JPS61286075A - Nozzle for gas shielding arc welding - Google Patents

Abstract

PURPOSE:To prevent the adhesion of spatters, to improve the separating thereof and to prevent the short-circuit between the chip and a body to be welded by forming the nozzle member with the nonconductive material of ceramics, etc. CONSTITUTION:The nozzle has the supporting ring 2 to be fitted to the tip part of a welding torch 1, the cylindrical nozzle member 3 to be fitted to the tip side of the supporting ring 2 and the holding ring 4 to be arranged on the outer peripheral part of the supporting ring 2 and nozzle member 3 for fixing the nozzle member 3 to the supporting ring 2. The nozzle member 3 is formed by the nonconductive material of ceramics, etc. having the projecting part 8 to the external part in the radial direction at the one end side thereof. The holding ring 4 has the engaging face 9 engaging with the projecting part 8 on the inner peripheral part. On the holding ring 4 the press deforming part 13 fitting to a step part 12 by fitting to the inner part in the diameter direction is formed. The ring 4 is fixed to the ring 2 by the deforming part 13 and the nozzle member 3 is fixed to the ring 2 by the ring 4.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a gas shielded arc welding nozzle, and particularly to a gas shielded arc welding nozzle with improved durability and welding workability. Related.

(Prior art and its problems) Gas-shielded arc welding nozzles that have been used in the past are integrally formed of metal (copper) and are used by screwing onto the tip of a welding torch. be.

With this gas-shielded arc welding nozzle, the tip of the nozzle wears out during use, making it easy for welding spatter to adhere to the welding process. The disadvantage is that removing spatter requires a lot of effort. Moreover, the adhered spatter causes bridging between the welding tip and the nozzle, and when the nozzle comes into contact with the workpiece during welding work, the welding tip and the workpiece are short-circuited through the nozzle, and the nozzle as well as the nozzle This caused problems such as damage to the torch itself. This not only causes the disadvantage of economic loss due to damage to equipment, but also causes psychological pressure on workers who must always be aware of the above-mentioned short-circuit phenomenon during welding work. It is also a factor.

In addition, even in automatic welding using robots, etc., whose application has been rapidly expanding in recent years, from the perspective of continuous work over long periods of time, spatter adhesion to the nozzle as described above and associated equipment Prevention of damage has become one of the important technical challenges.

In order to prevent the above-mentioned drawbacks, it may be possible to form the entire gas-shielded arc welding nozzle from a non-conductive material such as ceramics, but ceramics
As is well known, the material is easily damaged if it has notches, so even if a single gas shield door welding nozzle with the same shape as the conventional one is made using this material, it cannot be put into practical use as is. It is thought that it would be extremely difficult to provide the

Therefore, the present applicant filed an earlier application (Japanese Patent Application No. 58-20057).
In No. 3), a support ring is screwed onto the tip of the welding torch, and a grip claw having an engaging protrusion is formed on the tip of the support ring, while the outer periphery of one end of the ceramic nozzle member is proposed a welding nozzle having a structure in which a groove is provided around the circumference and a nozzle member is fixed to a welding torch by fitting an engaging protrusion into the groove.

Although this welding nozzle can eliminate the above-mentioned drawbacks, the nozzle member requires high dimensional accuracy due to the use of the above-mentioned concave-convex fitting, so machining requires a large amount of time. As a result, the nozzle member becomes expensive.

This invention was made in view of the above, and its purpose is to prevent spatter from adhering, to have good removability, to prevent short-circuiting as described above, and to be manufactured at low cost. An object of the present invention is to provide a gas-shielded arc welding nozzle that can be used for gas-shielded arc welding.

