JPS59178183A - Arc welding torch - Google Patents

Abstract

PURPOSE:To improve working efficiency by an automatic welding machine in an arc welding torch using a welding wire as a consumable electrode by forming a contact chip to have a successively larger diameter near the root part thereof so that a spatter is dropped downward without being stuck to the root of the contact chip. CONSTITUTION:An arc welding torch has a contact chip 3, the outside circumference of which is covered by a gas nozzle 6 and therefore the spatter from a horizontal direction hardly enters the contact chip but the spatter scattering in a vertical direction jumps into the contact chip. An inclination of a suitable angle is consequently provided to the screwing part at the root of the chip 3 to force the spatter to drop opposite from the intruding direction without depositing in the spacing between the nozzle 6 and the chip 3, by which the drop of the spatter is accelerated and the turbulence in the shielding gas is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a torch for four-way welding using a welding wire as a consumable electrode.

[Prior art]

Conventionally, in this type of arc welding torch 1, a contact tip mounting body 2 is screwed or press-fitted into a torch body 1, as shown in FIG. A three-level two contact chip is screwed into the tip of the contact chip mounting body 2. The torch body 1 has a total length of 1. A pore 4 is formed throughout the pore 4, and a welding wire 5 passes through the pore 4. This pore 4 contains a shielding gas (usually ':'Oj
% supplied. A gas nozzle mount 7 (d) for mounting a gas nozzle 6 surrounding the contact chip 3 is screwed into the outer peripheral portion of the contact chip mount 2 .

An annular insulating insulator 81r is fitted near the tip of the contact chip mounting body 2. The tip of the contact chip mounting body 2? Shielding gas passages 9, 10'/+: are formed in the radial direction in the insulating insulator 8 and guiding the shielding gas from the pores 4 to the gas nozzle 6. In the embodiment, the shield gas holes 9 and 10 are arranged with different diameters and in the axial direction (rubbed).Normally, the through holes 9 are thick and have 4 holes, and the through holes 10 are thin and have 8 holes. In such a torch 1ζ, a stepped portion IF is formed at the root of the contact tip 3 and the tip of the insulating insulator 8, as is clear from the figure.

≠8 configuration, the spatter is attached to the welding width as shown in Fig. 2 at the stepped part 111 between the contact tip 3 and the gas nozzle 6, and the robot is adopted. Frequently used for automatic welding
If the inside of the machine had to be cleaned, the performance of the robot or automatic machine would be greatly reduced.

As described above, the reason why sputter adheres to the stepped portion 11 is not necessarily due to the force applied to the stepped portion 11.
Ko! ,? It is thought that this is because gas is involved.

If spatter is severely deposited on the gas nozzle V11, it will form a ring on the inner surface of the gas nozzle, obstructing the normal flow of the shielding gas sent from the rear of the torch, and causing post-melting defects (such as blowholes). It also encouraged the outbreak.

The shielding gas creates a turbulent flow at the step near the screwed part of the contact tip, completely shielding the arc during welding. This is one of the problems that must be solved in welding work.

[Object of the Invention] The object of the present invention is to prevent the spuck from occurring during mark welding (within the tip of the torch).
The purpose of this invention is to reduce the occurrence of troubles caused by this, and to provide stable supply of shielding gas to perform sound welding.

[Summary of the invention]

The present invention is a welding torch having a cylindrical gas nozzle surrounding the contact tip and a cylindrical gas nozzle that forms a pore for welding wire to come out. The structure is such that the ffl is sequentially increased in size.

In the present invention, the stepped portion 11 present in the conventional 1-ch is eliminated by this fl, and adhesion of spouts inside the torch is prevented.

[Embodiments of the invention]

An example of the rush current of the arc welding torch of the present invention is No. 3゜4(2).
ζ Shown are the torch wood body J and contact chip mounting 2. Contact tip 31 regular holes 4° delusion wire 5. Gas nozzle 6, gas nozzle mounting body 7, Mm insulator 8
．． The shielding gases 4R9 and 10Di, not shown in FIG. 1.2, have the same structure as that of the conventional A91.

The contact tip 3 near the base 9 has a truncated conical shape 13 I) I2. Ceremony name - 1 Eliminate the step 11 between the 8 and 7 insulators. A component diagram of this contact chip 3 is shown in FIG. 5.6. FIG.
oH4s° is preferable), and the sixth
The figure shown is formed so that the line represents a curved line.

Since the arc welding torch uses a gas nozzle outside the contact tip, it is difficult for horizontal spatter to enter, but spatter from vertical directions can be harmful. However, according to the present invention (if set to 0), the sputter collar I is deposited between the gas nozzle and the contact tip, and the angle corresponding to the screw hoof part &J + This has been improved to maintain the slope of the shielding gas, make it easier for spatter to fall, and prevent turbulent flow of the shielding gas.

Next, a case in which the torch of the present invention is specifically applied to a robot for producing vegetables will be explained using FIGS. 7 to 10.

21 (d robot main bed, 22 is an upper arm section provided vertically, and 23 is a forearm section that protrudes horizontally from the upper end of the upper arm section 22. 25 is a torch mounting bracket that is fixed to the wrist 24. 26 is a torch mounting bracket that will be described later and is a torch holding part that is attached via 25. 7 is a welding torch that is attached to the center assembly of the wrist 24. The torch 27 extends toward the wrist axis from a direction different from the line 2.The torch 27 is composed of a nozzle, a wire tip, an insulating ring, an insulating guide, etc., which will be described later. The wire 29 is passed through the shaft core by a conduit cable connected to the side. 30'7> Outside j1 A circular long-faced nozzle placed vertically; 32 is an insulating ring for spatter prevention arranged with wire tips 30 and nozzles 31; 22 insulating rings provided from the upstream end surface of the nozzle 31; 34 is a guide attached to the outer periphery of the insulated guide 33.
It has a wall thickness 34b with a pre-indicated force of 1, with a Japanese gauge, and a cutting feed 34b is installed at one end. T cylindrical down and 'moro'.

When this configuration is completed, a teaching operation 4 is performed to teach the position of the tip of the robot -1'', that is, the tip of the wire 29.At this time, the torch 27 is moved to the dimensional IC$γ&
l @ If the torch 27 enters the workpiece 35 and hits the insulated guide 33 of the torch 27 against the workpiece 351 ≠: Yes. In this case, if the protection gauge 34 is removed and removed, even if the protection gauge 34 comes into contact with 350 objects to be welded, the protection gauge 34 is visible and will act as a cushion without deforming the torch 27. Also, during teaching work, the distance between the insulated guide 33 and the workpiece 135 is kept constant (
The space between the insulated guide 33 and the workpiece 35 during teaching work, which can also be used as a gauge to maintain the safety, can be easily determined, and even if they come into contact, the torch 27 can be prevented from deforming.

With such a specific example, it is possible to easily confirm the minimum dimension by using the thickness of the protective gauge 34 in the space between the insulated guide 33 of the torch 27 and the workpiece during teaching work, thereby shortening the teaching work time. can be achieved. ,Also,
By softening the impact caused by the contact of the torch 27 with the object to be welded, it is possible to prevent the torch from splitting.

〔Effect of the invention〕

With the above configuration, the present invention prevents spatter from adhering to the base of the contact depth during welding (as shown in FIG. 4), and most of it falls downward.

On the other hand, when the shielding gas flows through that part, it also becomes a laminar flow. As a result, during welding operations, the number of times the torch needs to be cleaned is reduced by 80% compared to conventional torches. This has the effect of providing a beautiful weld bead.

[Brief explanation of drawings]

No. 11, ``2Jj'': i-center welding torch cross-sectional view, Figure 2 shows IC welding using a conventional welding torch.
This shows a situation where p sputtering is occurring. Fig. 3 is a cross-sectional view of the tip of the infiltration torch 1, which has the 4-piece varnish of the present invention, and Fig. 844 shows the tip of the welding torch of the present invention.
Figure 5 is a diagram showing the contact tip of the present invention.
131 Yo figure, No. 6 (9) is another embodiment of the present invention C] I contact chisel 7° Ii cathode a tertiary 19j, line 7 to 10 mej
Huh? A concrete example 1 of this case is shown below, which is applied to all robots. DESCRIPTION OF SYMBOLS 1...Torch main body, 2...Conditioning chimney 4-piece body, 3...Contact tube, 4...Small hole, 5...Contact wire, 6...Gas nozzle , 8...
Insulating insulator, 9.10...M hole, i, 1...i part, 12...xA'71-0 Agent Patent attorney ・硲
Figure 6 Figure 7 Figure 9 Figure 10

Claims (1)

[Claims] l. An arc welding torch has a contact tip with a predetermined pore for passing a welding wire through, and a cylindrical gas nozzle surrounding the contact tip, and the diameter near the base of the contact tip is gradually increased. Characteristic arc welding torch. 2. The arc welding torch according to claim 1, wherein the cross-sectional shape near the root of the contact depth has a substantially four-truncated conical shape. 3. The arc welding torch according to claim 1, wherein the cross-sectional line near the base of the contact tip is curved.