzle member 20d. Since the nozzle 3d of the nozzle member 20d is inclined in the direction opposite to the nozzle 3c with respect to the central axis of the nozzle member 20d, when the nozzle member 20d is attached to the chip base 1, the notch surface 26d becomes the chip base 1 The center axis of the nozzle 3d is inclined in a direction approaching the center axis of the chip base 1 (the middle point of the nozzle member insertion hole) in a state of being engaged with the tip protrusion 1c. That is, it is inclined so as to approach the central axis of the chip base 1 in the welding direction (y), and welding that narrows the distance between the electrodes (the distance between the front and rear welding points) becomes possible.

In addition, as an insert chip in which the nozzle member is mounted on the chip base 1,
(1) Embodiment of the embodiment shown in FIG.
(2) A mode in which the nozzle member 20a shown in FIG. 2 is replaced with a nozzle member 20c, and the nozzle member 20c is a leading nozzle in the welding direction (y),
(3) A mode in which the nozzle member 20a shown in FIG. 2 is replaced with a nozzle member 20c, and the nozzle member 20c is used as a subsequent nozzle,
(4) A mode in which the nozzle members 20a and 20b shown in FIG.
(5) A mode in which the nozzle member 20a shown in FIG. 2 is replaced with a nozzle member 20d, and the nozzle member 20d is a preceding nozzle,
(6) A mode in which the nozzle member 20a shown in FIG. 2 is replaced with a nozzle member 20d, and the nozzle member 20d is a subsequent nozzle,
(7) A mode in which the nozzle members 20a and 20b shown in FIG.
(8) A mode in which the nozzle members 20a and 20b shown in FIG. 2 are replaced with the nozzle members 20c and 20d, and the nozzle member 20c is a preceding nozzle, and
(9) A mode in which the nozzle members 20a and 20b shown in FIG. 2 are replaced with the nozzle members 20c and 20d, and the nozzle member 20d is a preceding nozzle,
There is. Any of the above aspects (1) to (9) can be selected in accordance with the thickness of the plate to be welded and the desired welding current, welding speed and welding quality (for example, the desired bead shape).

1: Chip base 1a, 1b: Inclined surface 1c: Tip protrusion 1d, 1e: Tip flat surface 1f, 1g: Water circulation hole 1h: Water receiving hole 1i: Water outlet hole 1j, 1k, 11: Transverse water holes 2a to 2d: Electrode arrangement spaces 3a to 3d: Nozzle 5: Tip base 6: Inner cap 7: Insulating body 8: Shield cap 9a, 9b: Centering stone 10a, 10b: Electrode base 11: Insulating spacers 12a, 12b: Electrodes 13a, 13b: Pressers Screw 14: Outer cylinder 15a, 15b: Pilot gas pipe 16a, 16b: Water flow pipe 17: Shield gas pipe 18a, 18b: Nozzle member insertion holes 20a-20d: Nozzle members 21a-21d: Cap portions 22a-22d: Trunk portions 23a- 23d: O-rings 24a to 24d: male screw portions 25a, 25b: nuts 26a to 26d: notched surfaces

Claims (8)

There is a cap portion with an open nozzle in the center, a trunk portion that continues to the cap portion, and a male screw portion that continues to the stem portion, and there is a sealing material between the trunk portion and the male screw portion, and an electrode arrangement that communicates with the nozzle inside A plurality of nozzle members having a space;
Each nozzle member insertion hole through which the male screw portion of each nozzle member passes through the trunk portion, and the nozzle member insertion hole that is closed when the cap portion of each nozzle member inserted into each nozzle member insertion hole comes into contact with the tip plane. A refrigerant circulation hole, a refrigerant receiving hole, a refrigerant outlet hole, a refrigerant through hole connecting the adjacent refrigerant circulation holes, and one of the refrigerant circulation holes. A chip base having a coolant through hole connected to the coolant receiving hole, and a coolant through hole connecting the other one of the coolant circulation holes to the coolant outlet hole; and
Coupling means for fixing the nozzle member inserted into the nozzle member insertion hole to the chip base;
Insert chip comprising.   2. The insert chip according to claim 1, wherein the coupling means is a nut that is screwed into the male screw portion of the nozzle member inserted through the nozzle member insertion hole of the chip base and tightens the chip base in cooperation with the nozzle member.   The insert chip according to claim 1, further comprising an engagement unit that prevents the nozzle member from rotating about the central axis with respect to the chip base.   The engaging means includes a notch surface in which a side surface of the cap portion of the nozzle member is partially deleted, and a latch in which the notch surface abuts at an intermediate point between adjacent nozzle member insertion holes of the chip base. The insert tip according to claim 3, wherein the insert tip has a surface.   The insert tip according to any one of claims 1 to 4, wherein at least one of the nozzle members has a nozzle concentric with a central axis of the nozzle member. At least one of said nozzle member, a equidistant from the central axis of the plurality of nozzle member insertion hole in the welding direction central axis and parallel to the central axis of the chip substrate, the nozzle is inclined in a direction away pressurized et al The insert tip according to any one of claims 1 to 4. At least one of the nozzle members has a nozzle that is equidistant from the central axis of the plurality of nozzle member insertion holes in the welding direction and is inclined in a direction approaching the central axis of the chip base parallel to the central axis. An insert tip according to any one of claims 1 to 4;
  A plasma torch comprising: the insert tip according to any one of claims 1 to 7; and an electrode having a tip portion inserted into each electrode arrangement space of the insert tip.

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