Double-arc double-wire submerged arc welding device suitable for portal frame

Abstract

The double-arc double-wire submerged arc welding device comprises a portal frame connecting piece, an arc welding support is arranged on one side of the portal frame connecting piece, a through hole is formed in the top of the arc welding support, wire feeding devices are symmetrically arranged on the top of the arc welding support, motors are arranged on the two sides of the pair of wire feeding devices, and the motors are arranged on the two sides of the pair of wire feeding devices. A welding gun fixing rod is assembled at the bottom of the arc welding support, a pair of welding gun clamping pieces is arranged on the welding gun fixing rod, and a first welding gun and a second welding gun are arranged on the pair of welding gun clamping pieces respectively. According to the device, double-arc welding can be achieved, the height and the included angle of the welding gun can be flexibly adjusted, and the welding penetration depth is accurately controlled. According to the device, while the welding efficiency and the welding quality are guaranteed, the personal error in the welding process can be reduced, the control capability on the welding penetration depth is remarkably improved, the personnel safety is guaranteed, and the overall use performance of equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a welding device, concretely to a double-arc double-wire submerged-arc welding device suitable for a portal frame. BACKGROUND

[0002] Welding is widely used in various fields such as mechanical manufacturing, construction, automobile and shipbuilding as an important connection process. The quality of welding directly affects the safety, reliability and durability of the product. Among many welding technologies, submerged arc welding is widely concerned due to its high welding efficiency, excellent weld quality and small heat-affected zone. However, the traditional submerged arc welding equipment has certain limitations, especially in the control of welding penetration. Welding penetration refers to the depth of molten metal during welding, which is a key indicator of welding quality. Proper control of penetration not only directly affects the strength and toughness of the welded joint, but also determines the forming quality of welding. Excessive penetration may cause workpiece deformation, cracking or welding defects, while insufficient penetration may result in poor welding and failure to meet design requirements. In existing welding technology, the penetration control is complex when welding, and the operator cannot timely adjust the height and other parameters of the welding torch, which is prone to errors and affects the penetration. Moreover, it is difficult to effectively configure the welding equipment when welding large equipment.

[0003] Therefore, there is an urgent need for a double-arc double-wire submerged-arc welding device suitable for a portal frame. The device can realize double-arc welding and flexibly adjust the height and angle of the welding torch to accurately control the welding penetration. While ensuring welding efficiency and quality, the device can minimize human error during welding, significantly improve the control ability of welding penetration, ensure personnel safety, and improve the overall performance of the equipment. SUMMARY

[0004] The utility model aims at providing a double-arc double-wire submerged-arc welding device suitable for a portal frame. The device can realize double-arc welding and flexibly adjust the height and angle of the welding torch to accurately control the welding penetration. With the multiple adjustment mechanisms of the fine adjustment lifting rod, the automatic wire feeder and the welding torch holder, the device can minimize human error during welding, significantly improve the control ability of welding penetration, ensure personnel safety, and improve the overall performance of the equipment. The structure is reliable, easy to operate and widely applicable.

[0005] The utility model discloses a double-arc double-wire submerged-arc welding device suitable for a portal frame, which comprises a portal frame connecting piece, wherein:

[0006] The gantry connector is provided with an arc welding bracket on one side. The top of the arc welding bracket is provided with a through hole. The top of the arc welding bracket is symmetrically provided with wire feeding devices. Motors are provided on both sides of the pair of wire feeding devices. The bottom of the arc welding bracket is equipped with a welding gun fixing rod. The welding gun fixing rod is provided with a pair of welding gun clamps. The pair of welding gun clamps are respectively provided with a first welding gun and a second welding gun. One end of the welding gun fixing rod is connected to a fine adjustment lifting rod. The bottom of the arc welding bracket is equipped with a set of rollers. A flux pipe clamp is provided on one side of the bottom of the arc welding bracket.

