JP2014028378A - Electroslag welding nozzle, and welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain an increase in welding wire feeding resistance by guiding to an insert tip by obliquely bending a welding wire to a central axis of a nozzle cylinder of electroslab welding by a tip joint.SOLUTION: An electroslab welding nozzle comprises a nozzle cylinder 50, a tip joint 45 installed in the nozzle cylinder and an insert tip 48 installed in the tip joint, and guides welding wire to a molten metal pool of the electroslab welding, and a wire insertion hole 46 of the tip joint 45 continues with a wire insertion hole of the nozzle cylinder, but is inclined to a central axis of the nozzle cylinder, and is inclined in an inverse direction, and continues with a wire insertion hole inclined to the central axis of the nozzle cylinder of the insert tip 48.

Description

  The present invention inserts a nozzle, which is a cylindrical electrode through an electroslag welding wire, into a space between the inner surface of a steel side plate and the end surface of a steel diaphragm facing the steel plate, thereby forming a weld metal pond below the lower end of the nozzle. The present invention relates to electroslag welding in which a nozzle is pulled up to fill the space with weld metal, and more particularly to a tip joint for guiding a welding wire to an insert tip of the nozzle.

  Steel box columns of steel buildings are made by welding diaphragms at required intervals to skin plates, which are side plates. For example, as shown in FIG. 4, the diaphragm is welded by inserting a nozzle through an electroslag welding wire into a three-dimensional space between the skin plate and the diaphragm (space to be welded) surrounded by gold. The nozzle is pulled up and driven while the weld metal pond is formed below the lower end to fill the space with the weld metal.

  As the box column becomes larger, the welding space between the skin plate and the diaphragm becomes larger. In order to avoid uneven welding in this space, the nozzle is oscillated (oscillated) in the longitudinal direction x of the skin plate. The three-dimensional welding temperature distribution in the three-dimensional welding target space differs depending on not only the welding power but also the thickness of the skin plate, diaphragm, and metal that defines the space. In addition, in the linear reciprocating drive (oscillate) of the nozzle in the longitudinal direction x of the skin plate, the corner where the gold is applied to the skin plate is far from the nozzle trajectory, so it tends to become low temperature, so high heat input is necessary. The surface of the skin plate that comes off the corner must avoid excessive heat input so as to avoid weakening of the skin plate due to high heat.

  Therefore, in the electroslag welding apparatus described in Patent Document 1, a tip joint is inserted between the lower end insert tip and the upper nozzle tube of the nozzle, thereby inserting the insert tip with respect to the central axis (vertical axis) of the nozzle tube. The nozzle is driven along the thickness direction x of the diaphragm in the welding space between the skin plate and the diaphragm, and the tip of the wire is placed vertically before and after the corner (four corners) of the welding space. Drive around the axis and turn to the back of the corner. According to this, desired heat input with respect to each horizontal two-dimensional part of the welding target space is easy, and highly efficient welding can be performed.

JP2011-218421A.

  However, as shown in FIG. 9, for example, the tip joint 45p guides the welding wire obliquely (tip angle θc) with respect to the central axis (vertical axis) 50pc of the nozzle cylinder, but the inner surface of the welding target material that divides the welding space In order to prevent interference (contact, collision) with the (groove wall surface), the tip of the tip 48p must be defined within a virtual vertical extension region in the inner region of the outer surface of the insulating tube 59p of the nozzle tube 50p. Therefore, since the turning trajectory of the tip (and the wire) around the central axis of the nozzle cylinder 50p must not exceed the outer diameter of the nozzle cylinder, the tip angle θc cannot be increased. In addition, the welding wire is bent at one place in the chip joint, and a large force is locally applied to the bent place, so that plastic bending occurs in the wire. And the wire which received plastic bending produced the big frictional resistance at the time of subsequent passage of a through-hole, and caused the increase in wire feeding resistance. When the wire feed resistance increases, the wire speed tends to fluctuate, and when the wire speed becomes unstable, stable wire feed control becomes difficult.

