JP5817249B2 - Welding torch - Google Patents

Description

  The present invention relates to a welding torch used for gas shielded arc welding or the like.

  Gas shield welding is known in which the arc and molten pool are shielded from air in order to prevent blowholes from being generated in the weld metal due to a chemical reaction between the arc and molten pool and air during welding. ing.

  For example, in Patent Document 1, a shield gas is supplied to an orifice via a torch body and a chip holder, and discharged from a gas hole of the orifice, thereby rectifying the inside of the nozzle. This shields the arc and the molten pool from the air.

JP 2004-243342 A

  However, in the configuration of Patent Document 1, the contact tip, nozzle, orifice, and tip holder are exposed to a high temperature during welding due to the influence of radiant heat accompanying the generation of an arc. When the temperature of the contact tip or the like rises, when spatter generated during welding adheres, the intermolecular movement of the spatter becomes active on the adhesion surface, leading to welding. Since sputter welding can cause fluctuations in arc voltage and poor welding, it is necessary to periodically clean up to remove spatter.

  Further, when the temperature of the contact chip or the like rises, there is a risk of deformation due to heat. In particular, when the contact tip is deformed, there is a possibility that a target position shift of the welding wire that causes a decrease in welding quality may occur. In addition to this, deformation of the contact tip promotes wear inside the contact tip due to contact with the welding wire, and the contact tip replacement cycle may be shortened.

  Accordingly, an object of the present invention is to provide a welding torch capable of suppressing deformation due to heat and welding of spatter during welding.

  The welding torch of the present invention includes a torch body, a tip holder, a contact tip, an insulator surrounding the tip holder, and a nozzle surrounding the tip holder and the contact tip. In addition, an orifice having a discharge hole that forms a surge chamber between the tip holder and the outer peripheral surface including the through hole of the chip holder and communicates the inner peripheral side and the outer peripheral side at the tip side from the portion surrounded by the insulator of the chip holder Is provided. And the heat radiating member formed with the carbon compound which does not contain a metal compound is joined to the outer peripheral surface containing at least the front-end | tip part of a contact chip.

  According to the present invention, since the heat of the contact tip is released through the heat radiating member, the temperature rise of the contact tip during welding can be suppressed and deformation due to heat can be suppressed. Moreover, since the heat radiating member does not contain a metal compound, it is possible to obtain the effect of suppressing spatter welding together with the effect of suppressing the temperature rise.

It is sectional drawing of the torch body which concerns on embodiment of this invention. It is an enlarged view around the orifice of a torch body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a welding torch according to this embodiment. In the following description, the side facing the workpiece of the welding torch is the front end, and the opposite side is the base end.

  The welding torch 100 includes a torch body 6, a tip holder 5, an insulator 4, an orifice 3, a nozzle 2, and a contact tip 1.

  The torch body 6 and the chip holder 5 are formed of a conductive material such as chrome copper, for example, and have an insertion hole 20 for passing a welding wire and a shielding gas therein. The tip holder 5 is attached to the tip of the torch body 6. For example, it mounts | wears by the screw joint by the screw thread provided in the internal peripheral surface of the chip holder 5, and the screw thread provided in the torch body 6. FIG.

  A contact chip 1 formed of a conductive member such as chrome copper is attached to the tip of the chip holder 5 by screw bonding or the like.

  The contact tip 1 has an insertion hole 21 through which a welding wire is passed. A contact chip heat radiating member 9 is mounted on the outer periphery within a predetermined range from the tip of the contact chip 1. For attachment, various joining methods such as screwing, screw joining, and press fitting may be used. However, it is desirable that the outer peripheral surface of the contact chip 1 and the inner peripheral surface of the contact chip heat radiation member 9 are in close contact with each other.

  The contact chip heat radiating member 9 is formed of a compound containing carbon as a main component (hereinafter referred to as a carbon compound). Examples of the contained component include fluorine and silicon. However, no metal compound is contained.

  The purpose of mounting on the contact chip 1 is to absorb heat from the contact chip 1 and to release the absorbed heat to the outside by mounting a member having a relatively high thermal conductivity such as carbon. That is, it is suppressing the temperature rise of the contact tip 1 during welding. In order to achieve this object, it is sufficient to form the contact chip heat radiating member 9 only from carbon. However, in order to ensure performance such as impact resistance, it is formed of a carbon compound.