(Means for solving the problem) Therefore, the gas shielded arc welding nozzle of the present invention has the following features:
As shown in FIG. 1, a support ring 2 is attached to the tip of a welding torch 1, a cylindrical nozzle member 3 is attached to the tip of the support ring 2, and the nozzle member 3 is fixed to the support ring 2. In order to do this, it has a support ring 2 and a retaining ring 4 disposed around the outer periphery of the nozzle member 3. The nozzle member 3 is made of a non-conductive material such as ceramics, and has a radially outward protrusion 8 on one end thereof.
, for example, has a ring spring. Further, the retaining ring 4 has an engaging surface 9 on its inner circumference that engages with the protrusion 8. Further, the support ring 2 has a stepped portion 12 facing toward the proximal end on its outer periphery. And as shown in Figure 2,
The retaining ring 4 is fitted radially inward at a position closer to the proximal end than the stepped portion 12 in a state in which the engaging surface 9 is engaged with the protruding portion 8 to form the stepped portion. A pressing deformation portion 13 that engages with the support ring 12 is formed, and the deformation portion 13 fixes the retaining ring 4 to the support ring 2, and the retaining ring 4 secures the nozzle member 3 to the support ring 2.

(Function) Since the nozzle member 3 is used as described above and is made of a non-conductive material such as ceramics,
Spatter is less likely to adhere, and its peelability is good, making it possible to prevent short circuits between the tip and the workpiece, and improving the durability of gas-shielded arc welding nozzles. becomes. Moreover, since welding can be performed with the nozzle member 3 in contact with the workpiece, it is possible to prevent shield failure due to the influence of wind, and the arc length can always be kept constant, making it possible to perform welding work. It becomes possible to improve efficiency.

Furthermore, since the above structure is employed, the nozzle member 3 is not required to have high dimensional accuracy, and the nozzle member 3 and, by extension, the entire welding nozzle can be provided at low cost. In this case, the support ring 2 and the holding means 4 are fixed to each other with the engagement surface 9 of the holding means 4 engaged with the protrusion 8 of the nozzle member 3. 3 and the holding means 4 can be handled as a single component, which is convenient for nozzle replacement work and the like.

Furthermore, as described above, by forming the pressing deformation portion 13 on the retaining ring 4, the retaining ring 4 is fixed to the support ring 2, and the nozzle member 3 is also fixed. The work can be done easily and the nozzle member 3 can be securely fixed.

(Example) Next, specific examples of the gas shielded arc welding nozzle of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, 1 is a welding torch,
A support ring 2 is attached to its tip. A cylindrical nozzle member 3 is attached to the tip of the support ring 2, and a retaining ring 4 is fixed to the outer periphery of the support ring 2.

The support ring 2 is provided with a threaded portion 5 on the inner periphery of its proximal end, and this threaded portion 5 is screwed onto the tip of the welding torch 1. A support step 6 extending in the axial direction is formed at the tip of the support ring 2, and one end of the nozzle member 3 is fitted into the support step 6. Note that the formation of this support step portion 6 may be omitted depending on the case, and the end surface of the nozzle member 3 may be held in a state in which it is in contact with the tip end surface of the support ring 2. A groove 14 is provided around the proximal side of the groove 14, and this groove 14 is for forming a stepped portion 12 facing toward the proximal end. Note that the role of this stepped portion 12 will be described later.

The nozzle member 3 is a cylindrical member, and grooves 7.7 are provided around the outer periphery near both ends of the nozzle member 3, respectively. A ring spring 8 is fitted into one of the recesses 7, and this ring spring 8 serves as a protrusion that engages with an engagement surface to be described later. To form this nozzle member 3, non-conductive materials such as ceramics are used, and among them, Si3N4 and ceramics mainly composed of it are materials with excellent high-temperature strength, abrasion resistance, and thermal shock resistance. It has been confirmed that this material is particularly preferable as a material for the nozzle member 3. In addition, the above Si
Along with 3N+ etc., AlU0. A test was also conducted using a nozzle member 3 made of Si3N4, etc., and it was confirmed that the nozzle member 3 made of Si3N4 or the like was far superior in terms of both the amount of spatter attached and the sputter removability.

