JPH08132240A - Consumble electrode type welding torch - Google Patents

Abstract

PURPOSE: To easily adjust the oscillation width even when the weld gap is fluctuted in a consumable electrode type welding torch to be applied to the arc welding of various structures. CONSTITUTION: A wire feeding nozzle 14 is fitted to a torch base part through a spring 13, and a tip 4 and the wire 5 are held at the tip. When the alternating voltage is applied to electromagnetic coils 16a, 16b by an alternating voltage generating device 19, the nozzle 14 is oscillated in a welding torch 3 by the attraction and the repulsion of the permanent magnets 15a, 15b, and the tip of the wire is oscillated to achieve the welding. When the voltage is applied to piezoelectric elements 33a, 33b fixed to hinge mechanisms 31a, 31b by a DC voltage generating device 30, the hinge mechanisms are elastically deformed, the distance between the end parts is changed, the oscillation of the nozzle 14 is limited and the movement of the oscillation width W is limited to appropriately adjust W.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a boiler, a ship, a bridge,
The present invention relates to a consumable electrode type welding torch for arc welding applied to welding of steel frames.

[0002]

2. Description of the Related Art A conventional consumable electrode type welding torch is disclosed in Japanese Utility Model Laid-Open No. 05-076669, the contents of which will be described with reference to FIGS. 5 is a configuration diagram of a conventional consumable electrode type welding torch, FIG. 6 is a configuration diagram of horizontal fillet welding by the conventional welding torch, and FIG. 7 is a cross-sectional view of a fillet welding bead by the conventional welding torch.

In FIGS. 5 and 6, 1 is a base metal, 2 is a welding power source, 3 is a welding torch, 4 is a welding tip at the tip of the torch 4, 5 is a wire, 6 is an arc generated during welding, and 7 is power. Cable, 8 is a power supply nozzle for supplying the welding power source 2,
9 is a shield gas supply nozzle, 10 is a torch base, 11
Is a mounting bolt for holding and mounting the power cable 7, 12 is a support arm to which the bolt 11 is coupled, 13
Is a spring, 14 is a wire supply nozzle supported in the welding torch 3 by the spring 13, 15a, 15b are permanent magnets attached to the wire supply nozzle 14, 16a, 1
6b is an electromagnetic coil, 17 is an iron core of the electromagnetic coils 16a and 16b, 18 is an oscillating width adjusting screw, and 19 is an alternating voltage generator for exciting the electromagnetic coils 16a and 16b.

In FIG. 7, reference numeral 20 in FIG. 7A indicates a horizontal fillet weld bead when there is no gap in the welded portion of the base material 1, and reference numeral 21 in FIG. 7B indicates a gap 22 in the welded portion of the base material 1. ,
Horizontal fillet weld bead when sound welding is not possible.

Next, the operation of the conventional device having such a configuration will be described. In the conventional welding torch shown in FIG. 5, alternating voltage is supplied from the alternating voltage generator 19 to the electromagnetic coils 16a, 16a.
When applied to b, an attractive force and a reaction force are simultaneously generated between the electromagnetic coils 16a and 16b and the permanent magnets 15a and 15b depending on the polarity of the alternating voltage. Using this force as a drive source, the wire supply nozzle 14 swings around the mounting portion of the spring 13, and the tip of the wire 5 at that end also swings.

Next, the operation when this conventional welding torch is applied to horizontal fillet welding will be described. In horizontal fillet welding, the wire is oscillated in the welding line direction in order to secure the leg length of the welding bead 20 shown in FIG. 7. In FIG. 6, first,
When the welding power source 2 is turned “ON”, the tip of the wire 5 and the base material 1
The arc 6 is generated during this period, and the welding power source 2 is adjusted so that a predetermined welding voltage and current are obtained. When the welding situation is stable,
Next, by the alternating voltage generator 19, the electromagnetic coils 16a, 1
6b is excited to oscillate the tip of the welding wire 5 in the welding line direction. Further, the welding bead 20 is obtained by moving the welding torch 3 by a robot or a carriage (not shown) connected to the welding line direction support arm 12.

