Large-format ultra-thin double-layer hollow steel plate sign welding process

Abstract

The present application relates to a kind of large-format ultra-thin double-layer hollow steel plate sign welding process, including including surface treatment, windowing, stiffened rib plate prewelding, superposition positioning, window first pass welding, window secondary welding and periphery closure and the like steps, especially in the welding window of double-layer steel plate respectively welds the two sides of stiffened rib plate, under the premise that the single-sided steel plate is extremely little subtractive amount, realize double-sided welding to offset the local strength loss caused by windowing, so that sign overall rigidity is higher;Stiffened rib plate realizes the effective connection and strengthening between two layers of steel plate, solves the problem of insufficient structural strength of large-format ultra-thin double-layer hollow steel plate sign, has the advantages of improving structural strength, preventing middle part from sagging, realizing large-area sign production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate welding, in particular to a large-panel ultra-thin double-layer hollow steel plate sign welding process. BACKGROUND

[0002] The ultra-thin double-layer steel plate in sign making, which is combined by two extremely thin steel plates through bonding or compounding process, is particularly suitable for hanging, pasting or fixing in areas with limited bearing capacity (such as glass curtain walls, indoor walls, etc.) due to its lightweight design, and the double-layer design can effectively solve the problem of easy deformation and concave of single-layer thin plate. However, the existing manufacturing process is difficult to manufacture large-panel ultra-thin double-layer hollow steel plate signs, because the large size and limited thickness of the steel plate surface makes it difficult to insert the welding gun into the welding connection structure (usually a rib plate or a column) between the double-layer steel plates to strengthen the stability between the double-layer steel plates. After the size is too large, the sign is easy to deform and concave due to wind pressure, self-weight and other factors. SUMMARY

[0003] I. Technical problems to be solved

[0004] The purpose of the present application is to provide a large-panel ultra-thin double-layer hollow steel plate sign welding process, which has the advantages of improving structural strength, preventing the middle part from being concave, and realizing large-area sign making.

[0005] II. Technical solutions

[0006] The present application is realized by the following technical solutions:

[0007] According to a first aspect of the present application, a large-panel ultra-thin double-layer hollow steel plate sign welding process is provided, comprising the following steps:

[0008] S1 surface treatment: sandblasting pretreatment of the outer surface of the steel plate;

[0009] S2 windowing: a plurality of welding windows for the head of the welding gun to pass through are opened at a plurality of preset positions on the inner surface of the steel plate, and the welding windows are opened at a preset inner inclination angle θ;

[0010] S3 reinforced rib plate pre-welding: reinforced rib plates are welded in parallel on one side close to the welding windows, and welding grooves are reserved on both sides of the top of the reinforced rib plates, and a rib-window spacing d is controlled between the welding windows and the reinforced rib plates, and the rib-window spacing d and the inner inclination angle θ control the welding gun head to be directed to the welding groove after the welding gun passes through the welding window;

[0011] S4 superposition positioning: the two steel plates are superposed and positioned using a magnetic clamp, so that the end faces of the reinforced rib plates of the two steel plates are in contact;

[0012] S5 window first pass welding: the welding torch head is inserted into the space between the two steel plates through the welding window of the upper steel plate, and the welding torch is moved along the welding window to perform first pass welding on one side edge of the contact strengthening rib plate;

[0013] S6 window second pass welding: the workpiece is flipped over, the welding torch head is inserted into the space between the two steel plates through the welding window of the lower steel plate, and the welding torch is moved along the welding window to perform welding on the other side edge of the contact strengthening rib plate;

[0014] S7 peripheral sealing: a continuous fillet weld is used to weld the four peripheral strips between the edges of the two steel plates.

[0015] According to the embodiment of the present application, the rib window spacing d = H * tanθ + δ, wherein H is the height of the strengthening rib plate, θ is the inner inclination angle, and is 30°-45°, and δ is the safety allowance, and is 3-5 mm.

