CN111014907A

CN111014907A - Narrow-gap filament matrix type welding gun and welding process

Info

Publication number: CN111014907A
Application number: CN201911129527.3A
Authority: CN
Inventors: 申英强; 耿正; 张翼飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-04-17

Abstract

The invention discloses a narrow-gap filament matrix type welding gun and a welding process, and aims to provide the narrow-gap filament matrix type welding gun and the welding process which are simple in structure, low in cost, high in efficiency and easy to maintain. The narrow-gap fine wire matrix type welding comprises a plurality of wire feeding pipes, a plurality of flexible conductive nozzles, gun clamps and conductive nozzle fixing heads; the gun clamp clamps and fixes a plurality of wire feeding pipes, the tail ends of the wire feeding pipes are fixed at one end of the conductive nozzle fixing head, a plurality of flexible conductive nozzles are fixed at the other end of the conductive nozzle fixing head, and the wire feeding pipes correspond to the flexible conductive nozzles one to one. In a narrow-gap filament matrix welding gun used in a welding system, a flexible contact tip is made into a bent contact tip with a corner at the tail end, so that the end of the welding wire can point to the side wall of a welding workpiece in a narrow-gap space under the condition that a straight-handle wire feeding pipe is used, the welding arc is guaranteed to point to the side wall of the welding workpiece, and the fusion of the side wall of the welding workpiece is guaranteed. The invention is applied to the technical field of welding.

Description

Narrow-gap filament matrix type welding gun and welding process

Technical Field

The invention belongs to the technical field of welding, relates to a welding gun and a welding process, and particularly relates to a narrow-gap filament matrix type welding gun and a welding process.

Background

Arc welding is one of the most important metal joining techniques, and about half of steel materials can be produced into final products through welding. How to improve the welding efficiency is an important problem in welding production. It is generally recognized that automated welding methods, such as robotic welding, can improve welding efficiency over manual welding, but have limited practical utility. This is because the essential problem of welding efficiency is also the filling efficiency of the welding wire, and the main basis for examining the welding efficiency at present is the amount of the welding wire consumed per unit time, which is also called the deposition rate of the welding wire. The adoption of multi-wire arc welding is undoubtedly an effective way to improve the deposition rate of the welding wire. At present, the multi-wire arc welding has the following methods: 1. the Tandem double-wire arc welding adopts a welding gun nozzle internally provided with two mutually insulated conductive nozzles and two cooperatively controlled welding power supplies, the welding efficiency can reach more than twice of that of single-wire welding, but the equipment is complex and the cost is high; 2. twin-wire electric arc welding, a welding gun nozzle is internally provided with a special double-hole contact tip, one welding power supply supplies power to two welding wires at the same time, the welding efficiency can also reach about twice of that of single-wire welding, but the contact tip is a non-standard product and is difficult to process and replace; 3. similar to Twin, three-wire arc welding is also adopted, a special contact tip with three holes is arranged in a nozzle of a welding gun, a welding power supply supplies power to two welding wires at the same time, the welding efficiency can also reach more than twice of that of single-wire welding, but similarly, the contact tip is a non-standard product and is difficult to process and replace. Also, the durability of the above-mentioned double-or multi-hole contact tip is much inferior to that of the conventional contact tip, and thus the multi-wire arc welding method associated therewith has not been put to practical use. Tandem twin wire arc welding has found some applications, but cannot be widely popularized due to the high cost and high maintenance requirements.

In addition, the prior art has a double-wire single power supply, a double-wire double power supply, a double-wire three power supply and four-wire submerged arc welding. For various reasons, the following problems arise:

1. the welding wire direction is fixed, can't be to the work piece that the deviation is big, and the welding seam both sides fuse often not to take place, especially in narrow groove and the welding seam in clearance, fuse and guarantee the difficulty.

2. During narrow gap or groove welding, as the side wall needs to be melted, the arc of the welding wire downwards generates the outward diffusion of the molten pool, the side wall is melted, the depth of the molten pool is enlarged in a reactive mode, and meanwhile, as the molten pool is enlarged, the energy of the arc needs to be increased, the melting and filling of the welding wire are accelerated, and the molten pool is made to be liquid surge and poor in fusion.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a narrow-gap filament matrix type welding gun and a welding process, which have the advantages of simple structure, low cost, high efficiency and easy maintenance.

