A lateral conductive device and method for multi-wire submerged arc internal / external welding of straight seam steel pipes

Abstract

The present invention relates to a lateral conductive device and method for multi-wire submerged arc internal / external welding of straight seam steel pipes. The device aims to overcome the problems of poor electromagnetic field closure and welding instability caused by bending deformation of the steel pipe during welding caused by existing negative electrode conductive mechanisms. The device comprises: a floating surface contact conductive device capable of forming surface contact with the outer surface of the straight seam steel pipe; a lateral conductive brush device comprising a plurality of conductive brushes electrically connected to the floating surface contact conductive device; a lateral conductive metal plate electrically connected to the negative electrode handle of the welding machine; and the conductive brushes of the lateral conductive brush device electrically connected to the lateral conductive metal plate. This allows the negative electrode handle, the lateral conductive metal plate, the lateral conductive brush device, the floating surface contact conductive device, the straight seam steel pipe, and the welding wire electrode to form a conductive circuit.

Description

Technical Field

[0001] The invention relates to a conductive device and method for submerged arc welding of straight seam steel pipes. Background Art

[0002] Straight seam steel pipe is currently the mainstay of pipeline applications. It offers advantages such as minimal welding effort, fewer weld defects, and greater suitability for the production of thick-walled steel pipes. Straight seam internal and external welding are key processes for ensuring the quality of straight seam steel pipe welding. These welds represent the final service welds, and their quality directly impacts the safety and reliability of pipeline service.

[0003] In the field of straight seam steel pipe internal and external welding, the existing negative electrode conductive mechanism is an external cross-type working machine with a pneumatic lifting conductive brush device. The negative pole of the power supply is connected to the conductive plate of the conductive brush holder, and the conductive brush contacts the pipe body to form a circuit. This method has two problems:

[0004] First, in the existing conductive mechanism, the two sets of conductive brushes are separated by a certain distance. During the welding process, only one set of conductive brushes is in contact with the steel pipe at the starting welding end and the arc-extinguishing welding end. This may cause problems with the electromagnetic field closure and affect the welding quality of the steel pipe end.

[0005] 2. When welding small-diameter steel pipes, the steel pipes will be axially bent and deformed due to welding stress during the welding process, causing torque to be generated at the fulcrum where the two sets of conductive brushes contact the small-diameter steel pipes. In severe cases, it can cause the entire frame to vibrate, affecting the stability of the welding process. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problem of poor electromagnetic field closure caused by the existing negative electrode conductive mechanism and the problem of unstable welding process caused by bending deformation during steel pipe welding, and to provide a lateral conductive device and method for multi-wire submerged arc internal / external welding of straight seam steel pipes.

[0007] The present invention provides a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes, comprising a supporting device, a floating surface contact conductive device, a lateral conductive brush device and a lateral conductive metal plate;

[0008] A supporting device for supporting the straight seam steel pipe;

[0009] The floating surface contact conductive device can form surface contact with the outer surface of the straight seam steel pipe and electrically connect;

[0010] The lateral conductive brush device is located on one side of the supporting device, and the lateral conductive brush device includes a plurality of conductive brushes; and the lateral conductive brush device is electrically connected to the floating surface contact conductive device;

[0011] The lateral conductive metal plate is located on one side of the lateral conductive brush device, and the lateral conductive metal plate is electrically connected to the negative electrode wire of the welding machine;

[0012] The conductive brush of the lateral conductive brush device can move to the surface of the lateral conductive metal plate and be electrically connected to the lateral conductive metal plate; so that the negative electrode wire, the lateral conductive metal plate, the lateral conductive brush device, the floating surface contact conductive device, the straight seam steel pipe and the welding wire electrode used for multi-wire submerged arc internal / external welding of the straight seam steel pipe form a conductive circuit.

