Method for controlling welding deformation of power transformer oil tank transportation bracket

Abstract

The invention relates to the technical field of power transformer oil tank welding, in particular to a method for controlling welding deformation of a power transformer oil tank transportation bracket. According to the technical scheme, the method for controlling the welding deformation of the transportation bracket of the power transformer oil tank comprises a fixed plate pre-bending method; compared with a traditional method for controlling welding deformation of a transportation bracket of a power transformer oil tank and a common sampling gas metal arc welding method, the use requirement can be met only by manually carrying out flame shaping for multiple times in the post-welding shaping work of the transportation bracket, meanwhile, the flame shaping method needs to consume large manpower and material resources, the working efficiency is low, and the labor intensity is low. According to the method for controlling the welding deformation of the power transformer oil tank transportation bracket, mechanical pre-bending treatment is conducted on the fixing plate through an oil press, the welding deformation is actively controlled in a pre-bending anti-deformation mode, the stability of a welding structure is enhanced, a segmented same-direction welding technology is adopted, the welding deformation is further reduced, and the welding quality is improved. Therefore, the working efficiency is obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of power transformer oil tank welding, and in particular to a method for controlling welding deformation of a power transformer oil tank transport bracket. Background Art

[0002] When transporting large oil-immersed power transformers by road or rail, the transformer's overall dimensions, transportation weight and transportation method must be considered. For power transformers with larger overall height dimensions, several transport brackets are set on the upper part of the transformer tank, and the transport height is lowered through the support of the transport brackets and the crossbeams of the transport vehicle to meet the transportation requirements. The transport brackets are usually evenly welded on the upper part of the long axis of the transformer tank and bear a large load-bearing capacity during transportation. The transport bracket structure is welded with thick steel plates and several reinforced iron corners. The transport bracket needs to ensure sufficient welding strength. Due to the large welding heat input and the uneven distribution of the welding temperature field, the bracket will produce large plane deformation and angular deformation after welding.

[0003] The existing method for controlling welding deformation of the oil tank transport bracket of the power transformer generally adopts the gas shielded arc welding method. Usually, the post-welding shaping work of the transport bracket requires multiple manual flame shaping to meet the use requirements, and the shaping effect is not ideal. At the same time, the flame shaping method consumes a lot of manpower and material resources and has low work efficiency.

[0004] In view of the problems that the existing method for controlling the welding deformation of the oil tank transport bracket of the power transformer requires multiple manual flame shaping to meet the use requirements, the shaping effect is not ideal, and the flame shaping method consumes a lot of manpower and material resources and has low work efficiency, the method for controlling the welding deformation of the oil tank transport bracket of the power transformer uses a hydraulic press to perform mechanized pre-bending treatment on the fixed plate, actively controls the welding deformation in a pre-bending reverse deformation manner, enhances the stability of the welding structure through spot welding fixation of the transverse flat steel and the oblique flat steel, and adopts a segmented same-direction welding process to further reduce the welding deformation, mechanized pre-bending and spot welding fixation reduce the workload of manual shaping, and segmented welding also increases the welding speed, thereby significantly improving work efficiency. Summary of the invention

[0005] In order to overcome the existing method of controlling welding deformation of the power transformer oil tank transport bracket, the general method adopts the metal-metal gas shielded welding method. Usually, the post-welding shaping work of the transport bracket requires multiple manual flame shaping to meet the use requirements, and the shaping effect is not ideal. At the same time, the flame shaping method consumes a lot of manpower and material resources and has low work efficiency.

[0006] The technical solution of the present invention is: a method for controlling welding deformation of a power transformer oil tank transport bracket, comprising the following steps:

[0007] S11: Firstly, various materials required for welding of the oil tank transport bracket for the control power transformer are prepared and inspected;

[0008] S12: pre-bending the fixing plate according to the conditions of the intended welded parts;

[0009] S13: Electric welding is performed on the reinforcing iron;

[0010] S14: Positioning spot welding horizontal flat steel;

[0011] S15: Positioning spot welding inclined flat steel;

[0012] S16: Check the welding equipment and spot welding parts;

[0013] S17: After the inspection is completed, welding is performed in sections in the same direction;

[0014] S18: Cooling and removing the limiting flat steel;

[0015] S19: Perform quality inspection on the welded transport bracket.