[0007] Preferably, the gantry frame connector includes a slide rail, a fixed plate is provided on the top of the slide rail, an electro-hydraulic actuator is mounted on the fixed plate, the telescopic end of the electro-hydraulic actuator passes through the fixed plate and is connected to the arc welding bracket slider, the arc welding bracket slider is mounted on the slide rail, and an arc welding bracket connecting rod is fixedly installed on the arc welding bracket slider and connected to the arc welding bracket.

[0008] Preferably, the bottom of the arc welding bracket is provided with a height adjustment hole, and both ends of the welding torch fixing rod pass through the height adjustment hole.

[0009] Preferably, the fine-tuning lifting rod includes a height lifting screw fixing frame, a height lifting screw is provided on one side of the height lifting screw fixing frame, a screw rotation handle is provided on the top of the height lifting screw, and a fixing rod connecting block is provided at the bottom of the height lifting screw, the fixing rod connecting block being connected to one end of the welding gun fixing rod.

[0010] Preferably, the welding torch holder includes a pair of position adjustment clips and a pair of angle adjustment clips. The bottom of the position adjustment clip is provided with an angle adjustment fixing block. The angle adjustment fixing block is provided with a through hole. One end of the through hole is provided with a thread. The other end of the through hole is detachably connected to the angle adjustment clip connecting rod. The threaded end of the angle adjustment clip connecting rod passes through the through hole. One end of the angle adjustment clip connecting rod is fixedly connected to the angle adjustment clip. The clamping part of the angle adjustment clip is provided with a threaded fastener. The pair of position adjustment clips are mounted on the welding torch fixing rod. The clamping parts of the pair of angle adjustment clips respectively clamp the first welding torch and the second welding torch.

[0011] Preferably, the position adjusting clamp is provided with a first lead screw fixing hole, and a first adjusting lead screw is detachably connected in the first lead screw fixing hole.

[0012] Preferably, a second adjusting screw is inserted inside the angle adjusting fixing block, and one end of the second adjusting screw passes through the angle adjusting fixing block and the angle adjusting clamp connecting rod in sequence.

[0013] The beneficial effects of this utility model: This utility model provides a double-arc, double-wire submerged arc welding device suitable for gantry cranes.

[0014] Improving welding efficiency: due to the adoption of double-arc double-wire welding technology, the device can weld two welds at the same time, which can significantly improve the efficiency of welding operation, speed up the production rhythm, and reduce the worker's work intensity per unit time.

[0015] Improving welding quality: the device is equipped with advanced welding gun holder, which can better fix the welding gun and has the function of adjusting position and angle, so as to ensure the consistency of contact between the welding gun and the workpiece, reduce the weld defects, and improve the quality of the welding joint.

[0016] Precise height adjustment function: the design of fine adjustment lifting rod makes the height adjustment of the welding gun more accurate, which can adapt to the welding needs of workpieces of different thicknesses, and effectively improves the stability and uniformity of welding.

[0017] Flexible welding adaptability: the design of the welding gun holder allows the welding gun to be adjusted in both horizontal and vertical directions, so that it can adapt to workpieces of different shapes and sizes, and meet various welding needs.

[0018] Easy operation: the structural design of the device reduces the operation difficulty to a certain extent, so that the operator can more conveniently adjust and operate the equipment, reduces the dependence on the operator's skills, and improves the universal adaptability of the equipment.

[0019] Efficient penetration control mechanism: the device provides a unique fine adjustment lifting rod, and the operator can accurately adjust the height of the welding gun according to different welding workpieces and material types. This adjustment directly affects the stability of the electric arc and the shape of the molten pool, thereby effectively controlling the welding penetration.

[0020] Flexible welding gun angle adjustment function: through the angle adjustment of the welding gun holder, the device can finely adjust the included angle between the welding gun and the workpiece, which can improve the distribution of the penetration and improve the bonding force of the weld, and reduce the occurrence of incomplete penetration or excessive melting.