[0013] The present invention also provides a lateral conductive method for multi-wire submerged arc internal / external welding of straight seam steel pipes, based on a lateral conductive device, and the specific steps are as follows:

[0014] Step 1: The steel pipe detection device detects whether there is a straight seam steel pipe on the support device. If so, proceed to step 2;

[0015] Step 2: The floating surface contact conductive device is lifted, and the conductive floating block forms surface contact with the outer wall of the straight seam steel pipe;

[0016] Step 3: The conductive brush of the lateral conductive brush device extends out to contact the lateral conductive metal plate.

[0017] The beneficial effects of the present invention are:

[0018] The present invention proposes a new conductive structure and method, so that the electromagnetic field is always in a good and stable closed state during the welding process, thereby stabilizing the multi-arc welding process and improving the welding quality; and when welding small-diameter steel pipes, the original conductive brush holder structure is removed, eliminating the source of jitter and running resistance, which is conducive to maintaining a stable welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic side view of the matching structure of a lateral conductive device for multi-wire submerged arc internal / external welding of a straight seam steel pipe and a straight seam steel pipe according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the side conductive device used for multi-wire submerged arc internal / external welding of straight seam steel pipes, the straight seam steel pipes, and the welding machine according to the present invention;

[0021] Figure 3 This is a schematic structural diagram of a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to the present invention;

[0022] Figure 4 This is a schematic structural diagram of a floating surface contact conductive device in a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to the present invention;

[0023] Figure 5This is a schematic diagram of the front cross-sectional structure of a floating surface contact conductive device in a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to the present invention;

[0024] Figure 6 The present invention is a schematic structural diagram of a lateral conductive brush device in a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Specific implementation method 1

[0029] This embodiment of the invention is a lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes, such as Figures 1-2 As shown, it includes a supporting device 1, a floating surface contact conductive device 2, a lateral conductive brush device 3 and a lateral conductive metal plate 4;

[0030] Support device 1, used to support straight seam steel pipe 5;

[0031] The floating surface contact conductive device 2 is capable of forming surface contact with the outer surface of the straight seam steel pipe 5 and electrically connecting the same;

[0032] The lateral conductive brush device 3 is located on one side of the support device 1, and the lateral conductive brush device 3 includes a plurality of conductive brushes 3-1; and the lateral conductive brush device 3 is electrically connected to the floating surface contact conductive device 2;

[0033] The lateral conductive metal plate 4 is located on one side of the lateral conductive brush device 3, and the lateral conductive metal plate 4 is electrically connected to the negative electrode wire of the welding machine 6;

[0034] The conductive brush 3-1 of the lateral conductive brush device 3 can move to the surface of the lateral conductive metal plate 4 and be electrically connected to the lateral conductive metal plate 4, so that the negative electrode wire, the lateral conductive metal plate 4, the lateral conductive brush device 3, the floating surface contact conductive device 2, the straight seam steel pipe 5 and the welding wire electrode used for multi-wire submerged arc internal / external welding of the straight seam steel pipe form a conductive circuit. Specific implementation method 2

[0036] This embodiment is a further explanation of the first embodiment. In this embodiment, Figures 3-4 As shown, the floating surface contact conductive device 2 includes a base 2-1, a floating device cylinder 2-2, a floating device connecting rod 2-3, a fixed conductive seat 2-4, a conductive wire 2-5, a plurality of conductive floating blocks 2-6 and a plurality of springs 2-7;

[0037] The base 2-1 is fixed to one end of the supporting device 1, and the base 2-1 and the supporting device 1 are insulated;

[0038] The floating device cylinder 2-2 is fixed on the base 2-1;

[0039] The cross section of the floating device connecting rod 2-3 is L-shaped, and one side of the inflection point of the L is a push plate, and the other side is two support rods; the two support rods are arranged in parallel, and one end of the two support rods is fixed to one end of the push plate;

[0040] The floating device connecting rod 2-3 is hinged to the base 2-1 at the inflection point;

