An S-shaped welding groove of an ultra-thick steel plate and a processing method thereof

Abstract

The invention discloses an S-shaped welding groove of an ultra-thick steel plate and a processing method. The S-shaped groove is a combination of a V-shaped groove and a U-shaped groove. Flame linear cutting is first used to process the V-shaped groove, and then a carbon arc air planer is used to plan the root of the V-shaped groove surface to form a small U-shaped groove surface. Finally, an angle grinder is used to clean the surface. The invention has the advantages of saving welding auxiliary materials, reducing labor intensity, and improving efficiency. In actual processing, the operation is convenient, the site is not restricted, the adopted machine tools are simple, and the processing cycle is short. The S-shaped groove can play a good role in improving work efficiency and reducing costs in the welding processing of thick steel plates for processing and welding steel structure bridges, steel structure high-rise buildings and other projects, solves the contradiction between reducing welding deformation, stabilizing the geometric size of rods and the amount of welding auxiliary materials used and the size of the groove, and can be used in the main joint forms of thick plate welding, can save more than 30% of welding materials, and improve work efficiency by more than 40%.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure processing, and in particular relates to an S-shaped welding groove of an ultra-thick steel plate and a processing method thereof. Background Art

[0002] With the development of metal material science in my country, steel metallurgy technology has promoted the development of engineering technologies such as railways and high-rise steel structures. The designs are novel and the shapes are unique. In particular, large-span bridges and high-rise steel structures have sprung up like mushrooms after rain. In particular, the variety of materials used in engineering is increasing, and the thickness of steel is getting thicker and thicker. Although welding technology has also been greatly improved, the traditional processing methods are still maintained in the processing and manufacturing of steel structure engineering. Among them, there is no major breakthrough in welding groove processing. Reducing welding materials, reducing welding deformation and internal stress requires machining, which increases costs and affects work efficiency; flame cutting improves work efficiency and reduces costs, but the welding materials used increase, welding deformation increases, and internal stress increases. Many types of grooves and processing are optimized in terms of engineering cost, structure type, plate thickness, etc., and processing and manufacturing processes are selected. At present, groove processing is directly processed by planing, milling, flame cutting, etc., and perfect optimization cannot be achieved. Summary of the invention

[0003] The present invention aims at the deficiencies of the prior art and provides an S-shaped welding groove and processing method for an ultra-thick steel plate. The S-shaped groove and processing method are simple and efficient to process, reduce welding materials, reduce welding labor intensity, improve work efficiency as a whole, and more importantly, can reduce welding deformation and welding stress, which can truly reduce labor, energy, efficiency, and cost in the actual processing and manufacturing process.

[0004] The specific technical solutions of the present invention are as follows:

[0005] An S-shaped welding groove for an ultra-thick steel plate comprises a steel plate body, one side of the steel plate body is provided with an S-shaped groove so that a planing area and a welding material saving area are formed on one side of the steel plate, and the angle of the S-shaped groove is 25° to 40°.

[0006] As a preferred technical solution, the angle of the S-shaped groove is 30°.

[0007] As a preferred technical solution, a circular arc is drawn downward from the point where the welding gun sheath diameter contacts the groove surface to a position 2 to 5 mm above the bottom edge of the groove to form the planing area.

[0008] As a preferred technical solution, the 45° groove line on one side of the steel plate body and the area formed by the 45° groove line and the optimized S-shaped groove edge are used as the welding material saving area.

[0009] A method for processing an S-shaped welding groove of an ultra-thick steel plate as described above is characterized in that it comprises the following steps:

[0010] Step 1: S-shaped groove design:

[0011] Optimize the groove of conventional joints to be welded:

[0012] 1) First determine the original V-shaped groove angle, and the welding gun nozzle should be less than 20mm from the bottom edge of the groove;

[0013] 2) Taking the contact point between the welding gun sheath diameter and the groove surface as the base point, the minimum groove angle is optimized based on the principle that the welding gun can move freely, reduce the amount of welding wire integrated, and reduce the welding time;

[0014] 3) Using the point where the welding gun sheath diameter contacts the groove surface as the base point, draw an arc downward to a position 2mm above the bottom edge of the groove as the planing range;

[0015] Step 2: Single-sided V-shaped groove processing:

[0016] After the processing groove angle is determined, a linear flame cutting machine is used to cut according to the groove angle designed by the process. The cutting process parameters are modulated according to the conventional cutting process parameters and operation steps to complete the flame cutting groove and form the upper half of the S-shaped groove.

