Processing method of high-low difference spherical flat steel transition welding

Abstract

This invention discloses a processing method for transition welding of bulb flat steel with height difference. The method specifically includes the following steps: S1, measuring the heights of the high-profile and low-profile bulb flat steels and calculating the height difference D; S2, calculating the transition section length L based on the height difference in S1, and marking a cutting area on the web end face of the high-profile bulb flat steel according to the height difference D and the transition section length L; S3, cutting the cutting area and performing transition processing on the cut area of ​​the high-profile bulb flat steel; S4, after the transition processing is completed, welding the high-profile bulb flat steel at the transition processing end to the side of the low-profile bulb flat steel to complete the butt welding of the high-profile and low-profile bulb flat steels. This invention achieves transition welding of bulb flat steels by cutting and processing the connecting side of the high-profile bulb flat steel, ensuring that the high-profile and low-profile bulb flat steels are connected at the same height and are connected in parallel, thus eliminating the need to process the low-profile bulb flat steel.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a processing method for transition welding of spherical flat steel with height difference. Background Technology

[0002] During the construction of ship sections, to ensure structural strength while saving steel and reducing ship weight, bulb flats of different heights are typically used in areas with different strength requirements. When butt-jointing bulb flats of different heights, direct welding is not possible due to the height difference; therefore, a transition section is needed to eliminate the height difference. Due to the unique characteristics of bulb flats, which have a bulbous end, the transition section method using sheet metal parts cannot be used.

[0003] Patent No. CN115041784B discloses a butt welding method for non-equal height spherical flat steel, including the following steps: S1: Determine the height difference between the first and second spherical flat steels, and select a transition area on the web of the first spherical flat steel according to the height difference; S2: Select a first distance and a second distance in the transition area, and open a first chamfer and a second chamfer connected to the first chamfer according to the first distance and the second distance, and open a crack-stopping hole in the first chamfer; S3: Press the ball head in the transition area towards the web and connect it with the second spherical flat steel; The first and second spherical flat steels are welded at an angle, and the first spherical flat steel destroys the integrity of the spherical flat steel, requiring re-welding, which reduces the strength of the spherical flat steel. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a processing method for transition welding of ball flat steel with high and low differences. By cutting and processing the connecting side of the high ball flat steel, the high ball flat steel and the low ball flat steel are connected at the same height and connected in parallel. The transition welding of ball flat steel can be achieved without processing the low ball flat steel.

[0005] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:

[0006] A processing method for transition welding of spherical flat steel with height difference, the method specifically includes the following steps:

[0007] S1, Measure the height of the high-spherical flat steel and the low-spherical flat steel, and calculate the height difference D between the high-spherical flat steel and the low-spherical flat steel;

[0008] S2, calculate the transition section length L based on the height difference between the high-spherical flat steel and the low-spherical flat steel in S1, and mark the cutting area on the web end face of the high-spherical flat steel according to the height difference D and the transition section length L.

[0009] S3, After the cutting area is marked out, the cutting area is cut, and the area of ​​the cut high-strength flat steel is processed.

[0010] S4. After the over-processing is completed, the high-ball flat steel at the over-processed end is welded to the side of the low-ball flat steel to complete the butt welding of the high-ball flat steel and the low-ball flat steel.

[0011] Furthermore, the heights of the high-strength and low-strength ball flat steels are the sum of the heights of the web and the ball head of the ball flat steel. The height of the high-strength ball flat steel is H1, the height of the low-strength ball flat steel is H2, and the height difference D between the high-strength and low-strength ball flat steels is D = H1 - H2.

[0012] Furthermore, the specific calculation formula for the transition section length L is: L = 10D.

[0013] Furthermore, the specific steps for defining the cutting area are as follows:

[0014] S21, place the high-ball flat steel with the ball head facing down, and measure the first connection point on the web end face of the high-ball flat steel connected to the low-ball flat steel.

[0015] S22, draw an arc with the first connection point as the center and a radius of L. The arc intersects the side of the web away from the ball head at the second connection point. Connect the first connection point and the second connection point. The line connecting the first connection point and the second connection point forms the first cutting area with the side of the web.

