JP2016203187A - Tig welding torch provided with narrowing nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a TIG welding torch provided with a narrowing nozzle which can raise the effect of the narrowing nozzle furthermore.SOLUTION: A TIG welding torch comprises a narrowing gas supply port 2, a shield gas supply port 3, a narrowing nozzle 4 which supports an electrode rod T concentrically, a gas nozzle 5 which is arranged concentrically at the outer periphery of the narrowing nozzle 4, a narrowing gas communication tube 6 which communicates the narrowing gas supply port 2 and the narrowing nozzle 4 internally, and a shield gas communication passage 7 which is provided at the outer periphery of the narrowing gas communication tube 6 and communicates the shield gas supply port 3 and the gas nozzle 5 internally. The narrowing gas communication tube 6 comprises a collet tube part 9 having a collet which holds the electrode rod T and a fastening tube part 10 which is screwed to the collet tube part 9 and gives fastening force to the collet. The collet comprises split grooves for holding through which narrowing gas Gx can pass.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a TIG welding torch including a constricting nozzle.

  Conventionally, as a TIG welding torch having a constriction nozzle, for example, as shown in FIG. 7, a shield nozzle 100, a constriction nozzle 101 provided inside the shield nozzle 100 and into which an electrode rod T is inserted concentrically, and a gas lens 102 A TIG welding torch including a collet chuck 103 that holds the electrode rod T, a clamping member 104 of the collet chuck 103, and a shield gas supply port 105 is known (Patent Document 1, Non-Patent Documents 1 and 2). etc).

  In this conventional TIG welding torch, the shield gas G supplied from the shield gas supply port 105 passes through the gas lens 102 and flows between the constriction nozzle 101 and the shield nozzle 100, and does not pass through the gas lens 102. And the shield gas G2 flowing inside the constricting nozzle 101, and the shield gas G2 is discharged at a higher speed than the shield gas G1.

  A TIG welding torch equipped with such a constricting nozzle (1) promotes the tightness of the arc plasma, thereby increasing the temperature of the center of the arc plasma, and (2) the flow rate of the plasma air flow by increasing the gas flow rate. (3) There is an effect of concentrating the current path at the center of the arc plasma, and the effect is increased in a region where the welding current is large. (4) When a rectangular waveform pulse current is used, The difference in heat flow rate between the base current and the base current is larger than that of a TIG welding torch that does not have a constricting nozzle, and produces the effect of further enhancing the characteristics of pulse welding. (5) A shielding gas is placed around the tungsten electrode rod. Because it flows at high speed, the temperature rise of the tungsten electrode rod is suppressed, and the high-speed rectifying gas released from the tip of the constricting nozzle Since it is possible to prevent the evaporated metal generated from the molten pool from adhering to the tip of the tungsten electrode rod, the life of the tungsten electrode rod can be extended. (6) Arc plasma and heat input to the base metal It changes depending on the change in the rod tip angle, but by reducing the adhesion of evaporated metal etc. to the tip of the electrode rod, the change in the heat input to the arc plasma and the base metal is suppressed, and the stable plasma and the input to the base material are reduced. Excellent effects such as being able to maintain heat are exhibited.

International Publication No. WO2013 / 157036 Pamphlet

Junpei Konishi, Masaya Morita, Manabu Tanaka, Akihisa Murata, Yusuke Murata, “Effects on the Arc Phenomenon of Stenosis Nozzles in TIG Welding”, Welding Society Proceedings Vol. 32, No. 2, June 13, 2014, p. 47-51 Junpei Konishi, Masaya Shioda, Manabu Tanaka, Akihisa Murata, Yusuke Murata, “Effects of Welding Conditions on Stenosis Tig Arc”, The Japan Welding Society Vol. 32, No. 3, November 22, 2014, p. 207-212

  Although the TIG welding torch provided with the above-described constricting nozzle can exhibit excellent performance as described above, further performance improvement is desired.

  Therefore, the main object of the present invention is to provide a TIG welding torch having a constricting nozzle that can improve the performance by improving the conventional TIG welding torch having the constricting nozzle.

  To achieve the above object, a TIG welding torch having a constriction nozzle according to the present invention includes a constriction gas supply port, a shield gas supply port, a constriction nozzle that supports an electrode rod concentrically, and an outer periphery of the constriction nozzle. A gas nozzle arranged concentrically, a stenosis gas communication pipe for internally communicating the stenosis gas supply port and the stenosis nozzle, and an outer peripheral portion of the stenosis gas communication pipe provided with the shield gas supply port and the gas nozzle inside. A confining gas communication pipe, the constriction gas communication pipe includes a collet pipe portion having a collet for gripping an electrode rod, and a tightening member that is screwed to the collet pipe portion to apply a tightening force to the collet. And the collet is provided with a gripping groove for allowing the constriction gas to flow therethrough.