[0041] The other end of the push plate is hinged to the power output shaft of the floating device cylinder 2-2;

[0042] The fixed conductive seat 2-4 is located between the two support rods, and the two outer side walls of the fixed conductive seat 2-4 are respectively hinged to the other ends of the two support rods; so that when the power output shaft of the floating device cylinder 2-2 pushes the floating device connecting rod 2-3, the floating device connecting rod 2-3 can lift the fixed conductive seat 2-4;

[0043] A groove is provided on the fixed conductive seat 2-4, and multiple pairs of conductive floating blocks 2-6 are symmetrically inserted into the groove of the fixed conductive seat 2-4. All conductive floating blocks 2-6 are fixed and electrically connected to the fixed conductive seat 2-4 through conductive wires 2-5; and a spring 2-7 is fixed between the bottom of each conductive floating block 2-6 and the groove of the fixed conductive seat 2-4. Specific implementation method three

[0045] This embodiment is a further explanation of the second embodiment. In this embodiment, the floating surface contact conductive device 2 further includes a steel pipe detection device;

[0046] The steel pipe detection device is used to send a floating device start signal when detecting the presence of a steel pipe on the support device 1;

[0047] The floating device cylinder 2-2 is used to extend the power output shaft to push the floating device connecting rod 2-3 after receiving the floating device start signal. Specific implementation method four

[0049] This embodiment is a further explanation of the first, second or third embodiment. Figure 3 As shown, in this embodiment, the floating surface contact conductive device 2 further includes at least one negative electrode welding handle wire connecting plate 2-8;

[0050] The side wall of the fixed conductive seat 2-4 is fixed with a negative electrode welding wire connecting plate 2-8;

[0051] The negative electrode welding handle wire connecting plate 2-8 is electrically connected to the conductive floating block 2-6 through the fixed conductive seat 2-4;

[0052] The lateral conductive brush device 3 is electrically connected to the negative electrode welding wire connecting plate 2-8 through a wire. Specific implementation method five

[0054] This embodiment is a further explanation of the fourth embodiment. Figure 5 As shown, in this embodiment, the lateral conductive brush device 3 further includes a brush base 3-2, a brush conductive plate 3-3, a brush cylinder 3-4 and a sliding guide rail 3-5;

[0055] The brush base 3-2 is fixed to the side of the support device 1;

[0056] The brush conductive plate 3-3 is slidably connected to the brush base 3-2 through the sliding guide rail 3-5;

[0057] The cylinder body of the brush cylinder 3-4 is fixed on the brush base 3-2, and the power output shaft of the brush cylinder 3-4 is fixed to the brush conductive plate 3-3, which can push the brush conductive plate 3-3 to slide relative to the brush base 3-2;

[0058] A plurality of conductive brushes 3-1 are fixed to the outer side wall of the brush conductive plate 3-3; the plurality of conductive brushes 3-1 are electrically connected to the negative electrode welding wire connecting plate 2-8 through the brush conductive plate 3-3 and the wire. Specific implementation method six

[0060] This embodiment is a further explanation of the fifth embodiment. In this embodiment, based on the above-mentioned lateral conductive device, the specific steps are as follows:

[0061] Step 1: Use the steel pipe detection device to detect whether there is a straight seam steel pipe 5 on the support device 1. If so, proceed to step 2; otherwise, remain in standby mode;

[0062] Step 2: The floating surface contact conductive device 2 is lifted, so that the conductive floating block 2-6 forms surface contact with the outer wall of the straight seam steel pipe 5;

[0063] Step 3: The conductive brush 3 - 1 of the lateral conductive brush device 3 extends to contact the lateral conductive metal plate 4 ;

[0064] The negative electrode wire, the lateral conductive metal plate 4, the lateral conductive brush device 3, the floating surface contact conductive device 2, the straight seam steel pipe 5 and the welding wire electrode form a conductive loop when power is supplied.

