CN215297249U - Welding seam identification and detection device - Google Patents

Abstract

The utility model discloses a welding seam recognition and detection device, which comprises an eddy current detector, a first driving part, a probe and a second driving part; the utility model discloses in according to the base metal district of welding seam region, the conductivity of heat affected zone and welding seam district is different, when the detection module of first drive component drive eddy current detector passes through base metal district-heat affected zone-welding seam district-heat affected zone-base metal district in proper order, output conductivity signal, the position that minimum conductivity value corresponds is for the welding seam central point to realize the discernment of welding seam, then control second drive component drive probe to welding seam central point and put, utilize the probe to detect the welding seam region, like this the utility model discloses well discernment welding seam is not influenced by surface coating, even the welding seam surface is sheltered from by the coating, also can pinpoint welding seam district position, utilize the probe to carry out short-term test to this position, the device can realize welding seam automatic identification and detect fastly.

Description

Welding seam identification and detection device

Technical Field

The utility model relates to a welding seam shaping quality testing technique field, in particular to welding seam discernment and detection device.

Background

The aluminum alloy material is widely applied to the high-speed train body, the laser composite welding structure of the aluminum alloy train body is complex, the defects of cracks, incomplete penetration, incomplete fusion and the like can be caused frequently, the tensile strength and the fatigue strength of a welding line are influenced, and great potential safety hazards exist in the use process of the train body. Therefore, it is necessary to perform efficient, reliable and accurate detection and evaluation on the laser welding seam of the aluminum alloy sheet by adopting an advanced nondestructive detection method or technology.

In order to meet the quality of laser welding seams of aluminum alloy of a vehicle body, the welding seams are generally ground flat and are used for coating protection. For the weld joint which is polished flat or has a coating, the weld joint cannot be identified by human eyes, so that the difficulty is increased for detecting the weld joint.

How to realize the accurate positioning of the welding line before detection and the detection of the welding line quality is a technical problem to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can the automatic identification welding seam and detect welding seam discernment and detection device of welding seam defect.

The utility model provides a welding seam discernment and detection device, which comprises a frame, be provided with following part in the frame:

the welding seam identification assembly comprises an eddy current detector and a first driving component, wherein the first driving component is used for driving a detection module of the eddy current detector to transversely reciprocate, and the eddy current detector can acquire the minimum conductivity on a transverse path;

the welding seam detection assembly comprises a probe and a second driving component, the second driving component is used for driving the probe to a position corresponding to the minimum conductivity on the transverse path, and the probe is used for carrying out internal quality detection on materials near the position with the minimum transverse conductivity.

The utility model discloses in according to the base metal district of weld zone, the heat affected zone and the conductivity difference in weld zone, when the detection module of first drive component drive eddy current detector passes through base metal district-heat affected zone-weld zone-heat affected zone-base metal district in proper order, output conductivity signal, the position that minimum conductivity value corresponds is weld center position promptly to realize the discernment of welding seam, then control second drive component drive probe to weld center position, utilize the probe to detect the weld zone.

According to the above description, the utility model discloses well discernment welding seam does not receive the surface coating to influence, even the welding seam surface is sheltered from by the coating, also can pinpoint out welding seam district position, utilizes the probe to carry out short-term test to this position, and the device can realize that welding seam automatic identification and detection speed are fast.

Optionally, the welding line testing device further comprises an encoder and a pressing device, wherein the encoder is used for recording longitudinal displacement of the rack from the initial position of the welding line to the current position, and under the action of the pressing device, a rotating wheel of the encoder can be pressed with the surface of the workpiece to be tested in the working state.

Optionally, the pressing device includes a pressing spring, and the rotating wheel of the encoder abuts against the surface of the workpiece to be measured through the pressing spring.

Optionally, the rack is further provided with a guide device, and the guide device is matched with the vehicle body structure to form a slider-guide rail mode for guiding the rack along longitudinal movement.

Optionally, the guiding device includes at least one of a groove structure and a projection structure, and the groove structure is used for guiding in cooperation with a rib on the vehicle body or the side edge of the vehicle body; the lug structure is used for being matched with a longitudinal groove of a rib plate on a vehicle body for guiding; and the groove structure and the bump structure are mounted to the chassis by respective mounting arms.

Optionally, each of the mounting arms is adjustable in posture to adjust the orientation and position of the groove structure and the projection structure.

Optionally, a traveling mechanism is arranged at the bottom of the rack, and the traveling mechanism comprises at least one supporting roller.

Optionally, the first driving component includes a first stepping motor, an encoder of the first stepping motor records a position corresponding to the minimum electrical conductivity and feeds back the position information to the eddy current detector, and the second driving component includes a second stepping motor, and the encoder of the second stepping motor operates according to the position information output by the eddy current detector.

Optionally, in the transverse direction, the rack is provided with a first identification component and a second identification component, and the detection module of the eddy current detector reciprocates between the first identification component and the second identification component.

Optionally, the probe is a composite probe, and the composite probe has at least one of the following functions: the method is used for detecting root incomplete penetration defects based on a far-field eddy current technology, side wall incomplete fusion and surface crack defects based on a differential eddy current technology and a welding seam eddy current technology, and large pore defects or dense pore defects based on an absolute eddy current technology.

Drawings

FIG. 1 is a graph of transverse path conductivity distribution in an embodiment of the present invention;

FIG. 2 is a schematic view of the welding seam recognition and detection device provided by the present invention applied to the welding seam on the inner side of the roof;

FIG. 3 is an enlarged view of the point A in FIG. 2;

FIG. 4 is a top view of FIG. 2;

FIG. 5 is a schematic diagram of the state of the welding seam recognition and detection device applied to the welding seam outside the roof

FIG. 6 is an enlarged view of the point B in FIG. 5;

fig. 7 is a top view of fig. 5.

Wherein, in fig. 2 to 7:

1-a weld joint identification and detection device; 2-a revolute joint; 3-a mobile joint; 4-eddy current detector; 5-an encoder; 6-inside of vehicle roof; 7-bump structure; 8-vehicle roof inner side rib plate; 9-a first stepper motor; 10-a detection module; 11-a hold-down device; 12-vehicle roof inside weld; 13-weld joint identification strip; 14-inner side rib plate of the car roof; 15-an encoder; 16-vehicle roof inside weld; 17-a second stepper motor; 18-a probe; 19-an encoder; 20-a groove structure; 21-outside of vehicle roof; 22-roof edge; 23-vehicle roof outside weld; 24-vehicle roof outside weld.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 7, fig. 1 is a diagram illustrating a conductivity distribution of a transverse path according to an embodiment of the present invention; FIG. 2 is a schematic view of the welding seam recognition and detection device provided by the present invention applied to the welding seam on the inner side of the roof; FIG. 3 is an enlarged view of the point A in FIG. 2;

FIG. 4 is a top view of FIG. 2; FIG. 5 is a schematic view of the welding seam recognition and detection device provided by the present invention applied to the welding seam welding on the outer side of the roof; FIG. 6 is an enlarged view of the point B in FIG. 5; fig. 7 is a top view of fig. 5.

The utility model provides a welding seam discernment and detection device 1, the device can realize the automatic identification of welding seam and accomplish the detection of welding seam quality. The welding seam recognition and detection device 1 comprises a rack, and a welding seam recognition assembly and a welding seam detection assembly are arranged on the rack.

The welding seam identification assembly comprises the eddy current detector 4 and a first driving part 9, the first driving part 9 is used for driving a detection module 10 of the eddy current detector 4 to transversely reciprocate, it should be noted that before a welding seam is identified, the extending direction of the welding seam can be estimated in advance according to drawings or experience, and the movement direction of the detection module 10 of the eddy current detector 4 only needs to be not parallel to the length direction of the welding seam. The transverse directions described herein are with reference to the drawings, and it is generally preferred that the detection module 10 be perpendicular to the length of the weld.

The eddy current detector 4 is used to obtain conductivity information for the material at different locations along the transverse path and is able to obtain a minimum conductivity along the transverse path. Taking an aluminum alloy profile as an example, according to the difference of the electrical conductivity of the aluminum alloy base material area, the heat affected area and the weld joint area, the eddy current inspection module 10 scans along the vertical direction of the weld joint to obtain a relationship curve between each area and the electrical conductivity, as shown in fig. 1. The position corresponding to the conductivity minimum point in the graph 1 is the central position of the welding seam area, and the actual position of the welding seam is analyzed by monitoring the position of the signal minimum point, so that the problem of identifying and positioning the welding seam is solved.