[0016] According to the embodiment of the present application, the strengthening rib plate parameters satisfy: the rib plate height H is 1.2-4 times the thickness t of the steel plate, the rib plate spacing L≤(2Et)^ (1 / 2); the bevel angle α is 45°±5°, wherein t is the thickness of the steel plate, and E is the elastic modulus.

[0017] According to the embodiment of the present application, in step S3, the strengthening rib plate is welded by adopting CO2 gas shielded welding, and the welding sequence is skip welding from the center to the edge with an interval distance≥300 mm.

[0018] According to the embodiment of the present application, in step S4, the bevel alignment deviation of the strengthening rib plate is controlled to be≤0.5 mm; after the two steel plates are positioned, the four peripheral strips are welded between the edges of the two steel plates through temporary welding points, and the interval distance of the temporary positioning welding points is≤1000 mm.

[0019] According to the embodiment of the present application, in steps S5 and S6, the welding current is controlled to be 150A-180A, and the welding speed is controlled to be 8-12 cm / min; at the same time, the interlayer temperature of the two steel plates is monitored by a short-wave infrared thermal imager at a sampling frequency of 50 Hz, when the interlayer temperature is detected to be >140℃, the welding current is automatically reduced by 5%-8%, and compressed air is obliquely blown for auxiliary cooling at a distance of 30 cm from the weld.

[0020] According to the embodiment of the present application, in step S7, the welding leg height K = 0.7t and K≥4 mm, the welding speed is controlled to be 25-35 cm / min, and t is the thickness of the steel plate.

[0021] According to the embodiment of the present application, in step S2, the welding window is opened in the width direction of the steel plate with an interval; in step S3, the strengthening rib plate has a thick plate segment and a thin plate segment arranged at intervals, and the side edges of the thick plate segment and the thin plate segment each correspond to a parallel welding window, and the rib window spacing d of the thick plate segment, the thin plate segment and the welding window is controlled to be equal.

[0022] According to the embodiment of the present application, in step S4, before the two steel plates are positioned in superposition, sleeves and auxiliary positioning rods are respectively welded at several predetermined points of the two steel plates, and when the two steel plates are positioned in superposition, the auxiliary positioning rods are inserted into the sleeves to ensure accurate alignment of the end faces of the reinforcing rib plates of the two steel plates.

[0023] III. Advantages

[0024] The one or more embodiments described above have the following advantages or benefits:

[0025] The large-format ultra-thin double-layer hollow steel plate sign welding process of the embodiment of the present application includes the following steps: surface treatment, windowing, reinforcing rib plate pre-welding, positioning in superposition, first welding of the window, secondary welding of the window, and peripheral closure. In particular, reinforcing rib plates are respectively welded on both sides of the welding window of the double-layer steel plate, which realizes double-sided welding under the premise of extremely small material removal of the single-sided steel plate, offsets the local strength loss caused by windowing, and makes the overall rigidity of the sign higher. The reinforcing rib plates achieve effective connection and reinforcement between the two layers of steel plates, solve the problem of insufficient structural strength of the large-format ultra-thin double-layer hollow steel plate sign, and have the advantages of improving structural strength, preventing the middle part from being concave, and realizing the production of large-area signs. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above content and other purposes, features, and advantages of the present application will be more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0027] Figure 1 is a flow structure diagram of the process of the present application

[0028] Figure 2 is an exploded view of an ultra-thin double-layer hollow steel plate sign;

[0029] Figure 3 is a side perspective view of positioning in superposition of the double-layer steel plate;

[0030] Figure 4 is a structural schematic diagram of an embodiment of the reinforcing rib plate pre-welding window layout;

[0031] 1, steel plate; 2, edge strip; 3, reinforcing rib plate; 3a, thin plate section; 3b, thick plate section; 4, welding window; 5, sleeve; 6, auxiliary positioning rod. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the protection scope of the present application.