However, as shown in FIG. 7, the welded portion of the base material 1 is a corner formed by two plates, and the welded portion is formed on the welded portion depending on the base material cutting accuracy before welding or the dimensional accuracy of temporary welding. As shown in FIG. 7 (b), a gap 22 is generated, and depending on the size of the gap 22, a sound weld bead cannot be obtained, and there is a possibility that an undercut or a defective bead 21 having an insufficient throat thickness may occur. In particular, when the size of the gap of the welded portion varies, it is necessary to adjust the oscillating width of the tip of the wire 5 according to the size of the gap without stopping the welding.

In the conventional consumable electrode welding torch, the oscillating width of the tip of the wire 5 can be adjusted to a semi-fixed type by the oscillating width adjusting screw 18 as shown in FIG. It is impossible to adjust the oscillating width of the wire tip according to the size of the wire.

[0009]

In horizontal fillet welding, as described above, the welded portion is a corner portion composed of two plates, and when a gap occurs due to dimensional accuracy and the gap width changes. In order to obtain a sound weld bead, it is necessary to adjust the oscillating width of the wire tip according to the size of the gap without stopping the welding.

In the conventional consumable electrode type welding torch, the oscillating width of the wire tip can be adjusted to a semi-fixed type by the oscillating width adjusting screw 18. However, while welding, the oscillating width of the wire tip can be adjusted according to the size of the gap of the welding portion. It is impossible to adjust the oscillation width. Therefore, depending on the size of the gap, defective beads may be generated.

Further, when a defective bead is generated,
It is necessary to rework the location, which further increases the welding work, leading to a reduction in the efficiency of the welding work.

[0012]

In order to solve the above problems, the present invention is directed to a consumable electrode type welding torch that oscillates the tip of a welding wire and is attached to the base of the torch via a flexible member. A configuration is provided in which a pair of deformable hinge mechanisms provided near the opposite side surfaces of the swinging wire supply nozzle and a piezoelectric element fixed to the hinge mechanism are provided.

That is, according to the present invention, the wire supply nozzle is attached to the tip of the torch base through a flexible member, and the tip holding the wire is attached to the tip, and the opposite side surface of the wire supply nozzle. A pair of permanent magnets fixed to the same, and a pair of electromagnetic coils that are close to the outside of the permanent magnet and that are opposed to each other so that their central axes coincide with each other and are perpendicular to the polar surface of the permanent magnet. When an alternating voltage is applied to the pair of electromagnetic coils, an attractive force is generated on one side and a reaction force is generated on the other side at the same time between the electromagnetic coils and the permanent magnets, whereby the wire is centered around the flexible member. In a consumable electrode type welding torch that oscillates the tip of the wire held by the tip of the supply nozzle, a pair is disposed in proximity to the opposing side surfaces of the wire supply nozzle,
A hinge mechanism elastically deformable in the direction of oscillating the wire, and a pair of piezoelectric elements fixed to the respective hinge mechanisms, and elastically deforming the hinge mechanism by a voltage applied to the piezoelectric element, There is provided a consumable electrode type welding torch characterized by adjusting the oscillating width of the wire tip.

[0014]

According to the present invention, when the welding power source is driven by such means to generate an arc between the wire and the base metal and an alternating voltage is applied to the electromagnetic coil, one of the two is generated between the electromagnetic coil and the permanent magnet. At the same time, an attractive force is generated during the period and a reaction force is generated during the other period, and the action causes the wire supply nozzle attached to the flexible member to swing. This swing causes the wire at the tip to oscillate and weld, but if a DC voltage is applied to the piezoelectric element at this time, the deformation of the piezoelectric element elastically deforms the hinge mechanism, causing a change between the ends of the pair of hinges. To do. The swing of the wire supply nozzle moves within the range close to the electromagnetic coil in the welding torch, but the swing range is determined by the gap at the hinge end.Therefore, the voltage value of the piezoelectric element causes the wire at the tip of the wire supply nozzle to move. It is possible to control the oscillating width of.

