JPS6092086A - Nozzle for gas shielded arc welding - Google Patents

Abstract

PURPOSE:To prevent adhesion of spatter, improve its separation and prevent short circuiting phenomenon between a chip and welded object by forming a nozzle member of a nonconductive material such as ceramic etc. CONSTITUTION:To assemble a welding nozzle 3, an inner peripheral thread 6 of a supporting ring 2 is screwed to the tip of the welding torch 1 with an outside fastening ring 4 screwed to the outer peripheral thread 7 of the supporting ring 2. Then, the nozzle member 3 formed of a nonconductive material is inserted between holding pawls 8 and thrusted in until a connecting projection 10 enters a concave groove 12. With the connecting projection 10 fitted in the recessed groove 12, the outside fastening ring 4 is rotated and shifted to the tip side, and the holding part 16 of the outside fastening ring 4 is brought into contact with the tapered part 11 of the supporting ring 2 by pressing. Thus, assembling is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas shielded arc welding nozzle, and more particularly to a gas shielded arc welding nozzle with improved durability and welding workability.

Conventionally used nozzles for gas shielded arc welding are integrally formed of metal (1iJ) and are used by screwing onto the tip of the welding torch. In the nozzle, the nozzle tip 61i19B wears out during use, making it easy for welding spatter to adhere to the nozzle, causing welding work to be interrupted to remove spatter, or requiring a great deal of effort to remove firmly adhered spatter. The disadvantage is that it requires effort. Moreover, the adhering spatter bridges the gap 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 This caused problems such as damage to not only the torch but also the torch itself. This not only causes the disadvantage of economic loss due to damage to equipment, but also puts psychological pressure on workers who have to be careful about the short-circuit phenomenon described above during welding work. It is also a contributing 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 ceramic, but as is well known, ceramic Since this material is easily damaged, even if a gas-shielded arc welding nozzle of the same shape as a conventional one is formed using this material, it is considered extremely difficult to put it into practical use as it is.

This invention was made in view of the above, and its purpose is to provide a gas-shielded arc welding nozzle that is resistant to adhesion of spatter (and has good spatter removability) and that can prevent the short-circuit phenomenon described above. Our goal is to provide the following.

The gas-shielded arc welding nozzle of the present invention, which achieves the above object, includes a support ring attached to the tip of a welding torch, a cylindrical nozzle member fitted to the tip of the support ring, and an outer peripheral portion of the support ring. The support ring has threaded portions on the inner and outer peripheries of its base, and a plurality of gripping claws disposed in the circumferential direction on its tip side, and The claw further has a radially inward engaging protrusion, and the nozzle member is formed of a non-conductive material such as ceramic, and at least an outer peripheral portion of one end of the nozzle member is provided on the gripping claw. The outer tightening ring has a threaded portion on the inner periphery of its base that can be threadedly engaged with the outer threaded portion of the support ring, and the outer tightening ring has a threaded portion on its distal end that can be threaded into the outer threaded portion of the support ring. It is characterized by having a holding part that covers the outer periphery of the gripping claw part.

As mentioned above, since the nozzle member is made of a non-conductive material such as ceramic, it is difficult for spatter to adhere and its peelability is good. It becomes possible to prevent short-circuit phenomena between the two, and it becomes possible to significantly improve the durability of the gas-shielded arc welding nozzle and the welding workability.

Moreover, since the above-described structure is adopted, the nozzle member can be attached and detached by simply loosening the outer tightening ring, that is, by one-touch operation, which is extremely convenient.

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

In the figure, 1 is a welding torch, and a support ring 2 is attached to the tip of the torch.A cylindrical nozzle member 3 is fitted to the tip of the support ring 2. An outer tightening ring 4 is screwed onto the outer periphery of the holder. As shown in FIGS. 2 and 3, the support ring 2 has threaded portions 6 on the inner and outer peripheries of its base 5, respectively.
7 is provided, and an inner circumferential threaded portion 6 is screwed onto the tip of the welding torch l. A plurality of (six in the figure) gripping claws 8 are provided on the distal end side of the support ring 2, and the gripping claws 8 in this case are It is formed by providing six slits 9 extending parallel to the axial direction in a substantially cylindrical portion extending from 5 toward the distal end side.

Furthermore, an engaging protrusion 10 having a semicircular cross section and protruding radially inward is provided on the inner peripheral portion of the distal end of each of the gripping claws 8 . Incidentally, a tapered portion 11 is provided on the outer peripheral portion of the gripping claw portion 8, and the diameter thereof gradually increases from the base side toward the distal end side.

As shown in FIG. 4, the nozzle member 3 is a cylindrical member, and grooves 12 having substantially the same cross-sectional shape as the engaging protrusion 10 are formed on the outer periphery near both ends of the nozzle member 3. It is surrounded. To form this nozzle member 3,
Although non-conductive materials such as ceramics are used, 35N4 is a material with excellent high-temperature strength, wear resistance, and heat shock resistance, and is particularly preferred as a material for the nozzle member 3. has been confirmed. In addition, the above S
With i3N4, A 1. A test was also conducted using the nozzle member 3 made of O3, and it was confirmed that the nozzle member 3 made of 5ffi3 N4 was much better in terms of both the amount of spatter adhesion and the spatter removability.