The technical scheme adopted by the invention is as follows: the narrow-gap filament matrix type welding gun comprises a plurality of filament feeding pipes, a plurality of flexible conductive nozzles, a gun clamp and a conductive nozzle fixing head; the rifle presss from both sides the centre gripping and fixes a plurality of send the silk pipe, a plurality of send the end of silk pipe to be fixed the one end of contact tip fixed head, a plurality of flexible contact tip is fixed the other end of contact tip fixed head, send the silk pipe with flexible contact tip one-to-one, the welding wire is followed send silk pipe upper end to penetrate and follow send the end of silk pipe to wear out, the welding wire is followed send the end of silk pipe to get into after wearing out flexible contact tip, the end of welding wire is exposed in flexible contact tip exit.

Further, narrow clearance filament matrix welder still includes inlet tube and outlet pipe, be equipped with the water route in the contact tube fixed head, the water inlet in water route with the inlet tube is linked together, the delivery port in water route with the outlet pipe is linked together.

Furthermore, the contact tube fixing head is provided with a mounting hole matched with the flexible contact tube, the contact tube fixing head is also provided with a plurality of locking screw holes communicated with the mounting hole, each locking screw hole is screwed in one locking screw, one locking screw simultaneously fastens two flexible contact tubes on two sides, and each flexible contact tube is provided with two locking screw holes in the length direction.

Further, the flexible contact tip is a bendable metal tube.

Furthermore, the bendable metal pipe is a copper pipe.

Furthermore, the flexible conductive nozzles are arranged in a row, or in multiple rows, or in a circumferential arrangement.

Further, when the flexible contact nozzles are arranged in a row, the tail ends of all the flexible contact nozzles point to one side, or the tail ends of the flexible contact nozzles point to the left side and the right side in a crossed mode.

A welding process comprises the following steps: use in welding system narrow clearance filament matrix welder, will flexible contact tip makes the terminal crooked contact tip that has the corner, makes the welding wire can be using the straight shank under the condition of sending the wire pipe, make the directional weldment's of welding wire tip lateral wall in narrow clearance space, guarantee the directional weldment lateral wall of welding arc, guarantee the fusing of weldment lateral wall.

Further, the current profile of the welding system may be controlled by the wire feed speed of the welding wire; under the condition that the wire feeding speeds of all the welding wires are equal, the current is uniformly distributed on each welding wire; when the wire feeding speeds are unequal, the welding wires with high wire feeding speed correspond to high welding current, and the welding wires with low wire feeding speed correspond to low welding current.

The invention has the beneficial effects that: the invention adopts the design of a narrow-gap filament matrix type welding gun, and the narrow-gap filament matrix type welding gun comprises a plurality of filament feeding pipes, a plurality of flexible conductive nozzles, a gun clamp and a conductive nozzle fixing head; the rifle presss from both sides the centre gripping and fixes a plurality of send the silk pipe, a plurality of send the end of silk pipe to be fixed the one end of contact tip fixed head, a plurality of flexible contact tip is fixed the other end of contact tip fixed head, send the silk pipe with flexible contact tip one-to-one, the welding wire is followed send silk pipe upper end to penetrate and follow send the end of silk pipe to wear out, the welding wire is followed send the end of silk pipe to get into after wearing out flexible contact tip, the end of welding wire is exposed in flexible contact tip exit. Use in welding system narrow clearance filament matrix welder, will flexible contact tip makes the terminal crooked contact tip that has the corner, makes the welding wire can be using the straight shank under the condition of sending the wire pipe, make the directional weldment's of welding wire tip lateral wall in narrow clearance space, guarantee the directional weldment lateral wall of welding arc, guarantee the fusing of weldment lateral wall. Therefore, the present invention can heat and fill the local position of the welding seam, and the welding seam can be effectively controlled by utilizing the number of electric arcs. Compared with the prior single wire or multi-strand welding wire, the arc energy can be only concentrated in the range of 16mm in diameter, and by utilizing the matrix type arc process, different numbers of filaments (0.3 to 1.6mm in diameter) can be utilized to manufacture a molten bath with the length of 30 mm and the width of 10mm or the length and the width as required. The invention has the advantages of simple structure, low cost, high efficiency, easy maintenance and the like.

Drawings

FIG. 1 is a schematic view of the narrow gap filament matrix torch;

FIG. 2 is a welded perspective view;

FIG. 3 is a side view of the weld;

FIG. 4 is a top view of the weld;

fig. 5 is a schematic view of a circular arrangement of welding guns.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are provided for the purpose of visually supplementing the description with figures and detailed description, and wherein the purpose is to visually and visually enable an understanding of each and every feature and technical aspects of the present invention, but not to limit the scope of the present invention.