  A nozzle 2 is mounted on the outer periphery of the chip holder 5 via an insulator 4 and an orifice 3.

  The chip holder 5 includes a plurality of through-holes 5 </ b> A that communicate with the passage through which the internal shielding gas passes and the outside of the chip holder 5 and extend in a direction perpendicular to the axis. Further, a chip holder heat radiating member 7 is attached to an outer peripheral portion within a predetermined range from the tip side of the chip holder 5. The chip holder heat radiating member 7 is formed of a carbon compound in the same manner as the contact chip heat radiating member 9 and can be attached by various joining methods such as screwing. Further, it is desirable that the inner peripheral surface and the outer peripheral surface of the chip holder 5 are in close contact with each other.

  The insulator 4 is a cylindrical member formed of an insulating material and having a hole through which the chip holder 5 passes. The insulator 4 is attached to the outer periphery of the chip holder 5 by screw bonding or the like.

  The orifice 3 is a cylindrical member made of a heat resistant resin such as a fluorine resin. As shown in FIG. 2, the inner peripheral surface has an annular recess 3 </ b> B, and the bottom of the recess 3 </ b> B includes a plurality of discharge holes 3 </ b> A that connect the inner periphery side and the outer periphery side of the orifice 3. FIG. 2 is an enlarged view around the orifice 3 of the torch body. Such an orifice 3 is mounted on the outer periphery of the chip holder 5 and on the tip side from the insulator 4. In the mounted state, the recess 3 </ b> B and the outer peripheral surface of the chip holder 5 define the surge chamber 10. Then, the through hole 5 </ b> A opens into the surge chamber 10.

  The nozzle 2 is attached to the tip portion of the insulator 4 by screw joining or the like. For this reason, the nozzle 2 and the chip holder 5 are in an electrically insulated state. Further, the nozzle 2 surrounds the chip holder 5 and the contact chip 1 while being mounted on the insulator 4. That is, the passage through which the shield gas provided inside the chip holder 5 passes is in communication with the space on the inner peripheral side of the nozzle 2 through the through hole 5A, the surge chamber 10A, and the discharge hole 3A. As a result, the shield gas supplied from the base end side of the torch body 6 flows into the surge chamber 10 through the insertion hole 20 and the through hole 5A, and in a rectified state, from the discharge hole 3A of the orifice 3 to the nozzle 2. It flows into the inner space. In addition to the rectifying effect, the orifice 3 has effects such as preventing spatter generated during welding from entering the chip holder 5 and preventing spatter from adhering to the chip holder 5.

  A nozzle heat radiating member 8 is mounted on the inner circumference within a predetermined range from the tip of the nozzle 2. For attachment, various joining methods such as screwing, screw joining, and press fitting may be used. The nozzle heat radiating member 8 is also formed of a carbon compound, like the contact chip heat radiating member 9.

  In the welding torch 100 having the above configuration, the welding wire supplied from the proximal end side of the torch body 6 by a wire supply device (not shown) protrudes from the distal end of the contact tip 1 through the insertion holes 20 and 21. . Further, a welding current is supplied to the contact tip 1 through the torch body 6 and the tip holder 5. As a result, a welding current is supplied to the welding wire that contacts the contact tip 1.

  On the other hand, the shield gas supplied from the base end side of the torch body 6 is rectified by the orifice 3 and ejected from the nozzle 2 as described above. Thereby, welding can be performed in a state where the arc and the weld pool are shielded from the air by the shielding gas.

  By the way, the contact tip 1, the nozzle 2, the orifice 3, and the tip holder 5 are exposed to a high temperature during welding due to the influence of radiant heat accompanying the generation of an arc. When the temperature of the contact tip 1 or the like rises, when spatter generated during welding adheres, the intermolecular motion of the spatter becomes active on the adhesion surface, leading to welding. There is also a risk of deformation due to temperature rise.

