Panel welding method

Abstract

This invention belongs to the field of large component splicing technology and discloses a method for welding spliced ​​plates, including: S1, opening a V-shaped bevel on a first and a second plate to be welded, the angle of the V-shaped bevel being 15-20°; S2, welding on the front side of the V-shaped bevel; S3, using welding material and a welding torch to weld the first and second plates to be welded along the V-shaped bevel, the welding torch being connected to a power controller, the power controller being connected to a first power supply and a second power supply, the first power supply being able to output a first voltage of 10-30V, the second power supply being able to output a second voltage of 40-60V, in the first state the welding torch is connected to the first power supply, in the second state the welding torch is connected to the second power supply, the power controller controlling the switching frequency of the first and second states to adjust the average voltage and average current of the welding torch; the V-shaped bevel has a small slope, the amount of welding material filling is small, the welding efficiency is high, the low and high voltages change intermittently, single-sided welding achieves double-sided forming, eliminating the need for flipping the welding plate, saving steps.

Description

Technical Field

[0001] This invention relates to the field of large component splicing technology, and in particular to a method for welding spliced ​​plates. Background Technology

[0002] In the assembly of large structural components in fields such as shipbuilding and steel structures, there are numerous butt welds on the plates during the assembly stage, resulting in a large volume of work. Traditional plate welding methods include FGB, FCB, and submerged arc welding. FGB welding requires manual application of iron powder and the placement of backings on the back of the plates to be joined. FCB welding is efficient and easy to operate, but equipment is limited, allowing only welds perpendicular to the assembly line. Furthermore, due to the high heat input, it is difficult to weld medium-thick plates of 8-14mm. Submerged arc welding performs single-sided welding on the plates, but the back of the plates is difficult to shape, requiring carbon arc gouging or grinding of the back welds to remove slag or unfused metal. Welding the back welds of the plates involves many steps, affecting overall construction efficiency.

[0003] Furthermore, in order to ensure weld penetration, the conventional welding method described above requires a large welding slope for the spliced ​​plates, resulting in a large filler volume and a large consumption of welding materials and heat energy.

[0004] Therefore, a solution to the above problems is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a panel welding method that has a small filling amount, high welding efficiency, single-sided welding with double-sided forming, and saves process steps.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A panel welding method for welding a first and a second plate to be welded includes the following steps:

[0008] S1. Pre-welding treatment: V-shaped grooves are opened on the first and second plates to be welded, and the angle of the V-shaped grooves is 15-20°.

[0009] S2. Assemble and position the components, and weld on the front side of the V-groove.

[0010] S3. Start welding. Use welding materials to weld the first and second plates to be welded along the V-groove using a welding torch. The welding torch is connected to a power controller, which is connected to a first power supply and a second power supply. The first power supply can output a first voltage, which is 10-30V. The second power supply can output a second voltage, which is 40-60V. The welding torch has a first state and a second state. In the first state, the welding torch is connected to the first power supply. In the second state, the welding torch is connected to the second power supply. The power controller is configured to control the switching frequency between the first state and the second state to adjust the average voltage and average current of the welding torch.

[0011] Preferably, the welding material comprises 0.040%-0.060% C, 0.650%-0.780% Si, 0.900%-1.200% Mn, 0.009%-0.015% P, 0.006%-0.008% S, 0.020%-0.028% Cr, 0.330%-0.390% Mo, 1.100%-1.450% Ni, 0.010%-0.0160% Cu, and 0.008%-0.014% V by mass.

[0012] Preferably, S1 includes:

[0013] S1.1. Make a bevel, cut the first welding surface of the first plate to be welded and the second welding surface of the second plate to be welded, and the first welding surface and the second welding surface form the V-shaped bevel;

[0014] S1.2 Pre-welding cleaning: Clean the V-groove and the impurities within 20mm on both sides of the V-groove.

