JPH0522381Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a consumable electrode type welding torch that is applied to consumable electrode type arc welding that generates multiple parallel arcs.

[Conventional technology]

Conventionally, a welding torch applied to consumable electrode type arc welding that generates multiple parallel arcs will be explained with reference to a front view of the chip in Fig. 7, a longitudinal sectional view in Fig. 8, and a perspective view in use in Fig. 9. wire 10
is fed from a wire reel 13 by a feed motor 11 and a feed roller 12 into a hole drilled in a tip 7 attached to the tip of a welding torch 3, and is fed into a single welding power source equipped with a regulator 14. 1 to the workpiece 18 and the welding torch 3 through the power cable 2, the current flows through the terminal plate 17,
It is supplied to three wires 10 through the center cylinder 6, cap nut 8 and tip 7, and each wire 10
An arc 19 is generated from the tip toward the workpiece 18 . At the same time, a shielding gas 16 is supplied through the shielding gas introduction pipe 15, the insulator pipe 4, and the shielding gas nozzle 5, and the molten metal melted by the arc 19 is protected from oxidation. In this state, if the welding torch 3 is moved by a moving means (not shown), highly efficient welding becomes possible.

However, in such a one-chip multiple arc method using a single welding power source 1, in order to simultaneously melt a plurality of wires 10, a welding power source 1 that can supply a high current in proportion to the number of wires 10 is required. Moreover, since electromagnetic force acts between the plurality of arcs 19 and the amount of spatter increases, the amount of spatter attached to the chip 7 is large.

Furthermore, if a one-chip, multiple-arc method is adopted in which power is supplied from the same number of welding power supplies 1 to a plurality of wires 10 and a plurality of arcs 19 are generated, each wire 10 is insulated within the welding torch 3, and the chip 7
Also, insulation between the wires 10 must be ensured.

[Problem that the invention aims to solve]

The present invention was proposed in view of these circumstances, and it prevents spatter from adhering to the chip, and even if the tip of the chip wears out, it is only necessary to replace the wire passage tube made of a good conductor, and it also reduces the tightening work after replacement. The present invention is characterized by providing a consumable electrode type welding torch which is easy to use, can obtain a large heat source with an appropriate heat source distribution, and can achieve high-speed welding without defective beads.

[Means for solving problems]

To this end, the present invention includes a plurality of conduit cable mounting brackets provided at the base end of the torch to which a plurality of wire feeding conduit cables are connected, and a plurality of conduit cable mounting brackets attached to each of the conduit cable mounting brackets. A plurality of terminal plates to which power cables from welding power sources are connected, a shield gas nozzle extending from the base end of the torch to the tip, a central cylinder inserted on the axis of the shield gas nozzle, and its a tip connected to the tip via a cap nut, and each of the center tube and the tip is composed of a plurality of wire passage tubes made of a good conductor and an insulating material surrounding and covering the tubes; A reinforcing ring is interposed between the outer circumference of the tip and the inner circumference of the cap nut.

[Effect]

With the above-described configuration, the welding torch of the present invention can generate the same number of arcs from a plurality of welding power sources with one torch. Furthermore, since the tip is insulating coated with a reinforcing ring, the rigidity of the tip is increased, and the amount of spatter generated due to the electromagnetic force between arcs due to the effect of multiple power sources is reduced, resulting in a good weld bead.

〔Example〕

An embodiment of the present invention applied to a consumable electrode type welding torch that performs gas shielded arc welding by feeding three wires and supplying power from three welding power sources is shown in Fig. 1. The side view, Fig. 2, and Fig. 3 are - and - of Fig. 1, respectively.
4 is a front view of the chip, FIG. 5 is a longitudinal sectional view taken along line 4, and FIG. 6 is a perspective view showing the welding torch in use.

In the above figure, reference numeral 1 indicates three welding power sources, each of which is provided with a current or voltage regulator 14.
Reference numeral 2 denotes power cables led out from three welding power sources 1, which are attached to three conduit cables 9 fittings 9' provided at the base end of the torch 3 via terminal plates 17, respectively. There is. The conduit cable 9 is a cable that leads the wire 10 to the torch 3.

The torch 3 has a shield gas nozzle 5 attached through an insulating pipe 4 and extending toward the tip of the torch.
, a central cylinder 6 inserted on the axis thereof, and an insulator-covered chip 7' connected to the central cylinder 6 via a cap nut 8.

Three wire passing tubes 23 made of a good conductor, through which three wires 10 pass, are installed through the center cylinder 6, and an insulating material 24 is coated around them.
In addition, the insulator-coated chip 7' is a wire passage tube made of a good conductor, in which wire passage holes are bored at approximately equal intervals on the same circumference in the center thereof, parallel to or at an angle to the axis. 23 are disposed, their surroundings are covered with an insulator 24, and a reinforcing ring 25 is further fitted around the outer circumference of the ring, particularly at the portion to be tightened with the cap nut 8.

Further, at the upper end of the torch 3, a conduit cable 9 is attached to three conduit cable fittings 9', and three wires 10 wound around a wire reel 13 are connected to a roller 12 driven by a motor 11. are individually guided to the torch 3 through the central tube 6 to three of the insulator-coated chips 7'.
The wire passing tubes 23 made of a good conductor are respectively fed.

