A welding strip preheating device with a cladding welding gun

Abstract

A kind of welding strip preheating device of strip electrode surfacing welding gun.The present application includes strip electrode surfacing head, flux hopper, welding strip, conductive nozzle, the lower part of strip electrode surfacing head is provided with preheating device, welding strip vertically downward along the conductive nozzle of strip electrode surfacing head enters the gap between fixed heat insulation board and adjustable heat insulation board of preheating device, flux hopper is arranged at the both sides of the lower end of preheating device;The connecting plate, fixed heat insulation board, adjustable heat insulation board and cover plate of preheating device are sequentially arranged along the transverse direction;Connecting plate, cover plate and strip electrode surfacing head are fixedly connected.The beneficial effects are that the structure design is reasonable, easy to operate, can effectively increase the dry extension length of welding strip, effectively preheat welding strip using the resistance heat of dry extension length part of welding strip, significantly improve the cladding speed of welding strip per unit current, improve the surfacing speed, realize the purposes of reducing welding line energy, improving the cooling speed of surfacing layer, reducing the dilution rate of base material, improving the mechanical properties and metallographic structure of surfacing layer and heat affected zone.

Description

Technical Field

[0001] This invention relates to a strip electrode welding apparatus, and more particularly to a strip preheating device for a strip electrode welding torch, belonging to the field of mechanical engineering fusion welding technology. Background Technology

[0002] Existing strip electrode welding torches utilize ordinary plate electrodes. The weld strip passes between two plate electrodes, using a normal weld strip extension length. The extension length for submerged arc strip electrode welding is generally between 20 and 35 mm. Ordinary plate electrodes have a simple structure, compact size, and mature application. However, these ordinary plate electrodes have high heat input, low weld strip deposition efficiency, and a base material dilution rate generally greater than 20%. Therefore, this ordinary plate electrode strip electrode welding process is suitable for high heat input and low speed welding, but not for low heat input and high speed welding. Summary of the Invention

[0003] In order to overcome the shortcomings of the ordinary plate electrodes used in existing strip welding equipment, which are not suitable for low line energy and high-speed welding, the present invention provides a strip preheating device for a strip welding torch.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a strip preheating device for a strip welding torch, comprising a strip welding head, a flux hopper, a welding strip, and a conductive nozzle, characterized in that: a preheating device is provided below the strip welding head, the welding strip enters the preheating device vertically downward along the conductive nozzle of the strip welding head, and the welding strip enters the gap between the fixed heat insulation plate and the adjustable heat insulation plate of the preheating device downward, and the flux hopper is provided on both sides of the lower end of the preheating device.

[0005] The preheating device consists of a connecting plate, a fixed heat insulation plate, an adjustable heat insulation plate, and a cover plate arranged in a transverse direction; the connecting plate and the cover plate are fixedly connected to the strip welding head.

[0006] The fixed heat insulation plate is fixedly connected to the connecting plate; the adjustable heat insulation plate is connected to the cover plate.

[0007] The two flux hoppers are respectively located on the outside of the connecting plate and the cover plate.

[0008] The outer sides of the connecting plate and the cover plate are respectively provided with flux hopper connecting devices; the flux hopper connecting devices are connected to the connecting plate / cover plate by connecting bolts, and the connecting bolts are provided with insulating sleeves to insulate the flux hopper connecting plate, flux hopper and electrode surfacing head.

[0009] Two stepped outer circular insulating sleeves I are provided between the flux hopper connecting plate and the connecting plate / cover plate on the connecting bolt; the small shaft ends of the two insulating sleeves I are arranged facing each other, and the outer circle of the small shaft of the insulating sleeve I is provided with a sleeve.

[0010] An insulating sleeve II is provided between the connecting bolt and the flux hopper connecting plate; two insulating sleeves I and insulating sleeve II are connected axially in sequence.

[0011] The adjustable heat insulation plate and the cover plate are connected by adjusting bolts and adjusting nuts.

[0012] The adjustable heat insulation board has a T-slot on its side, and the gap between the adjustable heat insulation board and the fixed heat insulation board can be adjusted by adjusting the nut.

[0013] The fixed and adjustable heat insulation boards are insulating mica boards.