[0065] Example

[0066] like Figure 1 As shown, when the welder 6 is working, it is located inside the straight seam steel pipe 5. Before welding, a welding wire electrode is pre-arranged in the weld seam of the straight seam steel pipe 5, and the welding wire electrode is connected to the positive pole of the welder 6.

[0067] like Figures 1 and 2 As shown, the present invention connects the negative electrode wire of the welding machine 6 to a whole lateral conductive metal plate 4 (a steel plate can be selected). The lateral conductive metal plate 4 is placed and fixed on a table next to the track of a support device 1 (usually a welding vehicle). The support device 1 serves as a conductive carrier. The side of the support device 1 is provided with a lateral conductive brush device 3 pushed by a brush cylinder 3-4 (the lateral conductive device 3 needs to be insulated from the support device 1). During welding, the conductive brush 3-1 in the lateral conductive brush device 3 extends and contacts the lateral conductive metal plate 4.

[0068] At the front end of the support device 1, there is a floating surface contact conductive device 2 containing a steel pipe detection device (the floating surface contact conductive device 2 can move along the length direction of the steel pipe to adapt to steel pipes of different lengths). When the steel pipe detection device detects the presence of a straight seam steel pipe 5, the floating surface contact conductive device 2 rises under the push of the floating device cylinder 2-2 (the floating device connecting rod 2-3 and the fixed conductive seat 2-4 are insulated by the insulating plate 2-9 and the insulating sleeve 2-10), and forms a surface contact with the conductive floating block 2-6 and the tube body of the straight seam steel pipe 5. At this time, when welding starts, the negative electrode wire, the lateral conductive metal plate 4, the lateral conductive brush device 3, the floating surface contact conductive device 2 and the welding wire electrode form a complete circuit to ensure smooth arc starting of the welding wire.

[0069] In the invention, since the conductive mechanism is in surface contact with the tube body of the straight seam steel pipe 5 (surface contact is formed between the floating surface contact conductive device 2 and the straight seam steel pipe 5), the contact area is large, and the lateral conductive brush device 3 with a smaller contact area is in contact with the external lateral conductive metal plate 4. At this time, even if the steel wire of the conductive brush 3-1 of the lateral conductive brush device 3 arcs on the lateral conductive metal plate 4, it will not cause damage to the straight seam steel pipe 5.

[0070] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes, characterized in that: It comprises a supporting device (1), a floating surface contact conductive device (2), a lateral conductive brush device (3) and a lateral conductive metal plate (4); The supporting device (1) is used to support the straight seam steel pipe (5); The floating surface contact conductive device (2) is capable of forming surface contact with the outer surface of the straight seam steel pipe (5) and electrically connecting the same; The lateral conductive brush device (3) is located on one side of the support device (1), and the lateral conductive brush device (3) comprises a plurality of conductive brushes (3-1); and the lateral conductive brush device (3) is electrically connected to the floating surface contact conductive device (2); The lateral conductive metal plate (4) is located on one side of the lateral conductive brush device (3), and the lateral conductive metal plate (4) is electrically connected to the negative electrode wire of the welding machine (6); The conductive brush (3-1) of the lateral conductive brush device (3) can be electrically connected to the lateral conductive metal plate (4), so that the negative electrode wire, the lateral conductive metal plate (4), the lateral conductive brush device (3), the floating surface contact conductive device (2), the straight seam steel pipe (5), and the welding wire electrode used for multi-wire submerged arc internal / external welding of the straight seam steel pipe form a conductive loop.