As shown in FIG. 5, the outer tightening ring 4 has a threaded portion 7 provided on the inner periphery of the base 13 on the outer periphery of the support ring 2.
It has a threaded part 14 that can be tightly connected to the threaded part 14, and has a cylindrical part 15 on its distal end side. The inner diameter of this cylindrical portion 15 is selected to be smaller than the maximum diameter of the tapered portion 11 of the gripping claw portion 8 and larger than the minimum diameter, and serves as a holding portion 16.

Note that various materials can be used to form the support ring 2 and the outer tightening ring 4, but materials that have good workability and can impart sufficient elasticity to the gripping claw portion 8 are used. , Nozzle member 3 from the welding torch main body side
Copper-based materials such as copper and brass are particularly suitable in that they have good thermal conductivity to the extent that they can effectively cool the material.

Next, a procedure for assembling the gas-shielded arc welding nozzle as described above will be explained. First, with the outer tightening ring 4 secured to the outer threaded portion 7 of the support ring 2, the inner threaded portion 6 of the support ring 2 is screwed onto the tip of the welding torch 1. Next, the nozzle member 3 is inserted between the gripping claws 8 and pushed in until the engaging protrusion 10 fits into the groove 12.

Then, with the engagement protrusion 10 fitted into the groove 12, the outer tightening ring 4 is rotated to move it toward the tip side, and the holding portion 16 of the outer tightening ring 4 is attached to the tapered portion 11 of the support ring 2. Assembly is completed by pressing them into contact. In this way, since the holding part 16 of the outer tightening ring 4 is brought into pressure contact with the tapered part 11 of the support ring 2, it is possible to prevent the gripping claw part 8 from expanding, and the nozzle member 3 is pressed during welding work. It is possible to effectively prevent the material from falling off. In addition, when replacing the nozzle member 3,
All you have to do is rotate the outer tightening ring 4 in the opposite direction to the above and move it toward the base side, release the pressure on the tapered part 11 by the holding part 16, and pull out the nozzle member 3 from the gripping claw part 8. In the above embodiment, the nozzle member 3 is provided with two grooves 12, 12 near both ends, which means that when one end near the arc wears out, the nozzle member 3 is reversed and Of course, it is also possible to provide the groove 12 only at one end so that it can be used again.

Although one embodiment of the gas-shielded arc welding nozzle of the present invention has been described above, the gas-shielded arc welding nozzle of the present invention is not limited to the above-mentioned embodiment. It is possible to make various changes within the scope of the purpose of the present invention, such as changing the shape and arrangement thereof.

The gas-shielded arc welding nozzle of the present invention is configured as described above. Therefore, according to the gas-shielded arc welding nozzle of the present invention, spatter is less likely to adhere and its removability is good. Furthermore, it is possible to prevent a short circuit between the tip and the object to be welded, and as a result, it is possible to significantly improve the durability of the gas-shielded arc welding nozzle and the workability of welding.

The average service life of the gas-shielded arc welding nozzle of this invention is several times longer than that of conventional nozzles! I agree. Moreover, the film deposition on the nozzle member can be done simply by rotating the outer tightening ring, that is, in one operation, which is extremely convenient.

[Brief explanation of drawings]

Fig. 1 is a central vertical sectional view of an embodiment of the gas shield door welding nozzle of the present invention, Fig. 2 is a central longitudinal sectional view of the support ring used in the above A side view of the ring, FIG. 4 is a central vertical cross-sectional view of the nozzle member used in the above, and FIG. 5 is a central vertical cross-sectional view of the outer tightening ring used in the above. ■... Welding torch, 2... Support Ring, 3... Nozzle member, 4... Outer tightening ring, 6... Threaded part, 7
... Threaded portion, 8... Gripping claw portion, 10... Engaging protrusion, 12... Concave groove, 14... Threaded portion, 16... Holding portion. Figure 1 Continued from page 1 0 Inventor Isao Fukunaga Inside Higashisha Kobe Factory, Chuo-ku, Kobe City

Claims (1)

[Claims] 1. It has a support ring screwed onto the tip of the welding torch, a cylindrical nozzle member fitted onto the tip of the support ring, and an outer tightening ring screwed onto the outer periphery of the support ring. ,
The support ring has threaded portions on the inner and outer peripheries of its base, and a plurality of gripping claws disposed circumferentially on its tip side, and the gripping claws further engage radially inward. The nozzle member has a protrusion, and the nozzle member is made of a non-conductive material such as ceramic, and has a groove on at least one end side of the outer periphery into which the engagement protrusion provided on the gripping claw can fit. The outer tightening ring has a threaded part on the inner periphery of its base that can be threadedly engaged with the outer threaded part of the support ring, and has a holding part on its tip side that covers the outer periphery of the gripping claw part. A gas shielded arc welding nozzle characterized by: