Steel structure welding process based on temperature monitoring

Abstract

The application discloses a steel structure welding process based on temperature monitoring, which is welded through a welding system and comprises the following steps: S1, a current of a welding gun is acquired, a temperature detection unit detects temperatures of various angles of a corresponding welding seam area, and an average value of the detected temperatures is calculated; S2, when a difference between the average value of the detected temperatures and a temperature value corresponding to the stored welding current is within + / -20 DEG C, the welding gun continues to weld; when the difference between the average value of the detected temperatures and the temperature value corresponding to the stored welding current is within a set range, a welding current of the welding gun is adjusted until the average value of the detected temperatures is within the allowable difference range of + / -20 DEG C; and when the difference between the average value of the detected temperatures and the temperature value corresponding to the stored welding current is above + / -40 DEG C, the welding current of the welding gun and a temperature of a welding heat preservation mechanism are adjusted until the average value of the detected temperatures is within the allowable difference range of + / -20 DEG C. The application solves the problems of temperature monitoring and regulation in a steel structure production welding process.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding technology. More specifically, this invention relates to a steel structure welding process based on temperature monitoring. Background Technology

[0002] The welding temperature field refers to the temperature distribution at various points on the weldment during the welding process, which is a function of space and time. The temperature distribution at various points on the weldment at a given instant can be represented by the welding temperature field. Many factors influence the temperature field, such as the nature and power of the heat source, the thermophysical properties of the metal being welded (thermal conductivity, etc.), and welding process parameters.

[0003] Excessive welding temperature can easily cause thermal deformation, resulting in excessive molten metal at the weld edge that is difficult to expel. Conversely, if the temperature is too low, low-temperature welding will result in only localized melting at the weld edge, making it difficult to guarantee weld quality. Therefore, the distribution of the welding temperature field reflects the welding quality of complex welding processes to a certain extent and directly affects weld formation. Dynamically acquiring the welding temperature during the welding process and adjusting welding parameters accordingly can effectively improve welding quality and is of great significance to welding technology. Summary of the Invention

[0004] The purpose of this invention is to provide a steel structure inspection method based on computer vision technology to solve the problem of temperature monitoring and control during the steel structure production and welding process.

[0005] The technical solution adopted by this invention to solve this technical problem is: a steel structure welding process based on temperature monitoring, which involves welding through a welding system, including:

[0006] S1. Obtain the current welding current of the welding torch, and the temperature detection unit detects the temperature at each angle of the corresponding weld area and calculates the average value of the detected temperature.

[0007] S2. Obtain the temperature value corresponding to the current welding current stored in the temperature compensation unit and compare it with the average detected temperature; compare the difference between the average detected temperature and the temperature value corresponding to the stored welding current, and adjust the current welding torch parameters and / or the temperature of the welding insulation mechanism according to the difference range until the temperature detection unit detects that the temperature of the corresponding weld area is within the allowable difference range.

[0008] Preferably, step S2 further includes:

[0009] a. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±20℃, it is within the allowable difference range, and the welding torch continues to weld;

[0010] b. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±(20℃~40℃), adjust the welding current of the welding torch until the average detected temperature is within the allowable difference range of ±20℃.

[0011] c. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is greater than ±40℃, adjust the welding current of the welding torch and the temperature of the welding heat preservation mechanism until the average detected temperature is within the allowable difference range of ±20℃.

[0012] Preferably, if the welding current of the welding torch and the temperature of the welding heat preservation mechanism reach the upper / lower limit of the set range in step c, and the average temperature is still not within the allowable difference range, the height L and tilt angle α of the welding torch are adjusted simultaneously.

[0013] Preferably, the height L of the welding torch in step c is adjusted to a height range of 0.7L to 1.3L; and the tilt angle α of the welding torch is adjusted to a height range of 0.8α to 1.2α.

[0014] The welding current I can be adjusted from 0.8I to 1.2I, and the temperature T of the welding insulation mechanism can be adjusted from 0.6T to 1.4T.

