A method for detecting weld seams of a composite panel

Abstract

The present application relates to the technical field of composite plate weld detection, and specifically relates to a composite plate weld detection method, and the specific detection method comprises the following steps: two first scanning parts complete detection on the near-surface of the weld, two second scanning parts complete detection on the whole weld, two third scanning parts complete left offset detection on the weld, two fourth scanning parts complete right offset detection on the weld, and two fifth scanning parts complete horizontal defect detection on the weld. In one detection process, the different scanning parts complete synchronous detection on the near-surface of the weld, the whole weld, the left offset of the weld, the right offset of the weld, and the horizontal defect of the weld section, so that the traditional three-time detection is replaced in one detection process, the detection efficiency is improved by 3 times, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of composite plate weld inspection technology, and specifically to a method for inspecting composite plate welds. Background Technology

[0002] TOFD (Time Difference of Fiber) testing technology is one of the latest ultrasonic testing technologies. Its main feature is that it uses ultrasonic diffraction and reflection signals to achieve the purpose of detection. The quantitative determination of defects depends not only on the amplitude of the signal, but also on the relatively high detection sensitivity. At the same time, this technology combines advanced data processing and image processing technology, which can achieve real-time imaging, making defect analysis clear and intuitive, and the detection data accurate, reliable and recordable. It also has some advantages of radiographic testing. In particular, for plate welded containers, due to their thinness and short delivery cycle, the workload of flaw detection during the remanufacturing process is large. Especially when manufacturing composite plate welded containers, considering the deformation of the cylinder, the convenience of welding, and the protection of the composite layer, the longitudinal and circumferential weld bevels are all built-in bevels with large bevel angles. Generally, TOFD testing is first performed on the substrate side, and then pulse reflection ultrasonic testing is used to compensate for near-surface testing, thereby completing the defect detection of this type of composite plate weld.

[0003] In existing inspection methods, TOFD inspection is generally performed on the substrate side first, followed by pulse-echo ultrasonic testing to compensate for near-surface defects. Both methods are single-channel scanning inspections. However, in actual inspections, the large blind zone near the weld surface makes it easy to miss near-surface defects. Furthermore, there is a lack of necessary synchronous inspection methods for transverse defects. Moreover, for offset inspections, a single weld needs to be inspected at least three times at different locations on the substrate side. In other words, multiple step-by-step operations are required for the same weld to meet different inspection requirements, which increases inspection time and reduces overall inspection efficiency.

[0004] Therefore, it is necessary to invent a method for inspecting weld seams in composite plates to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method for inspecting welds in composite plates. This method solves the problems in existing technologies where, during actual inspection, the large blind zone near the weld surface makes it easy to miss near-surface defects, and there is a lack of necessary synchronous inspection methods for transverse defects. Furthermore, for offset inspection, a single weld needs to be inspected at least three times at different locations on the substrate side. In other words, for the same weld, multiple step-by-step operations are required to adapt to different inspection requirements, which increases inspection time and reduces overall inspection efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for inspecting weld seams in composite plates includes a traveling frame that moves along the surface of the weld seam of the composite plate, comprising two first scanning sections, two second scanning sections, two third scanning sections, two fourth scanning sections, and two fifth scanning sections. The specific inspection method includes the following steps:

[0008] Step 1: Two first inspection sections symmetrically set along the weld seam of the composite plate complete the inspection of the near-surface of the weld seam;

[0009] Step 2: Two second inspection sections, symmetrically arranged along the weld seam of the composite plate, complete the inspection of the entire weld seam.

[0010] Step 3: Two third inspection sections symmetrically positioned along the weld seam of the composite plate complete the left-side offset inspection of the weld seam;

[0011] Step 4: Two fourth inspection sections symmetrically set along the weld of the composite plate complete the right-side offset inspection of the weld;

[0012] Step 5: Two fifth inspection sections located on both sides of the weld seam of the composite plate and spaced a certain distance apart laterally complete the transverse defect detection of the weld seam.