[0016] S23, with the first connection point as the foot of the perpendicular, draw a straight line perpendicular to the line connecting the first and second connection points. The straight line perpendicular to the line connecting the first and second connection points intersects the ball head of the high-strength flat steel at the third connection point. Connect the first connection point and the third connection point. The line connecting the first connection point and the third connection point forms the second cutting area with the side of the web.

[0017] Furthermore, the specific steps for cutting the cutting area in S3 are as follows: cut off the first and second cutting areas on the high-strength flat steel along the lines connecting the first and second connection points and the first and third connection points respectively, using a flame cutting torch, and the flatness of the cut surface is less than 1mm.

[0018] Furthermore, the specific steps for transition processing of the cut high-strength flat steel area in step S3 are as follows:

[0019] S31, place the high-strength flat steel on the fire-working platform with the ball head facing upwards; place the round steel column on one side of the ball head and the opposite side of the web of the high-strength flat steel to fix the high-strength flat steel.

[0020] S32, Determine the flame-baking area. The flame-baking area is on one side of the high-strength ball flat steel ball head. The distance between the center of the flame-baking area and the side of the high-strength ball flat steel connected to the low-strength ball flat steel is L. Bake the determined flame-baking area. Use a hammer to strike one side of the high-strength ball flat steel ball head so that the line connecting the first connection point and the second connection point is on the same straight line as the bottom edge of the web of the high-strength ball flat steel. The line connecting the first connection point and the third connection point is perpendicular to the bottom edge of the web of the high-strength ball flat steel.

[0021] Furthermore, the error in the line connecting the first connection point and the second connection point coinciding with the bottom edge of the web of the high-strength flat steel is less than 1 mm.

[0022] Furthermore, a round steel column is provided on one side of the ball head of the high-spherical flat steel, and two round steel columns are provided on one side of the web of the high-spherical flat steel; the pyrotechnic platform is a porous steel platform.

[0023] Furthermore, when the high-ball flat steel and the low-ball flat steel are joined, the side of the high-ball flat steel joined with the low-ball flat steel is perpendicular to the bottom edge of the web of the high-ball flat steel.

[0024] Based on the above technical solution, the processing method for transition welding of spherical flat steel with high and low differences, as disclosed in this invention patent, has achieved the following technical advantages through practical application:

[0025] 1. The present invention provides a processing method for transition welding of ball flat steel with high and low differences. By cutting and processing the connecting side of the high ball flat steel, the high ball flat steel and the low ball flat steel are connected at the same height and connected in parallel. The ball flat steel can be transition welded without processing the low ball flat steel.

[0026] 2. The present invention provides a processing method for transition welding of spherical flat steel with high and low differences. By treating the connection side of the high spherical flat steel, parallel butt welding of the high and low spherical flat steel is achieved, reducing post-weld stress and improving the connection quality after welding.

[0027] 3. The present invention provides a processing method for transition welding of high and low spherical flat steel. By cutting off one side of the high spherical flat steel, the overall strength of the high spherical flat steel is not damaged, which improves the strength of the butt welding between the high and low spherical flat steel. This method reduces the amount of welding work, reduces the strength loss of the spherical flat steel, and improves work efficiency. Attached Figure Description

[0028] Figure 1 This is a diagram showing the connection structure between the high-spherical flat steel and the low-spherical flat steel in a processing method for transition welding of high and low-spherical flat steel according to the present invention.

[0029] Figure 2 This is a structural diagram of the high-spherical flat steel cutting area in a processing method for transition welding of high and low spherical flat steel according to the present invention.

[0030] Figure 3 This is a flowchart of the transition process in a method for transition welding of flat spherical steel with high and low differences according to the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0032] like Figure 1-3 The present invention pertains to a processing method for transition welding of spherical flat steel with height difference, and the method specifically includes the following steps:

[0033] S1, Measure the height of high-ball flat steel 1 and low-ball flat steel 2, and calculate the height difference D between high-ball flat steel 1 and low-ball flat steel 2;

[0034] S2, calculate the transition section length L based on the height difference between the high-spherical flat steel 1 and the low-spherical flat steel 2 in S1, and mark the cutting area on the web end face of the high-spherical flat steel 1 based on the height difference D and the transition section length L.

[0035] S3, After the cutting area is marked out, the cutting area is cut, and the area of ​​the cut high-spherical flat steel 1 is subjected to transition processing;

[0036] S4. After the over-processing is completed, the high-spherical flat steel 1 and the low-spherical flat steel 2 at the over-processed end are welded together to complete the butt welding of the high-spherical flat steel 1 and the low-spherical flat steel 2.