[0021] Automatic wire feeding device: during the welding process, the accurate operation of the wire feeding device can effectively maintain the consistent supply of metal filler material, thereby helping to control the penetration. At a proper wire feeding speed, the molten pool can be stabilized during the welding process, and deformation is not easy to occur, thereby optimizing the penetration.

[0022] Reducing human factors: the design of the device reduces the influence of human operation on the penetration as much as possible, and ensures the consistency of welding parameters through structural adjustment, which helps to form a more stable penetration control mechanism, thereby improving the consistency and reliability of welding. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A double-arc double-wire submerged arc welding device suitable for a gantry is shown in the schematic view of the utility model.

[0024] Figure 2 The utility model relates to a double-arc double-wire submerged-arc welding device suitable for a portal frame Figure 1 Partial view of A in the middle;

[0025] Figure 3 The utility model relates to a double-arc double-wire submerged-arc welding device suitable for a portal frame, and the sectional view of a welding gun holding clamp;

[0026] Figure 4 The utility model relates to a double-arc double-wire submerged-arc welding device suitable for a portal frame, and the sectional view of a welding gun holding clamp;

[0027] In the drawing:

[0028] Portal frame connecting piece 1, slide rail 101, electro-hydraulic push rod 103, fixed plate 102, arc welding support sliding block 104, arc welding support connecting rod 105;

[0029] Arc welding support 2, height adjustment hole 201, wire feeding device 3, motor 4, welding gun fixing rod 5;

[0030] Welding gun holding clamp 6, position adjusting clamp 601, first screw rod fixing hole 601-1, first adjusting screw rod 601-2, angle adjusting clamp 602, angle adjusting fixed block 603, second adjusting screw rod 603-1, angle adjusting clamp connecting rod 604;

[0031] First welding gun 7, second welding gun 8;

[0032] Fine adjustment lifting rod 9, height lifting screw rod fixing frame 901, height lifting screw rod 902, screw rod rotating handle 903, fixed rod connecting block 904;

[0033] Roller 10, flux pipeline clamp 11. DETAILED DESCRIPTION

[0034] In order to make the utility model technical scheme easier to understand, the technical scheme of the utility model is described clearly and completely in the form of specific embodiments in combination with the drawings.

[0035] Example 1:

[0036] As Figures 1-4 shown, the Figures 1-4 The utility model relates to a double-arc double-wire submerged-arc welding device suitable for a portal frame, including portal frame connecting piece 1, wherein:

[0037] The gantry connecting piece 1 is provided with an arc welding support 2 on one side, the top of the arc welding support 2 is provided with a through hole, and a pair of wire feeding devices 3 are symmetrically arranged on the top of the arc welding support 2, a pair of motors 4 are arranged on the two sides of the wire feeding devices 3, a welding gun fixing rod 5 is arranged at the bottom of the arc welding support 2, a pair of welding gun holding clamps 6 are arranged on the welding gun fixing rod 5, a first welding gun 7 and a second welding gun 8 are respectively arranged on the welding gun holding clamps 6, one end of the welding gun fixing rod 5 is connected with a fine adjustment lifting rod 9, a group of rollers 10 are arranged at the bottom of the arc welding support 2, and a welding flux pipeline clamp 11 is arranged on one side of the bottom of the arc welding support 2.

[0038] The gantry connecting piece 1 comprises a sliding rail 101, a fixed plate 102 is arranged at the top of the sliding rail 101, an electro-hydraulic push rod 103 is arranged on the fixed plate 102, the telescopic end of the electro-hydraulic push rod 103 penetrates through the fixed plate 102 and is connected to an arc welding support sliding block 104, the arc welding support sliding block 104 is arranged on the sliding rail 101, an arc welding support connecting rod 105 is fixedly arranged on the arc welding support sliding block 104, and the arc welding support connecting rod 105 is connected to the arc welding support 2.