  The first object of the present invention is to make it possible to design a large angle (θc) at which the welding wire is obliquely bent with respect to the central axis of the nozzle cylinder of electroslag welding by the tip joint. A second object is to suppress an increase in wire feed resistance.

(1) Electroslag having a nozzle cylinder (50), a tip joint (45) attached to the nozzle cylinder, and an insert tip (48) attached to the tip joint, and guiding the welding wire to the molten metal pond of electroslag welding A welding nozzle,
A wire through hole (46) of the tip joint (45) is continuous with the wire through hole of the nozzle cylinder, but is inclined with respect to the central axis of the nozzle cylinder and inclined in the opposite direction. An electroslag welding nozzle (M), characterized by being continuous with a wire through hole inclined with respect to the central axis of the nozzle cylinder.

  For ease of understanding, reference numerals of corresponding elements in the examples shown in the drawings and described later are added in parentheses for reference. The same applies to the following.

  When the wire passes through the tip joint (45), bend it once in the upper half of the wire through hole (46) (the first step) and then in the opposite direction in the lower half ( Second stage bending). The wire is decentered from the central axis of the nozzle cylinder (50) by the first-stage bending by the continuous path (S-shaped path) having the first-stage bending and the second-stage bending in the opposite direction. Since the wire inclination (θc) with respect to the central axis is started by bending the second stage at the position, the wire inclination angle (θc) with respect to the central axis of the nozzle cylinder (50) is designed to be large within the nozzle cylinder outer diameter range it can. That is, since the interference prevention range of the tip of the tip with respect to the groove wall surface becomes wide as “the radius of the nozzle cylinder (50) + the eccentric position”, a large wire inclination angle (θc) can be applied. Furthermore, by making the first-stage bending and the second-stage bending gently or using a path with a large radius of curvature, a stress-distribution-type bending method is achieved, and the wire is moved in a predetermined direction and angle within the range of elastic bending. Can be tilted. Since the wire whose direction has been changed by elastic deformation is linearly fed even in the subsequent through hole, the frictional resistance is extremely small and the feeding resistance is suppressed.

It is a side view which shows the lower half of the welding mechanism of the electroslag welding apparatus of 1st Example of this invention. It is a side view which shows the upper half of the welding mechanism shown in FIG. The entire welding mechanism appears by superimposing the IIB-IIB line of FIG. 2 on the IIB-IIB line of FIG. 2 is an enlarged view of the electroslag welding nozzle M shown in FIG. 2, wherein (a) and (b) are a vertical sectional view (vertical sectional view) perpendicular to the paper surface of FIG. ), (C) is a longitudinal sectional view below the IB-IB line on (a), (d) is a transverse sectional view (horizontal sectional view) of position D on (a), and (e) is on (a). (F) is a cross-sectional view of position F on (c). It is a top view of the welding object space welded with the electroslag welding apparatus shown in FIG. 1, FIG. 2, and also shows the oscillation movement and turning of a nozzle. 6 is a time chart showing the oscillation of the electroslag welding nozzle M and the control of nozzle rotation. FIG. 3 is an enlarged right side view of the nozzle turning mechanism K shown in FIG. (A) is a lower longitudinal section of electroslag welding nozzle M of the 2nd example of the present invention, and (b) is a longitudinal section showing only tip joint 45 shown in (a). (A) is a lower longitudinal section of electroslag welding nozzle M of the 3rd example of the present invention, and (b) is a longitudinal section showing only tip joint 45 shown in (a). (A) is a lower longitudinal cross-sectional view of the electroslag welding nozzle M of 4th Example of this invention, (b) is a longitudinal cross-sectional view which shows only the chip joint 45 shown to (a). It is a longitudinal cross-sectional view of the nozzle cylinder 50p of the conventional electroslag welding nozzle.

  (2) The wire inclination (θc) with respect to the central axis is determined by the second-stage bending at a position eccentric from the central axis of the nozzle cylinder (50) by the first-stage bending; the electro according to (1) above Slag welding nozzle.