[0015] Preferably, the welding system includes:

[0016] Main control unit;

[0017] Temperature detection unit, used to detect the temperature of the weld area at various angles in real time;

[0018] The temperature compensation unit stores welding temperature values ​​corresponding to different welding currents;

[0019] The welding torch control system is used to adjust the welding current of the welding torch;

[0020] The welding torch adjustment mechanism is used to adjust the height and tilt angle of the welding torch;

[0021] Welding insulation mechanism, used for insulation and heating of steel structures;

[0022] Preferably, the temperature detection unit includes several infrared imagers.

[0023] Preferably, the welding system also includes a base.

[0024] The welding insulation mechanism is mounted on the base and includes a shell with a receiving groove for placing steel components. A circulation pipe is arranged along the side wall of the receiving groove. Heating elements are provided on the inward side of the circulation pipe and at the bottom of the receiving groove. The circulation pipe is arranged in a serpentine pattern around the receiving groove from bottom to top. The liquid inlet of the circulation pipe is at the top, and the liquid outlet is at the bottom. An insulation layer is provided on the outer wall of the receiving groove. The temperature detection unit is mounted on the base via an XYZ three-axis guide rail. The temperature detection unit consists of a bracket and several infrared imagers. The bracket is connected to the XYZ three-axis guide rail and is parallel to the width direction of the welding insulation mechanism shell. Several infrared imagers are evenly spaced on the bracket.

[0025] Preferably, the base has adjustable support legs.

[0026] Preferably, the circulation pipe is arranged in a spiral shape, and its top view is a frame structure. The length and width of the circulation pipe are slightly larger than the length and width of the receiving groove.

[0027] Preferably, the heating element is in five groups, respectively disposed on the four sides of the circulation pipe and the bottom of the receiving groove, and the shape of the heating element is the same as the corresponding side of the circulation pipe / bottom of the receiving groove.

[0028] The present invention has at least the following beneficial effects: the main control unit monitors and controls the temperature during steel structure welding in real time, solves the problem of temperature monitoring and regulation in the steel structure production welding process, controls the welding temperature error within ±20℃, and improves the welding quality of steel structures.

[0029] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0030] Figure 1 This is a top view of the steel structure inspection system of the present invention;

[0031] Figure 2 This is a schematic diagram of the base and welding insulation mechanism of the present invention;

[0032] Figure 3 This is a schematic diagram of the welding insulation mechanism of the present invention;

[0033] Figure 4 This is a schematic diagram of the steel structure and ribs of the present invention.

[0034] Explanation of reference numerals in the attached drawings: 1 steel structure, 2 rib plate, 3 receiving groove, 4 base, 5 circulation pipe, 6 heating element, 7 XYZ three-axis guide rail, 8 bracket, 9 insulation layer, 10 liquid inlet, 11 liquid outlet. Detailed Implementation

[0035] The present invention will now be described in detail and completely with reference to the embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the embodiments, it should be particularly noted that the technical solutions and features provided in the various parts of the present invention, including the following description, can be combined with each other without conflict.

[0036] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation plan are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified.

[0037] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0038] like Figure 1 As shown, this application discloses a temperature-monitored welding process for a steel structure 1. The process involves welding using a welding system to weld several ribs 2 onto the steel structure 1. During the welding process, the welding temperature needs to be strictly monitored, and parameters such as the welding torch current need to be adjusted in a timely manner to ensure welding quality. Specifically, the process includes:

[0039] S1. The main control unit acquires the current welding current of the welding torch, and the temperature detection unit detects the temperature at each angle of the corresponding weld area and calculates the average value of the detected temperature.

[0040] S2. Obtain the temperature value corresponding to the current welding current stored in the temperature compensation unit and compare it with the average detected temperature; compare the difference between the average detected temperature and the temperature value corresponding to the stored welding current, and adjust the current welding torch parameters and / or the temperature of the welding insulation mechanism according to the difference range until the temperature detection unit detects that the temperature of the corresponding weld area is within the allowable difference range.

[0041] a. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±20℃, it is within the allowable difference range, and the welding torch continues to weld;

[0042] b. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±(20℃~40℃) (including 40℃, excluding 20℃), adjust the welding current of the welding torch. This is a fine adjustment until the average detected temperature is within the allowable difference range of ±20℃.