Further, if the gap between the base materials of the welded portion is detected by a sensor or the like and the applied voltage of the piezoelectric element is controlled so as to obtain an oscillating width suitable for the gap, even if the welding gap changes, The oscillating width can be properly controlled without stopping the welding.

By adjusting the oscillating width in this way, a good welding bead can be obtained even when the gap amount changes, and the number of welding defects is reduced, so that the welding work can be greatly rationalized without any repair work. It is a thing.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a configuration diagram of a consumable electrode type welding torch according to an embodiment of the present invention, FIG. 2 is a detailed side view of a partially enlarged view of FIG. 1, FIG. 3 is a wire tip oscillating characteristic curve, and FIG.
FIG. 4 is a bead cross-sectional view showing a case where there is a gap in a welded portion when horizontal fillet welding is performed using the consumable electrode type welding torch of the present embodiment.

In FIGS. 1 and 2, reference numerals 1 to 17 and 19 are the same as those of the conventional device described in FIGS. 5 and 6, so detailed description thereof will be omitted and the description will be given as it is. Characteristic portions are portions 30 to 34, and these characteristics will be described in detail below.

In the figure, 30 is a DC voltage generator, 3
Reference numerals 1a and 31b denote a pair of hinge mechanisms attached to the welding torch 3, and wavy lines 32a and 32b indicate the hinge mechanism 3.
1a and 31b are elastically deformed and a hinge mechanism showing a moved shape, and 33a and 33b are piezoelectric elements attached to the hinge mechanisms 31a and 31b, and a direct current voltage is applied by the direct current voltage generator 30. Mechanisms 31a, 31
By moving and deforming b, the shape shown in 32a and 32b is obtained. Therefore, this hinge mechanism 31a,
31b is made of a material having elasticity. Except for the screw 18, the other structure is the same as the conventional structure shown in FIGS. 5 and 6, and the description thereof is omitted.

Next, the operation of the consumable electrode type welding torch having such a structure will be described. First, as in the conventional case, the welding power source is turned “ON”, an arc 6 is generated between the tip of the wire 5 and the base material 1, and the welding power source is adjusted so as to obtain a predetermined welding voltage and current. When the welding condition becomes stable, next, the alternating voltage generator 19 causes the electromagnetic coils 16a, 1
6b is excited to move the wire supply nozzle 14 to the spring 13
Is swung around, and the tip of the welding wire 5 is oscillated in the welding line direction. Further, the welding torch 3 is moved by a robot (not shown), a carriage, or the like to obtain a welding bead. Up to this state, the operation is the same as that of the conventional example.

Further, in the present invention, after the tip of the wire 5 is oscillated, a predetermined DC voltage is input to the piezoelectric elements 33a and 33b from the DC generator 30. As a result, the piezoelectric elements 33a and 33b are deformed, and as a result, the hinge mechanism is deformed within the elastic range like the wavy lines 32a and 32b shown in FIG. That is, since the wire supply nozzle 14 is swung about the spring 13 as described above, the swing width of the wire supply nozzle 14 is limited by the deformation amount of the hinge mechanisms 31a and 31b. Become. Further, since the deformation amounts of the hinge mechanisms 31a and 31b can be adjusted by the voltage from the DC generator 30, the voltage value from the DC generator 30 results in the wire 5 at the tip of the wire supply nozzle 14. It is possible to control the oscillating width W of the tip.

FIG. 3 shows the DC element 30 to the piezoelectric element 33.
3 is a characteristic curve showing the relationship between the voltage input to a and 33b and the oscillation width of the tip of the wire 5. In the embodiment of the present invention, the wire tip oscillating width is set to 10 mm as shown in the figure.
It can be adjusted from 0 to 0 by the input voltage from the DC generator 30.