2. A lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to claim 1, characterized in that: The floating surface contact conductive device (2) comprises a base (2-1), a floating device cylinder (2-2), a floating device connecting rod (2-3), a fixed conductive seat (2-4), a conductive wire (2-5), a plurality of conductive floating blocks (2-6) and a plurality of springs (2-7); The base (2-1) is fixed to one end of the support device (1), and the base (2-1) and the support device (1) are insulated; The floating device cylinder (2-2) is fixed on the base (2-1); The cross section of the floating device connecting rod (2-3) is L-shaped, and one side of the inflection point of the L is a push plate, and the other side is two support rods; the two support rods are arranged in parallel, and one end of the two support rods is fixed to one end of the push plate; The floating device connecting rod (2-3) is hinged to the base (2-1) at an inflection point; The other end of the push plate is hinged to the power output shaft of the floating device cylinder (2-2); The fixed conductive seat (2-4) is located between the two support rods, and the two outer side walls of the fixed conductive seat (2-4) are respectively hinged to the other ends of the two support rods; so that when the power output shaft of the floating device cylinder (2-2) pushes the floating device connecting rod (2-3), the floating device connecting rod (2-3) can lift the fixed conductive seat (2-4); The fixed conductive seat (2-4) is provided with a groove, and multiple pairs of conductive floating blocks (2-6) are symmetrically inserted into the groove of the fixed conductive seat (2-4). All conductive floating blocks (2-6) are fixed and electrically connected to the fixed conductive seat (2-4) through conductive wires (2-5); and a spring (2-7) is fixed between the bottom of each conductive floating block (2-6) and the groove of the fixed conductive seat (2-4).

3. A lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to claim 2, characterized in that: The floating surface contact conductive device (2) also includes a steel pipe detection device; The steel pipe detection device is used to send a floating device start signal when detecting the presence of a steel pipe on the support device (1); The floating device cylinder (2-2) is used to extend the power output shaft to push the floating device connecting rod (2-3) after receiving a floating device start signal.

4. A lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to claim 3, characterized in that: The floating surface contact conductive device (2) further comprises at least one negative electrode welding wire connecting plate (2-8); The negative electrode welding handle wire connecting plate (2-8) is fixed to the side wall of the fixed conductive seat (2-4); The negative electrode welding handle wire connecting plate (2-8) is electrically connected to the conductive floating block (2-6) via the fixed conductive seat (2-4); The lateral conductive brush device (3) is electrically connected to the negative electrode welding handle wire connection plate (2-8) via a wire.

5. A lateral conductive device for multi-wire submerged arc internal / external welding of straight seam steel pipes according to claim 4, characterized in that: The lateral conductive brush device (3) further comprises a brush base (3-2), a brush conductive plate (3-3), a brush cylinder (3-4) and a sliding guide rail (3-5); The brush base (3-2) is fixed on the side of the support device (1); The brush conductive plate (3-3) is slidably connected to the brush base (3-2) via a sliding guide rail (3-5); The cylinder body of the brush cylinder (3-4) is fixed on the brush base (3-2), and the power output shaft of the brush cylinder (3-4) is fixed to the brush conductive plate (3-3), and can push the brush conductive plate (3-3) to slide relative to the brush base (3-2); A plurality of conductive brushes (3-1) are fixed to the outer side wall of the brush conductive plate (3-3); the plurality of conductive brushes (3-1) are electrically connected to the negative electrode welding handle wire connection plate (2-8) through the brush conductive plate (3-3) and a wire.

6. A lateral conductive method for multi-wire submerged arc internal / external welding of straight seam steel pipes, characterized in that: Based on the lateral conductive device according to claim 5, the specific steps are as follows: Step 1: Use the steel pipe detection device to detect whether there is a straight seam steel pipe (5) on the support device (1). If yes, proceed to step 2; otherwise, remain in standby mode; Step 2: The floating surface contact conductive device (2) is lifted, so that the conductive floating block (2-6) forms surface contact with the outer wall of the straight seam steel pipe (5); Step 3: The conductive brush (3-1) of the lateral conductive brush device (3) extends out to contact the lateral conductive metal plate (4); The negative electrode wire, the lateral conductive metal plate (4), the lateral conductive brush device (3), the floating surface contact conductive device (2), the straight seam steel pipe (5) and the welding wire electrode form a conductive loop when power is supplied.

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