[0043] c. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is greater than ±40℃ (excluding 40℃), adjust the welding current of the welding torch (fine adjustment at this time) and the temperature of the welding heat preservation mechanism until the average detected temperature is within the allowable difference range of ±20℃.

[0044] In the above technical solution, the main control unit monitors and controls the temperature of the steel structure 1 in real time during welding, solves the problem of temperature monitoring and regulation in the production and welding process of the steel structure 1, controls the welding temperature error within ±20℃, and improves the welding quality of the steel structure 1.

[0045] In another technical solution, if the welding current of the welding torch and the temperature of the welding heat preservation mechanism in step c reach the upper / lower limit of the set range, and the average temperature is still not within the allowable difference range, the height L and tilt angle α of the welding torch can be adjusted simultaneously to adjust the welding temperature more quickly.

[0046] In another technical solution, the height L of the welding torch in step c is adjusted to a height range of 0.7L to 1.3L; the tilt angle α of the welding torch is adjusted to a height range of 0.8α to 1.2α.

[0047] The welding current I can be adjusted from 0.8I to 1.2I, and the temperature T of the welding insulation mechanism can be adjusted from 0.6T to 1.4T.

[0048] In another technical solution, such as Figure 1 As shown, the welding system includes:

[0049] Main control unit;

[0050] Temperature detection unit, used to detect the temperature of the weld area at various angles in real time;

[0051] The temperature compensation unit stores welding temperature values ​​corresponding to different welding currents;

[0052] The welding torch control system is used to adjust the welding current of the welding torch;

[0053] The welding torch adjustment mechanism is used to adjust the height and tilt angle of the welding torch;

[0054] Welding insulation mechanism, used for insulation and heating of steel structure 1.

[0055] In another technical solution, the temperature detection unit includes several infrared imagers.

[0056] In another technical solution, the welding system further includes a base 4;

[0057] like Figures 2-4As shown, the welding insulation mechanism is mounted on the base 4. The welding insulation mechanism includes a shell with a receiving groove 3 for placing steel components. A circulation pipe 5 is arranged along the side wall of the receiving groove 3. Heating elements 6 are arranged on the inward side of the circulation pipe 5 and at the bottom of the receiving groove 3. The circulation pipe 5 serves as the supporting frame for the heating elements 6 on the side. When the circulation pipe 5 and the heating elements 6 are arranged, their length and width are as similar as possible to the side of the corresponding receiving groove 3, so as to cover the steel structure 1 as much as possible and achieve heating and cooling of the steel structure 1. The circulation pipe 5 is arranged in a serpentine shape from bottom to top. The circulation pipe 5 is positioned around the accommodating tank 3, with its inlet 10 at the top and outlet 11 at the bottom, ensuring faster cooling of the upper part of the steel structure 1 and more uniform heating of the entire steel structure 1. The outer wall of the accommodating tank 3 is provided with an insulation layer 9. The temperature detection unit is mounted on the base 4 via an XYZ three-axis guide rail 7. The temperature detection unit consists of a bracket 8 and several infrared imagers. The bracket 8 is connected to the XYZ three-axis guide rail 7 and is parallel to the width direction of the welded insulation mechanism shell. Several infrared imagers are evenly spaced on the bracket 8. The base 4 has adjustable legs. The circulation pipe 5 is spirally arranged, and its top view shows a frame structure. The length and width of the circulation pipe 5 are slightly greater than the length and width of the accommodating tank 3. Five sets of heating elements 6 are respectively located on the four sides of the circulation pipe 5 and the bottom of the accommodating tank 3. The shape of each heating element 6 is the same as its corresponding side surface of the circulation pipe 5 / bottom surface of the accommodating tank 3.

[0058] The welding system usage procedure is as follows:

[0059] The steel structure 1 and rib plate 2 are initially fixed and then placed in the welding insulation mechanism. The welding insulation mechanism heats the steel component to the set temperature. Then, the temperature detection unit is adjusted to the welding position relative to the rib plate 2 by the XYZ three-axis guide rail 7. After that, the welding gun position is adjusted to start welding. During the welding process, the welding gun current, welding gun height L and tilt angle α, and the temperature of the welding insulation mechanism are adjusted by the main control unit and the control method of this application. When it is necessary to reduce the temperature of the steel component, a low temperature medium is introduced into the circulation pipe 5 of the welding insulation mechanism and the heating element 6 is turned off, so that the high temperature of the steel structure 1 is cooled down by heat conduction.

