Submerged-arc welding-based underwater submerged-arc welding device and underwater submerged-arc welding machine

Abstract

The invention relates to the technical field of underwater welding, in particular to an underwater submerged-arc welding device and an underwater submerged-arc welding machine based on submerged-arc welding, comprising a welding gun, a welding flux assembly, a paste submerged-arc welding agent, a support arm, a hoop and a welding flux propeller, the welding flux assembly comprises a welding flux cabin, a welding flux storage cylinder and a welding flux nozzle, the paste submerged-arc welding agent is stored in the welding flux storage cylinder, and the welding flux cabin is connected with the support arm; the welding flux storage barrel is placed in the welding flux cabin, the welding flux nozzle is arranged at the front end of the welding flux cabin, the welding flux propeller is arranged at the rear end of the welding flux cabin and used for extruding paste submerged-arc welding flux in the welding flux cabin, the welding flux assembly is connected with one end of the supporting arm, the other end of the supporting arm is connected with the hoop, and the welding gun is embedded in the hoop. The supporting arm adjusts the included angle between the axis of the welding gun and the axis of the welding flux assembly, and the included angle ranges from 15 degrees to 45 degrees. By using the welding assembly, the paste submerged-arc welding flux can be put in front of the advancing direction of the welding arc as required in advance, and it is ensured that the submerged-arc welding flux effectively protects the underwater welding arc and a molten pool.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater welding, and particularly to an underwater submerged arc welding device and an underwater submerged arc welding machine based on submerged arc welding. Background Art

[0002] Underwater welding techniques include dry welding, local dry welding, and wet welding. Among them, dry welding and local dry welding are methods of removing water in the welding area through special devices or introducing gases for welding, while the wet welding method does not require special drainage facilities, and the welding materials are directly welded in water. Therefore, the underwater wet welding technique has the advantages of simple equipment, low cost, flexible operation, strong adaptability, etc., and its engineering adaptability is the most extensive.

[0003] During underwater wet welding operations, the electrode and the workpiece are in direct contact with water. The differences in the physical characteristics of the water medium and the air medium determine that its welding process has completely different characteristics. During underwater wet welding, the arc burns inside a mixed gas bubble formed by hydrogen and oxygen decomposed from water at high temperature and gases generated by the reaction of the flux coating, flux cored wire, and welding flux. The stability of the arc is directly affected by the dynamic process of bubble formation, growth, and detachment. When the bubble detaches from the welding area or ruptures, the arc will go out, affecting the stability of the welding process. In addition, since the welded joint is directly exposed to water, the high cooling rate causes the weld and the heat affected zone to easily form hardened structures, cracks, pores and other defects. The decomposition of water causes the arc bubble to be rich in hydrogen, exacerbating the hydrogen-induced cracking sensitivity of the welded joint. The above factors all reduce the strength, toughness and reliability of the welded joint, restricting the engineering application of the underwater wet welding technique.

[0004] Submerged arc welding is a method of welding in which the arc burns under a layer of welding flux. The welding flux and the molten slag generated by its melting reaction not only play a mechanical protection role for the molten pool and the weld metal, but also can effectively isolate the air from contacting the molten pool and purify the composition of the weld metal. Combining the submerged arc welding technique with the underwater wet welding technique to develop the underwater submerged arc welding technique is expected to utilize the mechanical protection of the submerged arc welding flux to achieve physical isolation between the water environment and the arc and the molten pool, eliminate the adverse effects of the water environment on the underwater wet welding process, and greatly improve the performance of the underwater wet welded joint.

[0005] To achieve the effective protection of the welding flux for the arc and the molten pool during underwater submerged arc welding, it is required that the submerged arc welding flux can not only effectively isolate the water environment, but also effectively cover and protect the arc with a certain thickness layer, and does not affect the stability of wire feeding and torch movement. This requires that the underwater submerged arc welding flux is a waterproof paste with moderate viscosity. Currently, there is no special device for underwater submerged arc welding, and it is impossible to achieve the stable placement of the paste-like underwater submerged arc welding flux using a land-based submerged arc welding device. Summary of the Invention