[0015] Preferably, S2 includes:

[0016] S2.1 Pre-welding: CO2 gas shielded welding is used to weld on the front side of the V-groove, and multiple tack welds are formed at intervals. The thickness of the tack welds is 4-5mm.

[0017] S2.2. Assemble the arc-extinguishing plate, with the arc-extinguishing plate connected to both ends of the V-shaped bevel.

[0018] Preferably, S2.2 includes

[0019] S2.2.1. Prepare the arc extinguishing plate, wherein the arc extinguishing plate has air gouging grooves along its length direction, and the air gouging grooves extend from one end of the arc extinguishing plate to the other end;

[0020] S2.2.2 Welding the arc-starting and extinguishing plates, with the air-gouging groove aligned with the V-shaped bevel, and using CO2 gas shielded welding to weld the two arc-starting and extinguishing plates to the two ends of the V-shaped bevel respectively.

[0021] Preferably, in step S3, the welding speed of the welding torch is 15-60 cm / min, and when the thickness of both the first and second plates to be welded is 5-10 mm, the average voltage is 30-45 V and the average current is 430-530 A; when the thickness of both the first and second plates to be welded is 10-20 mm, the average voltage is 35-48 V and the average current is 480-550 A; when the thickness of both the first and second plates to be welded is 20-30 mm, the average voltage is 40-50 V and the average current is 500-600 A.

[0022] Preferably, it also includes:

[0023] S4. Cut the arc-extinguishing plate by flame cutting or plasma cutting.

[0024] Preferably, the thickness of the arc-extinguishing plate is the same as the thickness of the first plate to be welded and the second plate to be welded.

[0025] Preferably, the welding torch is a water-cooled welding torch.

[0026] Preferably, the first plate to be welded, the second plate to be welded, and the arc extinguishing plate are all made of steel plate.

[0027] Beneficial Effects: This invention provides a plate welding method for welding a first plate to be welded and a second plate to be welded, comprising the following steps: S1, pre-welding treatment: creating a V-groove on the first and second plates to be welded, the angle of the V-groove being 15-20°; S2, assembly and positioning: welding on the front side of the V-groove; S3, starting welding: using welding materials and a welding torch to weld the first and second plates to be welded along the V-groove, wherein the welding torch is connected to a power controller, the power controller is connected to a first power supply and a second power supply, the first power supply being able to output a first voltage, the first voltage being 10- The second power supply can output a second voltage of 40-60V. The welding torch has a first state and a second state. In the first state, the welding torch is connected to the first power supply, and in the second state, the welding torch is connected to the second power supply. The power controller is configured to control the switching frequency between the first state and the second state to adjust the average voltage and average current of the welding torch. By designing a V-shaped bevel with a small slope, the amount of welding material filling is small during the welding process, resulting in high welding efficiency. Through intermittent low-voltage and high-voltage changes, single-sided welding and double-sided forming can be achieved without the need for flipping welding, saving steps. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the panel welding method provided in an embodiment of the present invention. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the panel welding method provided in an embodiment of the present invention. Figure 2 ;

[0030] Figure 3 This is a schematic flowchart of the panel welding method provided in an embodiment of the present invention.

[0031] In the diagram: 1. First plate to be welded; 2. Second plate to be welded; 3. V-groove; 4. Arc extinguishing plate. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0036] This invention provides a panel welding method for welding a first plate to be welded 1 and a second plate to be welded 2. The welding process requires a small amount of welding material, has high welding efficiency, and can form double-sided shapes with single-sided welding, eliminating the need for flipping welding and saving steps.

[0037] Specifically, such as Figure 3 As shown, it includes the following steps:

[0038] S1. Pre-welding treatment: V-groove 3 is opened on the first plate to be welded 1 and the second plate to be welded 2. The angle of V-groove 3 is 15-20°.

[0039] S2. Assemble and position the components, and weld on the front side of the V-groove 3.