  (3) The electroslag welding nozzle as described in (2) above, wherein the first-stage bending and the second-stage bending are made gentle or paths having a large curvature radius.

  (4) Further, any one of the above (1) to (3), further comprising a spring liner (55) continuously disposed in the wire through holes of the nozzle cylinder (50) and the tip joint (45). The electroslag welding nozzle described in 1.

  (5) A longitudinal groove-shaped refrigerant forward path (52), a refrigerant return path (53) extending in parallel with the wire through hole on the outer peripheral surface of the central axis, and the refrigerant forward path (52) and the refrigerant at the lower end An inner cylinder (51) having a ring-shaped channel (54) communicating with the return path (53); covering the outer periphery of the inner cylinder (51), the longitudinal groove-shaped refrigerant forward path (52), the refrigerant return path (53) The nozzle cylinder (50) is configured by the outer cylinder (56) that closes the outward opening of the ring-shaped channel (54); and the insulating tube that covers the outer periphery of the outer cylinder (56). The electroslag welding nozzle described in).

  (6) The inner cylinder (51) and the outer cylinder (56) are conductors; at the upper end of the outer cylinder (56) that is not covered with the insulating sleeve (59), the refrigerant forward path (52) There is a forward refrigerant window (57) communicating with the refrigerant, and a reverse refrigerant window (58) communicating with the refrigerant return path (53); the upper end portion of the outer cylinder (56) is a support block (60) and the outer cylinder A refrigerant supply ring in which the forward refrigerant window (57) communicates with an inner peripheral surface of the support block (60) that is rotatably held around the central axis of the (56) and that is in sliding contact with the inner cylinder (56). There is a refrigerant discharge circuit (63) in which the passage (61) and the return refrigerant window (58) communicate; the support block (60) supplies the refrigerant to the refrigerant supply circuit (61). The electroslag welding nozzle according to (5) above, equipped with a base (65) and a refrigerant discharge base (66) for discharging the refrigerant from the refrigerant discharge circuit (63).

(7) Nozzle lifting mechanism (F) equipped on the vertical strut (E) to drive the oscillator (H) upward during welding;
The electroslag welding nozzle (M) of (1) supported by the swing arm (12) of the oscillator (H); and
A nozzle turning mechanism (L) for rotationally driving the electroslag welding nozzle (M) about the central axis (z) of the nozzle cylinder (50);
An electroslag welding apparatus comprising:

  According to this, the nozzle (M) is moved around the central axis of the nozzle cylinder (50) by the nozzle turning mechanism (L) at the time of welding in which the oscillator (H) is driven to rise (vertical z displacement) by the nozzle lifting mechanism (F). The tip of the welding wire can be automatically swung in the direction (y) perpendicular to the oscillation direction (x) of the nozzle (M) by the oscillator (H) by automatic rotation. It is possible to draw a two-dimensional trajectory (FIG. 4) that is displaced not only in (x) but also in the horizontal orthogonal direction (y). By appropriately setting or adjusting the two-dimensional trajectory, the tip of the welding wire opposes the corner where the backing metal meets the skin plate, increasing the heat input to the corner and oscillating out of the corner area (x) In the region, it is possible to suppress the welding heat input to the skin plate and increase the welding heat input to the diaphragm.

  (8) The nozzle support base frame (25) of the nozzle turning mechanism (L) is supported by the swing arm (12) via the nozzle angle adjustment mechanism (J) around the x axis; The electroslag welding apparatus as described. According to this, the angle with respect to the vertical axis (z) around the x axis of the nozzle (M) is finely adjusted by the nozzle angle adjusting mechanism (J) around the x axis so that the angle is accurately zero. Can do. That is, it is possible to easily eliminate a subtle angular deviation with respect to the vertical line around the x axis of the nozzle (M).