[0006] Aiming at the problems existing in the prior art that during underwater submerged arc welding, the paste submerged arc welding flux is placed unstably and unevenly, the placement efficiency is low, and the supply demand cannot be controlled, the purpose of the present invention is to provide a special device for underwater submerged arc welding that can place the paste submerged arc welding flux evenly and stably, improve the flux placement efficiency, and reasonably control the flux supply demand.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: an underwater submerged arc welding device based on submerged arc welding, including a welding torch, a flux assembly, a paste submerged arc welding flux, a support arm, a clamp, and a flux pusher. The flux assembly includes a flux chamber, a flux storage cylinder, and a flux nozzle. The paste submerged arc welding flux is stored in the flux storage cylinder, the flux storage cylinder is placed in the flux chamber, the flux nozzle is arranged at the front end of the flux chamber, and the flux pusher is arranged at the rear end of the flux chamber for extruding the paste submerged arc welding flux in the flux chamber. The flux assembly is connected to one end of the support arm, the other end of the support arm is connected to the clamp, the welding torch is nested in the clamp, and the support arm adjusts the angle between the axis of the welding torch and the axis of the flux assembly, and the angle is set between 15° and 45°.

[0008] For the above-mentioned underwater submerged arc welding device based on submerged arc welding, the support arm includes a fixed arm, a rotating arm, and a support arm bolt. The rear end of the fixed arm is fixedly connected to the flux assembly, the front end of the rotating arm is fixedly connected to the clamp. The front end of the fixed arm is flat and provided with a fixing hole, the rear end of the rotating arm is flat and provided with a rotating hole, and the support arm bolt is inserted into the fixing hole and the rotating hole, and the support arm bolt is tightened to press the front end of the fixed arm and the rear end of the rotating arm.

[0009] For the above-mentioned underwater submerged arc welding device based on submerged arc welding, a pointer parallel to the axis of the flux assembly is arranged outside the fixing hole, an angle adjustment scale is arranged outside the rotating hole, and the angle adjustment scale cooperates with the pointer to adjust the angle of the included angle, and the included angle is set to 30°.

[0010] For the above-mentioned underwater submerged arc welding device based on submerged arc welding, the flux pusher includes a stepping motor, a gantry support seat, a lead screw, a backing plate, and a pushing block. The gantry support seat is fixed outside the flux chamber, the backing plate is slidably connected to the gantry support seat, the stepping motor is fixed on the backing plate, one end of the lead screw is connected to the output end of the stepping motor, and the other end passes through the top of the flux chamber and presses against the pushing block, the pushing block abuts against the flux storage cylinder, and a central hole thread is arranged at the top of the flux chamber, and the lead screw is screwed into the central hole thread.

[0011] The above-mentioned submerged arc welding device based on submerged arc welding, the gantry support seat includes two parallel round rods, the bottom ends of the round rods are vertically fixed on the top of the flux cabin, and the top ends of the round rods are fixedly connected by a cross bar.

[0012] The above-mentioned submerged arc welding device based on submerged arc welding, on both sides of the backing plate there are plate holes at the same distance from the two parallel round rods, and the round rods are sleeved in the plate holes.

[0013] The above-mentioned submerged arc welding device based on submerged arc welding, at the connection between the lead screw and the push block there is a bearing, the outside of the bearing is fixedly connected to the push block, and the inner hole of the bearing is fixedly connected to the lead screw.

[0014] The above-mentioned submerged arc welding device based on submerged arc welding, the flux nozzle is made of corrosion-resistant metal as a whole, and the distance between the flux nozzle and the axis of the conducting nozzle of the welding torch is not less than 10 mm.

[0015] An underwater submerged arc welding machine includes an underwater automatic walking mechanism or an underwater robotic arm, and on the underwater automatic walking mechanism or the underwater robotic arm there is arranged a submerged arc welding device based on submerged arc welding as described in any one of the above.

[0016] The beneficial effects of the submerged arc welding device based on submerged arc welding and the underwater submerged arc welding machine of the present invention are as follows: At present, in the research of underwater submerged arc welding, the placement method of the flux is manual prefabricated smearing, and there is no special underwater submerged arc welding device. The present invention can realize the real-time on-demand uniform placement of the flux during the underwater submerged arc welding process, and solves the technical problems of low flux placement efficiency, uncontrollable supply quantity and form during the underwater submerged arc welding process. By using the welding assembly, the paste-shaped submerged arc welding flux can be placed in front of the advancing direction of the welding arc on demand in advance, ensuring the effective protection of the underwater welding arc and the molten pool by the submerged arc welding flux. By adjusting the rotation speed of the stepping motor, the conveying speed of the paste-shaped submerged arc welding flux can be controlled, and further the flux coverage thickness in the welding area can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic three-dimensional structure diagram of the underwater submerged arc welding device in the embodiment of the present invention; Figure 2 is a front schematic three-dimensional structure diagram of the underwater submerged arc welding device in the embodiment of the present invention; Figure 3 is a sectional view taken along line A-A in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be described below in conjunction with the detailed implementation manners and the accompanying drawings.