[0040] S3. Start welding. Use welding materials to weld the first plate to be welded 1 and the second plate to be welded 2 along the V-groove 3 using a welding torch. The welding torch is connected to a power controller, which is connected to a first power supply and a second power supply. The first power supply can output a first voltage, which is 10-30V. The second power supply can output a second voltage, which is 40-60V. The welding torch has a first state and a second state. In the first state, the welding torch is connected to the first power supply. In the second state, the welding torch is connected to the second power supply. The power controller is configured to control the switching frequency of the first state and the second state to adjust the average voltage and average current of the welding torch.

[0041] Specifically, S1 includes:

[0042] S1.1. Make a bevel, cut the first welding surface of the first plate to be welded 1 and the second welding surface of the second plate to be welded 2, and form a V-shaped bevel 3 between the first welding surface and the second welding surface.

[0043] S1.2 Pre-welding cleaning: Clean the V-groove 3 and the impurities within 20mm on both sides of the V-groove 3.

[0044] In this embodiment, as Figure 1 As shown, the first welding surface of the first welding plate 1 and the second welding surface of the second welding plate 2 are joined together. Specifically, the first welding plate 1 and the second welding plate 2 have the same thickness. The first welding surface and the second welding surface are cut according to their different thicknesses to form a V-shaped groove 3. The bottom of the V-shaped groove 3 is the welding area. Preferably, the angle of the V-shaped groove 3 is 15-20°, which can effectively reduce the amount of filler and improve the welding efficiency. Furthermore, the oxide layer, rust, moisture, oil and other impurities in the V-shaped groove 3 and within 20mm on both sides of the V-shaped groove 3 are cleaned to prevent impurities from entering the welding area and reducing crack resistance. Specifically, moisture and oil impurities are removed by flame baking, and oxide layer and rust impurities are cleaned by mechanical grinding.

[0045] Preferably, both the first plate to be welded 1 and the second plate to be welded 2 are made of steel plates.

[0046] Specifically, S2 includes:

[0047] S2.1 Pre-welding: CO2 gas shielded welding is used to weld on the front side of the V-groove 3, and multiple tack welds are formed at intervals. The thickness of the tack welds is 4-5mm.

[0048] S2.2. Assemble the arc extinguishing plate 4. Both ends of the V-shaped bevel 3 are connected to the arc extinguishing plate 4.

[0049] In this embodiment, welding needs to be performed at the bottom of the V-groove 3, i.e., the welding area. Specifically, CO2 gas shielded welding is used to perform welding on the front side of the welding area to form multiple locating welds at intervals to prevent the first plate to be welded 1 and the second plate to be welded 2 from shifting in subsequent processes. Preferably, the thickness of the locating weld is 4-5mm. During the welding process, pressure irons or pullers are applied to both sides of the welding area to control deformation.

[0050] Furthermore, S2.2 includes:

[0051] S2.2.1. Prepare an arc extinguishing plate 4. The arc extinguishing plate 4 has air gouging grooves along its length, and the air gouging grooves extend from one end of the arc extinguishing plate 4 to the other end.

[0052] S2.2.2 Welding the arc-starting and extinguishing plates 4, aligning the air-gouging groove with the V-groove 3, and using CO2 gas shielded welding to weld the two arc-starting and extinguishing plates 4 to the two ends of the V-groove 3 respectively.

[0053] Specifically, the arc-extinguishing plate 4, the first weldable plate 1, and the second weldable plate 2 are made of the same steel plate, and the arc-extinguishing plate 4 has the same thickness as the first weldable plate 1 and the second weldable plate 2. In this embodiment, the arc-extinguishing plate 4 has a width of 100mm and a length of 100mm. Air-gouging grooves are formed along the length of the arc-extinguishing plate 4 on its front side using an air-gouging method. Specifically, the air-gouging grooves coincide with the center line of the width of the arc-extinguishing plate 4 and extend from one end of the arc-extinguishing plate 4 to the other end. Further, as... Figure 2 As shown, the gouging groove of the arc extinguishing plate 4 is aligned with the V-groove 3. Specifically, the gouging groove is aligned with the welding area, and the arc extinguishing plate 4 is flush with the first plate to be welded 1 and the second plate to be welded 2. Finally, CO2 gas shielded welding is used to weld the two arc extinguishing plates 4 to the two ends of the V-groove 3 respectively, so as to avoid defects of the arc extinguishing point appearing in the welding area.