Further, in horizontal fillet welding using the consumable electrode type welding torch of the embodiment of the present invention, although not shown, the gap amount of the welded portion is previously detected by a sensor or the like, and during welding, Even if the gap fluctuates, if the controller calculates according to the characteristic shown in FIG. 3 according to the fluctuation and the DC voltage from the DC voltage generator 30 is adjusted, the welding work can be performed without stopping. Since the oscillating width at the tip of the wire 5 can be automatically and properly adjusted and set, a good weld bead 34 without defects as shown in FIG. 4 can be obtained.

[0024]

As described in detail below, in the present invention, in the consumable electrode type welding torch for oscillating the tip of the welding wire, the wire which is attached to the base of the torch through the flexible member and swings. Since the pair of deformable hinge mechanisms provided near the opposite side surfaces of the supply nozzle and the piezoelectric element fixed to the hinge mechanism are provided, the following effects can be obtained. (1) When applied to horizontal fillet welding, the oscillating width can be properly controlled even in a welding portion where a gap is generated in the welded portion and the gap amount fluctuates, so that good welding can be performed without stopping the welding. You can get a bead. Therefore, unlike the conventional case, welding defects do not occur, so that reworking work is not required and a great rationalization is possible. (2) Further, conventionally, it was difficult to adjust the welding oscillating width with a semi-fixed type because the base material cutting accuracy or welding tacking work accuracy was required so as to avoid gaps as much as possible. Since the oscillating width can be easily adjusted, such work before welding can be reduced, which further improves the work efficiency.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a consumable electrode type welding torch according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the welding torch in FIG.

FIG. 3 is a characteristic curve of a wire tip oscillating width of a consumable electrode type welding torch according to an embodiment of the present invention.

FIG. 4 is a bead cross section when a consumable electrode type welding torch according to an embodiment of the present invention is applied to horizontal fillet welding and has a gap.

FIG. 5 is a configuration diagram of a conventional consumable electrode type welding torch.

FIG. 6 shows a configuration of horizontal fillet welding using a conventional welding torch.

FIG. 7 is a cross-sectional view of a fillet weld bead using a conventional welding torch, (a) showing a state where there is no gap in the base metal, (b)
Shows the state when there is a gap in the base material.

[Explanation of symbols]

 3 Welding torch 4 Chip 5 Wire 10 Torch base 13 Spring 14 Wire supply nozzle 15a, 15b Permanent magnet 16a, 16b Electromagnetic coil 17 Iron core 19 Alternating voltage generator 30 DC generator 31a, 31b Hinge mechanism 33a, 33b Piezoelectric element 34 Weld bead

Claims (1)

[Claims] 1. A wire feed nozzle, which is attached to the tip of a torch base through a flexible member, and a tip holding a wire is attached to the tip, and is fixed to the opposite side surface of the wire feed nozzle. A pair of permanent magnets, a pair of electromagnetic coils that are close to the outside of the permanent magnets, have their central axes aligned with each other, and are opposed to each other so as to be perpendicular to the polar surface of the permanent magnets, and the same pair of electromagnetic coils When an alternating voltage is applied to the electromagnetic coils and one of the permanent magnets, one attracts and the other reacts simultaneously, which causes the tip of the wire feed nozzle to center on the flexible member. In a consumable electrode type welding torch that oscillates the tip of a held wire, a pair is disposed close to the opposite side surfaces of the wire supply nozzle, and a wire is oscillated in the oscillating direction of the wire. And a pair of piezoelectric elements fixed to the respective hinge mechanisms. The hinge mechanism is elastically deformed by the voltage applied to the piezoelectric elements, and the oscillating width of the wire tip is adjusted. A consumable electrode type welding torch characterized by adjustment.