A monitoring device for welding preheating temperature and interpass temperature based on an infrared thermal imager

Abstract

The utility model relates to a welding preheating temperature and interlayer temperature monitoring device based on an infrared thermal imager, which includes a temperature measurement module, a mechanical module, a motion module and a flexible track module. Among them, the temperature measurement area of the infrared thermal imager is adjusted through movable fixtures, support arms and a plane adjustment mechanism. The temperature measurement data of the infrared thermal imager is transmitted to a computer in real time through wireless transmission, so as to realize temperature monitoring. At the same time, a large range and preheating and interlayer temperature measurement during the welding process are realized through rolling gears, flexible tracks and the motion trajectory recording module in the infrared thermal imager. Based on the utility model, it is possible to realize the visualization and real-time monitoring of the welding preheating and interlayer temperature of high-strength steel with a large cold crack tendency, and provide means and basis for the digitalization and traceability of the quality control in the high-strength steel welding production process.

Description

Technical Field

[0001] This utility model relates to a method and device for monitoring welding preheating temperature and interpass temperature, which is particularly suitable for non-contact, visual, and real-time monitoring of welding preheating and interpass temperature during the welding process of high-strength steel with a high tendency to cold cracking and components with surface curvature. Background Technology

[0002] For low-alloy high-strength steel, when the wall thickness exceeds a certain limit or the yield strength exceeds 600 MPa, the material is more prone to cold cracking due to its inherent properties. The occurrence of cold cracks can affect the structural safety of the welded component. To avoid cold cracking, preheating is generally performed on both sides of the bevel within a range of 75-100 mm before welding, while simultaneously controlling the interpass temperature to prevent cold cracking caused by excessively rapid cooling of the weld joint.

[0003] Currently, the main methods for measuring welding preheating temperature and interpass temperature are contact thermocouple measurement and non-contact infrared thermometry. In the welding of high-strength steel, drilling is prohibited on the surface, making it impossible to embed thermocouples after drilling. Only surface-contact thermocouples can be used. Furthermore, when measuring components with curved surfaces, even magnetic thermocouples have poor surface adhesion, resulting in ineffective temperature measurements. During preheating of large components, the temperature in some areas may not meet welding process requirements due to the large preheating range. Using thermocouples for temperature monitoring requires deploying numerous thermocouples, and those located in the weld bead need to be removed before welding, impacting the efficiency of welding personnel. Infrared thermometry characterizes the energy state of a material through radiant energy, unaffected by surface curvature. However, traditional infrared thermometers can only measure the temperature of point areas, while infrared thermal imagers can provide real-time, visual temperature monitoring of a large welding area, allowing for the timely detection of abnormal temperature regions. Therefore, providing a large-scale, visualized, and real-time online welding temperature monitoring device has significant engineering value for ensuring the refined welding quality of high-strength steel. Utility Model Content

[0004] This invention proposes a visualized, real-time online monitoring system for preheating and interpass temperature, aiming to solve the current problem of large-scale, visualized real-time temperature monitoring of large high-strength steel components during welding preheating and interpass temperature monitoring.

[0005] To address the aforementioned technical problems, this utility model provides the following technical solution: a welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager, comprising a temperature measurement module, a mechanical module, a motion module, and a flexible track module. The temperature measurement module consists of an infrared thermal imager with an embedded wireless transmission device and a motion trajectory recording device, enabling the wireless transmission of measured data to a computer. Dedicated software can process the temperature results from the field of view captured by the infrared thermal imager, allowing for temperature monitoring of specific areas and large-scale welding processes.

[0006] The mechanical module consists of a movable clamp, a multi-axis support, a plane angle adjustment device, and a support fixing device. The infrared thermal imager is connected to the multi-axis support via the plane angle adjustment device and the movable clamp, thereby adjusting the measurement area of ​​the infrared thermal imager. The motion module consists of a limiting ring, a fixed shaft, and rolling gears fixed to the mechanical module.

