JPH07266048A - Contact tip of welding torch - Google Patents

Abstract

PURPOSE:To make it possible to make a working cost inexpensive, to make not only the working cost but also a tip itself inexpensive, to prevent a harmful effect caused by spatter, and to enhance the quality of a weld zone. CONSTITUTION:In the contact tip of a welding torch, whose one tip part 1a is formed to be a male screw and the inserted-through hole 1d of an electrode 2 is pierced in an axial center position from this one tip part la to another tip part 1b, the diameter of a tip main body 1 from the one tip part 1a to another tip part 1b, is formed in the same shape. Also, the diameter of another tip part 1b, is made smaller than that of the tip main body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch contact tip, and more specifically, for example, MAG (Meta).
The present invention relates to a contact tip of a welding torch used for 1-Active-Gas welding or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a contact tip of a welding torch of this type is generally formed such that one end 1a is formed in a male screw shape, and an electrode is provided at an axial center position from the one end 1a to the other end 1b. The two insertion holes 1d were penetrated. In the conventional product, the position from the one end 1a of the chip body 1 is
For example, it is chamfered in the shape of a hexagonal nut, and the other end 1b from the body
The diameter was the same throughout.

[0003]

In the case of the conventional product, since the nut-shaped chamfered portion is formed on the chip body as described above, it takes much time and labor for processing and the product cost is high. Further, in the conventional product, the diameter of the other end portion was formed to be the same as the diameter of the body portion, so that the shield gas flowing through the gap formed between the peripheral surface of the chip body and the inner peripheral surface of the nozzle cap is the tip of the nozzle cap. After exiting, it was easy to disperse and spread outward, as shown in FIG. 5B. Therefore, when the conventional product is used, there is a problem that the protection between the arc and the deposited metal becomes insufficient.

By the way, in this type of contact tip,
It is unavoidable that spatter (grains such as droplets scattered around the welded portion) adhere to the peripheral surface of the tip of this kind tip or the inner peripheral surface of the nozzle cap (see FIG. 5B). However, in the conventional product, since the diameter of the other end of the chip body was formed to be the same as the diameter of the body as described above, spatter was blocked in the gap between the inner peripheral surface of the nozzle cap and the peripheral surface of the tip of the chip. It was easy. Therefore, when using a conventional product, the above gap becomes narrower, and the flow of the shield gas is likely to be hindered,
It was difficult to weld in the desired gas atmosphere. Also, according to the conventional product, spatter easily adheres to the other end of the chip body, etc.Therefore, it is troublesome for an operator to frequently brush this part with a metal brush or the like. Since the chip itself is expensive when it is replaced, there is a problem that running cost and maintenance cost are high.

The present invention is intended to solve the problems of such conventional products. Therefore, the technical problem of the present invention is to provide a welding torch which is formed so as to reduce the processing cost and, in turn, the tip itself, and to prevent the adverse effect of spatter, and to obtain a welded portion of good quality. To provide contact chips.

[0006]

The present invention employs the following technical means in order to solve the above problems. That is, according to the present invention, the one end 1a is formed in a male screw shape, and the one end 1a is formed.
In the contact tip of the welding torch in which the insertion hole 1d of the electrode 2 penetrates from a to the other end 1b at the axial center position, the diameter of the tip body 1 from the one end 1a to the other end 1b is formed to be the same. In addition, the other end portion 1b is formed to have a diameter smaller than that of the chip body 1.

In this case, according to the present invention, the screw thread formed on the one end portion 1a has two or more threads in order to reduce the processing cost.
It is preferably three laps. Further, in the present invention, the other end 1b is provided so that the shield gas can be smoothly guided toward the electrode.
Is a tapered taper surface portion 1 that is continuous from the chip body 1.
It is desirable that the diameter is reduced via c.

[0008]

In the present invention, the diameter of the other end 1b is smaller than that of the chip body 1. Therefore, the shielding gas is
It is jetted so as to wind around the electrode 2 protruding from the end surface of the other end portion 1b along the peripheral surface of the other end portion 1b. In the present invention,
Even if impurities such as spatter adhere to the other end portion 1b, since the diameter of the other end portion 1b is small, a gap is formed between the other end portion 1b and the inner peripheral surface of the nozzle cap 7, so that gas outflow is less likely to be hindered. Further, in the case of the present invention, since the other end 1b is formed in a tubular shape having a reduced diameter and is not formed in a tapered surface, spatter is unlikely to adhere.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 is a chip body formed of a conductive metal material such as copper, brass, or aluminum. One end 1a of the chip body 1 is formed in a male screw shape having two to three screw threads.

The diameter of the chip body 1 extending from the one end 1a to the other end 1b is the same as 6 mm in this embodiment. The diameter of the other end portion 1b is smaller than that of the chip body 1, and in this embodiment, the diameter is 3.5 mm, for example. Reference numeral 1c is a taper-shaped taper surface portion that is continuous from the chip body 1. The other end portion 1b has a reduced diameter in this embodiment via the tapered surface portion 1c.

Reference numeral 1d is an insertion hole for the electrode 2. The insertion hole 1d is selected to have a diameter of 1 mm, for example, and penetrates from the one end portion 1a of the chip body 1 to the other end portion 1b at the axial center position.

The electrode 2 is a wire having a diameter of 0.8 mm, and the wire as the electrode 2 is wound in a coil shape and provided in the wire supply device 3. The wire feeder 3 continuously feeds this wire into the torch 4,
It is sent out from the other end 1b of the chip body 1 through the insertion hole 1d. The wire as the electrode 2 is energized through the tip of the present invention, and an arc is generated between the wire and the base material 6 to perform welding. Reference numeral 5 is a DC welding power source.