  (9) The nozzle support base frame (25) is supported by the swing arm (12) via a nozzle angle adjustment mechanism (K) around the y axis; the electroslag welding apparatus according to (8) above. According to this, the nozzle angle adjusting mechanism (K) around the y-axis finely adjusts the angle around the y-axis of the nozzle (M) with respect to the vertical axis (z), so that the angle is accurately zero. Can do. That is, it is possible to easily eliminate a subtle angular deviation with respect to the vertical line around the y axis of the nozzle (M). By providing the nozzle angle adjusting mechanism (J) around the x axis and the nozzle angle adjusting mechanism (K) around the y axis, the nozzle (M) can be easily set vertically.

(10) A clamper (A) for mounting and fixing the post (E) to a fixing member;
A mechanism (B, C) that is supported by the clamper (A) and adjusts the y, x position of the column (E) with respect to the clamper; and
(7) to (9) further comprising a horizontal rotation mechanism (D) supported by the y, x position adjustment mechanism (B, C) and supporting the support column (E) so as to be pivotable about a vertical axis. The electroslag welding apparatus as described.

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

  FIG. 1 shows the lower half of the welding mechanism of the electroslag welding apparatus of the first embodiment of the present invention, and FIG. 2 shows the upper half. The entire welding mechanism appears by superimposing the IIB-IIB line in FIG. 2 on the IIB-IIB line in FIG.

  Referring to FIG. 1, a y-position adjusting table B is provided via a manual y-direction position adjusting mechanism in a vise type clamp table A for fixing a column E to a structural material or a welding work table at a welding site. It is mounted so as to be movable in the y direction. By turning the knob that protrudes to the right of the y-position adjustment table B in FIG. 1 in the clockwise direction, the y-position adjustment table B (post E) moves in the direction of the arrow y and rotates in the counterclockwise direction in the opposite direction. Moving.

  On the y position adjusting table B, an x position adjusting table C is mounted so as to be movable in the x direction via a manual x direction position adjusting mechanism. By turning the knob that protrudes from the back of the paper of the x position adjusting table C in FIG. 1 in the clockwise direction, the x position adjusting table C (post E) moves in the x arrow direction and in the counterclockwise direction, it moves in the reverse direction. To do.

  A horizontal rotation mechanism D is mounted on the x position adjustment table C. A conical roller bearing is provided inside the flanged guide sleeve of the mechanism D, and a vertical rod is supported by the bearing so as to be rotatable about a vertical axis. The vertical rod is locked so as not to rotate by turning the lock lever mounted on the guide sleeve clockwise, and the vertical rod can be rotated by turning the lock lever counterclockwise. The lower end surface of the vertical support E is fixed to the vertical rod of the horizontal rotation mechanism D and supported by the vertical rod. Thereby, the support | pillar E can turn centering on the long axis (vertical axis). The column E has a nozzle lifting mechanism F.

  The nozzle elevating mechanism F has a screw rod 10 extending vertically in the support column E, and a nut screwed to the screw rod 10 is fixed to the elevating table G. The screw rod 10 is rotationally driven by an elevating motor 11, and the elevating platform G rises in the vertical direction z by forward rotation of the motor 11 and descends by reverse rotation. In FIG. 1, the lifting platform G is shown at a position where it is lowered to the lower end of the column E, while FIG.

  Referring to FIG. 2, the lifting platform G is equipped with an oscillator H and a cable bear (registered trademark) I. Oscillator H is an oscillating arm with an oscillating motor 14 between one end and the other end of the x-direction oscillating width set by oscillating width adjusting knobs 13a and 13b (13b not shown; located on the back side of 13a). 12 is oscillated in the x direction (reciprocating drive). The swing width adjusting knobs 13a and 13b are fixed to one end and the other end of one screw rod parallel to the x direction. From the middle point to the knob 13a and to the knob 13b, one thread is a right-hand thread and the other is a left-hand thread. When one of the swinging width adjustment knobs 13a and 13b is turned clockwise, the pair of switch bases are separated from each other. This widens the oscillation width of the nozzle M, that is, the x-direction oscillation width. When one of the swinging width adjustment knobs 13a and 13b is turned counterclockwise, the pair of switch bases approach each other. In this case, the x-direction oscillation width is narrowed. As will be described later, when the swing arm 12 driven by the oscillating motor 14 operates one of the limit switches from open to closed (or vice versa), the swing drive of the swing arm 12 is temporarily stopped and the oscillation is performed. The rotation direction of the motor 14 is switched in the reverse direction, and the swing arm 12 is driven to swing in the reverse direction. An x angle adjusting plate 16 is connected to the swing arm 12 via a nozzle angle adjusting mechanism J around the x axis so as to be rotatable around a pin parallel to the x direction.