On the other hand, the power from each welding power source 1 is supplied to the wire passage tube 23 made of a good conductor of the insulator-coated chip 7 via each terminal plate 17 and the center cylinder 6, and the electric power is supplied to the wire passage tube 23 made of a good conductor of the insulator-coated chip 7, and the tip of each wire 10 and the workpiece 18 are connected to each other. During this period, three arcs 19 are generated, and the shielding gas 16 is fed from the shielding gas introduction pipe 15 to the shielding gas nozzle 5 to perform shielding gas welding.

Since the wire passage tubes 23 made of a good conductor of the insulator-coated chip 7' are provided at approximately equal intervals on approximately the same circumference, the three arcs 19 are generated at equal intervals on the workpiece. , and wire passage tube 2
3, the three arcs 19 are considered as a large single arc.

In this way, when welding is performed by supplying power from the same number of welding power sources 1 as the number of 10 wires, welding can be performed with multiple arcs so close that they are considered as a single arc, and each arc 19 is connected to each welding power source 1. Since the current or voltage can be finely adjusted for each wire 10 using the regulator 14 attached to the wire, for example, 1,
Irregular beads or undercut beads do not occur even during high-speed welding at 8 m/min. Furthermore, compared to a single-chip, multiple-arc system using a single power source, the attraction force due to the electromagnetic force between the arcs 19 is reduced, so the amount of spatter generated is also reduced.

A cooling water circulation pipe 20 and a metal fitting 20' are attached to guide cooling water from the outside. Furthermore, if the torch 3 is moved using the torch fixing jig 26 by a moving means (not shown), highly efficient welding becomes possible.

Such a device provides the following effects.

(1) Since the chip 7' is coated with an insulating material, it is difficult for spatter from welding to adhere to the chip 7'.
Even if spatter accumulates between the chip 7' and the shield gas nozzle 5, no arc is generated from the shield gas nozzle 5.

(2) If the sliding surface with the wire 10, especially the tip end, becomes worn, only the wire passage tube 23 made of a good conductor needs to be replaced, and since the reinforcing ring 25 is fitted around the outer periphery of the insulator 24, There is no need to be nervous about tightening with the cap nut 8.

(3) Since power is supplied to the three wires 10 from individual welding power sources 1, a large heat source can be obtained with appropriate heat source distribution, and high-speed welding can be achieved without generating defective beads such as undercuts. Is possible.

[Effects of the invention] In short, according to the invention, a plurality of conduit cable mounting brackets are provided at the proximal end of the torch, and each of the plurality of wire feeding conduit cables is connected to the conduit cable mounting brackets. A plurality of terminal plates are attached to each one and connected to power cables from a plurality of welding power sources, a shield gas nozzle extends from the base end of the torch to the tip, and the shield gas nozzle is inserted on the axis of the torch. a central cylinder and a chip connected to its tip via a cap nut, and each of the central cylinder and the chip is made of a plurality of wire passing tubes made of a good conductor and an insulating material surrounding and covering the tubes. In addition to this structure, a reinforcing ring is interposed between the outer periphery of the tip and the inner periphery of the cap nut, making it difficult for spatter to adhere to the tip.
Even in the case of chip tip wear, it is only necessary to replace the wire passage tube made of a good conductor, and the tightening work after replacement is easy, and a large heat source can be obtained with an appropriate heat source distribution, allowing high-speed welding without defective beads. The present invention is industrially extremely useful because it provides a consumable electrode type welding torch that can achieve the following.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the consumable electrode type welding torch of the present invention, and Figs.
Fig. 4 is a front view of the same chip as above, Fig. 5 is a vertical sectional view taken along - in Fig. 4, and Fig. 6 is a perspective view showing the welding torch in use. . FIG. 7 is a front view of a tip of a conventional consumable electrode type welding torch, FIG. 8 is a longitudinal sectional view taken along the line - in FIG. 7, and FIG. 9 is a perspective view showing the welding torch in use. 1...Welding power source, 2...Power cable, 3...
Torch, 5... Shield gas nozzle, 6... Center cylinder, 7'... Insulator coated tip, 8... Cap nut,
9... Conduit cable, 9'... Conduit cable mounting bracket, 10... Wire, 17... Terminal plate, 23... Good conductor wire passage tube,
24... Insulator, 25... Reinforcement ring.

Claims (1)

[Scope of utility model registration request] A plurality of conduit cable mounting brackets are provided at the base end of the torch and each of the wire feeding conduit cables is connected to the other, and a power cable from a plurality of welding power sources is attached to each of the conduit cable mounting brackets. are connected to each other, a shield gas nozzle extending from the proximal end of the torch toward the tip, a central cylinder inserted on the axis of the shield gas nozzle, and a cap nut attached to the tip of the shield gas nozzle. the central cylinder and the chip are each composed of a plurality of wire passing tubes made of a good conductor and an insulating material surrounding and covering the tubes, and the outer periphery of the tip and the cap nut A consumable electrode type welding torch characterized by a reinforcing ring interposed between the inner circumference and the inner circumference.