The retaining ring 4 has a tapered engagement surface 9 formed on the inner peripheral surface of its tip. The engagement surface 9 is formed such that its distal end side is inclined radially inward, and becomes a portion that engages with the ring spring 8 described above.

Note that various materials can be used to form the support ring 2 and the retaining ring 4;
Copper-based materials such as copper and brass are particularly suitable because they have good workability and good heat conduction to the extent that the nozzle member 3 can be effectively cooled from the welding torch main body side.

The gas-shielded arc welding nozzle described above is assembled using the following procedure. First, one end of the nozzle member 3 is fitted into the support step 6 provided at the tip of the support ring 2 . Then, in this state, the retaining ring 4 is fitted into the outer peripheral portion of the supporting ring 2. Then, the engagement surface 9 of the retaining ring 4 is connected to the ring spring 8.
At the same time, the retaining ring 4 is pushed toward the support ring 2 side, and the base end of the nozzle member 3 is pressed against the support step 6 of the support ring 2. Opposing positions on the outer periphery of the retaining ring 4 are pressed radially inward to form a pressed deformation portion 13.13. This press deformation work is preferably carried out by spot welding, since the fixing of the retaining ring 4 to the support ring 2 involves the engagement of the press deformation portion 13 with the stepped portion 12 and the welding by the spot welding. This is because the above-mentioned nozzle member 3 can be reliably fixed. Note that the pressing deformation portion 13 can be formed by a method other than the spot welding method, and the number of deformation portions 13 to be formed is also arbitrary. The support ring 2, nozzle member 3, and retaining ring 4, all of which are fixed as described above, are attached to the welding torch 1 for use.

In the above-mentioned welding nozzle, the ceramic nozzle member 3 is arranged at the tip of the nozzle, so that it is difficult for spacks to adhere to the welding nozzle. It is possible to prevent a short circuit phenomenon between the welding nozzle and an object, and it is possible to improve the durability of the welding nozzle.

Moreover, since welding can be performed with the nozzle member in contact with the workpiece, shielding failure due to the influence of wind can be prevented, and the arc length can always be kept constant, increasing welding work efficiency. It becomes possible to improve.

Furthermore, since the above-mentioned attachment structure is adopted, the nozzle member 3 does not require high dimensional accuracy as in the past, and machining becomes easy, and the nozzle member 3 and, by extension, the welding nozzle can be provided at low cost. It becomes possible to do so. Further, since each ring 2.4 and the nozzle member 3 are integrally fixed as described above, the whole can be handled as one component, which is convenient for work.

Furthermore, as described above, by forming the pressing deformation portion 13 on the retaining ring 4, the retaining ring 4 is fixed to the support ring 2, and the nozzle member 3 is also fixed. The work can be done easily and the nozzle member 3 can be securely fixed.

Examples of changes in the formation structure of the step portion 12 are shown in FIGS. 3 to 6. FIG. 3 shows an example in which the stepped portion 12 is formed by providing a small diameter portion 15 on the base end side of the support ring 2, and FIG. FIG. 5 shows an example in which the stepped portion 12 is formed into a tapered shape.
Further, FIG. 6 shows an example in which the stepped portion 12 is formed by providing a protrusion 17 on the outer peripheral portion of the support ring 2. As shown in FIG. Note that the formation structure of this stepped portion 12 is not limited to the above-mentioned structure, and any structure may be used as long as it can prevent the pressing deformation portion 13 from being pulled out. Also, as mentioned above, the support ring 2
The reason why the stepped portion 12 is formed over the entire circumference is to facilitate processing of the support ring 2, and the stepped portion 12 may be formed only at the position where the pressing deformation portion 13 is provided.

FIG. 7 shows another embodiment of the arc welding nozzle. In this embodiment, an elastic body 10 such as silicone rubber or a plate spring is interposed between the base end of the nozzle member 3 and the stepped portion 6 of the support ring 2, and this elastic body 10 allows the nozzle member 3 to The elastic body 10 is designed to provide more reliable support and to absorb dimensional errors in each part.