  By turning the knob 18 of the nozzle angle adjusting mechanism J around the x axis, the inclination angle of the nozzle M around the x axis with respect to the vertical line can be manually adjusted (set). The y angle adjusting plate 20 is connected to the x angle adjusting plate 16 through a nozzle angle adjusting mechanism K around the y axis so as to be rotatable about a y parallel shaft 19 standing on the x angle adjusting plate 16. Yes. By turning the knob of the nozzle angle adjusting mechanism K around the y axis, the inclination angle of the nozzle M around the y axis with respect to the vertical axis can be manually adjusted (set). A base frame 25 of the nozzle turning mechanism L is fixed to the y angle adjusting plate 20.

  The base frame 25 of the nozzle turning mechanism L includes a bevel gear whose axis is parallel to the z-axis and a bevel gear whose meshing axis is parallel to the x-axis, and is rotatably supported by the base frame 25. Yes. The nozzle M passes through the insulating sleeve of the nozzle turning mechanism L and is fixed to the insulating sleeve. The insulating sleeve is supported by the base frame 25 so as to be rotatable (nozzle rotation) about an axis parallel to the z-axis. When the turning motor of the nozzle turning mechanism L rotates in the forward direction, the nozzle M rotates in the forward direction (clockwise rotation in a direction overlooking the space to be welded: FIG. 4). )

  A leg 40 is erected on the y angle adjustment plate 20, and a vertical rod 41 is fixedly supported by the leg 40, and a connecting tool 42 is mounted on the vertical rod 41 so as to be slidable up and down. The cylinder support block 60 (FIG. 3) is connected to the arm 39 fixed to the connector 42 via the nozzle holder 67 (FIG. 3).

  Referring to FIG. 3, in the nozzle M, the tip joint 45 is fixed to the nozzle cylinder 50 by brazing, the insert chip 48 is fixed to the tip joint 45 by screwing, and the inner cylinder 51 which is a copper pipe of the nozzle cylinder 50 is attached. It is supported by the arm 39 (FIG. 2) via a nozzle holder 67 which is held rotatably around the central axis by the tube support block 60 and fixed to the tube support block 60.

  The nozzle cylinder 50 includes an inner cylinder 51 that is a copper pipe, an outer cylinder 56 that is a stainless steel pipe that covers the outer periphery thereof, and an insulating tube 59 that is a heat-shrinkable resin that covers the outer cylinder 56. A spring liner 55 is inserted into the inner cylinder 51 and extends to the upper end (male thread 47) of the insert tip 48.

  The inner cylinder 51 has a through hole in the central axis and a longitudinal groove-shaped refrigerant forward path 52 and a refrigerant return path 53 extending in parallel with the wire through hole on the outer peripheral surface, and a refrigerant forward path 52 and a refrigerant return path 53 at the lower end. There is a ring-shaped flow path 54 that performs. As shown in FIGS. 3D and 3E, the refrigerant forward path 52 and the refrigerant return path 53 are obtained by cutting the outer peripheral surface of the inner cylinder 51 flatly. As shown in f), the position corresponding to the lower ends of the refrigerant forward path 52 and the refrigerant return path 53 of the inner cylinder 51 is cut into a ring groove shape so that the refrigerant forward path 52 and the refrigerant return path 53 are in communication. The inner cylinder 51 is press-fitted into the outer cylinder 56, and the upper and lower ends of the outer cylinder 56 are air-tightly welded to the inner cylinder 51 over the entire circumference. At the upper end portion of the outer cylinder 56 that is not covered with the insulating sleeve 59, there are an outward refrigerant window 57 that communicates with the refrigerant forward path 52 of the inner cylinder 51 and a backward refrigerant window 58 that communicates with the refrigerant return path 53.