[0054] It should be noted that the welding materials used in this embodiment during the welding process include 0.040%-0.060% C (carbon), 0.650%-0.780% Si (silicon), 0.900%-1.200% Mn (manganese), 0.009%-0.015% P (phosphorus), 0.006%-0.008% S (sulfur), and 0. This welding material contains 0.20%-0.028% Cr (chromium), 0.330%-0.390% Mo (molybdenum), 1.100%-1.450% Ni (nickel), 0.010%-0.0160% Cu (copper), and 0.008%-0.014% V (vanadium). Under high heat input, this welding material exhibits good welding performance for welding low-alloy high-strength steels below EH36.

[0055] Specifically, in S3, the output terminal of the power controller is connected to the welding torch, and the input terminal of the power controller can be connected to a first power supply and a second power supply. The first power supply can output a first voltage, which is 10-30V, i.e., a low voltage. The second power supply can output a second voltage, which is 40-60V, i.e., a high voltage. The welding torch has a first state and a second state. In the first state, the welding torch can be connected to the first power supply, and in the second state, the welding torch can be connected to the second power supply. The power controller can control the switching frequency between the first state and the second state, thereby adjusting the average voltage and average current of the welding torch. Through intermittent low-voltage and high-voltage changes, two droplet transfer modes (large droplet transfer and rotating jet transfer) are achieved during welding to improve the penetration depth and ensure stable welding formation. In this embodiment, the switching frequency is 10-50 times / second.

[0056] In this embodiment, the switching frequency is adaptively adjusted according to the thickness of the first board to be soldered 1 and the second board to be soldered 2. Specifically, when the thickness of both the first board to be soldered 1 and the second board to be soldered 2 is 5-10mm, the switching frequency is adjusted so that the average voltage of the welding torch is 30-45V and the average current is 430-530A; when the thickness of both the first board to be soldered 1 and the second board to be soldered 2 is 10-20mm, the switching frequency is adjusted so that the average voltage of the welding torch is 35-48V and the average current is 480-550A; when the thickness of both the first board to be soldered 1 and the second board to be soldered 2 is 20-30mm, the switching frequency is adjusted so that the average voltage of the welding torch is 40-50V and the average current is 500-600A.

[0057] Preferably, the welding torch used in this embodiment is a water-cooled welding torch, which can work for a long time without replacement, reducing the consumption of consumables. Furthermore, since the slope of the V-groove 3 in this embodiment is small, the nozzle of the water-cooled welding torch is small, which is suitable for small groove welds and can penetrate deeper into the groove to ensure root penetration. In addition, the welding speed of the welding torch is 15-60cm / min.

[0058] Furthermore, this embodiment also includes S4, cutting the arc-extinguishing plate 4. Specifically, after the welding is completed, the two arc-extinguishing plates 4 are removed by flame cutting or plasma cutting.

[0059] This embodiment provides a plate welding method for welding a first plate to be welded 1 and a second plate to be welded 2. By designing a V-shaped groove 3 with a small slope, the amount of welding material filling is small during the welding process, resulting in high welding efficiency. Through intermittent low-pressure and high-pressure changes, single-sided welding and double-sided forming can be achieved without the need for flipping welding, thus saving process steps.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method of panel welding for welding a first panel to be welded (1) and a second panel to be welded (2), characterized in that, The method comprises the following steps: S1, pre-welding treatment, V-shaped groove (3) is opened on the first to be welded plate (1) and the second to be welded plate (2), the angle of the V-shaped groove (3) is 15-20°; S2, assembly positioning, welding is carried out on the front surface of the V-shaped groove (3); S3, start welding, the first to be welded plate (1) and the second to be welded plate (2) are welded along the V-shaped groove (3) by using welding material through a welding gun, and the welding gun is connected with a power supply controller, the power supply controller is connected with a first power supply and a second power supply, the first power supply can output a first voltage, the first voltage is 10-30V, the second power supply can output a second voltage, the second voltage is 40-60V, the welding gun has a first state and a second state, in the first state, the welding gun is connected with the first power supply, in the second state, the welding gun is connected with the second power supply, the power supply controller is configured to control the switching frequency of the first state and the second state to adjust the average voltage and the average current of the welding gun, through the intermittent change of low voltage and high voltage, the two kinds of melting drop transition modes of large melting drop transition and rotating jet transition are realized during welding, and the penetration depth can be improved.