[0039] The bottom of the arc welding support 2 is provided with a height adjusting hole 201, and the two ends of the welding gun fixing rod 5 penetrate through the height adjusting hole 201.

[0040] The fine adjustment lifting rod 9 comprises a height lifting screw rod fixing frame 901, one side of the height lifting screw rod fixing frame 901 is provided with a height lifting screw rod 902, the top of the height lifting screw rod 902 is provided with a screw rod rotating handle 903, the bottom of the height lifting screw rod 902 is provided with a fixed rod connecting block 904, and one end of the fixed rod connecting block 904 is connected to one end of the welding gun fixing rod 5.

[0041] The welding gun holding clamp 6 comprises a pair of position adjusting clamps 601 and a pair of angle adjusting clamps 602, the bottom of the position adjusting clamp 601 is provided with an angle adjusting fixed block 603, the angle adjusting fixed block 603 is provided with a through hole penetrating therethrough, one end of the through hole is provided with a thread, the other end of the through hole is detachably connected with an angle adjusting clamp connecting rod 604, one end of the angle adjusting clamp connecting rod 604 provided with a thread is arranged in the through hole, one end of the angle adjusting clamp connecting rod 604 is fixedly connected with the angle adjusting clamp 602, the holding part of the angle adjusting clamp 602 is provided with a threaded fastener, a pair of position adjusting clamps 601 are arranged on the welding gun fixing rod 5, and the holding parts of the pair of angle adjusting clamps 602 are respectively provided with the first welding gun 7 and the second welding gun 8.

[0042] The position adjusting clamp 601 is provided with a first screw rod fixing hole 601-1, and the first adjusting screw rod 601-2 is detachably connected in the first screw rod fixing hole 601-1.

[0043] The angle adjusting fixed block 603 is provided with a second adjusting screw rod 603-1, one end of the second adjusting screw rod 603-1 is sequentially provided through the angle adjusting fixed block 603 and the angle adjusting clamp connecting rod 604.

[0044] In use, the slide rail 101 and the fixed plate 102 are fixedly connected at one position of the portal frame, one side of the electro-hydraulic push rod 103 is also arranged on the portal frame, the movable end of the electro-hydraulic push rod 103 and the arc welding support sliding block 104 are moved, and the arc welding support connecting rod 105 is driven to move, so as to adjust the height of the entire arc welding support 2.

[0045] The welding gun fixing rod 5 is provided with a fine adjustment lifting rod 9 on one side, the fine adjustment lifting rod 9 is used for adjusting the height of the fixing rod connecting block 904 in the height adjusting hole 201 by rotating the screw rod handle 903.

[0046] The welding gun fixing rod 5 is provided with a welding gun holding clamp 6, the welding gun holding clamp 6 comprises a position adjusting clamp 601 and an angle adjusting clamp 602.

[0047] The position adjusting clamp 601 is mainly used for adjusting the first welding gun 7 and the second welding gun 8 by moving left and right on the welding gun fixing rod 5, loosening the first adjusting screw rod 601-2 to loosen the holding part of the position adjusting clamp 601, and adjusting the position, and moving the angle adjusting fixed block 603 when adjusting the position.

[0048] The angle adjusting clamp 602 is mainly used for being fixedly connected with the position adjusting clamp 601 through the angle adjusting fixed block 603, moving together, being provided with a screw thread in the angle adjusting clamp connecting rod 604, being inserted into the hole of the angle adjusting fixed block 603 at one end of the angle adjusting clamp connecting rod 604, being inserted into the hole of the angle adjusting fixed block 603 through the second adjusting screw rod 603-1 after adjusting the angle adjusting clamp 602 to the required angle, and being fixed in angle, and being fastened by a screw in the holding part of the angle adjusting clamp 602 after confirming that the angle is fixed correctly, so as to fix the first welding gun 7 and the second welding gun 8.