[0014] The beneficial effects of this invention are that it has a reasonable structural design, is easy to operate, can effectively increase the weld strip extension length, effectively preheat the weld strip by utilizing the resistance heat of the extended portion of the weld strip, significantly improve the cladding speed of the weld strip per unit current, increase the welding speed, and achieve the goals of reducing welding line energy, increasing the cooling rate of the weld overlay, reducing the base material dilution rate, and improving the mechanical properties and metallographic structure of the weld overlay and heat-affected zone. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the strip preheating device of the strip welding torch of the present invention.

[0016] Figure 2 This is a schematic diagram of the connection of the adjustable heat insulation board in this invention.

[0017] Figure 3 This is a schematic diagram of the flux hopper connecting device in this invention.

[0018] In the diagram: 1. Electrode welding head, 2. Connecting plate, 3. Fixed heat insulation plate, 4. Adjustable heat insulation plate, 5. Cover plate, 6. Flux hopper connecting device, 7. Flux hopper, 8. Welding strip, 9. Preheating device, 10. Insulating sleeve I, 11. Sleeve, 12. Flux hopper connecting plate, 13. Insulating sleeve II, 14. Connecting bolt, 15. Adjusting bolt, 16. Adjusting nut, 17. Conductive nozzle, 18. Frame. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "seal" should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium; it can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] See appendix Figure 1 This invention discloses a strip welding torch preheating device, comprising a strip welding head 1, a flux hopper 7, and a strip preheating device 9. The preheating device 9 is located below the strip welding head 1. The strip 8 enters the preheating device 9 vertically downwards along the conductive nozzle 17 of the strip welding head 1, and then enters the gap between a fixed heat-insulating plate 3 and an adjustable heat-insulating plate 4. Two flux hoppers 7 are located on both sides of the lower end of the preheating device 9. Preferably, the fixed heat-insulating plate 3 and the adjustable heat-insulating plate 4 are insulating mica plates. The welding strip 8 between the fixed heat insulation plate 3 and the adjustable heat insulation plate 4 is the extended part of the welding strip. The fixed heat insulation plate 3 and the adjustable heat insulation plate 4 use wear-resistant, high-temperature resistant, and insulating mica plates as straighteners for the large extension welding strip to ensure that the large extension welding strip is reliably aligned with the conductive nozzle 17. The resistance of the extension part of the welding strip also increases accordingly. The heat generated by the resistance is used to preheat the welding strip.

[0023] The preheating device 9 includes a connecting plate 2, a fixed heat insulation plate 3, an adjustable heat insulation plate 4, a cover plate 5, and a flux hopper connecting device 6. The connecting plate 2, the fixed heat insulation plate 3, the adjustable heat insulation plate 4, and the cover plate 5 are arranged in a transverse direction. The connecting plate 2 and the cover plate 5 are connected to the strip electrode welding head 1. Preferably, the connecting plate 2 and the cover plate 5 are fixedly connected to the frame 18 of the strip electrode welding head 1.

[0024] See appendix Figure 2 , 3The fixed heat insulation plate 3 is fixedly connected to the connecting plate 2; the adjustable heat insulation plate 4 is connected to the cover plate 5. The adjustable heat insulation plate 4 and the cover plate 5 are connected by adjusting bolts 15 and adjusting nuts 16. Preferably, the adjustable heat insulation plate 4 and the cover plate 5 are provided with T-slots on adjacent sides, and one end of the adjusting bolt 15 is provided in the T-slot on the side. The adjusting bolt 15 passes through the cover plate 5, and the gap between the adjustable heat insulation plate 4 and the fixed heat insulation plate 3 is adjusted by adjusting nuts 16. This can meet the requirements of welding strips of different thicknesses, and also ensure that the welding strip can be fed smoothly and without bending deformation, solving the problem of unstable delivery of welding strips under large elongation conditions.