[0037] The height of high-spherical flat steel 1 is less than or equal to 140mm, and the height difference D between high-spherical flat steel 1 and low-spherical flat steel 2 is less than or equal to 40mm.

[0038] The heights of the high-strength ball flat steel 1 and the low-strength ball flat steel 2 are the sum of the heights of the web and the ball head of the ball flat steel. The height of the high-strength ball flat steel 1 is H1, the height of the low-strength ball flat steel 2 is H2, and the height difference D between the high-strength ball flat steel 1 and the low-strength ball flat steel 2 is D = H1 - H2.

[0039] The specific formula for calculating the length L of the transition section is: L = 10D.

[0040] The specific steps for defining the cutting area are as follows:

[0041] S21, place the high-ball flat steel 1 with the ball head facing down, and measure the first connection point 41 on the web end face of the high-ball flat steel 1 connected to the low-ball flat steel 2.

[0042] S22, draw an arc with the first connection point 41 as the center and a radius of L. The arc intersects the side of the web away from the ball head at the second connection point 42. Connect the first connection point 41 and the second connection point 42. The line connecting the first connection point 41 and the second connection point 42 forms the first cutting area 11 with the side of the web.

[0043] S23, with the first connection point 41 as the foot of the perpendicular, draw a straight line perpendicular to the line connecting the first connection point 41 and the second connection point 42. This straight line perpendicular to the line connecting the first connection point 41 and the second connection point 42 intersects the ball head of the high-strength ball flat steel 1 at the third connection point 43. Connect the first connection point 41 and the third connection point 43. The line connecting the first connection point 41 and the third connection point 43 forms the second cutting area 12 with the side of the web. By cutting and processing the connecting side of the high-strength ball flat steel 1, the high-strength ball flat steel 1 and the low-strength ball flat steel 2 are connected at the same height. At the same time, the high-strength ball flat steel 1 and the low-strength ball flat steel 2 are connected in parallel. The ball flat steel transition welding can be achieved without processing the low-strength ball flat steel 2.

[0044] The specific steps for cutting the cutting area in S3 are as follows: cut off the first cutting area 11 and the second cutting area 12 on the high-strength flat steel 1 along the lines connecting the first connection point 41 and the second connection point 42 and the first connection point 41 and the third connection point 43 respectively, using a flame cutting torch, and the flatness of the cut surface is less than 1mm.

[0045] The specific steps for transition processing of the area of ​​the cut high-strength flat steel 1 in S3 are as follows:

[0046] S31, place the high-strength flat steel bar 1 on the fire-working platform with the ball head of the high-strength flat steel bar 1 facing upward; place the round steel column 3 on the ball head side and the opposite web side of the high-strength flat steel bar 1 to fix the high-strength flat steel bar 1.

[0047] S32, Determine the flame-baking area. The flame-baking area is on one side of the ball head of the high-strength flat steel 1. The distance between the center of the flame-baking area and the side of the high-strength flat steel 1 connected to the low-strength flat steel 2 is L. Bake the determined flame-baking area. Use a hammer to strike one side of the ball head of the high-strength flat steel 1 so that the line connecting the first connection point 41 and the second connection point 42 is on the same straight line as the bottom edge of the web of the high-strength flat steel 1, and the line connecting the first connection point 41 and the third connection point 43 is perpendicular to the bottom edge of the web of the high-strength flat steel 1.

[0048] The error in which the line connecting the first connection point 41 and the second connection point 42 coincides with the bottom edge of the web of the high-strength flat steel 1 is less than 1 mm.

[0049] One round steel column 3 is provided on one side of the ball head of the high-spherical flat steel 1, and two round steel columns 3 are provided on one side of the web of the high-spherical flat steel 1; the fire-working platform is a porous steel platform.