[0033] The embodiment of the present application provides a large-format ultra-thin double-layer hollow steel plate sign welding process, which comprises the following steps:

[0034] S1 surface treatment: the outer surface of the steel plate 1 is sandblasted for pretreatment to a cleanliness of Sa2.5 level, and the surface flatness tolerance of the steel plate 1 is ≤1.5 mm / m²; wherein the sandblasting treatment ensures that the removal rate of the oxidation layer on the welding surface is more than 98%, and the flatness tolerance, the welding deformation pre-compensation amount are controlled to ensure the quality of subsequent welding.

[0035] S2 windowing: welding windows 4 for the head of a welding gun to pass through are formed at a plurality of preset positions on the inner surface of the steel plate 1, and the welding windows 4 are formed at a preset inner inclination angle θ; the preset positions are distributed in a staggered manner on the surface of the steel plate 1 to form non-continuous stress concentration points; the width of the welding window 4 is not higher than 5 mm, and a plurality of steel plates 1 are formed with welding windows 4 in a pipeline manner in the same way to improve production efficiency;

[0036] S3 pre-welding of reinforcing rib plate: reinforcing rib plates 3 are welded in parallel at one side close to the welding windows 4 to realize local stiffness improvement; wherein the top of the reinforcing rib plate 3 is provided with a welding groove reserved on both sides of the edge, a rib-window spacing d is controlled between the welding window 4 and the reinforcing rib plate 3 to ensure the stability of the wire extension length, and the rib-window spacing d and the inner inclination angle θ are controlled to enable the head of the welding gun to be just directed to the welding groove after the welding gun passes through the welding window 4; wherein the rib-window spacing is the distance between the center of the welding window 4 and the edge of the reinforcing rib plate 3, the length of the welding window 4 is not less than that of the reinforcing rib plate 3, and the normal angle between the welding gun axis and the welding groove is ≤15°.

[0037] S4 superposition positioning: two steel plates 1 are positioned by using a magnetic clamp to reduce the misalignment amount, so that the end faces of the reinforcing rib plates 3 of the two steel plates 1 are in contact, and a three-dimensional grid support structure is formed; the welding windows 4 of the two steel plates 1 after relative superposition are just located on both sides of the reinforcing rib plate 3, which facilitates welding of the joints between the reinforcing rib plates 3 from both sides in sequence;

[0038] S5 window first pass welding: the welding torch head is inserted between the two steel plates 1 through the upper steel plate 1 welding window 4, the welding torch is moved along the welding window 4, and the first pass welding is performed on the side edge of the aligned contact rib plate 3; the difficult-to-reach parts of the two steel plates 1 can be connected by welding through the rib plate 3, and the existence of the inward inclination angle θ facilitates the control of the welding torch direction, improves the welding accuracy and speed;

[0039] S6 window second pass welding: the workpiece is hoisted and turned over, the welding torch head is inserted between the two steel plates 1 from the welding window 4 of the lower steel plate 1, the welding torch is moved along the welding window 4, and the other side edge of the aligned contact rib plate 3 is welded, and the two side edges of the rib plate 3 are welded at the welding window 4 of the double-layer steel plate, realizing double-sided welding on the premise that the single-sided steel plate has little material removal, offsetting the local strength loss caused by windowing, and making the sign overall rigidity higher;

[0040] S7 peripheral sealing: a continuous fillet weld is used to weld the four peripheral strips 2 between the edges of the two steel plates 1 to establish a complete sealed cavity and ensure the sealing and strength of the overall structure.

[0041] Specifically, the rib window spacing d = H*tanθ + δ, wherein H is the height of the rib plate 3; θ is the inward inclination angle, which is 30°-45°; δ is the safety allowance, which is 3-5 mm to compensate for the tooling tolerance.

[0042] Wherein, the rib plate 3 parameters meet: the rib plate height H is 1.2-4 times the thickness t of the steel plate 1, the rib plate spacing L≤(2Et)^ (1 / 2) to control the local buckling critical load; the bevel angle α is 45°±5°, wherein t is the thickness of the steel plate 1; E is the elastic modulus.

[0043] In step S3, the rib plate 3 is welded by CO2 gas shielded welding, the welding sequence is skip welding from the center to the edge, and the interval distance is ≥300mm to reduce the amount of thermal deformation and prevent the overlap of the heat affected zone.