[0016] Preferably, when preparing materials, the following steps are included:

[0017] S21: Prepare the required materials such as fixing plate, reinforcing iron, horizontal flat steel, diagonal flat steel, etc.;

[0018] S22: Ensure that the quality of all materials meets welding requirements.

[0019] Preferably, when performing pre-bending of the fixing plate, the following steps are included:

[0020] S31: Pre-bending the fixed plate by using hydraulic equipment;

[0021] S32: The amount of pre-bending is determined by the number of reinforcement irons of the intended welded parts and the length of the intended weld, usually 3-5mm.

[0022] Preferably, when performing the reinforced iron spot welding, the following steps are included:

[0023] S41: Spot weld all the reinforcing irons to the pre-bent fixing plate according to the established requirements;

[0024] S42: Ensure that the spot welding is firm and there are no cold welds or leaking welds.

[0025] Preferably, when spot welding the horizontally drawn flat steel, the following steps are included:

[0026] S51: spot welding the horizontally stretched flat steel to the upper end of the reinforcing iron along the length direction of the reinforcing iron;

[0027] S52: Determine the layout of the reinforcement iron and the length of the weld according to the number and position of the horizontal flat steel.

[0028] Preferably, when spot welding the inclined flat steel, the following steps are included:

[0029] S61: The inclined flat steel is spot welded to the reinforcing iron along the diagonal direction of the reinforcing iron;

[0030] S62: Check for welding errors.

[0031] Preferably, the pre-welding inspection includes the following steps:

[0032] S71: Check whether all spot welding parts are firm;

[0033] S72: Check whether welding equipment, welding materials, etc. are ready.

[0034] Preferably, when welding, the following steps are included:

[0035] S81: Weld the weld seams of the reinforcing iron and one side of the fixing plate respectively along the same direction;

[0036] S82: Check welding quality to avoid defects such as slag inclusion and lack of fusion;

[0037] S83: Welding the other side weld between the reinforcing iron and the fixing plate in the same direction as the first side weld;

[0038] S84: Control welding speed and temperature to reduce heat input and welding deformation.

[0039] Preferably, when cooling and removing the limiting flat steel, the following steps are included:

[0040] S91: After welding is completed, wait for the weld position to cool to room temperature;

[0041] S92: Remove the horizontal and diagonal flat steels to complete the welding and production of the transport bracket.

[0042] Preferably, the quality inspection includes the following steps:

[0043] S1001: Perform quality inspection on the welded transport bracket, including appearance inspection, dimension measurement, deformation detection, etc.;

[0044] S1002: Check whether the transport bracket meets the design requirements and usage requirements.

[0045] Beneficial effects of the present invention:

[0046] 1. By using a hydraulic press to perform mechanized pre-bending on the fixed plate, the welding deformation is actively controlled by pre-bending and reverse deformation. The stability of the welded structure is enhanced by spot welding the transverse flat steel and the oblique flat steel. The segmented same-direction welding process is adopted to further reduce the welding deformation. The mechanized pre-bending and spot welding fixation reduce the workload of manual shaping. The segmented welding also increases the welding speed, thereby significantly improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Shown is a schematic diagram of the working process of a method for controlling welding deformation of a power transformer oil tank transport bracket of the present invention;

[0048] Figure 2 Shown is a schematic diagram of a welding process of a method for controlling welding deformation of a power transformer oil tank transport bracket of the present invention;

[0049] Figure 3 Shown is a schematic diagram of the position of the hydraulic press of the present invention;

[0050] Figure 4 Shown is a schematic diagram of fixed-point welding of the present invention;

[0051] Figure 5 Shown is the formal welding schematic diagram of the present invention.