  A torch cooling pipe extrapolated to the constricting gas communication pipe, a cooling water flow passage provided around the torch cooling pipe, and a cooling water supply port and a cooling water discharge port communicating with the cooling water flow passage. Preferably, a gap for forming the shield gas communication portion is provided between the constriction gas communication tube and the torch cooling tube.

  The tightening tube portion is connected to the constricting nozzle on one end side, and a female screw portion is formed on the inner peripheral surface of the end portion on the other end side, and the collet tube portion is formed with the collet on the end portion, A male screw portion that is screwed into the female screw portion is formed on an outer peripheral surface, an end surface of the collet tube portion on which the collet is formed is a first tapered surface, and an inner peripheral surface of the tightening tube portion is provided with the first Preferably, there is provided a step portion formed with a second tapered surface that engages with the first tapered surface and applies a clamping force to the collet.

  It is preferable that a gap through which the constriction gas passes is formed between the stepped portion and the electrode rod.

  According to the TIG welding torch having the stenosis nozzle according to the present invention, the stenosis gas discharged from the stenosis nozzle and the shield gas discharged from the gas nozzle are supplied through separate paths. In addition, the flow rate of the constriction gas and the shield gas can be individually controlled, and the performance of the melt constriction nozzle can be further increased.

It is a vertical front view which shows one Embodiment of a TIG welding torch provided with the constriction nozzle which concerns on this invention. It is a disassembled perspective view of the TIG welding torch of FIG. It is a perspective view which expands and shows one component of FIG. It is the A section expanded sectional view of FIG. It is VV sectional drawing of FIG. It is the B section expanded sectional view of Drawing 4. It is a vertical front view which shows a TIG welding torch provided with the conventional constriction nozzle.

  An embodiment of a TIG welding torch including a constricting nozzle according to the present invention will be described below with reference to FIGS. In addition, the same code | symbol was attached | subjected to the same component through all the figures.

  As shown in FIGS. 1 and 2, a TIG welding torch 1 according to the present invention includes a constriction gas supply port 2, a shield gas supply port 3, a constriction nozzle 4 that concentrically supports the electrode rod T, and a constriction nozzle. 4, a gas nozzle 5 disposed concentrically on the outer periphery, a constriction gas communication pipe 6 that allows the constriction gas supply port 2 and the constriction nozzle 4 to communicate with each other, and a shield gas supply port 3 provided on the outer periphery of the constriction gas communication pipe 6. And a shield gas communication passage 7 that allows the gas nozzle 5 to communicate with each other.

  The constriction gas communication tube 6 includes a collet tube portion 9 (FIGS. 1 to 3) having a collet 8 (FIGS. 3 and 6) that holds the electrode rod T, and is screwed to the collet tube portion 9 to be fastened to the collet 8. And a tightening tube portion 10 (FIGS. 1, 2, and 4) for applying a force. In the illustrated example, the tightening tube portion 10 is screwed to the constriction nozzle 4, but the constriction nozzle 4 and the tightening tube portion 10 may be integrally formed. In order to support the electrode rod T concentrically, the constriction nozzle 4 includes a plurality of support protrusions 4a (FIGS. 4 and 5) protruding in the radial direction from the inner peripheral surface, and adjacent support protrusions 4a and 4a. The constriction gas passes through the gap 4b (FIG. 5).

  In the illustrated example, the constriction gas communication pipe 6 includes a clamping pipe part 10, a collet pipe part 9, and an extension pipe part 11 screwed to the collet pipe part 9. The collet tube portion 9 and the extension tube portion 11 may be integrally formed. A knob 12 is attached to the rear end portion of the extension tube portion 11, and the knob 12 is fixed to the extension tube portion 11 by a fixing screw (not shown) screwed into the screw hole 13. One end of the passage 6 is closed.

  A gap 14 (FIG. 1) through which the constriction gas Gx can flow is formed between the inner peripheral surface of the extension tube portion 11 and the electrode rod T. A through hole 15 is formed in the extension pipe portion 11, and the constriction gas Gx supplied from the constriction gas supply port 2 is supplied into the constriction gas communication pipe 6 through the through hole 15.