[0044] Preferably, in step S4, the bevel alignment deviation of the rib plate 3 is controlled to be ≤0.5mm to realize precise welding; after the two steel plates 1 are positioned, the four peripheral strips 2 are temporarily welded between the edges of the two steel plates 1, and the temporary positioning weld point spacing is ≤1000mm to ensure the positioning accuracy of the overall structure of the sign.

[0045] Further, in steps S5 and S6, the welding current is controlled to be 150A-180A, and the welding speed is controlled to be 8-12cm / min; at the same time, the interlayer temperature of the two steel plates 1 is monitored by a short-wave infrared thermal imager at a sampling frequency of 50Hz to realize intelligent heat management, when the interlayer temperature is detected to be >140℃, the welding current is automatically reduced by 5%-8%, and compressed air is blown obliquely 30cm away from the weld to assist cooling, ensuring the welding quality.

[0046] In step S7, the fillet height K=0.7t and K≥4mm, the welding speed is controlled at 25-35cm / min, and t is the thickness of the steel plate.

[0047] According to the embodiment of the present application, in step S2, the welding windows 4 are opened in the width direction of the steel plate 1 at intervals, so as to reduce the stress concentration of the opening and facilitate the overall deformation of the steel plate 1; in step S3, the reinforcing rib plate 3 has the thick plate segments 3b and the thin plate segments 3a arranged at intervals, the thick plate segments 3b and the thin plate segments 3a correspond to the parallel welding windows 4 on the side edges, the rib window spacing d of the thick plate segments 3b, the thin plate segments 3a and the welding windows 4 is controlled to be equal, so as to facilitate the welding by the welding robot at the same welding angle.

[0048] According to the embodiment of the present application, in step S4, before the two steel plates 1 are overlapped and positioned, the sleeve 5 and the auxiliary positioning rod 6 are respectively welded at a plurality of predetermined points of the two steel plates 1, and when the two steel plates 1 are overlapped, the auxiliary positioning rod 6 is inserted into the sleeve 5 to ensure the accurate positioning of the end faces of the reinforcing rib plate 3 of the two steel plates 1.

[0049] The process provided by the present application can quickly and batch produce large-format ultra-thin and high-structural-strength and less-deformable ultra-thin double-layer hollow steel plate signs. In the process, a grid reinforcing rib plate 3 is pre-set inside the double-layer steel plate, the mechanical weak points of the sign area and shape are matched through mathematical modeling, and directional reinforcement is realized as needed; through the staggered distribution of the micro welding windows 4 and the inclined windowing process, only a small mark is left on the surface of the sign after welding, and a visual mark-free effect is realized after spraying; the welding windows 4 reserved on the surface form a honeycomb-shaped ventilation channel between the double-layer structures, which can reduce the wind pressure load on the windward surface. In high-temperature weather, the welding windows 4 cause the air inside and outside the sign to flow, reduce the surface temperature rise, and avoid the peeling of the coating caused by high temperature.

[0050] It should be understood that the cutting device according to the embodiment of the present application has all the features and advantages of the above-mentioned positioning mechanism, and specific reference can be made to the description above, which will not be repeated here.

[0051] It should be understood by those skilled in the art that the features described in various embodiments of the present application can be combined or / and combined, even if such combination or combination is not explicitly described in the present application. In particular, the features described in various embodiments of the present application can be combined and / or combined in various combinations without departing from the spirit and teachings of the present application. All these combinations and / or combinations fall within the scope of the present application.