[0019] The underwater submerged arc welding device provided by the present invention can achieve stable and controllable dispensing of paste-type underwater submerged arc welding flux and arc ignition and controllable feeding of the welding wire. The device mainly includes a welding torch and an underwater submerged arc welding flux dispensing system. The underwater submerged arc welding flux dispensing system and the welding torch are connected by an annular clamp, and the included angle between their axes is about 30 o .

[0020] Example 1 As Figure 1 shown, an underwater submerged arc welding device based on submerged arc welding includes a welding torch 100, a flux assembly 220, paste-type submerged arc welding flux, a support arm 225, a clamp 224, and a flux pusher 210. The clamp uses an annular structure.

[0021] The flux assembly includes a flux chamber 221, a flux storage cylinder 222, and a flux nozzle 223. The paste-type submerged arc welding flux is stored in the flux storage cylinder. The flux storage cylinder is placed in the flux chamber. The flux nozzle is arranged at the front end of the flux chamber. The flux pusher is arranged at the rear end of the flux chamber for extruding the paste-type submerged arc welding flux in the flux chamber.

[0022] One end of the support arm is connected to the flux assembly, and the other end of the support arm is connected to the clamp. The welding torch is nested in the clamp. The support arm adjusts the included angle between the axis of the welding torch and the axis of the flux assembly, and the included angle is set between 15° - 45°.

[0023] Further, in order to facilitate adjusting the angle of the included angle and thus adjusting the angle between the flux nozzle and the welding torch, the support arm includes a fixed arm, a rotating arm, and a support arm bolt. The rear end of the fixed arm is fixedly connected to the flux assembly. The front end of the rotating arm is fixedly connected to the clamp. The front end of the fixed arm is flat and provided with a fixed hole. The rear end of the rotating arm is flat and provided with a rotating hole. The support arm bolt is inserted into the fixed hole and the rotating hole, and the support arm bolt is tightened to press the front end of the fixed arm and the rear end of the rotating arm.

[0024] A pointer parallel to the axis of the flux assembly is arranged outside the fixed hole, and an angle adjustment scale is arranged outside the rotating hole. The angle adjustment scale and the pointer cooperate to adjust the angle of the included angle, and the included angle is set to 30°.

[0025] The flux pusher includes a stepper motor 211, a gantry support seat 212, a backing plate, a lead screw 214, and a pusher block 215. The gantry support seat is fixed on the outside of the flux chamber. The backing plate is slidably connected to the gantry support seat. The stepper motor is fixed on the backing plate. One end of the lead screw is connected to the output end of the stepper motor, and the other end passes through the top of the flux chamber and abuts against the pusher block. The pusher block abuts against the flux storage cylinder. A central hole thread is arranged at the top of the flux chamber, and the lead screw is screwed into the central hole thread. The backing plate can be made of metal material or non-metal material.

[0026] Example 2 The submerged arc welding flux is packaged in a replaceable flux storage cylinder. The flux storage cylinder has a cylindrical structure, with a flux nozzle installed at the front end and sealed by a piston at the rear end. A stepper motor drives the screw rod to rotate forward, thereby pushing the piston forward to compress the paste-type submerged arc welding flux, so that the submerged arc welding flux is dispensed through the flux nozzle to the welding position. By adjusting the rotation speed of the stepper motor, the dispensing rate of the submerged arc welding flux can be controlled. By adjusting the shape of the extrusion outlet of the flux nozzle, the stacking width and thickness of the submerged arc welding flux can be controlled.

[0027] Such as Figures 1-3 , an underwater submerged arc welding device based on submerged arc welding, includes a welding torch 100 and an underwater submerged arc welding flux dispensing system 200. The underwater submerged arc welding flux dispensing system 200 includes a flux propeller 210 and a flux assembly 220. The flux propeller includes a stepper motor 211, a gantry support seat 212, a metal backing plate 213, a screw rod 214, and a push block 215. The flux assembly includes a flux chamber 221, a flux storage cylinder 222, a flux nozzle 223, an annular clamp 224, and a support arm 225. The support arm and the annular clamp can be integrally formed.