[0049] Based on the requirements can be individually adjusted each welding wire welding heat input, the current double wire submerged arc welding more using two independent power supply. First is the type of power supply, can be DC + DC, AC + AC, DC + AC, etc. Selection of DC + DC power supply should take into account the electromagnetic force on the arc and the molten pool, and the arc magnetic bias blow effect, arc magnetic bias blow can cause weld porosity, slag, welding offset caused by lack of fusion defects; selection of AC + AC power supply can reduce the effect of electromagnetic force, but should take into account the alkalinity of the flux on the stability of the AC arc; selection of DC + AC power supply can avoid the shortcomings of the first two power supply, but the inhibition of porosity is not as good as double DC power supply.

[0050] Usually choose DC + AC, the front wire connection DC power supply, the rear wire connection AC power supply, wire arrangement mode has horizontal, vertical and serial type, etc. Application generally used vertical, that is, two wires along the welding direction in sequence. General front conducting arc is DC, low voltage and large current, to obtain sufficient penetration, followed by arc AC, low current and high voltage, adjust the width or to improve the role of shaping, to form a flat smooth weld profile.

[0051] Wire spacing:

[0052] According to the different distance between the two wires, its method has a molten pool method and separate arc (ie not molten pool) two methods, both can improve productivity. Wire spacing and angle is the main factor affecting the weld penetration, molten pool shape, arc action and weld formation, wire spacing and angle should be based on the form of groove, weld appearance and welding speed

[0053] In the double-arc welding, the two arcs act on one molten pool, the stirring action of the arc is enhanced, and the unmelted edge of the groove can be effectively eliminated. At the same time, the bottom area of the molten pool is expanded, and the formation of the pear-shaped weld is avoided, which can reduce the probability of the root heat crack. In the welding process, the gas is inevitable, and the key is whether the gas hole is formed. The double-arc single-pool submerged arc welding creates good conditions for the gas to escape, and the influence on the formation of the gas hole is mainly the enhancement of the stirring action of the double arc on the molten pool. Of course, the increase of the high-temperature residence time of the molten pool and the more sufficient metallurgical reaction also have a certain effect. In the appearance of the weld, the undercut and the fish scale on the surface of the weld can be effectively reduced, and it is especially suitable for the double-wire capping occasions. The distance between the single-pool welding wires should be controlled within 10-40 mm, and there is an optimal distance for a specific welding joint form. The welding wire distance of the I-shaped joint welding can be appropriately increased, and the welding wire distance of the V-shaped joint welding can be appropriately reduced, and the general distance is not more than 25 mm. The front welding wire is usually perpendicular to the steel surface or slightly dragged backward to obtain the best penetration; the rear welding wire is generally inclined forward to obtain a smooth surface formation. This way is easy to adjust the weld composition by matching the welding wires, and the purpose of adjusting the joint organization and performance is achieved. The double-pool submerged arc welding can play the roles of the front arc preheating, the rear arc filling and the rear heat treatment, so as to achieve the purposes of the surfacing or welding of the alloy steel without cracks and the improvement of the joint performance. The advantage of the double-pool is that the welding heat input can be controlled in a larger range. When adjusting the welding wire angle, the diameter of the pipeline and the influence of the downhill welding should be fully considered. The main wire should be designed to have a certain backward inclination, and the auxiliary wire has a certain forward inclination, or the main wire is perpendicular and the auxiliary wire has a certain forward inclination. The distance between the welding wires and the angle between the welding wires and the workpiece. At this time, the front arc has the effects of the penetration and the preheating, and the rear arc has the effects of the increased productivity, the delayed weld cooling speed and the rear heat treatment of the previous layer of the weld. In the double-pool submerged arc welding, the distance between the welding wires should be selected according to the solidification temperature, the solidification time and the conductivity of the slag of the used flux, and the maximum distance between the welding wires should be less than the solidification length of the slag.