Claims

1. A large-format ultra-thin double-layer hollow steel plate sign welding process, characterized in that, The method comprises the following steps: S1 surface treatment: sand blasting pretreatment on the outer surface of the steel plate; S2 windowing: multiple welding windows for the welding torch head to pass through are opened at multiple preset positions on the inner surface of the steel plate, and the welding windows are opened with a preset inner inclination angle θ; S3 reinforced rib plate pre-welding: reinforced rib plates are welded in parallel on one side close to the welding windows, the top of the reinforced rib plates is reserved with a welding groove on both sides, a rib-window spacing d is controlled between the welding windows and the reinforced rib plates, and the rib-window spacing d and the inner inclination angle θ control the welding torch head to be just directed to the welding groove after the welding torch passes through the welding window; S4 superposition positioning: two steel plates are positioned and superposed by using a magnetic clamp, so that the end faces of the reinforced rib plates of the two steel plates are in abutting contact; S5 window first welding: the welding torch head is inserted between the two steel plates through the welding window of the upper steel plate, the welding torch is moved along the welding window, and the first welding is performed on one side edge of the abutting contact reinforced rib plate; S6 window secondary welding: the workpiece is flipped, the welding torch head is inserted between the two steel plates through the welding window of the lower steel plate, the welding torch is moved along the welding window, and the welding is performed on the other side edge of the abutting contact reinforced rib plate; S7 peripheral sealing: four peripheral strips between the edges of the two steel plates are welded by using continuous fillet welding.

2. The welding process of a large-format ultra-thin double-layer hollow steel plate sign according to claim 1, characterized in that, The rib-window spacing d = H*tanθ+δ, wherein, H is the height of the reinforced rib plate; θ is the inner inclination angle, and is 30°-45°; and δ is a safety allowance, and is 3-5 mm.

3. The process for welding large-format, ultra-thin, double-layer, hollow steel plate signs according to claim 1, characterized in that, The reinforced rib plate parameters satisfy: the rib plate height H is 1.2-4 times the thickness t of the steel plate, the rib plate spacing L≤(2Et)^(1 / 2); the groove angle α is 45°±5°, wherein, t is the thickness of the steel plate; and E is the elastic modulus.

4. The welding process of a large-format ultra-thin double-layer hollow steel plate sign according to claim 1, characterized in that, In step S3, the reinforced rib plates are welded by using CO2 gas shielded welding, and the welding sequence is skip welding from the center to the edge with an interval distance≥300 mm.

5. The process as claimed in claim 1, wherein, In step S4, the abutting deviation of the groove of the reinforced rib plate is controlled to be≤0.5 mm; after the two steel plates are positioned and superposed, the four peripheral strips between the edges of the two steel plates are welded by temporary welding points, and the interval distance of the temporary positioning welding points is≤1000 mm.

6. The large-format, ultra-thin, double-layered, hollow steel plate sign welding process of claim 1, wherein, In steps S5 and S6, the welding current is controlled to be 150 A-180 A, and the welding speed is controlled to be 8-12 cm / min; meanwhile, the interlayer temperature of the two steel plates is monitored by a short-wave infrared thermal imager at a sampling frequency of 50 Hz, when the detected interlayer temperature is >140℃, the welding current is automatically reduced by 5%-8%, and compressed air is obliquely blown for auxiliary cooling at a distance of 30 cm from the weld.

7. The process as claimed in claim 1, wherein the process is characterized by, In step S7, the leg height K=0.7t and K≥4 mm, the welding speed is controlled to be 25-35 cm / min, and t is the thickness of the steel plate.

8. The process according to any one of claims 1-7, characterized in that, In step S2, the welding windows are opened in the width direction of the steel plate with an interval; in step S3, the reinforced rib plate has interval arranged thick plate segments and thin plate segments, the side edges of the thick plate segments and the thin plate segments correspond to parallel welding windows, and the rib-window spacing d of the thick plate segments, the thin plate segments and the welding windows is controlled to be equal.

9. The process for welding large-format, ultra-thin, double-layer, hollow steel panel signs according to claim 1, characterized in that, In step S4, before the two steel plates are positioned and superposed, sleeves and auxiliary positioning rods are welded at multiple predetermined positions of the two steel plates respectively, and when the two steel plates are superposed, the auxiliary positioning rods are inserted into the sleeves to ensure the abutting accuracy of the end faces of the reinforced rib plates of the two steel plates.

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