  The collet 8 includes a holding split groove 16 (FIGS. 3 and 6) through which the constriction gas Gx can flow. The holding split groove 16 constituting the collet 8 is formed at one end of the collet tube portion 9. At the end of the collet tube portion 9 where the collet 8 is formed, a convex portion 8a (FIG. 6) is formed on the inner peripheral surface, and the electrode rod T is held by the convex portion 8a. The convex portion 8a on the inner peripheral surface of the collet tube portion 9 forms a gap 17 (FIG. 6) between the inner peripheral surface where the convex portion 8a of the collet tube portion 9 is not formed and the electrode rod T. The constriction gas Gx can flow through the gap 17.

  The collet tube portion 9 has a male screw portion 18 (FIGS. 3 and 4) formed on the outer peripheral surface. The 1st taper surface 20 (FIG. 3, FIG. 6) is formed in the end surface of the collet pipe | tube part 9 in which the collet 8 was formed.

  The fastening tube portion 10 has a female screw portion 19 formed on the inner peripheral surface of the end opposite to the side connected to the narrowing nozzle 4. Further, a stepped portion 22 having a second tapered surface 21 (FIG. 6) that engages with the first tapered surface 20 and applies a clamping force to the collet 8 is provided on the inner peripheral surface of the tightening tube portion 10. .

  When the male screw portion 18 is screwed into the female screw portion 19, the first tapered surface 20 and the second tapered surface 21 are engaged, and the collet 8 is tightened to hold the electrode rod T. Even when the collet 8 is narrowed by tightening the collet 8, the groove width of the holding split groove 16 is designed such that a gap through which the constricting gas Gx can flow is formed.

  Further, since a gap 23 (FIG. 6) through which the constriction gas Gx passes is formed between the step portion 22 and the electrode rod T, the constriction gas that has passed through the gripping split groove 16 passes through the gap 23 and becomes a constriction nozzle. 4 can be distributed to the inside.

  Further, referring to FIG. 1, the TIG welding torch 1 includes a torch cooling pipe 24 extrapolated to the constricted gas communication pipe 6, a cooling water flow path 25 provided around the torch cooling pipe 24, and a cooling water flow path. 25, a cooling water supply port 26 and a cooling water discharge port 27 communicating with 25 are provided.

  A gap is provided between the constriction gas communication pipe 6 and the torch cooling pipe 24, and the shield gas communication path 7 is formed by the gap. A cooling outer cylinder 28 is attached around the torch cooling pipe 24, a cooling water flow passage 25 is formed in the gap between the torch cooling pipe 24 and the cooling outer cylinder 28, and the gas nozzle 5 is screwed to the cooling outer cylinder 28. . Reference numerals 29 and 30 denote seal rings, and reference numeral 31 denotes an outer cylinder attached to the outside of the cooling outer cylinder 28.

  The shield gas Gs that has passed through the shield gas communication path 7 formed by the gap between the constriction gas communication pipe 6 and the torch cooling pipe 24 passes through the cooling outer cylinder 28 as shown in FIG. The gas is rectified by the gas lens 33 (FIG. 4) attached to the end of the cylinder 28 and discharged from the gas nozzle 5. The gas lens 33 may be a metal mesh in which a plurality of sheets are laminated.

  As shown in FIG. 1, the torch cooling pipe 24 and the cooling outer cylinder 28 are screwed to the flow path block 35. The extension pipe 11, the constriction gas supply port 2, and the shield gas supply port 3 are also screwed to the flow path block 35. A ground terminal 36 (FIGS. 1 and 2) is fixed to the flow path block 35 with a bolt 37.

  In order to replace or adjust the length of the electrode rod T, the knob 12 is turned in the screwing direction to remove the constricted gas communication pipe 6 from the flow path block 35, and the clamping pipe part 10 is screwed out or screwed out from the collet pipe part 9. The gripping force of the collet 8 may be loosened by turning in the removal direction. In this main TIG welding torch 1, the distance that the electrode rod T protrudes from the constriction nozzle 4 determines the quality of the welding.

  Since the TIG welding torch 1 having the above configuration can supply the constriction gas Gx and the shielding gas Gs separately, it can also supply different types of gases and individually control the flow rates thereof. You can also.

  For example, a mixed gas of an inert gas and an active gas can be supplied as the constriction gas, and an inert gas can be supplied as the shield gas. It is known that the thermal pinch effect (the effect of contracting the arc) is enhanced by using a mixed gas in which an active gas is mixed with an inert gas as a shielding gas. By using the mixed gas as a constricting gas, mixing is performed. A synergistic effect of the thermal pinch effect by the gas and the pinch effect by the narrowing nozzle 4 can be exhibited.

  Further, the constriction gas and the shield gas can be the same type of inert gas, and the arc can be optimized by adjusting the flow rate of the constriction gas and the flow rate of the shield gas.