2. The panel welding method according to claim 1, characterized by, The welding material comprises C with a mass percentage of 0.040%-0.060%, Si with a mass percentage of 0.650%-0.780%, Mn with a mass percentage of 0.900%-1.200%, P with a mass percentage of 0.009%-0.015%, S with a mass percentage of 0.006%-0.008%, Cr with a mass percentage of 0.020%-0.028%, Mo with a mass percentage of 0.330%-0.390%, Ni with a mass percentage of 1.100%-1.450%, Cu with a mass percentage of 0.010%-0.0160% and V with a mass percentage of 0.008%-0.014%.

3. The plate welding method according to claim 1, characterized by, The S1 comprises: S1.1, opening the groove, cutting the first welding surface of the first to be welded plate (1) and the second welding surface of the second to be welded plate (2), the first welding surface and the second welding surface form the V-shaped groove (3); S1.2, pre-welding cleaning, impurities within 20mm range on both sides of the V-shaped groove (3) are cleaned.

4. The panel welding method according to claim 1, wherein The S2 comprises: S2.1, pre-welding, CO2 gas shielded welding is adopted to weld on the front surface of the V-shaped groove (3), and a plurality of positioning welds are formed at intervals, the thickness of the positioning weld is 4-5mm; S2.2, assembly of arc extinguishing plate (4), the V-shaped groove (3) is connected with the arc extinguishing plate (4) at both ends.

5. The panel welding method according to claim 4, wherein The S2.2 comprises S2.2.1, the arc extinguishing plate (4) is prepared, the air planing groove is opened along the length direction of the arc extinguishing plate (4), and the air planing groove extends from one end of the arc extinguishing plate (4) to the other end; S2.2.2, welding the arc extinguishing plates (4), the gas gouging groove is opposite to the V-shaped groove (3), and two arc extinguishing plates (4) are welded on both ends of the V-shaped groove (3) by adopting CO2 gas shielded welding.

6. The panel welding method according to claim 1, wherein In the S3, the welding speed of the welding gun is 15-60 cm / min, and when the thickness of the first to-be-welded plate (1) and the second to-be-welded plate (2) is 5-10 mm, the average voltage is 30-45 V, and the average current is 430-530 A; when the thickness of the first to-be-welded plate (1) and the second to-be-welded plate (2) is 10-20 mm, the average voltage is 35-48 V, and the average current is 480-550 A; when the thickness of the first to-be-welded plate (1) and the second to-be-welded plate (2) is 20-30 mm, the average voltage is 40-50 V, and the average current is 500-600 A.

7. The plate welding method according to claim 4, wherein Also include: S4, cutting the arc extinguishing plate (4), and cutting off the arc extinguishing plate (4) by adopting flame cutting or plasma cutting.

8. The panel welding method according to claim 4, wherein The thickness of the arc extinguishing plate (4) is the same as that of the first to-be-welded plate (1) and the second to-be-welded plate (2).

9. The panel welding method according to claim 1, wherein The welding gun is a water-cooled welding gun.

10. The plate welding method according to claim 4, wherein The first to-be-welded plate (1), the second to-be-welded plate (2) and the arc extinguishing plate (4) are all made of steel plates.

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