Note that the other parts are the same as those in the first embodiment, so the same parts are given the same reference numerals and the explanation thereof will be omitted.

In each of the above embodiments, an example is shown in which the protrusion 8 is formed using a ring spring, but this is to facilitate the processing of the nozzle member 3, and in some cases, the protrusion 8 may be
As shown in the figure, the protrusion 8 may be formed integrally with the nozzle member 3. Further, as shown in FIG. 9, the nozzle member 3
The outer circumference of the nozzle member 3 can be formed into a tapered shape and this tapered outer circumference can be used as the protrusion 8. Alternatively, as shown in FIG. 8 may be integrally formed. Further, the engaging surfaces 9 described above are all formed in a tapered shape, and this is because the axial center position of the nozzle member 3 is determined by pressing the nozzle member 3 radially inward from its periphery. Of course, it is also possible to form the engaging surface 9 on a plane perpendicular to the axis of the nozzle member 3.

(Effects of the Invention) In the gas-shielded arc welding nozzle of the present invention, since a non-conductive material such as ceramics is used as the nozzle member as described above, spatter is difficult to adhere to and its removability is also good. It also makes it possible to prevent short circuits between the tip and the workpiece.
As a result, it becomes possible to improve the durability of the gas shielded arc welding nozzle. Moreover, since a non-conductive material is used as mentioned above, it is possible to perform welding with the nozzle member in contact with the workpiece.
Since shield failure due to the influence of wind can be prevented and the arc length can always be kept constant, welding work efficiency can be improved. It has been confirmed that the average service life of the gas-shielded arc welding nozzle of the present invention is several times longer than that of conventional nozzles.

In addition, because the structure is such that the engagement surface on the retaining ring side engages with the protrusion on the nozzle member side, and the support ring and retaining ring are fixed in this state, the nozzle member requires high dimensional accuracy as in the past. This makes machining easier, and therefore it becomes possible to provide the nozzle member and, by extension, the welding nozzle at a low cost. Moreover, in this case, since the support ring, nozzle member, and retaining ring are fixed to each other, the whole can be handled as one component, which is convenient for nozzle replacement work.

Furthermore, as described above, by forming the press deformation part on the retaining ring, the retaining ring is fixed to the support ring and the nozzle member is fixed, so the above fixing work by spot welding etc. can be easily performed. Moreover, it becomes possible to securely fix the nozzle member.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway exploded perspective view of an embodiment of the gas-shielded arc welding nozzle of the present invention, FIG. 2 is a central vertical sectional view thereof, and FIGS. FIG. 7 is a longitudinal sectional view of a main part showing a modification of the nozzle, and FIGS. 8 to 10 are longitudinal sectional views of main parts showing a modification of the protrusion. DESCRIPTION OF SYMBOLS 1... Welding torch, 2... Support ring, 3... Nozzle member, 4... Retaining ring, 7... Concave groove, 8...
・Protrusion, 9... Engaging surface, 12... Step part, 13...
Pressure deformation part.

Claims (1)

[Claims] 1. A support ring attached to the tip of the welding torch, a cylindrical nozzle member attached to the tip side of the support ring, and an outer periphery of the support ring and nozzle member for fixing the nozzle member to the support ring. The nozzle member is made of a non-conductive material such as ceramics, and has a radially outward protrusion on one end thereof. The ring has an engagement surface on its inner periphery that engages with the protrusion, the support ring has a proximally facing step on its outer periphery, and the retaining ring has an engagement surface that engages with the protrusion. In a state in which the mating surface is engaged with the protrusion, a pressing deformation portion is formed that fits radially inward and engages with the step at a position closer to the proximal end than the step, and this deformation occurs. A nozzle for gas shielded arc welding, characterized in that the retaining ring is fixed to the support ring by a portion.