[0052] Explanation of the accompanying drawings: 1. Fixed plate; 2. Reinforcement iron; 3. Horizontal flat steel; 4. Diagonal flat steel. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0054] See also Figure 1-2 The present invention provides an embodiment: a method for controlling welding deformation of a power transformer oil tank transport bracket, comprising the following steps:

[0055] S11: Firstly, various materials required for welding of the oil tank transport bracket for the control power transformer are prepared and inspected;

[0056] S12: pre-bending the fixing plate according to the conditions of the intended welded parts;

[0057] S13: Electric welding is performed on the reinforcing iron;

[0058] S14: Positioning spot welding horizontal flat steel;

[0059] S15: Positioning spot welding inclined flat steel;

[0060] S16: Check the welding equipment and spot welding parts;

[0061] S17: After the inspection is completed, welding is performed in sections in the same direction;

[0062] S18: Cooling and removing the limiting flat steel;

[0063] S19: Perform quality inspection on the welded transport bracket.

[0064] Preferably, when preparing materials, the following steps are included:

[0065] S21: Prepare the required materials such as fixing plate, reinforcing iron, horizontal flat steel, diagonal flat steel, etc.;

[0066] S22: Ensure that the quality of all materials meets welding requirements.

[0067] Preferably, when performing the pre-bending of the fixing plate, the following steps are included:

[0068] S31: Pre-bending the fixed plate by using hydraulic equipment;

[0069] S32: The amount of pre-bending is determined by the number of reinforcement irons of the intended welded parts and the length of the intended weld, usually 3-5mm.

[0070] Preferably, when performing the reinforced iron spot welding, the following steps are included:

[0071] S41: Spot weld all the reinforcing irons to the pre-bent fixing plate according to the established requirements;

[0072] S42: Ensure that the spot welding is firm and there are no cold welds or leaking welds.

[0073] Preferably, when spot welding the horizontally drawn flat steel, the following steps are included:

[0074] S51: spot welding the horizontally stretched flat steel to the upper end of the reinforcing iron along the length direction of the reinforcing iron;

[0075] S52: Determine the layout of the reinforcement iron and the length of the weld according to the number and position of the horizontal flat steel.

[0076] Preferably, when spot welding the inclined flat steel, the following steps are included:

[0077] S61: The inclined flat steel is spot welded to the reinforcing iron along the diagonal direction of the reinforcing iron;

[0078] S62: Check for welding errors.

[0079] Preferably, the pre-welding inspection includes the following steps:

[0080] S71: Check whether all spot welding parts are firm;

[0081] S72: Check whether welding equipment, welding materials, etc. are ready.

[0082] Preferably, when welding, the following steps are included:

[0083] S81: Weld the weld seams of the reinforcing iron and one side of the fixing plate respectively along the same direction;

[0084] S82: Check welding quality to avoid defects such as slag inclusion and lack of fusion;

[0085] S83: Welding the other side weld between the reinforcing iron and the fixing plate in the same direction as the first side weld;

[0086] S84: Control welding speed and temperature to reduce heat input and welding deformation.

[0087] Preferably, when cooling and removing the limiting flat steel, the following steps are included:

[0088] S91: After welding is completed, wait for the weld position to cool to room temperature;

[0089] S92: Remove the horizontal and diagonal flat steels to complete the welding and production of the transport bracket.

[0090] Preferably, the quality inspection includes the following steps:

[0091] S1001: Perform quality inspection on the welded transport bracket, including appearance inspection, dimension measurement, deformation detection, etc.;

[0092] S1002: Check whether the transport bracket meets the design requirements and usage requirements.

[0093] Example 1

[0094] When welding deformation of the oil tank transport bracket of the oil-immersed power transformer is controlled:

[0095] 1. According to Figure 3 The fixing plate 1 is pre-bent by using hydraulic equipment, and the amount of pre-bending is determined by the number of reinforcing irons 2 to be welded.

[0096] 2. According to Figure 4 The reinforcing iron 2 is spot welded to the fixing plate 1 according to the established requirements.

[0097] 3. Spot weld the horizontal flat steel 3 to the upper end of the reinforcing iron 2 along the length direction of the reinforcing iron 2.

[0098] 4. Spot weld the inclined flat steel 4 to the reinforcing iron 2 along the diagonal direction of the reinforcing iron 2.