  The upper end portion of the outer cylinder 56 is rotatably held around the central axis of the outer cylinder 56 by the support block 60, and the outward refrigerant of the outer cylinder 56 is disposed on the inner peripheral surface of the support block 60 where the inner cylinder 56 is in sliding contact. There is a refrigerant supply circuit 61 that communicates with the window 57 and a refrigerant discharge circuit 63 that communicates with the return refrigerant window 58. A refrigerant supply base 65 for supplying the refrigerant to the refrigerant supply circuit 61 and a refrigerant discharge base 66 for discharging the refrigerant from the refrigerant discharge circuit 63 are mounted on the support block 60. A welding voltage is applied to the base 65 and the base 66 during electroslag welding, and the welding voltage moves downward through the inside of the spring liner 55 via the outer cylinder 56, the inner cylinder 51 and the spring liner 55. Join the wire.

  The coolant, which is the cooling water, is supplied to the base 65 and enters the coolant forward path 52 via the coolant supply circuit 61 and the coolant through window 57 and descends downward, and enters the coolant return path 53 via the lower ring-shaped channel 54. The refrigerant returns to the base 66 through the refrigerant through window 58 and the refrigerant discharge circuit 63. Due to this refrigerant flow, the cooling capacity of the nozzle M is high.

  A tip joint 45 to which an insert tip 48 is attached is attached to the lower end of the inner cylinder 51 by brazing ((c) in FIG. 3). The wire through hole 46 of the tip joint 45 is continuous with the wire through hole of the nozzle cylinder 50, but is gently inclined with respect to the wire through hole of the nozzle cylinder 50 (first-stage bend) and inclined in the opposite direction (first step). 2 steps of bending) and continue to the wire through hole of the insert tip 48. Since the second-stage bend is opposite to the first-stage bend, the inner cylinder 51 / chip is formed by the first-stage bend according to the lever principle before and after the joint between the nozzle cylinder 50 and the tip joint 45. The force with which the wire is pressed against the inner surface (spring liner 55) of the wire through hole before and after the connection portion between the joints is weakened. As a result, the wire feeding resistance is reduced.

  The wire through hole of the insert tip 48 is located at the center axis of the tip 48. Since the center axis must be inclined with respect to the center axis of the inner cylinder 51, the second stage bend is the first stage bend. Therefore, the second stage bend is steeper (stronger bend) than the first stage bend. Since the second-stage bending is strong, the force to pull away the wire pressed against the inner surface (spring liner 55) of the wire through hole before and after the connection portion between the inner cylinder 51 and the chip joint by the first-stage bending is strong, and the wire feeding Resistance is greatly suppressed.

  The tip joint 45 includes a first quadrangular copper block in which a half of the wire through hole 46 is formed on one surface, and a second quadrangular copper block in which a half of the half and the symmetrical shape are formed on one surface. Are attached to the integrated block by brazing, the female screw hole 47 is formed by screw machining, and the outer shape is machined into a cylindrical shape by cutting outside the integral block.

  By automatically turning the nozzle cylinder 50 of the nozzle M using the nozzle turning mechanism L during welding, high-quality electroslag welding can be efficiently performed. For example, as shown in FIG. 4, the reference posture of the insert tip 48 is a posture in which the wire is directed in the direction of the arrow ArC, the welding target space surrounded by the skin plate, the diaphragm, and the backing metal is set to a specified turning angle of 270 degrees, When welding by torch oscillation and torch swivel (rotation around the central axis of the nozzle cylinder 50) shown in FIG. 5, by repeating forward and reverse swiveling around the central axis of the nozzle cylinder 50 during the torch oscillation. The movement trajectory of the tip of the welding wire fed out from the insert tip 48 has a generally semi-elliptical shape shown by a two-dot chain line in FIG. In this case, in the corner where the backing metal crosses the skin plate, the position of the tip of the welding wire faces 45 ° with respect to the skin plate and the backing metal in the direction indicated by the arrows ArL and ArR facing the corner. Therefore, there is much welding heat input to the corner. In the x region outside the corner region, the wire tip is far from the skin plate and close to the diaphragm, so that welding heat input to the skin plate is suppressed and welding heat input to the diaphragm is promoted. This enhances the joint performance of the corner portion, suppresses weakening of the skin plate due to welding heat, and increases the joint strength of the diaphragm.