Example one

In this embodiment, the contact tip of the narrow gap filament matrix torch is a plurality of independent small diameter dedicated contact tips. The independent small-diameter special contact tip is made of a copper pipe with the outer diameter about 4 times of the diameter of the welding wire, and the inner diameter is plus 0.1mm of the diameter of the welding wire. For example: when a 1.0mm welding wire is used, the outer diameter of the contact tip is about 4.0 mm; the contact tip outer diameter is about 4.8mm when a 1.2mm welding wire is used. The small-diameter special contact tip is small in outer diameter and easy to bend, and the direction of a welding wire can be conveniently changed. The small-diameter special contact tip is connected without threads. And the small-diameter special conductive nozzle and the conductive nozzle seat of the welding gun are fixed by adopting an auxiliary screw. The welding wire arrangement mode of narrow clearance filament matrix welder can arrange according to welding process's demand, can single row multifilament, also can multirow multifilament, can also be the range of other modes, for example: triangular arrangement, circular arrangement, elliptical arrangement, etc., as shown in fig. 5, the welding guns are in a circular distribution. Different wire arrangements can alter the thermal profile of the welding arc.

In this embodiment, when the narrow gap filament matrix torch is used in a welding system, the welding system includes a welding power source and a wire feeder that cooperate with the contact tip.

In the present embodiment, the welding power supply may have a constant voltage characteristic or a constant current characteristic. A welding power source using a constant voltage characteristic is recommended.

In this embodiment, the wire feeder may be mechanically linked, that is, one motor drives a plurality of wire feeding wheels simultaneously; or may be a plurality of separate wire feeders. It is recommended to use a plurality of independent wire feeders. The use of multiple independent wire feeders allows control of weld formation and arc heat distribution by varying wire feed speeds.

As shown in fig. 1, there are 6 connecting

unthreaded contact tips

21, 22, 23, 24, 25, 26 corresponding to 6 feed tubes 11, 12, 13, 14, 15, 16. The 6 conductive nozzles are connected with the 6 wire feeding pipes through water-cooling conductive nozzle fixing heads 4. Each contact tube is locked through 10 locking screw holes, one locking screw is screwed into each locking screw hole, one locking screw simultaneously fastens two contact tubes on two sides, and in order to increase the locking reliability of the contact tubes, two locking screw holes are arranged in the same row.

In the present embodiment, the wire arrangement direction and the welding direction may be any angle. When the arrangement direction of the welding wires is parallel to the welding direction (0 degrees), the welding deposition rate can be increased, and the welding speed is increased; when the arrangement direction of the welding wires is vertical (90 degrees) to the welding direction, the width of the welding line can be increased, and the effect similar to strip surfacing can be obtained when the welding wires are used for surfacing; when the angle between the arrangement direction of the welding wires and the welding direction is changed between 0-90 degrees, the effect of changing the width and the penetration of the welding line can be obtained.

FIG. 1 is a detailed embodiment of a closely spaced multi-wire welding gun, in FIG. 1 a plurality of welding wires are shown in a linear arrangement, which is only one preferred embodiment of a multi-wire welding gun. The number of welding wires is not limited to 6 and can be increased or decreased; the arrangement of the welding wires is not limited to a single straight line, and may be a rectangular arrangement formed by a plurality of straight lines, a circumferential arrangement or other geometric arrangements.

The dense multi-wire arrangement has the function of changing the distribution of a single point-shaped heat source of the conventional welding arc, and different strip-shaped or planar arrangement modes can be formed to realize different welding arc heat source distributions.

Example two

A welding process comprises the following steps: use in welding system narrow clearance filament matrix welder, will flexible contact tip 2 makes the terminal crooked contact tip that has the corner, makes the welding wire can be using the straight shank send under the condition of wire tube 1, make the directional weldment's of welding wire tip lateral wall in narrow clearance space, guarantee the directional weldment lateral wall of welding arc, guarantee the fusion of weldment lateral wall.

In the present embodiment, the welding system includes a welding power source and its wire feeder that cooperate with the flexible contact tip 2.

Fig. 2 to 4 are schematic views of an embodiment of a multi-wire narrow gap weld. In FIG. 2, 10 is a narrow gap beveled workpiece; fig. 2 shows a curved contact tip 20 with a corner, which is made by utilizing the characteristic of easy bending of the small-diameter special contact tip, so that the end of the welding wire can be directed to the side wall of the welding workpiece in a narrow gap space under the condition of using a straight-shank wire feeding tube 30, thereby ensuring that the welding arc is directed to the side wall of the welding workpiece and ensuring the fusion of the side wall of the welding workpiece.

