Submerged-arc welding device for medium-thickness steel plate

Abstract

A submerged-arc welding device for a medium-thickness steel plate comprises a base metal splicing mechanism, a base metal gap fine adjustment mechanism, a welding trolley and a trolley track, truncated edges are arranged on a first base metal and a second base metal at a weld joint, the truncated edges are inclined and are slope truncated edges, the truncated edges have truncated edge vertical heights, a base metal gap is formed between the two base metals, and a truncated edge included angle is formed between the two truncated edges. By the adoption of the device, the purposes of single-channel front and back welding of the medium-thickness steel plate, no back gouging and low energy consumption are achieved, and welding efficiency and economical efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to a submerged arc welding device for medium and thick steel plates. Background Technology

[0002] Steel plates with a thickness of 14mm or more are classified as medium-thick steel plates. In existing technologies, submerged arc welding of medium-thick plates commonly employs multi-layer, multi-pass welding, requiring multiple welding passes on both sides and subsequent root cleaning. The disadvantages of this existing technology are: 1. Low efficiency: For example, a 24mm thick steel plate requires 3 passes on the positive side and 2 passes on the negative side, taking up to 26 minutes per meter. 2. High cost: High consumption of welding materials; labor and energy costs account for more than 50% of the total cost. 3. Cumbersome process: Carbon arc gouging is required before negative side welding, which can easily damage the base material and increase the rework rate. 4. Redundant bevel design: Plates thicker than 14mm require additional bevel processing, increasing material preparation time and waste. To address these technical problems, we propose a submerged arc welding device for medium-thick steel plates. Utility Model Content

[0003] The purpose of this utility model is to design the base material structure at the weld. By implementing this utility model, the goal of single-pass positive and negative welding of medium and thick steel plates, root cleaning-free welding, and low energy consumption can be achieved, significantly improving welding efficiency and economy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A submerged arc welding device for medium-thick steel plates includes a base material splicing mechanism, a base material gap fine-tuning mechanism, a welding trolley, and a trolley track. The base material splicing mechanism includes a steel plate moving track, a left support block, and a right support block. The steel plate moving track is mounted on a supporting base frame. The left and right support blocks are movably mounted on the steel plate moving track. The left support block supports a second base material, and the right support block supports a first base material. Both the first and second base materials at the weld joint have blunt edges, which are inclined and sloped. The blunt edges have a vertical height. A base material gap is provided between the two base materials, and an included angle is provided between the two blunt edges. The base material gap fine-tuning mechanism is mounted on the steel plate moving track and drags the first base material left and right. The trolley track is placed on the first or second base material, and the welding trolley moves along the trolley track to perform welding operations.

[0006] The above-mentioned submerged arc welding device for medium and thick steel plates includes a base material gap fine adjustment mechanism comprising a fine adjustment screw, a screw support, a handwheel, and a support block support. The screw support is movably mounted on the steel plate moving track. The fine adjustment screw is mounted on the screw support. The support block support is fixed together with the left support block and the right support block. One end of the fine adjustment screw is fixed to the support block support, and the other end is provided with a handwheel.

[0007] In the aforementioned submerged arc welding device for medium and thick steel plates, the left support block, right support block, and support block bracket can all be locked and positioned using pins and the steel plate moving track.

[0008] The above-mentioned submerged arc welding device for medium and thick steel plates has a blunt edge vertical height of 16-24mm, a base material gap of 1-3mm, and a blunt edge included angle (θ) of 2-10°.

[0009] This utility model has the following advantages:

[0010] This invention relates to a submerged arc welding device for medium-thick steel plates. The device features a 2°~10° angled bevel, reducing the cross-sectional area by 30% and lowering welding material consumption. Simultaneously, it optimizes the arc coverage, ensuring uniform penetration. The welding time per meter is reduced from 26 minutes to 14.3 minutes, increasing efficiency by 45%, reducing welding material consumption by 30~55%, and lowering overall costs by over 30%. Eliminating the root cleaning process reduces energy consumption per meter by 2.3 kWh and dust emissions by 40%. Regarding weld quality, the weld reinforcement fluctuation range using this technology is controlled within 0.5 mm, and the weld width deviation does not exceed 1.2 mm, fully complying with the tolerance requirements for weld geometry in AWS D1.1 Clause 6.3.2. In terms of mechanical properties, this welding technology fully meets welding specifications. Metallographic analysis shows that the average grain size in the heat-affected zone is refined to 5-7 μm, the Vickers hardness gradient changes smoothly, and the impact toughness value is increased by approximately 25%. Taking Q345B steel butt joints as an example, the yield strength of the weld metal is stable in the range of 390-410 MPa, the tensile strength reaches 540-560 MPa, and the elongation after fracture remains above 22%, fully meeting the strength requirements for structural steel welded joints in AWS D1.1 Table 7.1. In the -40℃ low-temperature impact test, the weld metal can still maintain an impact energy of over 54 J, significantly better than the standard requirement of 27 J. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of direction A, without showing the welding trolley.