[0013] As a preferred embodiment of the present invention, the walking frame includes a first vertical rod and a second vertical rod that are hinged together, a first horizontal rod that is detachably connected to the non-hinged end of the first vertical rod, and a second horizontal rod that is detachably connected to the non-hinged end of the second vertical rod. Both ends of the first horizontal rod and the second horizontal rod are detachably connected to wheel sets that can travel along the surface of the weld seam of the composite plate.

[0014] In a preferred embodiment of the present invention, two first scanning parts are symmetrically arranged on the side of the first horizontal bar away from the first vertical bar, two second scanning parts are symmetrically arranged on the side of the second horizontal bar close to the first vertical bar, two third scanning parts are symmetrically arranged on the side of the second horizontal bar close to the first vertical bar, two fourth scanning parts are symmetrically arranged on the side of the second horizontal bar away from the first vertical bar, and two fifth scanning parts are respectively arranged on opposite sides of the first vertical bar and the second vertical bar, and are a certain distance apart.

[0015] As a preferred embodiment of the present invention, one of the two first scanning units, two second scanning units, two third scanning units, two fourth scanning units, and two fifth scanning units is a signal transmitting end and the other is a signal receiving end, and the weld detection is completed by ultrasonic pulse signal.

[0016] As a preferred embodiment of the present invention, the probe frequency, diameter, wedge angle and probe spacing of the two first scanning parts are selected according to the standard. The probe frequency, diameter, wedge angle and probe spacing of the third scanning part and the fourth scanning part are consistent with those of the first scanning part. However, the probe arrangement of the third scanning part is offset to the left of the weld according to the standard, and the probe arrangement of the fourth scanning part is offset to the right of the weld according to the standard.

[0017] As a preferred embodiment of the present invention, the probe frequency, diameter, wedge angle and probe spacing of the fifth scanning unit are consistent with those of the first scanning unit. The transverse defects of the weld are completed by rotating the first vertical rod and the second vertical rod to form an angle of less than 10 degrees with the weld to be inspected.

[0018] As a preferred embodiment of the present invention, the transverse centerlines of the first vertical rod and the second vertical rod are on the same plane as the weld.

[0019] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0020] This invention utilizes a traveling frame that moves along the weld seam of a composite plate to detect defects at different locations. When inspecting a specific location, the first scanning unit performs near-surface inspection on areas with large blind spots near the weld surface, while the second scanning unit inspects the entire weld section. Simultaneously, the third and fourth scanning units perform offset inspections on the left and right sides of the weld, respectively. During this synchronous process, the position of an additional fifth scanning unit can be controlled to detect transverse defects in the weld section. Thus, in a single inspection process, different scanning units simultaneously detect near-surface defects, the entire weld section, left-side offset defects, right-side offset defects, and transverse defects in the weld section. This replaces the traditional three-step inspection process in a single inspection, increasing inspection efficiency by three times. It eliminates the need for step-by-step inspections, thereby improving overall inspection efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention during the inspection state along the weld seam;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention under different angles during the inspection state along the weld seam.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. First vertical bar; 2. Second vertical bar; 3. First horizontal bar; 4. Second horizontal bar; 5. Wheel set. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0026] This invention provides, for example Figure 1-2 The method for inspecting weld seams in composite plates includes a traveling frame that moves along the surface of the weld seam, comprising two first scanning sections, two second scanning sections, two third scanning sections, two fourth scanning sections, and two fifth scanning sections. The specific inspection method includes the following steps:

[0027] Step 1: Two first inspection sections symmetrically set along the weld seam of the composite plate complete the inspection of the near-surface of the weld seam;

[0028] Step 2: Two second inspection sections, symmetrically arranged along the weld seam of the composite plate, complete the inspection of the entire weld seam.