[0028] In some preferred embodiments, the underwater submerged arc welding flux dispensing system is made of corrosion-resistant alloy material, which can effectively resist seawater corrosion and ensure long-term stable operation in harsh underwater environments. A ring clamp 224 with a support arm is used to connect between the underwater submerged arc welding flux dispensing system 200 and the welding torch 100. The support arm 225 is fixedly connected to the flux chamber 221 by welding. The fixed position of the clamp can be adjusted up and down along the axial direction of the welding torch to meet the requirements of different dry elongations of the welding wire.

[0029] In some preferred embodiments, the flux chamber 221 has a semi-cylindrical structure, which is convenient for replacing the flux storage cylinder 222. The top and bottom of the flux chamber 221 are circular rings with a hole in the center. The top thickness is not less than 3 mm, and a central hole with internal threads is opened in the center. The central hole threads should match the screw rod 214. The outer diameter of the central hole at the bottom is not less than the outer diameter of the connection port of the flux nozzle 223 + 1 mm.

[0030] In some preferred embodiments, the flux storage cylinder 222 is made of high-strength plastic, which is cheap and light. The structure of the flux storage cylinder 222 is similar to that of a construction structural adhesive tube. The front end is a glue outlet with external threads, and the tail end is a sealed piston. During use, the flux storage cylinder 222 is loaded into the flux chamber 221, and the flux nozzle 223 is installed at the front end of the flux storage cylinder 222. By selecting different shapes of flux nozzles, the ejection form of the paste-type submerged arc welding flux can be controlled to meet the requirements of different welding specifications for the submerged arc welding flux. When the screw rod applies pressure to the piston at the tail end of the flux storage cylinder, the flux in the flux storage cylinder 222 will be evenly pushed out to ensure the stable output of the flux.

[0031] In some preferred embodiments, the upper structure of the underwater submerged arc welding device is a flux feeding assembly 210, which is composed of a stepper motor 211, a gantry support 212, a metal backing plate 213, a central lead screw 214 and a push block 215. On both sides of the gantry support 212 are two parallel metal round rods. The bottoms of the metal round rods are welded and fixed to the top of the flux chamber 221, and the tops are welded and fixed through a metal sheet. The stepper motor 211 is fixed to the metal backing plate 213 by screws, and the metal backing plate 213 is inserted into the gantry support 212 through a round hole. One end of the lead screw 214 is mechanically connected to the stepper motor 211, and the other end passes through the screw hole at the top of the flux chamber 221 and is connected to the push block 215 by a bearing. The stepper motor 211 drives the rotation of the lead screw 214, thereby driving the push block to push the piston at the tail end of the flux storage cylinder 222 linearly, compressing the paste-type submerged arc welding flux, and pushing the flux to spray out along the flux nozzle 223.

[0032] In some preferred embodiments, the prepared paste-type submerged arc welding flux will be pre-packaged into the flux storage cylinder 222 for convenient storage and replacement. Before the underwater operation, first adjust the fixed position of the annular clamp 224 according to the set wire dry elongation, and install the flux nozzle 223 on the flux storage cylinder 222 on land to reduce the underwater operation time. During the operation, first load the flux storage cylinder 222 into the flux chamber 221, rotate the flux storage cylinder 222 to ensure the correct position of the flux nozzle 224, then start the stepper motor, and conduct a pre-placement test of the submerged arc welding flux to ensure the stable and continuous extrusion of the submerged arc welding flux and the extrusion form meets the operation requirements, and complete the flux assembly.

[0033] The underwater submerged arc welding flux placement system is responsible for pre-placing the paste-type submerged arc welding flux in front of the advancing welding arc as needed during the underwater wet submerged arc welding process to ensure the effective protection of the underwater welding arc and molten pool by the submerged arc welding flux. The flux conveying device is mainly composed of a lead screw propulsion structure 210 and a flux chamber 220. By adjusting the rotation speed of the stepper motor 211, the control of the solder conveying speed can be achieved, and further the purpose of controlling the flux coverage thickness in the welding area can be achieved.