[0017] Step 3: Carbon Arc Gouging:

[0018] After the flame cutting groove is completed, according to the thickness of the steel plate and the process design requirements, the edge line of the carbon arc gouging range is drawn with a stone pencil on the lower half of the groove surface; when gouging, gouge from top to bottom, layer by layer, and the thickness of each layer does not exceed 3mm. The shape of the single-sided groove after planing is like half a water drop, the overall width of the planing is consistent, and the relative height difference of the planing surface does not exceed 0.5mm, completing the lower half of the S-shaped groove;

[0019] Step 4: S-shaped groove trimming:

[0020] After the carbon arc gouging process is completed, the planed surface is polished and the polished planed surface shows metallic luster. The thickness of the removed layer is not less than 0.5mm. There are no defects on the surface after grinding, the width is consistent, and the planed surface and the flame cut surface have a smooth transition at the corners.

[0021] Step 5: After the overall process is completed, the geometric dimensions and appearance of the groove and groove surface are inspected for quality.

[0022] As a preferred technical solution, the original V-shaped groove includes butt joint, T-joint double V-shaped and single-sided V-shaped.

[0023] As a preferred technical solution, the diameter of the welding gun sheath is 22 mm.

[0024] As a preferred technical solution, in step 3, a stone pencil is used to mark the edge of the carbon arc gouging range on the lower half of the groove surface.

[0025] As a preferred technical solution, in step 4, the planed surface is grinded with an angle grinder.

[0026] The beneficial effects are:

[0027] The present invention is applied to the manufacturing and processing industries of steel structure bridges and other steel structures using thick steel plates. Both single and double sides can be processed, thereby reducing the consumption of welding auxiliary materials and reducing welding deformation, saving raw materials, improving work efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 This is a schematic diagram of a conventional welding groove.

[0030] Figure 2 It is a structural schematic diagram of the S-shaped welding groove of ultra-thick steel plates.

[0031] In the figure, the reference numerals are as follows:

[0032] 1 is the steel plate body, 2 is the S-shaped groove, 3 is the planing area, and 4 is the welding material saving area. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0037] The present invention will now be further described with reference to the accompanying drawings.

[0038] like Figure 1 As shown, it is a conventional welding groove in the prior art, which is a V-shaped groove. Usually, the angle of this V-shaped groove is 45°. Figure 2 It is a schematic diagram of the S-shaped groove of the present invention, an S-shaped welding groove of an ultra-thick steel plate, comprising a steel plate body 1, an S-shaped groove 2 is arranged on one side of the steel plate body 1, so that a planing area 3 and a welding material saving area 4 are formed on one side of the steel plate, and the angle of the S-shaped groove is 30°.

[0039] Thick plate S-shaped groove and processing method:

[0040] The first step is S-shaped groove design:

[0041] Before S-shaped groove processing, the groove of the conventional joint to be welded needs to be optimized:

[0042] 1) First determine the original V-shaped groove angle (including butt double V-shaped and single-sided V-shaped), and the welding gun nozzle should be less than 20mm from the bottom edge of the groove to ensure the welding process requirements;

[0043] 2) Taking the contact point between the welding gun sheath diameter (usually 22mm) and the groove surface as the base point, optimize the minimum groove angle, with the principle that the welding gun can move freely, reduce the amount of welding wire integrated, and shorten the welding time;

[0044] 3) Take the contact point between the welding gun sheath diameter and the groove surface as the base point and draw an arc downward to the position 2mm above the bottom edge of the groove as the planing range (the part to be planed). The actual range after planing should exceed the range line by 2-3mm.

[0045] The second step is single-sided V-shaped groove processing:

[0046] After the processing groove angle is determined, the linear flame cutting machine can be directly used to cut according to the groove angle designed by the process. The cutting process parameters are modulated and cut according to the conventional cutting process parameters and operating steps to complete the flame cutting groove and form the upper half of the S-shaped groove.

[0047] The third step is carbon arc gouging:

[0048] After the flame cutting groove is completed, according to the thickness of the steel plate and the process design requirements, the edge of the carbon arc gouging range is marked with a stone pencil on the lower half of the groove surface; when gouging, gouge from top to bottom, layer by layer, and the thickness of each layer should not exceed 3mm. After gouging, the shape is like half a water drop (single-sided groove shape). The overall width of the planing is consistent, and the relative height difference of the planed surface should not exceed 0.5mm, completing the lower half of the S-shaped groove.

