JP2013039624A - Two-wire welding torch, and two-wire welding apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-wire welding torch capable of smoothly executing the two-wire welding, and a two-wire welding apparatus using the same.SOLUTION: The two-wire welding torch A7 has a wire WA located forwardly in the welding direction, and a wire holding means 2 for holding a wire WB located backwardly in the welding direction. The wire holding means 2 is capable of changing the distance L between fore ends of the wire WA and the wire WB by eccentrically turning at least any one of the wire Wa and the wire WB around the extending direction of the wires WA, WB. In this constitution, the distance L between fore ends of the wires WA, WB can be set to the value suitable for the thickness of the base material to be welded and the welding rate, and a smooth two-wire welding can be realized thereby.

Description

  The present invention relates to a two-wire welding torch for performing welding using a leading wire and a trailing wire, and a two-wire welding apparatus using the same.

  Two-wire welding using a consumable electrode wire and a filler wire is known as one method for improving the welding speed and improving the appearance of the weld bead (for example, Patent Document 1). FIG. 16 shows an example of a conventional two-wire welding apparatus. A two-wire welding torch including nozzle tips 91A and 91B is used in the two-wire welding apparatus shown in FIG. The wire WA is supplied through the nozzle tip 91A. Further, the filler wire WB is supplied to the wire WA from the rear in the welding direction through the nozzle tip 91B.

  The wire WA is connected to a welding power source (not shown). This welding power source applies a voltage between the wire WA and the welding base material P. As a result, an arc 92 from the wire WA toward the welding base material P is generated. The wire WA is fed from a supply device (not shown) at a speed corresponding to the strength of the arc 92. On the other hand, the filler wire WB is fed by a feeding device (not shown) toward the molten pool Mp generated by the arc 92. Filler wire WB is melted by the heat of molten pool Mp. As a result, the melted wire WA, filler wire WB, and weld base material P are solidified in an alloy state, whereby a weld bead Wp is formed.

  However, for example, if the distance between the wire WA and the wire WB is too large, the wire WB comes off the molten pool Mp. In such a case, the wire WB is not sufficiently melted and may be bent. When the distance between the wire WA and the wire WB is reduced, there is a problem in that the nozzle tips 91A and 91B, and portions of the two-wire welding torch holding the nozzle tips 91A and 91B interfere with each other. Thus, in the two-wire welding, it is extremely important to appropriately set the distance between the wires WA and WB according to the welding conditions such as the plate thickness of the welding base material P and the welding speed.

JP 2006-175458 A

  The present invention has been conceived under the circumstances described above, and provides a two-wire welding torch capable of smoothly performing two-wire welding and a two-wire welding apparatus using the same. Let it be an issue.

  The two-wire welding torch provided by the first aspect of the present invention is a two-wire welding torch comprising a first wire positioned in front of the welding direction and wire holding means for holding the second wire positioned in the rear of the welding direction. The wire holding means eccentrically rotates at least one of the first and second wires around a direction in which the first and second wires extend, thereby causing the first wire and the second wire to move. It is characterized in that the distance between the tips of the wires can be changed.

  According to such a configuration, the distance between the tips can be appropriately set according to the welding conditions, and two-wire welding can be performed smoothly.

  In a preferred embodiment of the present invention, the wire holding means holds the first and second wires in a relatively inclined posture so that the distance between the first and second wires decreases toward the tip. Such a configuration is advantageous for reducing the distance between the tips while suppressing interference between the portions for holding the first and second wires.

  The two-wire welding apparatus provided by the second aspect of the present invention includes a first arc between the two-wire welding torch provided by the first aspect of the present invention and at least the first wire and the welding object. A welding power source for generating According to such a configuration, two-wire welding can be performed smoothly.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a system configuration figure showing a 2 wire welding device concerning the present invention. It is sectional drawing which shows the 2 wire welding torch based on 1st Embodiment of this invention. It is sectional drawing which shows the 2 wire welding torch based on 1st Embodiment of this invention. It is a system configuration figure showing a 2 wire welding device concerning the present invention. It is a disassembled perspective view which shows the lower attachment and insulation sleeve which are used for the 2 wire welding torch based on 2nd Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 2nd Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 2nd Embodiment of this invention. It is principal part sectional drawing which shows the 2 wire welding torch based on 3rd Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 4th Embodiment of this invention. It is sectional drawing which follows the XX line of FIG. It is a principal part side view which shows the 2 wire welding torch based on 4th Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 5th Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 6th Embodiment of this invention. It is a principal part side view which shows the 2 wire welding torch based on 7th Embodiment of this invention. It is a principal part bottom view which shows the 2 wire welding torch based on 7th Embodiment of this invention. It is a principal part side view which shows an example of the conventional 2 wire welding torch.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 shows an example of a two-wire welding apparatus according to the first embodiment of the present invention. The two-wire welding apparatus B of the present embodiment includes a two-wire welding torch A1, wire feeding apparatuses AWF and BWF, a welding power source PS, a robot RB, and a robot controller RC. The two-wire welding apparatus B performs two-wire welding using the wires WA and WB.