[0034] Embodiment 3 This submerged arc welding device underwater should be used in combination with an automatic traveling mechanism or a robotic arm. During operation, first adjust the position of the submerged arc welding device underwater so that the welding torch is perpendicular to the workpiece surface, and the flux dispensing system is located in front of the welding torch's travel path, with the forward side of the flux nozzle in contact with the workpiece surface. When the submerged arc welding device underwater is started, the stepper motor 211 begins to operate, driving the lead screw 214 to rotate forward. The push block squeezes the piston of the flux storage cylinder 222, pushing the submerged arc welding flux through the flux nozzle and dispensing it onto the weld bead surface. Move the submerged arc welding device underwater forward along the workpiece surface so that the welding wire is immersed in the submerged arc welding flux, and then supply power to the welding circuit to ignite the arc and start the welding operation. The current of the stepper motor should be adjusted as the welding specifications change to ensure that the supply rate of the submerged arc welding flux matches the welding rate. The flux consumption and supply rate can be calculated in real time by monitoring the position of the push block 215. The submerged arc welding device underwater continues to operate until the flux in the flux storage cylinder 222 is exhausted or the welding operation is completed.

[0035] For ease of use, a limit switch can be provided at the bottom of the flux chamber. When the push block moves to the position of the limit switch, the stepper motor stops operating.

[0036] The above embodiments are only for illustrating the inventive concept and features of the present invention, aiming to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and shall not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims

1. An underwater submerged arc welding device based on submerged arc welding, characterized in that: It includes a welding torch, a flux component, a paste submerged arc welding flux, an arm, a clamp, and a flux propeller. The flux component includes a flux chamber, a flux storage cylinder, and a flux nozzle. The paste submerged arc welding flux is stored in the flux storage cylinder, and the flux storage cylinder is placed in the flux chamber. The flux nozzle is arranged at the front end of the flux chamber, and the flux propeller is arranged at the rear end of the flux chamber for extruding the paste submerged arc welding flux in the flux chamber. The flux component is connected to one end of the arm, and the other end of the arm is connected to the clamp. The welding torch is nested in the clamp. The arm adjusts the angle between the axis of the welding torch and the axis of the flux component, and the angle is set between 15° and 45°.

2. The submerged arc welding device for underwater based on submerged arc welding according to claim 1, characterized in that: The arm includes a fixed arm, a rotating arm, and an arm bolt. The rear end of the fixed arm is fixedly connected to the flux component, and the front end of the rotating arm is fixedly connected to the clamp. The front end of the fixed arm is flat and provided with a fixing hole, and the rear end of the rotating arm is flat and provided with a rotating hole. The arm bolt is inserted into the fixing hole and the rotating hole, and the arm bolt is tightened to press the front end of the fixed arm and the rear end of the rotating arm.

3. The underwater submerged arc welding device based on submerged arc welding according to claim 2, characterized in that: A pointer parallel to the axis of the flux component is arranged outside the fixing hole, and an angle adjustment scale is arranged outside the rotating hole. The angle adjustment scale cooperates with the pointer to adjust the angle of the angle, and the angle is set to 30°.

4. The underwater submerged arc welding device based on submerged arc welding according to claim 1, characterized in that: The flux propeller includes a stepping motor, a gantry support seat, a lead screw, a backing plate, and a pushing block. The gantry support seat is fixed outside the flux chamber, the backing plate is slidably connected to the gantry support seat, the stepping motor is fixed on the backing plate, one end of the lead screw is connected to the output end of the stepping motor, and the other end passes through the top of the flux chamber and presses against the pushing block. The pushing block abuts against the flux storage cylinder, and a central hole thread is arranged at the top of the flux chamber, and the lead screw is screwed into the central hole thread.

5. The underwater submerged arc welding device based on submerged arc welding according to claim 4, characterized in that: The gantry support seat includes two parallel round bars, the bottom ends of the round bars are vertically fixed on the top of the flux chamber, and the top ends of the round bars are fixedly connected by a cross bar.

6. The submerged arc welding device underwater based on submerged arc welding according to claim 5, characterized in that: Plate holes with the same distance from the two parallel round bars are arranged on both sides of the backing plate, and the round bars are sleeved in the plate holes.

7. The underwater submerged arc welding device based on submerged arc welding according to claim 4, characterized in that: A bearing is arranged at the connection between the lead screw and the pushing block. The outside of the bearing is fixedly connected to the pushing block, and the inner hole of the bearing is fixedly connected to the lead screw.

8. The underwater submerged arc welding device based on submerged arc welding according to claim 1, characterized in that: The flux nozzle is made of corrosion-resistant metal as a whole, and the distance between the flux nozzle and the axis of the conductive nozzle of the welding torch is not less than 10 mm.

9. An underwater submerged arc welding machine, comprising an underwater automatic traveling mechanism or an underwater robotic arm, characterized in that: The underwater automatic walking mechanism or the underwater robotic arm is provided with the underwater submerged arc welding device based on submerged arc welding according to any one of claims 1-8.

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