[0007] The flexible track module consists of a flexible track and magnetic clamps. The rolling gears are connected to an external motor, allowing adjustment of the overall movement speed of the device based on the actual welding speed, thus enabling real-time monitoring of the preheating temperature and interpass temperature of the area to be welded.

[0008] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0009] 1. This utility model can adjust the position of the infrared thermal imager by using a multi-axis bracket and a plane angle adjustment device, thereby changing the measurement area of ​​the infrared thermal imager.

[0010] 2. By using rolling gears, an external motor, and a flexible track, the temperature measuring device can measure the temperature along the track path, thereby enabling the monitoring of the preheating temperature and interpass temperature of the area to be welded. At the same time, combined with the motion trajectory recording module of the infrared thermal imager, the correspondence between the measurement position and the temperature data can be realized.

[0011] 3. The location and temperature data of the measurement area are recorded in the computer via a wireless transmission device. The temperature data of each position in the field of view can be read by dedicated software, which provides a means and basis for the digitalization and traceability of quality control in the welding production process. Attached Figure Description

[0012] Figure 1 This is a front view of the overall structure of the temperature measuring module, mechanical module and motion module of the temperature measuring device of this utility model.

[0013] Figure 2 This is a side view of the overall structure of the temperature measuring module, mechanical module and motion module of the temperature measuring device of this utility model.

[0014] Figure 3This is a perspective view of the overall structure of the temperature measuring module, mechanical module, and motion module of the temperature measuring device of this utility model.

[0015] Figure 4 This is a schematic diagram of the overall structure of the flexible track module of the temperature measuring device of this utility model.

[0016] Figure 5 This is a schematic diagram showing the overall temperature cloud map of the weldment measured by the temperature measuring device of this utility model, the location of the manually added temperature monitoring line, and the temperature measurement characteristics of the monitoring line.

[0017] Figure 6 The temperature measuring device of this utility model is along Figure 5 Temperature results measured by the monitoring line.

[0018] Figure 7 This is a schematic diagram showing the overall temperature cloud map of the weldment measured by the temperature measuring device of this utility model, as well as the location of the manually added rectangular temperature monitoring area and the temperature measurement characteristics of that area.

[0019] The markings in the diagram are as follows: 1-Infrared thermal imager, 2-Support arm, 3-Support arm, 4-Support arm, 5-Support rod, 6-Fixed shaft, 7-Base plate, 8-Rolling gear, 9-Plane angle adjustment device, 10-Modible clamp, 11-Limit ring, 12-Plane angle adjustment device, 13-Flexible track, 14-Magnetic clamp, 15-Magnetic controller. Detailed Implementation

[0020] The following detailed description, in conjunction with the accompanying drawings, illustrates the specific implementation process of the technical solution of this utility model:

[0021] like Figures 1 to 7 As shown, the welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager in this utility model mainly consists of a temperature measurement module, a mechanical module, a motion module, and a flexible track module.

[0022] The temperature measurement module consists of an infrared thermal imager 1 with a motion trajectory recording module and wireless data transmission function.

[0023] The mechanical module consists of a first arm 2, a second arm 3, a third arm 4, a support rod 5, vertical plane angle adjustment devices 9 and 12, and a movable clamp 10. The infrared thermal imager 1 is connected to the vertical plane angle adjustment device 9, allowing for angle changes. The movable clamp 10 is also connected to the vertical plane angle adjustment device 9. The movable clamp 10 is connected to the first arm 2 via a rotating pin, enabling small-range plane adjustment. The first arm 2 is connected to the second arm 3 via a rotating pin, allowing for vertical movement. The second arm 3 is connected to the third arm 4 via a rotating pin, enabling vertical movement. The third arm 4 is connected to the horizontal plane angle adjustment device 12, allowing for fixation and planar rotation. The horizontal plane angle adjustment device 12 is connected to the support rod 5. The support rod 5 is connected to the base plate 7.