[0099] 5. According to Figure 5Formal welding is performed. First, the weld 1 on one side of the reinforcing iron 2 and the fixing plate 1 is welded in the same direction, and the weld 2 on the other side between the reinforcing iron 2 and the fixing plate 1 is welded in the same direction as the weld 1 on the first side.

[0100] 6. After welding, wait for the transport bracket to cool to room temperature, then remove the horizontal flat steel 3 and the diagonal flat steel 4 to complete the welding and production of the transport bracket.

[0101] The pre-bending of the fixing plate is performed along the length direction of the fixing plate.

[0102] The pre-bending deformation of the fixing plate 1 matches the number of reinforcement irons 2 to be welded and the length of the weld to be welded.

[0103] The horizontal flat steel 3 and the inclined flat steel 4 are matched with the length of the reinforcement iron to be welded and the length of the bevel angle.

[0104] The welding is performed in the same direction.

[0105] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A method for controlling welding deformation of a power transformer oil tank transport bracket, characterized in that: The following steps are included: S11: Firstly, various materials required for welding of the oil tank transport bracket of the control power transformer are prepared and inspected; S12: pre-bending the fixing plate according to the conditions of the intended welded parts; S13: Electric welding is performed on the reinforcing iron; S14: Positioning spot welding horizontal flat steel; S15: Positioning spot welding inclined flat steel; S16: Check the welding equipment and spot welding parts; S17: After the inspection is completed, welding is performed in sections in the same direction; S18: Cooling and removing the limiting flat steel; S19: Perform quality inspection on the welded transport bracket.

2. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 1, characterized in that: The following steps are included in the material preparation: S21: Prepare the materials required for fixing plate, reinforcing iron, horizontal flat steel and diagonal flat steel; S22: Ensure that the quality of all materials meets welding requirements.

3. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 2, characterized in that: When pre-bending the fixed plate, the following steps are included: S31: Pre-bending the fixed plate by using hydraulic equipment; S32: The amount of pre-bending is determined by the number of reinforcement irons of the intended welded parts and the length of the intended weld, usually 3-5mm.

4. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 3, characterized in that: When performing reinforced iron spot welding, the following steps are included: S41: Spot weld all the reinforcing irons to the pre-bent fixing plate according to the established requirements; S42: Ensure that the spot welding is firm and there are no cold welds or leaking welds.

5. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 4, characterized in that: When spot welding horizontal flat steel, the following steps are included: S51: spot welding the horizontally stretched flat steel to the upper end of the reinforcing iron along the length direction of the reinforcing iron; S52: Determine the layout of the reinforcement iron and the length of the weld according to the number and position of the horizontal flat steel.

6. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 5, characterized in that: When spot welding the inclined flat steel, the following steps are included: S61: The inclined flat steel is spot welded to the reinforcing iron along the diagonal direction of the reinforcing iron; S62: Check for welding errors.

7. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 6, characterized in that: When performing a pre-welding inspection, the following steps are included: S71: Check whether all spot welding parts are firm; S72: Check whether welding equipment and welding materials are ready.

8. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 7, characterized in that: When welding, the following steps are included: S81: Weld the weld seams of the reinforcing iron and one side of the fixing plate respectively along the same direction; S82: Check welding quality to avoid slag inclusion, lack of fusion and defects; S83: Welding the other side weld between the reinforcing iron and the fixing plate in the same direction as the first side weld; S84: Control welding speed and temperature to reduce heat input and welding deformation.

9. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 8, characterized in that: When cooling and removing the limit flat steel, the following steps are included: S91: After welding is completed, wait for the weld position to cool to room temperature; S92: Remove the horizontal and diagonal flat steels to complete the welding and production of the transport bracket.

10. A method for controlling welding deformation of a power transformer oil tank transport bracket according to claim 9, characterized in that: During quality inspection, The following steps are involved: S1001: Perform quality inspection on the welded transport bracket, including appearance inspection, dimension measurement, and deformation detection; S1002: Check whether the transport bracket meets the design requirements and usage requirements.

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