[0029] Step 3: Two third inspection sections symmetrically positioned along the weld seam of the composite plate complete the left-side offset inspection of the weld seam;

[0030] Step 4: Two fourth inspection sections symmetrically set along the weld of the composite plate complete the right-side offset inspection of the weld;

[0031] Step 5: Two fifth scanning units located on both sides of the weld seam of the composite plate and laterally spaced at a certain distance complete the transverse defect detection of the weld seam. The walking frame also includes an encoder, handle and a water distributor for the scanner, which respectively realizes the recording of detection data, facilitates walking along the weld seam and delivers water and couples during detection.

[0032] The walking frame includes a hinged first vertical rod 1 and a second vertical rod 2, a first horizontal rod 3 detachably connected to the non-hinged end of the first vertical rod 1, and a second horizontal rod 4 detachably connected to the non-hinged end of the second vertical rod 2. Both ends of the first horizontal rod 3 and the second horizontal rod 4 are detachably connected to wheel sets 5 that can travel along the surface of the weld seam of the composite plate. A 360-degree movable joint is connected between the first vertical rod 1 and the second vertical rod 2. The movable joint has a self-locking function and a locking hole design. By adjusting the movable joint, the scanner can better fit the workpiece curvature, which is convenient for TOFD inspection.

[0033] Two first scanning sections are symmetrically arranged on the side of the first horizontal bar 3 away from the first vertical bar 1; two second scanning sections are symmetrically arranged on the side of the second horizontal bar 4 close to the first vertical bar 1; two third scanning sections are symmetrically arranged on the side of the second horizontal bar 4 close to the first vertical bar 1; two fourth scanning sections are symmetrically arranged on the side of the second horizontal bar 4 away from the first vertical bar 1; and two fifth scanning sections are arranged on opposite sides of the first vertical bar 1 and the second vertical bar 2, respectively, and are a certain distance apart. The scanning sections in different positions complete the weld inspection for different inspection requirements, thereby completing multiple inspection requirements in a single inspection process, replacing the traditional three-stage inspection.

[0034] Of the two first scanning sections, two second scanning sections, two third scanning sections, two fourth scanning sections, and two fifth scanning sections, one is a transmitting signal end and the other is a receiving signal end. The weld inspection is completed through ultrasonic pulse signals. The two ultrasonic probes are located symmetrically on both sides of the defect being inspected. When a defect is present, the receiving probe will receive the transverse waves generated at the defect point and the bottom surface due to waveform conversion. These transverse waves will arrive at the receiving sensor later than the reflected waves from the bottom surface, so the specific location of the defect can be determined based on the waveform.

[0035] According to the standard, the probe frequency, diameter, wedge angle, and probe spacing of the two first scanning sections are selected. The probe frequency, diameter, wedge angle, and probe spacing of the third and fourth scanning sections are consistent with those of the first scanning sections. However, the probe arrangement of the third scanning section is offset to the left of the weld according to the standard, and the probe arrangement of the fourth scanning section is offset to the right of the weld according to the standard. The first scanning section selected according to the standard uses a high-frequency probe with a diameter of φ3, a wedge angle of 70 degrees, and a probe spacing of 80-100mm. Of course, the smaller the probe spacing, the better, but the inspection width of the weld needs to be considered when selecting it in practice.

[0036] The probe frequency, diameter, wedge angle, and probe spacing of the fifth scanning unit are consistent with those of the first scanning unit. The only difference is that by rotating the first vertical rod 1 and the second vertical rod 2, an angle of less than 10 degrees is formed with the weld to be inspected, thus completing the inspection of transverse weld defects. By rotating and adjusting the movable joint, the first vertical rod 1 and the second vertical rod 2 are made to form a certain angle, thereby making the fifth scanning unit form an angle of less than 10 degrees with the weld.

[0037] The transverse centerlines of the first vertical rod 1 and the second vertical rod 2 are on the same plane as the weld. This ensures that the two first scanning parts, two second scanning parts, two third scanning parts, two fourth scanning parts, and two fifth scanning parts located at different positions are always symmetrical along the weld.