Numeral 7 is screwed onto the male screw 4a of the torch 4,
It is a nozzle cap attached to the head of the torch 4.
The tip of the present invention has a female screw 4b of the torch 4 at one end 1a.
It is screwed into and attached to the head of the torch 4, and in this state it is covered with this nozzle cap 7. As shown in FIG. 2, the male screw 4 is provided on the upper end portion (base end portion) of the nozzle cap 7.
A female screw 7a that is screwed with a is formed. In this embodiment, the female screw 7a has a screw thread formed in two or three turns so as to reduce the time and effort required for processing and to speed up the mounting work. The inner peripheral surface of the nozzle cap 7 may be coated with a surface treatment material such as ceramics so as to reduce the deposition rate of spatter and facilitate removal of spatter.

Reference numeral 4c is a shield gas outflow hole formed in the head of the torch 4. Examples of the shield gas include carbon dioxide gas, a mixed gas of carbon dioxide gas and argon, and the like. The shielding gas is supplied from the outflow hole 4c to the chip body 1
Flows through a gap S (see FIG. 1, etc.) formed by the peripheral surface of the nozzle cap 7 and the inner peripheral surface of the nozzle cap 7, and jets from the tip (opening) of the nozzle cap 7 to protect the arc and the deposited metal.

Next, the operation of this embodiment will be described. First, an operator screw-attaches the one end portion 1a to the female screw 4b of the torch 4. In this case, since the screw thread of the one end portion 1a is formed in a few turns, it can be easily and quickly attached.

At the time of welding, the shield gas flowing out from the outflow hole 4c into the gap S is ejected so as to wind around the wire as the electrode 2 along the peripheral surface of the other end 1b to protect the arc and the deposited metal. This is because the diameter of the other end 1b is smaller than that of the chip body 1.

Further, since the diameter of the other end portion 1b is reduced and the peripheral surface of the other end portion 1b has a vertical surface shape, spatters generated during welding are unlikely to adhere to the peripheral surface of the other end portion 1b in the present invention.
Further, in the case of the present invention, since the opening surface of the tip end portion of the nozzle cap 7 expands as the diameter of the other end portion 1b is reduced, even if spatter adheres to the peripheral surface of the other end portion 1b, etc. It will be less likely to interfere with the distribution of.

Although the diameter of the other end portion 1b is reduced through the tapered surface portion 1c in the above example, the present invention is not limited to this. That is, for example, as shown in FIG. 4, the present invention may omit the tapered surface portion 1c and reduce the diameter directly from the chip body 1.

The contact tip of the present invention is not only used for a welding torch in the case of MAG welding, but also for other purposes such as MIG (Metal-Inert-Gas) welding,
Of course, it can be applied to a welding torch in the case of TIG (Tungsten-Inert-Gas) welding.

[0020]

As described above, in the contact chip of the present invention, the diameter of the chip body from one end to the other end is formed to be the same, and the diameter at the other end is smaller than that of the chip body. Therefore, in the case of the present invention, since the chip body can be formed by using the standardized tube as it is, the time and labor required for processing the chip body can be reduced, and the manufacturing cost can be reduced accordingly and the product can be manufactured at a low cost. Can be provided to. Further, in the present invention, since the diameter of the other end is reduced, the shield gas flows out from the peripheral surface of the other end toward the electrode so as to converge, and is jetted so as to wind around the electrode. Therefore, according to this, there is an effect that the shield effect is enhanced, and a welded portion with good quality can be obtained. In the case of the present invention, since the diameter of the other end is reduced, the peripheral surface of the other end is small, and the other end is not a taper surface but a vertical surface. There is an advantage that spatter that occurs is less likely to adhere to the other end. Further, according to the present invention, even if spatter adheres, the distance between the inner peripheral surface of the nozzle cap and the peripheral surface of the other end is wide at the tip of the nozzle cap because the diameter of the other end is reduced, so that the gas flows out. Is less susceptible to problems. Therefore, according to the present invention, the maintenance period for removing spatters can be extended and the running cost can be reduced.

When the screw thread formed at one end has two to three turns as described in claim 2, it is possible to reduce the labor and time required for processing the one end, so that the product cost can be further reduced. It is possible to provide an inexpensive chip of this kind.

Further, when the diameter of the other end is reduced through the tapered taper surface portion continuing from the chip body as in claim 3, the gas smoothly flows along the taper surface portion and the circumference of the other end portion. There is an advantage that it is easily guided to the surface and the shield effect is further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts in a use state showing a preferred example of the present invention.

FIG. 2 is an exploded front view illustrating the operation of the present invention.

FIG. 3 is a cross-sectional view of an essential part in use for explaining the operation of the present invention.

FIG. 4 is a cross-sectional view of an essential part in a use state for explaining another embodiment of the present invention.

FIG. 5 shows a conventional example, A is an exploded front view, and B is a cross-sectional view of essential parts in a use state.

[Explanation of symbols]

 1 chip body 1a one end part 1b other end part 1c taper surface part 1d insertion hole 2 electrode

Claims (3)

[Claims] 1. A contact tip of a welding torch in which one end is formed in a male screw shape, and an electrode insertion hole is penetrated from the one end to the other end at a shaft center position, wherein the one end to the other end. A contact tip of a welding torch, characterized in that the tip body has the same diameter, and the other end has a diameter smaller than that of the tip body. 2. The contact tip of the welding torch according to claim 1, wherein the screw thread formed at one end has two to three turns. 3. The contact tip of a welding torch according to claim 1, wherein the other end portion is formed with a reduced diameter through a tapered tapered surface portion continuing from the tip body.