  The two-wire welding torch A1 is attached to the robot RB and guides the wires WA and WB to the welding base material P. As shown in FIG. 2, the two-wire welding torch A <b> 1 includes a hood 1 and wire support means 2. The hood 1 has a cylindrical shape made of Cu, for example, and surrounds a part of the wire support means 2.

  The wire support means 2 holds two wires WA and WB, and includes guide pipes 20A and 20B, insulating sleeves 21A and 21B, nozzle tips 22A and 22B, a lower attachment 23, and an upper attachment 24.

  The guide pipes 20A and 20B guide the wires WA and WB sent from above toward the welding base material P downward. The nozzle tips 22A and 22B are attached to the tips of the guide pipes 20A and 20B, and the wires WA and WB are inserted therethrough.

  The insulating sleeves 21A and 21B are made of, for example, insulating resin and are fitted into the guide pipes 20A and 20B. The insulating sleeves 21 </ b> A and 21 </ b> B are formed with a portion having a larger cross-sectional diameter than the portions near both ends in the central portion in the longitudinal direction. The lower attachment 23 is made of a metal such as Cu, for example, and has a two-part structure in the depth direction of the paper. The lower attachment 23 is formed with two gaps that are shaped to fit into the insulating sleeves 21A and 21B. These gaps are inclined so that the distance from each other decreases toward the tips of the wires WA and WB. In a state where the insulating sleeves 21A and 21B are sandwiched between the above-described two divided parts, the two divided parts are coupled with, for example, bolts. The insulating sleeves 21A and 21B fitted to the lower attachment 23 are inclined so that the distance from each other becomes smaller toward the tips of the wires WA and WB. The lower attachment 23 is inserted into the hood 1 from above and is detachable from the hood 1. The upper attachment 24 holds a portion formed of an insulating material located on the upper side of the guide pipes 20A and 20B, and has, for example, a two-part structure in the depth direction of the drawing. The upper attachment 24 is formed with two gap portions into which the guide pipes 20A and 20B are fitted.

  A plurality of types of lower attachments 23 and upper attachments 24 are prepared. When a certain lower attachment 23 is selected, the inclination and distance between the guide pipes 20A and 20B are determined. The upper attachment 24 that can appropriately hold the upper portions of the guide pipes 20 </ b> A and 20 </ b> B determined thereby is selected corresponding to the lower attachment 23. In the case of the illustrated lower attachment 23 and upper attachment 24, the distance L between the tips of the wires WA and WB is about 10 mm.

  FIG. 3 shows the two-wire welding torch A1 when the lower attachment 23 and the upper attachment 24 different from those in FIG. 2 are selected. The illustrated lower attachment 23 holds the insulating sleeves 21A and 21B in a posture in which the angle formed by the insulating sleeves 21A and 21B is larger than that of the lower attachment 23 illustrated in FIG. Correspondingly, the upper attachment 24 shown in FIG. 3 holds the upper portions of the guide pipes 20A and 20B in a state of being separated from the upper attachment 24 shown in FIG. As a result, the distance L between the tips is set to about 5 mm. Thus, the wire support means 2 of the two-wire welding torch A1 can change the angle between the wires WA and WB by exchanging the lower attachment 23 and the upper attachment 24, that is, the wires WA and WB are relatively It is possible to rotate it.

  The wire feeding devices AWF and BWF are for feeding the wires WA and WB, respectively, and have a drive source such as a motor (not shown). The wire feeding devices AWF and BWF feed the wire WA and the wire WB at the feeding speeds AVf and BVf that meet the welding conditions in accordance with a command from the welding power source PS. An energization terminal CpA is provided between the wire feeder AWF and the two-wire welding torch A1. The energization terminal CpA is electrically connected to the wire WA while allowing the wire WA to pass therethrough. Similarly, an energization terminal CpB is provided between the wire feeding device BWF and the two-wire welding torch A1.

  The robot controller RC has a function of controlling the operation of the robot RB and a function of outputting arc current setting signals Ias and Ibs, arc voltage setting signals Vas and Vbs, and feed speed setting signals AWf and BWf to the welding power source PS. And have. The robot controller RC is provided with a teach pendant TP. In the teach pendant TP, the welding operator inputs the operation of the robot RB by programming and inputs the welding conditions. From these input operations and welding conditions, the robot controller RC generates arc current setting signals Ias, Ibs, arc voltage setting signals Vas, Vbs, and feed speed setting signals AWf, BWf by a preinstalled program. .