[0038] This invention utilizes a traveling frame that moves along the weld seam of a composite plate to detect defects at different locations. When inspecting a specific location, the first scanning unit performs near-surface inspection on areas with large blind spots near the weld surface, while the second scanning unit inspects the entire weld section. Simultaneously, the third and fourth scanning units perform offset inspections on the left and right sides of the weld, respectively. During this synchronous process, the position of an additional fifth scanning unit can be controlled to detect transverse defects in the weld section. Thus, in a single inspection process, different scanning units simultaneously detect near-surface defects, the entire weld section, left-side offset defects, right-side offset defects, and transverse defects in the weld section. This replaces the traditional three-step inspection process in a single inspection, increasing inspection efficiency by three times. It eliminates the need for step-by-step inspections, thereby improving overall inspection efficiency.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for inspecting weld seams in composite plates, the method being applied to a composite plate weld seam inspection device, the device comprising a traveling frame that travels along the surface of the composite plate weld seam, characterized in that: It includes two first scanning sections, two second scanning sections, two third scanning sections, two fourth scanning sections, and two fifth scanning sections. The specific detection method includes the following steps: Step 1: Two first inspection sections symmetrically set along the weld seam of the composite plate complete the inspection of the near-surface of the weld seam; Step 2: Two second inspection sections, symmetrically arranged along the weld seam of the composite plate, complete the inspection of the entire weld seam. Step 3: Two third inspection sections symmetrically positioned along the weld seam of the composite plate complete the left-side offset inspection of the weld seam; Step 4: Two fourth inspection sections symmetrically set along the weld of the composite plate complete the right-side offset inspection of the weld; Step 5: Two fifth inspection sections located on both sides of the weld seam of the composite plate and spaced a certain distance apart laterally complete the transverse defect detection of the weld seam; The walking frame includes a hinged first vertical rod (1) and a second vertical rod (2), a first horizontal rod (3) detachably connected to the non-hinged end of the first vertical rod (1), and a second horizontal rod (4) detachably connected to the non-hinged end of the second vertical rod (2). Both ends of the first horizontal rod (3) and the second horizontal rod (4) are detachably connected to wheel sets (5) that can travel along the surface of the weld seam of the composite plate. Two first scanning parts are symmetrically arranged on the side of the first horizontal bar (3) away from the first vertical bar (1), two second scanning parts are symmetrically arranged on the side of the second horizontal bar (4) close to the first vertical bar (1), two third scanning parts are symmetrically arranged on the side of the second horizontal bar (4) close to the first vertical bar (1), two fourth scanning parts are symmetrically arranged on the side of the second horizontal bar (4) away from the first vertical bar (1), and two fifth scanning parts are respectively arranged on opposite sides of the first vertical bar (1) and the second vertical bar (2) and are a certain distance apart. By rotating the first vertical bar (1) and the second vertical bar (2), an angle of less than 10 degrees is formed with the weld to be inspected to complete the transverse defect of the weld. Of the two first scanning units, two second scanning units, two third scanning units, two fourth scanning units, and two fifth scanning units, one is a signal transmitting end and the other is a signal receiving end, and the weld seam detection is completed through ultrasonic pulse signals.

2. The method for inspecting weld seams in composite plates according to claim 1, characterized in that: The probe frequency, diameter, wedge angle, and probe spacing of the two first scanning sections are selected according to the standard. The probe frequency, diameter, wedge angle, and probe spacing of the third and fourth scanning sections are consistent with those of the first scanning sections. However, the probe arrangement of the third scanning section is offset to the left of the weld according to the standard, and the probe arrangement of the fourth scanning section is offset to the right of the weld according to the standard.

3. The method for inspecting weld seams in composite plates according to claim 2, characterized in that: The probe frequency, diameter, wedge angle, and probe spacing of the fifth scanning unit are consistent with those of the first scanning unit.

4. The method for inspecting weld seams in composite plates according to claim 1, characterized in that: The transverse centerlines of the first vertical rod (1) and the second vertical rod (2) are on the same plane as the weld.

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