[0025] The flux hoppers 7 are respectively located on the outside of the connecting plate 2 and the cover plate 5 (e.g., Figure 1 As shown, flux hopper connecting devices 6 are respectively provided on the outer sides of the connecting plate 2 and the cover plate 5; the two flux hopper connecting devices 6 are connected to the connecting plate 2 / cover plate 5 by connecting bolts 14, and the connecting bolts 14 are perpendicular to the connecting plate 2 / cover plate 5. The connecting bolts 14 are provided with insulating sleeves to insulate the flux hopper connecting plate 12, the flux hopper 7 and the strip electrode welding head 1. Furthermore, the flux hopper 7 is fixedly connected to the flux hopper connecting plate 12 by bolts, and the flux hopper 7 moves together with the strip electrode welding head 1 to ensure a stable supply of flux and ensure the continuity and stability of the additive manufacturing process.

[0026] The connecting bolt 14 is provided with two insulating sleeves I10 and one insulating sleeve II13, and the outer circles of the insulating sleeves I10 and II13 are both stepped shafts.

[0027] Two insulating sleeves I 10 are provided between the flux hopper connecting plate 12 on the connecting bolt 14 and the connecting plate 2 / cover plate 5; the small shaft ends of the two insulating sleeves I 10 are arranged facing each other, and a sleeve 11 is provided on the outer circle of the small shaft of the insulating sleeve I 10. An insulating sleeve II 13 is provided between the connecting bolt 14 and the flux hopper connecting plate 12. The two insulating sleeves I 10 and the insulating sleeve II 13 are axially connected in sequence.

[0028] This invention discloses a strip preheating device for a strip electrode welding torch. Installed at the outlet of the electrode (conductive nozzle) of a conventional strip electrode welding torch, the welding strip extends from the electrode outlet into the gap between a fixed and an adjustable heat-insulating plate. This effectively increases the length of the welding strip extending from the electrode outlet. As the welding strip length increases, the resistance increases accordingly, and the extended portion of the welding strip is preheated, thereby improving the welding strip deposition efficiency. This achieves the effect of reducing welding heat input by increasing the strip electrode deposition speed and welding speed or reducing the welding current, thereby increasing the cooling rate of the weld overlay, reducing the base metal dilution rate, and improving the mechanical properties and metallographic structure of the weld overlay and heat-affected zone. This invention is applicable to various welding methods, such as submerged arc welding, electroslag welding, and other consumable electrode welding methods.

[0029] It should be noted that the above embodiments are examples and not limitations of the invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A strip welding torch with a strip preheating device, comprising a strip welding head, a flux hopper, a welding strip, and a contact tip, characterized in that: A preheating device is provided below the strip welding head. The welding strip enters the preheating device vertically downward along the conductive nozzle. The welding strip enters the gap between the fixed heat insulation plate and the adjustable heat insulation plate of the preheating device. The flux hopper is set on both sides of the lower end of the preheating device. The preheating device consists of a connecting plate, a fixed heat insulation plate, an adjustable heat insulation plate, and a cover plate arranged in a transverse direction; the connecting plate and the cover plate are fixedly connected to the strip welding head. The fixed heat insulation plate is fixedly connected to the connecting plate; the adjustable heat insulation plate is connected to the cover plate. Two flux hoppers are respectively located on the outside of the connecting plate and the cover plate; The outer sides of the connecting plate and the cover plate are respectively provided with flux hopper connecting devices; the flux hopper connecting devices are connected to the connecting plate or the cover plate by connecting bolts, and the connecting bolts are provided with insulating sleeves to insulate the flux hopper connecting plate, the flux hopper and the electrode stacking head. Two stepped outer circular insulating sleeves I are provided between the flux hopper connecting plate and the connecting plate or cover plate on the connecting bolt; the small shaft ends of the two insulating sleeves I are arranged facing each other, and a sleeve is provided on the outer circle of the small shaft of the insulating sleeve I; An insulating sleeve II is provided between the connecting bolt and the flux hopper connecting plate; two insulating sleeves I and insulating sleeve II are connected axially in sequence.

2. The strip welding torch with a strip preheating device according to claim 1, characterized in that: The adjustable heat insulation plate and the cover plate are connected by adjusting bolts and adjusting nuts.

3. A strip welding torch with a strip preheating device according to claim 2, characterized in that: The adjustable heat insulation board has a T-slot on its side, and the gap between the adjustable heat insulation board and the fixed heat insulation board can be adjusted by adjusting the nut.

4. A strip welding torch with a strip preheating device according to claim 1, characterized in that: The fixed and adjustable heat insulation boards are insulating mica boards.

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