1 TIG welding torch 2 Narrowing gas supply port 3 Shielding gas supply port 4 Narrowing nozzle 5 Gas nozzle 6 Narrowing gas communication pipe 7 Shielding gas communication path 8 Collet 9 Collet pipe part 10 Clamping pipe part 24 Torch cooling pipe 25 Cooling water flow path 26 Cooling water Supply port 27 Cooling water discharge port

According to the TIG welding torch having the stenosis nozzle according to the present invention, the stenosis gas discharged from the stenosis nozzle and the shield gas discharged from the gas nozzle are supplied through separate paths. allowed or, individually constriction gas and shielding gas can flow control, it is possible to further raise the performance of the narrow窄nozzle.

A TIG welding torch having a constriction nozzle according to an embodiment of the present invention includes a constriction nozzle that concentrically supports an electrode rod, and a constriction gas supply port for supplying a constriction gas that is discharged from the constriction nozzle. And a shield gas supply port, a gas nozzle concentrically disposed on the outer periphery of the constriction nozzle, a constriction gas communication pipe that internally communicates the constriction gas supply port and the constriction nozzle, and an outer peripheral portion of the constriction gas communication pipe A shield gas communication passage that is provided to communicate the shield gas supply port and the gas nozzle internally, and the constriction gas communication tube is a collet tube portion having a collet that holds an electrode rod, and the constriction gas A collet tube portion configured to flow inside, and a tightening tube portion that is screwed to the collet tube portion to apply a tightening force to the collet. Tsu DOO is characterized in that the constriction gas is provided with a gripping split groove can flow.

In one embodiment, the TIG welding torch includes a torch cooling pipe extrapolated to the constricted gas communication pipe, a cooling water flow passage provided around the torch cooling pipe, and a cooling flow communicating with the cooling water flow passage. further comprising a water inlet and a cooling water discharge port, and between the torch cooling tube and said constricting gas communication pipe, the gap forming the shielding gas communication passage is provided. In one embodiment, the fastening tube portion is connected to the constricting nozzle on one end side, a female screw portion is formed on the inner peripheral surface of the end portion on the other end side, and the collet tube portion is formed on the end portion. The collet is formed, a male screw part that is screwed into the female screw part is formed on an outer peripheral surface, an end surface of the collet pipe part on which the collet is formed is a first tapered surface, and the fastening pipe part Is provided with a stepped portion formed with a second tapered surface that engages with the first tapered surface and applies a clamping force to the collet. In one embodiment, a gap through which the constriction gas passes is formed between the stepped portion and the electrode rod. Further, in an embodiment, a plurality of support convex portions that support the electrode rods are provided on the inner peripheral surface of the constricting nozzle with a gap between the collet tube portion and the constricting nozzle, The narrowing gas flow path is formed in contact with the electrode rod so as to pass through a gap between the collet holding slit and the support convex portion of the narrowing nozzle.

Claims (4)

A constriction gas supply port;
A shield gas supply port;
A constricted nozzle that supports the electrode rod concentrically;
A gas nozzle arranged concentrically on the outer periphery of the constriction nozzle;
A stenosis gas communication pipe for internally communicating the stenosis gas supply port and the stenosis nozzle;
A shield gas communication path provided in an outer peripheral portion of the constriction gas communication pipe and internally connecting the shield gas supply port and the gas nozzle;
The constricted gas communication tube has a collet tube portion having a collet that holds an electrode rod, and a clamping tube portion that is screwed to the collet tube portion to apply a clamping force to the collet,
The TIG welding torch having a stenosis nozzle, wherein the collet has a gripping groove for allowing a stenosis gas to flow therethrough. A torch cooling pipe extrapolated to the constricting gas communication pipe, a cooling water flow passage provided around the torch cooling pipe, and a cooling water supply port and a cooling water discharge port communicating with the cooling water flow passage. Have
2. The TIG welding torch having a stenosis nozzle according to claim 1, wherein a gap for forming the shield gas communication part is provided between the stenosis gas communication pipe and the torch cooling pipe. The fastening tube portion is connected to the narrowing nozzle on one end side, and a female screw portion is formed on the inner peripheral surface of the end portion on the other end side,
The collet tube portion is formed with the collet at an end portion and a male screw portion screwed into the female screw portion on an outer peripheral surface,
An end surface of the collet tube portion on which the collet is formed is a first tapered surface,
2. A step portion formed with a second tapered surface that engages with the first tapered surface and applies a clamping force to the collet is provided on an inner peripheral surface of the clamping pipe portion. Or a TIG welding torch provided with the constriction nozzle of 2. 4. A TIG welding torch having a stenosis nozzle according to claim 3, wherein a gap through which a stenosis gas passes is formed between the stepped portion and the electrode rod.

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