[0060] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A steel structure welding process based on temperature monitoring, wherein welding is performed using a welding system, characterized in that, include: S1. Obtain the current welding current of the welding torch, and the temperature detection unit detects the temperature at each angle of the corresponding weld area and calculates the average value of the detected temperature. S2. Obtain the temperature value corresponding to the current welding current stored in the temperature compensation unit and compare it with the average detected temperature; compare the difference between the average detected temperature and the temperature value corresponding to the stored welding current, and adjust the current welding torch parameters and / or the temperature of the welding insulation mechanism according to the difference range until the temperature detection unit detects that the temperature of the corresponding weld area is within the allowable difference range. a. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±20℃, it is within the allowable difference range, and the welding torch continues to weld; b. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is within ±(20℃~40℃), adjust the welding current of the welding torch until the average detected temperature is within the allowable difference range of ±20℃. c. When the difference between the average detected temperature and the temperature value corresponding to the stored welding current is greater than ±40℃, adjust the welding current of the welding torch and the temperature of the welding heat preservation mechanism until the average detected temperature is within the allowable difference range of ±20℃; if the welding current of the welding torch and the temperature of the welding heat preservation mechanism in step c reach the upper / lower limit of the set range, and the average temperature is still not within the allowable difference range, simultaneously adjust the height L and tilt angle α of the welding torch. The height L of the welding torch in section c is adjusted to a range of 0.7L to 1.3L; the tilt angle α of the welding torch is adjusted to a range of 0.8α to 1.2α. The welding current I can be adjusted from 0.8I to 1.2I, and the temperature T of the welding insulation mechanism can be adjusted from 0.6T to 1.4T.

2. The steel structure welding process based on temperature monitoring as described in claim 1, characterized in that, The welding system includes: Main control unit; Temperature detection unit, used to detect the temperature of the weld area at various angles in real time; The temperature compensation unit stores welding temperature values ​​corresponding to different welding currents; The welding torch control system is used to adjust the welding current of the welding torch; The welding torch adjustment mechanism is used to adjust the height and tilt angle of the welding torch; Welding insulation mechanism, used for heat insulation and heating of steel structures.

3. The steel structure welding process based on temperature monitoring as described in claim 2, characterized in that, The temperature detection unit includes several infrared imagers.

4. The steel structure welding process based on temperature monitoring as described in claim 2, characterized in that, The welding system also includes a base; The welding insulation mechanism is mounted on the base and includes a shell with a receiving groove for placing steel components. A circulation pipe is arranged along the side wall of the receiving groove. Heating elements are provided on the inward side of the circulation pipe and at the bottom of the receiving groove. The circulation pipe is arranged in a serpentine pattern around the receiving groove from bottom to top. The liquid inlet of the circulation pipe is at the top, and the liquid outlet is at the bottom. An insulation layer is provided on the outer wall of the receiving groove. The temperature detection unit is mounted on the base via an XYZ three-axis guide rail. The temperature detection unit consists of a bracket and several infrared imagers. The bracket is connected to the XYZ three-axis guide rail and is parallel to the width direction of the welding insulation mechanism shell. Several infrared imagers are evenly spaced on the bracket.

5. The steel structure welding process based on temperature monitoring as described in claim 4, characterized in that, The base has adjustable support legs.

6. The steel structure welding process based on temperature monitoring as described in claim 4, characterized in that, The circulation pipe is arranged in a spiral shape, and its top view shows a frame structure. The length and width of the circulation pipe are slightly larger than the length and width of the receiving groove.

7. The steel structure welding process based on temperature monitoring as described in claim 6, characterized in that, The heating element consists of five groups, which are respectively arranged on the four sides of the circulation pipe and the bottom of the receiving groove. The shape of the heating element is the same as that of the corresponding side of the circulation pipe / bottom of the receiving groove.

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