[0054] The fillet size of the corner joint welded by the double-wire submerged arc welding is greater than 8 mm, which can be welded in the ship-shaped position or the horizontal position. When the same thickness of the bottom plate and the web plate is assembled in the ship-shaped position, the angle between the wire and the workpiece can be 45°. If the thickness of the plate is different, the angle between the wire and the workpiece can be less than 45°, so that the wire is close to the thick plate side. The assembly gap between the bottom plate and each web plate is usually less than 1.5 mm. Otherwise, the back of the weld should be padded with flux to prevent the molten metal from flowing out of the gap.

[0055] When welded in the horizontal position, the weld formation is not easy to control, and the wire is usually deviated to the bottom plate. The angle between the wire and the bottom plate can be between 30° and 40°.

[0056] The tandem double arc welding is an ideal method for single-sided welding once forming, and needs forced forming, and commonly used methods are a welding agent copper pad method of a portal pressure frame, a water-cooled sliding block copper pad method, and a hot solidification welding agent backing pad method. The welding agent copper pad method of the portal pressure frame is to use a portal frame which spans the welding piece and has a plurality of air cylinders to press the welding piece tightly on the copper pad which is sprinkled with the welding agent to perform the submerged arc welding. Table 11-7 is the double-wire single-sided welding double-sided forming submerged arc welding parameter of the welding agent copper pad method of the portal pressure frame. The water-cooled sliding block copper pad method is to use the assembly gap to tightly attach the water-cooled copper sliding block to the welding seam back, and clamp and install the water-cooled copper sliding block on the welding trolley to move together with the electric arc to force the welding seam forming. Table 11- lists the process parameters, and the welding wire spacing is adjusted within 60-150 mm. The hot solidification welding agent is made of strip-shaped hot solidification welding agent and asbestos cloth, corrugated paper, etc., to prevent the molten pool metal from overflowing and control the back forming. Table 11-8 is the typical application parameter of the hot solidification agent backing pad method.

[0057] Narrow gap submerged arc welding:

[0058] For the welding piece with a thickness of more than 50 mm, if the ordinary V-shaped or U-shaped gap submerged arc welding is used, the welding layer, the welding pass, the welding seam metal filling amount and the required welding time all increase in geometric progression with the thickness, the welding deformation is large and difficult to control, and the narrow gap submerged arc welding is suitable. The bottom layer gap of the narrow gap groove is 12-35 mm, the groove angle is 1-7°, and the process pad is commonly used for bottom welding. Since the electric arc is extremely easy to induce magnetic blow in the narrow groove, the alternating current arc must be used. In order to improve the deposition and welding speed of the narrow groove submerged arc welding, the tandem double welding is used, and the tandem double arc of the AC-AC combination can be used. In order to make the welding wire reach the bottom layer of the narrow gap of the thick plate, the special narrow welding nozzle which can be inserted into the gap is designed, and the welding wire overhanging length is taken as 50-75 mm to obtain a higher deposition rate. The special welding agent is used for the narrow gap welding, the particle size is generally finer, the deslagging property is particularly good, and the high-alkalinity sintered welding agent is mostly used. In order to ensure the correct position of the welding wire and the electric arc in the deep and narrow groove, the automatic tracking control is suitable.

[0059] It should be noted that the embodiments described herein are only part of the embodiments of the present application, not all the implementation manners of the present application, the embodiments are only exemplary, and the role is only to provide a more intuitive and clear way to understand the content of the present application, and is not a limitation on the technical solutions of the present application. Without departing from the concept of the present application, all other embodiments that can be thought of by those skilled in the art without creative labor and other simple replacements and various changes of the technical solutions of the present application all belong to the protection scope of the present application.