  However, in this embodiment, the temperature rise of the contact chip 1 or the like is suppressed by mounting the chip holder heat radiating member 7, the nozzle heat radiating member 8, and the contact chip heat radiating member 9 formed of a carbon compound. . And each heat radiating member 7, 8, 9 does not contain a metal compound. Therefore, spatter welding can be suppressed, and the cleaning frequency and cleaning time for removing spatter can be greatly reduced.

  Moreover, the deformation | transformation by a heat | fever can be suppressed by suppressing a temperature rise. In particular, if the temperature rise of the contact tip 1 is suppressed, wear of the insertion hole 21 due to contact between the welding wire and the inner peripheral surface of the insertion hole 21 can be suppressed. As a result, it is possible to prevent the welding current from being poorly fed and to extend the replacement life of the contact tip 1.

  Further, by suppressing the temperature rise of the contact chip 1 or the like, the temperature rise in the space surrounded by the nozzle 2 and the contact chip 1, that is, the inside of the nozzle 2 can be suppressed. As a result, the orifice 3 is not required to have a heat resistant performance such as ceramic, and the orifice 3 can be formed of resin. Although the orifice 3 may be formed integrally with the chip holder 5, heat-resistant resin such as fluororesin has low surface energy. Therefore, by forming the orifice 3 with heat-resistant resin, sputtering welding to the orifice 3 can be performed. It can be prevented more reliably.

  The tip holder 5 has a smaller temperature rise during welding than the contact tip 1 and the nozzle 2. That is, only the nozzle heat radiating member 8 and the contact chip heat radiating member 9 can provide a temperature rise suppressing effect. Therefore, the chip holder 5 may be formed of a heat resistant resin like the orifice 3 without mounting the chip holder heat radiating member 7. Thereby, the welding of the sputter | spatter to the chip holder 5 can be suppressed more effectively.

  As described above, according to the present embodiment, the following effects can be obtained.

  (1) By joining the contact chip heat dissipating member 9 to the outer periphery of the contact chip 1, it is possible to suppress deformation of the contact chip 1 due to heat, and as a result, it is possible to suppress displacement of the welding target position.

  (2) A chip holder heat radiating member 7, a nozzle heat radiating member 8, and a contact chip heat radiating member 9 which are formed of a carbon compound and do not contain a metal compound are attached to the contact chip 1, the nozzle 2 and the chip holder 5. ing. Thereby, the temperature rise of the contact chip 1 or the like can be suppressed, and spatter welding and deformation due to heat can be suppressed.

  (3) By forming the tip holder 5 and the orifice 3 with heat-resistant resin, it is possible to prevent spatter welding that occurs during welding.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made within the scope of the technical idea described in the claims.

DESCRIPTION OF SYMBOLS 1 Contact tip 2 Nozzle 3 Orifice 3A Discharge hole 4 Insulator 5 Tip holder 5A Through-hole 6 Torch body 7 Tip holder heat radiation member 8 Nozzle heat radiation member 9 Contact chip heat radiation member 10 Surge chamber 20 Insertion hole 21 Insertion hole

Claims (3)

A cylindrical torch body,
A cylindrical tip holder that is attached to the tip of the torch body and has a through-hole that communicates the inner peripheral side and the outer peripheral side;
A contact tip attached to the tip of the tip holder;
An insulator attached to the tip of the torch body so as to surround the chip holder;
A nozzle mounted on the tip side of the insulator so as to surround the tip holder and the contact tip;
A discharge hole that forms a surge chamber between the tip holder and the outer peripheral surface including the through hole and communicates between the inner peripheral side and the outer peripheral side at a tip side from a portion surrounded by the insulator. An orifice having,
In a welding torch having
A heat radiating member formed of a carbon compound not containing a metal compound is joined to the outer peripheral surface including at least the tip of the contact chip ,
A welding torch in which the tip holder and the orifice are formed of a heat-resistant resin .   The welding torch according to claim 1, wherein a heat radiating member formed of a carbon compound not containing a metal compound is joined to an inner peripheral surface including at least a tip portion of the nozzle.   The welding torch according to claim 1 or 2, wherein a heat radiating member formed of a carbon compound not containing a metal compound is joined to an outer peripheral surface including at least a tip portion of the tip holder.

Images