  The welding power source PS is a power source for generating arcs Aca and Acb between the wire WA or the wire WB and the welding base material P, and includes welding power source circuits APS and BPS. The welding power supply circuit APS is connected to the energization terminal CpA, and applies the voltage for generating the arc Aca from the wire WA to flow the arc current Iaw. In FIG. 1, a wire WA is used as a consumable electrode wire, and an arc Aca is generated from the wire WA. Further, the wire WB is used as a filler wire, and no arc is generated from the wire WB. On the other hand, FIG. 4 shows a welding mode in which arcs Aca and Acb are generated from both wires WA and WB. In this case, welding power supply circuit BPS applies arc voltage Ibw by applying a voltage for generating arc Acb from wire WB via energization terminal CpB. It is possible for the operator to select which of the welding forms shown in FIGS. 1 and 4 is to be input by an input operation on the teach pendant TP. According to this selection, arc current setting signals Ias and Ibs are generated. Further, feed speed setting signals AWf and BWf are sent from the welding power source PS to the wire feeding devices AWF and BWF.

  Next, the operation of the 2-wire welding torch A1 and the 2-wire welding apparatus B will be described.

  According to the present embodiment, the distance L between the tips of the wires WA and WB can be appropriately changed according to the welding conditions. In particular, the distance L between the tips can be set to about 5 mm, for example, by rotating the wires WA and WB in an inclined posture. In the setting where the distance L between the tips is small and the tips of the wires WA and WB are relatively close to each other, in the welding mode using the wire WB shown in FIG. 2 wire welding can be performed smoothly. In addition, by tilting the wires WA and WB so that the distance decreases toward the tip, interference between the components of the two-wire welding torch A1 such as the guide pipes 20A and 20B can be avoided. .

  By exchanging the lower attachment 23 and the upper attachment 24, the distance L between the tips can be arbitrarily set. The structure incorporating the lower attachment 23 and the upper attachment 24 is relatively simple although the distance L between the tips can be adjusted. Further, by fitting the lower attachment 23 and the insulating sleeves 21A and 21B, it is possible to prevent the wires WA and WB from conducting unfairly.

  5 to 15 show other embodiments of the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment. In FIGS. 6 to 9 and FIGS. 11 to 14, the hood 1 and the guide pipes 20A and 20B are omitted for the sake of understanding.

  5 to 7 show a two-wire welding torch according to a second embodiment of the present invention, and a lower attachment 23 and insulating sleeves 21A and 21B used therefor. As shown in FIG. 5, in the two-wire welding torch A2 of the present embodiment, the lower attachment 23 includes blocks 23A and 23B. Two through holes 23Aa are formed in the block 23A, and two through holes 23Ba are formed in the block 23B. The insulating sleeves 21A and 21B are provided with two protrusions 21Aa and 21Ba that protrude in opposite directions at the center in the longitudinal direction. The insulating sleeves 21A and 21B are attached to the lower attachment 23 with the protrusions 21Aa and 21Ba being inserted into the through holes 23Aa and 23Ba. Thereby, the insulating sleeves 21 </ b> A and 21 </ b> B are rotatable with respect to the lower attachment 23.

  As shown in FIGS. 6 and 7, the two-wire welding torch A <b> 2 can adjust the distance L between the tips by changing the angles of the insulating sleeves 21 </ b> A and 21 </ b> B with respect to the lower attachment 23. The upper attachment 24 holds the wires WA and WB. As the upper attachment 24, a plurality of types capable of holding the wires WA and WB at a fixed interval are prepared, and may be appropriately replaced according to the distance L between the tips, or the wires WA and WB may be replaced at an arbitrary interval. The structure which can be fixed may be sufficient.

  Even in such an embodiment, the distance L between the tips can be set freely, and two-wire welding can be performed smoothly. By making the insulating sleeves 21 </ b> A and 21 </ b> B rotatable with respect to the lower attachment 23, the distance L between the tips can be continuously changed.

  FIG. 8 shows a two-wire welding torch according to a third embodiment of the present invention. The two-wire welding torch A3 of the present embodiment is different from the above-described embodiment in the support structure of the insulating sleeves 21A and 21B with respect to the lower attachment 23. In the present embodiment, male screws 21Ab and 21Bb are formed on the insulating sleeves 21A and 21B. On the other hand, the lower attachment 23 is formed with two female screws 23a screwed with male screws 21Ab and 21Bb. The insulating sleeves 21A and 21B are provided with grips 21Aa and 21Ba. The insulating sleeves 21A and 21B are rotated with respect to the lower attachment 23 by rotating the insulating sleeves 21A and 21B while gripping these grips 21Aa and 21Ba. Can be moved forward and backward. Even with such a configuration, the distance L between the tips can be continuously changed, and two-wire welding can be performed smoothly.