As shown in fig. 2-4, the multi-wire narrow gap welding embodiment uses at least two wires, and the contact tip 20 is actually composed of a pair of

contact tips

20A and 20B, respectively directed toward two side walls of the narrow gap bevel. To improve the welding efficiency, a multi-wire narrow gap weld can be constructed from a plurality of such sets of two-wire welds, and a scheme using 3 pairs of multi-wire narrow gap welds with curved contact tips is given in fig. 2.

As shown in fig. 2 to 4, the curved contact tip may also be directed to one side for fillet welding in a narrow space.

EXAMPLE III

In this embodiment, the current profile of the welding system may be controlled by the wire feed speed of the welding wire; under the condition that the wire feeding speeds of all the welding wires are equal, the current is uniformly distributed on each welding wire; when the wire feeding speeds are unequal, the welding wires with high wire feeding speed correspond to high welding current, and the welding wires with low wire feeding speed correspond to low welding current.

While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.

Claims

1. The utility model provides a narrow clearance filament matrix welder which characterized in that: the narrow-gap filament matrix type welding gun comprises a plurality of filament feeding pipes (1), a plurality of flexible conductive nozzles (2), a gun clamp (3) and a conductive nozzle fixing head (4); the rifle presss from both sides (3) centre gripping and fixes a plurality of the wire feeding pipe (1), a plurality of the end of wire feeding pipe (1) is fixed the one end of contact nozzle fixed head (4), a plurality of flexible contact nozzle (2) are fixed the other end of contact nozzle fixed head (4), wire feeding pipe (1) with flexible contact nozzle (2) one-to-one, the welding wire is followed wire feeding pipe (1) upper end penetrates and follows the end of wire feeding pipe (1) is worn out, the welding wire is followed the end of wire feeding pipe (1) is worn out the back and is got into flexible contact nozzle (2), the end of welding wire is exposed in flexible contact nozzle (2) exit.

2. The narrow gap filament matrix torch of claim 1 wherein: narrow clearance filament matrix welder still includes inlet tube (5) and outlet pipe (6), be equipped with the water route in contact tube fixed head (4), the water inlet in water route with inlet tube (5) are linked together, the delivery port in water route with outlet pipe (6) are linked together.

3. The narrow gap filament matrix torch of claim 1 wherein: be equipped with on contact tube fixed head (4) with the mounting hole of flexible contact tube (2) looks adaptation, contact tube fixed head (4) still be provided with a plurality of with locking screw (7) of mounting hole intercommunication, every locking screw of screw in the locking screw, one two of locking screw fastening both sides simultaneously flexible contact tube (2), each flexible contact tube (2) are equipped with two on length direction locking screw (7).

4. The narrow gap filament matrix torch of claim 1 wherein: the flexible conductive nozzle (2) is a bendable metal tube.

5. The narrow gap filament matrix torch of claim 4 wherein: the bendable metal pipe is a copper pipe.

6. The narrow gap filament matrix torch of claim 1 wherein: the flexible conductive nozzles (2) are arranged in a row, or in multiple rows, or in circumferential arrangement.

7. The narrow gap filament matrix torch of claim 6 wherein: when the flexible conductive nozzles (2) are arranged in a row, the tail ends of the flexible conductive nozzles (2) point to one side, or the tail ends of the flexible conductive nozzles (2) point to the left side and the right side in a crossed mode.

8. A bonding process using the narrow gap filament matrix torch of claim 1 wherein: use in welding system narrow clearance filament matrix welder, will flexible contact tip (2) are made the terminal crooked contact tip that has the corner, make the welding wire can be using the straight shank send under the condition of wire pipe (1), make the directional weldment's of welding wire tip lateral wall in narrow clearance space, guarantee the directional weldment lateral wall of welding arc, guarantee the fusing of weldment lateral wall.

9. The welding process of claim 8, wherein: the current profile of the welding system may be controlled by the wire feed speed of the welding wire; under the condition that the wire feeding speeds of all the welding wires are equal, the current is uniformly distributed on each welding wire; when the wire feeding speeds are unequal, the welding wires with high wire feeding speed correspond to high welding current, and the welding wires with low wire feeding speed correspond to low welding current.