  Note that it is difficult to adjust the inclination posture of the column E by the clamper A and the tilt setting of the column E by the x and y position adjustment bases C and B and the manual adjustment of the x and y position, but in this embodiment, the oscillator arm of the oscillator H 12 is equipped with nozzle angle adjustment mechanisms J and K around the x and y axes, so that the angle of the nozzle M around the x and y axes can be finely adjusted. Can be set or adjusted easily and accurately.

  FIG. 6 shows a second embodiment of the electroslag welding nozzle M of the present invention. This increases the length of the tip joint 45 in the direction in which the central axis extends, whereby the first step bend of the wire passage hole 46 of the tip joint 45 with respect to the wire passage hole of the nozzle cylinder 50 and the insert tip 48. The second-stage bending with respect to the central axis of the second is made gentle. The wire feeding resistance of the bent portions of the first stage and the second stage is low by the amount that is loosened. Other structures and functions are the same as those of the electroslag welding nozzle M of the first embodiment (FIG. 3).

  FIG. 7 shows a third embodiment of the electroslag welding nozzle M of the present invention. This is because, in the electroslag welding nozzle of the second embodiment shown in FIG. 6, a female screw hole is formed at the lower end of the inner cylinder 51, a male screw is formed at the upper end of the tip joint 45, and the chip joint 45 is connected by screw connection. It is fixed to the cylinder 51. Thereby, when the tip joint 45 or the nozzle cylinder 50 is damaged or deteriorated, it can be replaced with a new one. It is also easy to replace the tip joint 45 with one having a different inclination. Other structures and functions are the same as those of the electroslag welding nozzle of the second embodiment (FIG. 6). In the electroslag welding nozzle of FIGS. 3 and 6, the tip joint 45 is brazed to the nozzle cylinder 50, so that the tip joint 45 or the nozzle cylinder 50 is regarded as a new article by separating the tip joint 45 from the nozzle cylinder 50. It takes time to exchange.

  FIG. 8 shows a fourth embodiment of the electroslag welding nozzle M of the present invention. This is because the first step bending of the wire through hole 46 of the tip joint 45 of the electroslag welding nozzle of the third embodiment shown in FIG. 7 continuing to the wire through hole of the inner cylinder 51 has a gentle curvature with a large radius. An arc shape is used, and the next second-stage bending is an arc-shaped sharp curve with a small radius. Since the bending of the wire through hole 46 is circular and smooth, the wire feeding resistance is further reduced. Other structures and functions are the same as those of the electroslag welding nozzle of the third embodiment (FIG. 7).

A: Clamp base B: y position adjustment base C: x position adjustment base D: Horizontal rotation mechanism E: Post F: Nozzle lift mechanism G: Lift base H: Oscillator I: Cable bear (registered trademark)
J: Nozzle angle adjustment mechanism around the x axis K: Nozzle angle adjustment mechanism around the y axis L: Nozzle turning mechanism M: Nozzle 10: Screw rod 11: Lifting motor 12: Swing arm 13a: Swing width adjustment knob 14: Oscillating motor 16: x angle adjusting plate 18: x angle adjusting knob 19: y parallel axis 20: y angle adjusting plate 25: base frame 39 of nozzle rotation: arm 40: leg 41: vertical rod 42: coupling tool 43: lock lever 45: Tip joint 46: Wire through hole 47: Female screw hole 48: Insert tip 50: Nozzle cylinder 51: Inner cylinder (copper pipe)
52: Refrigerant forward path 53: Refrigerant return path 54: Ring-shaped flow path 55: Spring liner 56: Outer cylinder (stainless steel pipe)
57: Outgoing refrigerant window 58: Returning refrigerant window 59: Insulating tube 60: Cylinder support block 61: Refrigerant supply circuit 62: Refrigerant supply port 63: Refrigerant discharge circuit 64: Refrigerant discharge port 65: Refrigerant supply port 66: Refrigerant discharge base 67: Nozzle holder