[0049] Step 4: S-shaped groove trimming:

[0050] After the carbon arc gouging process is completed, the planed surface needs to be polished with an angle grinder. The planed surface should show metallic luster after grinding, and the thickness of the removed layer (depending on the planing flatness) should not be less than 0.5mm. After grinding, the surface should be free of defects, the width should be consistent, and the planed surface and the flame cut surface should have a smooth transition at the corners.

[0051] After the overall processing is completed, the geometric dimensions and appearance of the groove and groove surface need to be inspected for quality.

[0052] Therefore, the present invention is a combination of a V-shaped groove and a U-shaped groove. The V-shaped groove is first processed by flame linear cutting, and then a carbon arc gouging is used to gouge the root of the V-shaped groove surface to form a small U-shaped groove surface. Finally, an angle grinder is used to clean the surface. The present invention has the advantages of saving welding auxiliary materials, reducing labor intensity, and improving efficiency. In actual processing, the operation is convenient, it is not restricted by the site, the machines used are simple (common tools: linear flame cutting machine, carbon arc gouging machine, angle grinder), and the processing cycle is short. The S-shaped groove is used to improve the work efficiency and reduce the cost of welding thick steel plates for processing and welding steel structure bridges, steel structure high-rise buildings and other projects. It solves the contradiction between reducing welding deformation, stabilizing the geometric size of the rod and the amount of welding auxiliary materials used and the size of the groove. It can be used in the main joint forms of thick plate welding, can save more than 30% of welding materials, and improve the work efficiency by more than 40%. It can provide a reference basis for similar steel structure welding processing.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A groove processing method for an S-shaped welding groove of an ultra-thick steel plate, wherein the S-shaped welding groove of the ultra-thick steel plate comprises a steel plate body, and an S-shaped groove is arranged on one side of the steel plate body, so that a planing area and a welding material saving area are formed on one side of the steel plate, and the angle of the S-shaped groove is 25° to 40°, characterized in that: The following steps are involved: Step 1: S-shaped groove design: Optimize the groove of conventional joints to be welded: 1) First determine the original V-shaped groove angle, and the welding gun nozzle should be less than 20mm from the bottom edge of the groove; 2) Taking the contact point between the welding gun sheath diameter and the groove surface as the base point, the minimum groove angle is optimized based on the principle that the welding gun can move freely, reduce the amount of welding wire integrated, and reduce the welding time; 3) Take the point where the welding gun sheath diameter contacts the groove surface as the base point and draw an arc downward to the position 2mm above the bottom edge of the groove as the planing range; Step 2: Single-sided V-shaped groove processing: After the processing groove angle is determined, a linear flame cutting machine is used to cut according to the groove angle designed by the process. The cutting process parameters are modulated according to the conventional cutting process parameters and operation steps to complete the flame cutting groove and form the upper half of the S-shaped groove. Step 3: Carbon Arc Gouging: After the flame cutting groove is completed, according to the thickness of the steel plate and the process design requirements, the edge line of the carbon arc gouging range is drawn with a stone pencil on the lower half of the groove surface; when gouging, gouging is carried out from top to bottom, layer by layer, and the thickness of each layer does not exceed 3mm. The shape of the single-sided groove after planing is half a water drop, the overall width of the planing is consistent, and the relative height difference of the planed surface does not exceed 0.5mm, completing the lower half of the S-shaped groove; Step 4: S-shaped groove trimming: After the carbon arc gouging process is completed, the planed surface is polished and the polished planed surface shows metallic luster. The thickness of the removed layer is not less than 0.5mm. There are no defects on the surface after grinding, the width is consistent, and the planed surface and the flame cut surface have a smooth transition at the corners. Step 5: After the overall process is completed, the geometric dimensions and appearance of the groove and groove surface are inspected for quality; Taking the contact point between the welding gun sheath diameter and the groove surface as the base point, draw an arc downward to a position 2 to 5 mm above the groove to form the planing area; The 45° groove line on one side of the steel plate body and the area formed by the 45° groove line and the optimized S-shaped groove edge are the welding material saving area.

2. The groove processing method according to claim 1, characterized in that: The original V-shaped grooves include butt joint, T-joint double V-shaped and single-sided V-shaped.

3. The groove processing method according to claim 1, characterized in that: The welding gun sheath has a diameter of 22 mm.

4. The groove processing method according to claim 1, characterized in that: In the step 4, the planed surface is polished with an angle grinder.

5. The groove processing method according to claim 1, characterized in that: The angle of the S-shaped groove is 30°.

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