[0050] When the high-density spherical flat steel 1 and the low-density spherical flat steel 2 are butted together, the side of the high-density spherical flat steel 1 that is butted together with the low-density spherical flat steel 2 is perpendicular to the bottom edge of the web of the high-density spherical flat steel 1. By treating the connecting side of the high-density spherical flat steel 1, parallel butt welding of the high-density and low-density spherical flat steels is achieved, which reduces the stress after welding and improves the connection quality after welding.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A processing method for transition welding of flat spherical steel with high and low differences, characterized in that, The method specifically includes the following steps: S1, Measure the height of the high-spherical flat steel and the low-spherical flat steel, and calculate the height difference D between the high-spherical flat steel and the low-spherical flat steel; S2, calculate the transition section length L based on the height difference between the high-spherical flat steel and the low-spherical flat steel in S1, and mark the cutting area on the web end face of the high-spherical flat steel according to the height difference D and the transition section length L. The specific steps for defining the cutting area are as follows: S21, place the high-ball flat steel with the ball head facing down, and measure the first connection point on the web end face of the high-ball flat steel connected to the low-ball flat steel. S22, draw an arc with the first connection point as the center and a radius of L. The arc intersects the side of the web away from the ball head at the second connection point. Connect the first connection point and the second connection point. The line connecting the first connection point and the second connection point forms the first cutting area with the side of the web. S23, with the first connection point as the foot of the perpendicular, draw a straight line perpendicular to the line connecting the first connection point and the second connection point. The straight line perpendicular to the line connecting the first connection point and the second connection point intersects the ball head of the high-strength flat steel at the third connection point. Connect the first connection point and the third connection point. The line connecting the first connection point and the third connection point forms the second cutting area with the side of the web. S3, After the cutting area is marked out, the cutting area is cut, and the area of ​​the cut high-strength flat steel is processed. S4. After the over-processing is completed, the high-ball flat steel at the over-processed end is welded to the side of the low-ball flat steel to complete the butt welding of the high-ball flat steel and the low-ball flat steel.

2. The processing method for transition welding of spherical flat steel with high and low differences according to claim 1, characterized in that, The heights of the high-strength and low-strength ball flat steels are the sum of the heights of the web and the ball head of the ball flat steel. The height of the high-strength ball flat steel is H1, and the height of the low-strength ball flat steel is H2. The height difference D between the high-strength and low-strength ball flat steels is D = H1 - H2.

3. The processing method for transition welding of ball flat steel with high and low differences according to claim 1, characterized in that, The specific formula for calculating the length L of the transition section is: L = 10D.

4. The processing method for transition welding of ball flat steel with high and low differences according to claim 1, characterized in that, The specific steps for cutting the cutting area in S3 are as follows: cut off the first and second cutting areas on the high-strength flat steel along the lines connecting the first and second connection points and the first and third connection points respectively, using a flame cutting torch, and the flatness of the cut surface is less than 1mm.

5. The processing method for transition welding of spherical flat steel with high and low differences according to claim 4, characterized in that, The specific steps for transition processing of the cut high-strength flat steel area in S3 are as follows: S31, place the high-strength ball flat steel on the fire-working platform with the ball head facing upwards; place the round steel column on one side of the ball head and the opposite side of the web of the high-strength ball flat steel to fix the high-strength ball flat steel. S32, Determine the flame-baking area. The flame-baking area is on one side of the high-strength ball flat steel ball head. The distance between the center of the flame-baking area and the side of the high-strength ball flat steel connected to the low-strength ball flat steel is L. Bake the determined flame-baking area. Use a hammer to strike one side of the high-strength ball flat steel ball head so that the line connecting the first connection point and the second connection point is on the same straight line as the bottom edge of the web of the high-strength ball flat steel. The line connecting the first connection point and the third connection point is perpendicular to the bottom edge of the web of the high-strength ball flat steel.

6. The processing method for transition welding of spherical flat steel with high and low differences according to claim 5, characterized in that, The error in the line connecting the first connection point and the second connection point coinciding with the bottom edge of the web of the high-strength flat steel is less than 1mm.

7. The processing method for transition welding of spherical flat steel with high and low differences according to claim 5, characterized in that, A round steel column is provided on one side of the ball head of the high-strength flat steel, and two round steel columns are provided on one side of the web of the high-strength flat steel; the fire-working platform is a porous steel platform.

8. The processing method for transition welding of spherical flat steel with high and low differences according to claim 1, characterized in that, When the high-spherical flat steel and the low-spherical flat steel are butted together, the side of the high-spherical flat steel and the low-spherical flat steel being butted together is perpendicular to the bottom edge of the web of the high-spherical flat steel.

Images