[0013] Figure 3 It is a structure with no bevel weld;

[0014] Figure 4 It is a structural form with a beveled weld on the reverse side;

[0015] Figure 5 It has a structure with bevel welds on both sides;

[0016] The labels in the diagram represent: 1. Welding trolley, 2. Trolley track, 3. Base material one, 4. Base material two, 5. Steel plate moving track, 6. Left support block, 7. Right support block, 8. Fine adjustment screw, 9. Screw bracket, 10. Handwheel, 11. Support block bracket, 12. Blunt edge, t, Base material thickness, L, Base material gap, θ, Blunt edge angle, L1, Blunt edge vertical height, θ1, Front bevel angle, θ2, Back bevel angle. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] This utility model discloses a submerged arc welding device for medium and thick steel plates, such as... Figure 1 As shown, the system includes a base material splicing mechanism, a base material gap fine-tuning mechanism, a welding trolley 1, and a trolley track 2. The base material splicing mechanism includes a steel plate moving track 5, a left support block 6, and a right support block 7. The base material gap fine-tuning mechanism includes a fine-tuning screw 8, a screw bracket 9, a handwheel 10, and a support block bracket 11. The steel plate moving track 5 is laid on the workshop floor or erected on a support frame. The left support block 6 supports base material 2 4, and the right support block 7 supports base material 1 3. The two base materials move on the steel plate moving track 5, bringing them close together. The handwheel 10 is rotated, and the gap between the two base materials is adjusted by the fine-tuning screw 8. A plug gauge is used for measurement. After the gap is qualified, the trolley track 2 is placed on base material 1 3 or base material 2 4, and the welding trolley 1 is operated to move along the trolley track 2 to perform welding operations.

[0019] This utility model discloses a submerged arc welding device for medium and thick steel plates, such as... Figure 3 As shown, when the thickness t of base material 3 or base material 4 is 16-24mm, the blunt edge angle θ is required to be 2-10°, and the vertical height L1 of the blunt edge is the thickness of the plate. The base material gap is adjusted to 1-3mm using a base material gap fine-tuning mechanism before welding can proceed. The blunt edge angle θ can be directly utilized from the 1° to 5° natural angle generated during material cutting, without additional processing. The preferred natural angle is 3°, with a natural angle error ≤ ±0.5°.

[0020] This utility model discloses a submerged arc welding device for medium and thick steel plates, such as... Figure 4 As shown, when the thickness t of base material 3 or base material 4 is 20-26mm, the blunt edge angle θ is required to be 2-10°, and the vertical height L1 of the blunt edge is 16-24mm. The base material gap is adjusted to 1-3mm using a base material gap fine-tuning mechanism. A bevel is then made on the reverse side, with the bevel angle θ2 set to 75±3°, after which welding can proceed. The blunt edge angle θ can be directly utilized from the 1° to 5° natural angle generated during material cutting, without additional processing. The preferred natural angle is 3°, with a natural angle error ≤±0.5°.

[0021] This utility model discloses a submerged arc welding device for medium and thick steel plates, such as... Figure 5 As shown, when the thickness t of base material 3 or base material 4 is greater than 26mm, a blunt edge is provided in the middle, requiring the blunt edge angle θ to be 2-10° and the vertical height L1 of the blunt edge to be 16-24mm. The base material gap is adjusted to 1-3mm using a base material gap fine-tuning mechanism. Beveling is performed on both the front and back sides, with the beveling angle θ1 on the front side and θ2 on the back side both set to 75±3°, allowing welding operations to proceed. The blunt edge angle θ can directly utilize the 1° to 5° natural angle generated during material cutting, requiring no additional processing. The preferred natural angle is 3°, with a natural angle error ≤ ±0.5°.

[0022] In the above-mentioned embodiments of the submerged arc welding device for medium and thick steel plates of this utility model, the front side needs to be welded first, and then the reverse side is welded after being flipped over by a crane.

Claims

1. A submerged arc welding device for medium-thick steel plates, characterized in that: The system includes a base material splicing mechanism, a base material gap fine-tuning mechanism, a welding trolley (1), and a trolley track (2). The base material splicing mechanism includes a steel plate moving track (5), a left support block (6), and a right support block (7). The steel plate moving track (5) is mounted on a support base frame. The left support block (6) and the right support block (7) are movably mounted on the steel plate moving track (5). The left support block (6) supports base material two (4), and the right support block (7) supports base material one (3). At the weld, base material one (3) and... The second base material (4) is provided with a blunt edge (12). The blunt edge (12) is inclined and is a sloping blunt edge. The blunt edge (12) has a blunt edge vertical height (L1). There is a base material gap (L) between the two base materials and a blunt edge included angle (θ) between the two blunt edges. The base material gap fine adjustment mechanism is set on the steel plate moving track (5). The first base material (3) is dragged to move left and right. The trolley track (2) is placed on the first base material (3) or the second base material (4). The welding trolley (1) moves along the trolley track (2) to perform welding operations.

2. The submerged arc welding apparatus for medium-thick steel plates according to claim 1, characterized in that: The base material gap fine adjustment mechanism includes a fine adjustment screw (8), a screw support (9), a handwheel (10), and a support block support (11). The screw support (9) is movably mounted on the steel plate moving track (5). The fine adjustment screw (8) is mounted on the screw support (9). The support block support (11) is fixed together with the left support block (6) and the right support block (7). The end of the fine adjustment screw (8) is fixed to the support block support (11), and the other end is provided with a handwheel (10).

3. The submerged arc welding apparatus for medium-thick steel plates according to claim 2, characterized in that: The left support block (6), right support block (7), and support block bracket (11) can all be locked and positioned between pins and the steel plate moving track (5).

4. The submerged arc welding apparatus for medium-thick steel plates according to claim 1, characterized in that: The vertical height (L1) of the blunt edge is 16-24mm, the gap (L) between the base materials is 1-3mm, and the included angle (θ) of the blunt edge is 2-10°.

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