Claims

1. A double-arc double-wire submerged-arc welding device suitable for a gantry, characterized in that, The gantry connecting piece (1) comprises an arc welding support (2) on one side of the gantry connecting piece (1), a through hole is arranged on the top of the arc welding support (2), a pair of wire feeding devices (3) are symmetrically arranged on the top of the arc welding support (2), a pair of motors (4) are arranged on the two sides of the wire feeding devices (3), a welding gun fixing rod (5) is arranged at the bottom of the arc welding support (2), a pair of welding gun holding clamps (6) are arranged on the welding gun fixing rod (5), a first welding gun (7) and a second welding gun (8) are respectively arranged on the welding gun holding clamps (6), one end of the welding gun fixing rod (5) is connected with a fine adjustment lifting rod (9), a group of rollers (10) are arranged at the bottom of the arc welding support (2), and a welding flux pipeline clamp (11) is arranged on one side of the bottom of the arc welding support (2). The gantry connecting piece (1) comprises a sliding rail (101), a fixed plate (102) is arranged on the top of the sliding rail (101), an electro-hydraulic push rod (103) is arranged on the fixed plate (102), the telescopic end of the electro-hydraulic push rod (103) penetrates through the fixed plate (102) and is connected to an arc welding support sliding block (104), the arc welding support sliding block (104) is arranged on the sliding rail (101), an arc welding support connecting rod (105) is fixedly arranged on the arc welding support sliding block (104), and the arc welding support connecting rod (105) is connected to the arc welding support (2).

2. A twin-arc twin-wire submerged-arc welding device for a gantry as set forth in claim 1, characterized in that, A height adjustment hole (201) is arranged at the bottom of the arc welding support (2), and the two ends of the welding gun fixing rod (5) penetrate through the height adjustment hole (201).

3. A twin-arc twin-wire submerged-arc welding device for a gantry as set forth in claim 1, wherein The fine adjustment lifting rod (9) comprises a height lifting screw rod fixing frame (901), a height lifting screw rod (902) is arranged on one side of the height lifting screw rod fixing frame (901), a screw rod rotating handle (903) is arranged on the top of the height lifting screw rod (902), a fixed rod connecting block (904) is arranged at the bottom of the height lifting screw rod (902), and one end of the fixed rod connecting block (904) is connected to one end of the welding gun fixing rod (5).

4. A twin-arc twin-wire submerged-arc welding device for a gantry as set forth in claim 1, wherein The welding gun holding clamp (6) comprises a pair of position adjusting clamps (601) and a pair of angle adjusting clamps (602), an angle adjusting fixed block (603) is arranged at the bottom of the position adjusting clamp (601), a through hole is arranged on the angle adjusting fixed block (603), a thread is arranged at one end in the through hole, the other end of the through hole is detachably connected with an angle adjusting clamp connecting rod (604), one end of the angle adjusting clamp connecting rod (604) is arranged in the through hole, one end of the angle adjusting clamp connecting rod (604) is fixedly connected with the angle adjusting clamp (602), a threaded fastener is arranged on the holding part of the angle adjusting clamp (602), a pair of position adjusting clamps (601) are arranged on the welding gun fixing rod (5), and the holding parts of the pair of angle adjusting clamps (602) are respectively clamped with the first welding gun (7) and the second welding gun (8).

5. A twin-arc twin-wire submerged-arc welding device for a gantry as claimed in claim 1, wherein A first screw rod fixing hole (601-1) is arranged on the position adjusting clamp (601), and a first adjusting screw rod (601-2) is detachably connected in the first screw rod fixing hole (601-1).

6. A twin-arc twin-wire submerged-arc welding device for a gantry as claimed in claim 5, characterized in that ​ 7. A twin-arc twin-wire submerged-arc welding device for a gantry as claimed in claim 5, wherein The angle adjusting fixed block (603) is provided with a second adjusting lead screw (603-1) penetrating therein, one end of the second adjusting lead screw (603-1) penetrating through the angle adjusting fixed block (603) and the angle adjusting clamp connecting rod (604) in sequence.

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