  9 to 11 show a two-wire welding torch according to a fourth embodiment of the present invention. The two-wire welding torch A4 of the present embodiment is configured to translate the wires WA and WB relative to each other by exchanging the lower attachment 23 and the upper attachment 24, respectively. As shown in FIG. 10, the lower attachment 23 has a shape similar to a spanner, including two fitting portions 23 b and a connecting portion 23 c that connects them. The fitting portion 23b is C-shaped and is fitted to the insulating sleeves 21A and 21B. Similarly, the upper attachment 24 has a shape similar to a spanner having two fitting portions 24b and a connecting portion 24c for connecting them. In the present embodiment, the distance L between the tips can be set to an arbitrary size by appropriately selecting from a plurality of types of lower attachments 23 and upper attachments 24 having different dimensions.

  FIG. 12 shows a two-wire welding torch according to a fifth embodiment of the present invention. In the two-wire welding torch A5 of the present embodiment, the wire holding means 2 is configured to have an adjustment rod 26 and support blocks 25A and 25B, and is configured to translate the wires WA and WB relative to each other. The support blocks 25A and 25B are attached to the insulating sleeves 21A and 21B, and female threads facing the welding direction are formed. The adjustment rod 26 includes a grip 26a and a rod 26b. The rod 26b is formed with a male screw and is screwed with the female screw of the support blocks 25A and 25B. By rotating the grip 26a, the wires WA and WB move in translation with respect to each other. Also with such a configuration, the distance L between the tips can be changed, and two-wire welding can be performed smoothly.

  FIG. 13 shows a two-wire welding torch according to a sixth embodiment of the present invention. In the two-wire welding torch A6 of the present embodiment, the wire holding means 2 includes the lower attachment 23 and the insulating sleeves 21A and 21B, the adjusting rod 26 as the inter-wire distance adjusting means, and the support block. 25A, 25B. In the present embodiment, the wires WA and WB can be relatively rotated by rotating the adjustment rod 26. The tip-to-tip distance L can be adjusted also with such a configuration.

  14 and 15 show a two-wire welding torch according to a seventh embodiment of the present invention. In the two-wire welding torch A7 of the present embodiment, the wire holding means 2 has a support block 25 and a swing rod 27. The swing rod 27 is bent at a right angle, one end is rotatably supported by the support block 25, and an insulating sleeve 21B is attached to the other end. The support block 25 supports the wire WA but does not support the wire WB. As shown in FIG. 15, when the swing rod 27 is swung with respect to the support block 25, the distance L between the tips can be continuously changed. In the present embodiment, the direction of connecting the tips of the wires WA and WB changes depending on the swing of the swing rod 27. Two-wire welding is performed by matching the direction in which the tips are connected to the welding direction.

  The two-wire welding torch and the two-wire welding apparatus using the same according to the present invention are not limited to the above-described embodiments. The specific configuration of each part of the two-wire welding torch according to the present invention and the two-wire welding apparatus using the torch can be varied in design in various ways.

A1, A2, A2, A4, A5, A6, A7 2-wire welding torch APS, BPS Welding power supply circuit AWF, BWF Wire feeding device AWf, BWf Feeding speed setting signal CpA, CpB Energizing terminals Ias, Ibs Arc current setting Signal Iaw, Ibw Arc current Mp Weld pool P Welding base material (Welding object)
PS welding power source RB robot RC robot controller TP teach pendant Vas, Vbs arc voltage setting signal WA (first) wire WB (second) wire Wp welding bead 1 hood 2 wire support means 21A (first) insulating sleeve 21B (second) ) Insulation sleeve 21Aa, 21Ba Protrusion 22A, 22B Nozzle tip 23 Lower attachment (first attachment)
23a Through-hole 23b Fitting part 23c Connecting part 24 Upper attachment (second attachment)
24b Fitting part 24c Connecting part 25 Support block 25A Support block (first block)
25B Support block (second block)
26 Adjustment rod 26a Grip 26b Rod 27 Swing rod

Claims (3)

A two-wire welding torch comprising wire holding means for holding a first wire located in front of the welding direction and a second wire located in the rear of the welding direction,
The wire holding means eccentrically rotates at least one of the first and second wires around the direction in which the first and second wires extend, thereby causing the tips of the first wire and the second wire to move. A two-wire welding torch, characterized in that the distance between the two can be changed.   2. The two-wire welding torch according to claim 1, wherein the wire holding means holds the first and second wires in a relatively inclined posture so that a distance between the first wire and the second wire decreases toward the tip. . The two-wire welding torch according to claim 1 or 2,
A two-wire welding apparatus comprising: a welding power source that generates at least a first arc between the first wire and an object to be welded.

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