[0024] The motion module consists of a fixed shaft 6, a limiting ring 11, and a rolling gear 8. The rolling gear can be driven by an external motor.

[0025] The flexible track module consists of a flexible track 13, a magnetic clamp 14, and a magnetic controller 15. The track can be extended according to the measurement range.

[0026] Example 1: When measuring the preheating temperature and interpass temperature of the fixed welding area, only a temperature measuring module, a mechanical module, and a magnetic clamp are needed. The base plate 7 is fixed on the magnetic clamp 14. By adjusting the vertical plane angle adjustment device 9, the first support arm 2, the second support arm 3, and the horizontal plane angle adjustment device 12, the measurement field of view of the infrared thermal imager 1 is made to include the measurement area. The temperature of the measurement area is then recorded synchronously during preheating and welding. Simultaneously, temperature monitoring is performed on specific locations and areas using dedicated software. The temperature results on the optional monitoring line are as follows: Figure 5 and Figure 6 As shown, the temperature results on the self-selected monitoring surface are as follows: Figure 7 As shown, the color gradation can also be set to a specific color when the temperature is below or above the preheating and interlayer temperatures, thereby quickly distinguishing areas with abnormal temperatures through visualized test results.

[0027] Example 2: When measuring the preheating temperature and interpass temperature of a large welding area, a temperature measuring module, a mechanical module, a motion module, and a flexible track module are required. The rolling gear 8 is connected to the flexible track 13 and fixed by the magnetic clamp 14. By adjusting the vertical plane angle adjustment device 9, the first support arm 2, the second support arm 3, and the horizontal plane angle adjustment device 12, the measurement field of view of the infrared thermal imager 1 is made to include the measurement area. Before temperature measurement, the temperature measuring device is idling along the flexible track 13. The actual trajectory record of the temperature measurement area is formed by the motion trajectory recording module in the infrared thermal imager 1. Then, it returns to the origin and the movement speed of the external motor is adjusted to be synchronized with the welding speed, thereby realizing the synchronous monitoring and recording of the temperature measurement position and the temperature measurement result.

Claims

1. A welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager, characterized in that... An infrared thermal imager (1) with wireless data transmission function is fixed on a vertical plane angle adjustment device (9) to adjust the plane angle of the infrared thermal imager (1); a movable clamp (10) is connected to the vertical plane angle adjustment device (9) through a rotating pin, and the movable clamp (10) is connected to the first arm (2) through a rotating pin to achieve small-range plane adjustment of the movable clamp (10); the first arm (2) is connected to the second arm (3) through a rotating pin to achieve up and down movement of the first arm (2); the second arm (3) is connected to the third arm (4) through a rotating pin to achieve up and down movement of the second arm (3); the third arm (4) is connected to the horizontal plane angle adjustment device (12) to achieve fixation and plane angle adjustment rotation of the third arm (4); the horizontal plane angle adjustment device (12) is connected to the support rod (5), and the support rod (5) is fixed on the base plate (7); the above structure is used to adjust the measurement area of ​​the infrared thermal imager (1).

2. The welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager according to claim 1, characterized in that... The fixed shaft (6) and the limiting ring (11) are fixed on the base plate (7), and the rolling gear (8) is fixed on the fixed shaft (6).

3. The welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager according to claim 1, characterized in that... The flexible track (13) is connected by a magnetic clamp (14) and the magnetic force generation and demagnetization are controlled by a magnetic controller (15).

4. The welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager according to claim 1, characterized in that... The flexible track (13), magnetic clamp (14) and rolling gear (8) are combined to move the infrared thermal imager (1) so as to measure the temperature of the welding area along the track.

5. The welding preheating temperature and interpass temperature monitoring device based on an infrared thermal imager according to claim 1, characterized in that... An infrared thermal imager (1) with wireless data transmission function can synchronize temperature measurement data to a computer in real time and monitor welding preheating and welding temperature in real time through dedicated software.

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