Claims (10)

An electroslag welding nozzle having a nozzle cylinder, a tip joint attached to the nozzle cylinder and an insert tip attached to the tip joint, for guiding a welding wire to a molten metal pond of electroslag welding,
The wire hole of the tip joint is continuous with the wire hole of the nozzle tube, but is inclined with respect to the central axis of the nozzle tube and is inclined in the opposite direction with respect to the central axis of the nozzle tube of the insert chip. An electroslag welding nozzle characterized by being continuous with an inclined wire through hole.   2. The electroslag welding nozzle according to claim 1, wherein the wire inclination with respect to the central axis is determined by the second-stage bending at a position eccentric from the central axis of the nozzle cylinder by the first-stage bending.   The electroslag welding nozzle according to claim 2, wherein the first-stage bend and the second-stage bend are made gentle or have a path with a large radius of curvature.   The electroslag welding nozzle according to any one of claims 1 to 3, further comprising a spring liner disposed continuously in the nozzle tube and the wire through hole of the tip joint.   An inner cylinder having a wire through hole in the central axis and a longitudinal groove-shaped refrigerant forward path and refrigerant return path extending in parallel with the wire through hole on the outer peripheral surface and a ring-shaped flow path communicating with the refrigerant forward path and the refrigerant return path at the lower end portion An outer cylinder that covers the outer periphery of the inner cylinder and closes the outward opening of the longitudinal groove-shaped refrigerant forward path, the refrigerant return path, and the ring-shaped flow path; and an insulating tube that covers the outer periphery of the outer cylinder; The electroslag welding nozzle according to claim 1, wherein:   The inner cylinder and the outer cylinder are electrical conductors; an outer refrigerant window that communicates with the refrigerant forward path and a backward refrigerant window that communicates with the refrigerant return path at an upper end portion of the outer cylinder that is not covered with the insulating sleeve. Yes; the upper end portion of the outer cylinder is rotatably supported by the support block around the central axis of the outer cylinder, and the inner refrigerant surface of the support block is in sliding contact with the outgoing refrigerant window There is a refrigerant supply circuit that communicates with the refrigerant, and a refrigerant discharge circuit that communicates with the return refrigerant window; the support block includes a refrigerant supply port that supplies the refrigerant to the refrigerant supply circuit and a refrigerant from the refrigerant discharge circuit An electroslag welding nozzle according to claim 5, wherein a refrigerant discharge cap for discharging the gas is attached. A nozzle lifting mechanism equipped with a vertical support to drive the oscillator up during welding;
The electroslag welding nozzle of claim 1 supported by a rocking arm of the oscillator; and
A nozzle turning mechanism for rotating the electroslag welding nozzle about the central axis of the nozzle cylinder;
An electroslag welding apparatus comprising:   The electroslag welding apparatus according to claim 7, wherein the nozzle support base frame of the nozzle turning mechanism is supported by the swing arm via a nozzle angle adjustment mechanism around the x axis.   The electroslag welding apparatus according to claim 8, wherein the nozzle support base frame is supported by the swing arm via a nozzle angle adjustment mechanism around a y-axis. A clamper for mounting and fixing the post to a fixing member;
A mechanism which is supported by the clamper and adjusts the y and x positions of the support with respect to the clamper; and
A horizontal rotation mechanism that is supported by the y, x position adjustment mechanism and that supports the support column so as to be rotatable about a vertical axis;
The electroslag welding apparatus according to any one of claims 7 to 9, further comprising:

Images