The weld inspection assembly includes a probe 18 and a second drive member for driving the probe 18 to a transverse conductivity minimum position, the probe being used for internal quality inspection of material adjacent the transverse path conductivity minimum position. Internal defects of laser welding seams of aluminum alloy sheets are generally as follows: incomplete root penetration, incomplete side wall fusion, air hole defects and cracks. The probe herein may thus be a composite probe, capable of detecting at least one or several of the above. Namely, the composite probe can have the following functions: the method is characterized in that a far-field eddy current technology is adopted to detect the incomplete penetration defect of the root, a differential eddy current technology and a welding seam eddy current technology are adopted to detect the incomplete fusion of the side wall and the crack defect of the surface, and an absolute eddy current technology is adopted to detect the large pore defect or the dense pore defect. The different eddy current technologies are integrated to manufacture a composite probe capable of realizing laser welding seams of the aluminum alloy sheet, and different types of defects are detected.

The utility model discloses in according to the base metal district of weld zone, the conductivity difference in heat affected zone and weld zone, when the detection module 10 of 9 drive eddy current detector of first drive assembly 4 passes through base metal district-heat affected zone-weld zone-heat affected zone-base metal district in proper order, output conductivity signal, the position that minimum conductivity value corresponds is weld central point promptly and puts to realize the discernment of welding seam, then control second drive assembly drive probe to weld central point put, utilize the probe to detect the weld zone.

According to the above description, the utility model discloses well discernment welding seam does not receive the surface coating to influence, even the welding seam surface is sheltered from by the coating, also can pinpoint out welding seam district position, utilizes the probe to carry out short-term test to this position, and the device can realize that welding seam automatic identification and detection speed are fast.

Specifically, the first driving component comprises a first stepping motor 9, an encoder 15 of the first stepping motor 9 records a position corresponding to the minimum conductivity and feeds back the position information to the eddy current detector, the second driving component comprises a second stepping motor 17, and an encoder 19 of the second stepping motor 17 acts according to the position information output by the eddy current detector 4.

Generally, for a vehicle body, the weld seam is generally long, so that the movement direction of the frame can be basically predetermined.

In one embodiment, the weld joint identification and detection device 1 further comprises an encoder 5 and a hold-down device 11, wherein the encoder 5 is used for recording the longitudinal displacement from the initial frame of the weld joint, i.e. the encoder can record the length of the weld joint. And under the action of the pressing device 11, the rotating wheel of the encoder 5 can be pressed and attached to the surface of the workpiece to be detected in the working state. Can avoid rotating the wheel like this and being surveyed the surface and take off for it is driven along with the frame to rotate the wheel, and the detecting head of the encoder 5 of being convenient for acquires accurate rotation number of turns.

In the embodiment, the length of the welding seam is measured through the encoder 5, and the structure is simple and easy to implement.

In one embodiment, the pressing device may comprise a pressing spring, and the rotating wheel of the encoder 5 abuts against the surface of the workpiece to be measured through the pressing spring. That is, the rotating wheel of the encoder 5 can be pressed against the surface of the workpiece under test under the tension of the pressing spring. The compression spring can play a role in buffering in the movement of the frame on the basis of realizing the compression of the rotating wheel.

In the above embodiments, the frame may further be provided with a guiding device, and the guiding device cooperates with the vehicle body structure to form a slider-guide rail mode for guiding the frame along the longitudinal movement. It should be noted that the longitudinal direction in this document is defined by taking the weld shown in fig. 2 as an example, and the longitudinal direction refers to the length direction of the weld.

To present aluminum alloy automobile body, have on the automobile body with rib or the aluminum alloy edge of welding seam syntropy extension, can have recess or boss on the rib, consequently, the utility model provides a device discerns and when detecting the welding seam, can realize the direction with the help of the structure of automobile body self.

In order to meet the requirement of guiding the welding seam at different positions, the guiding device can comprise a groove structure 20 and a bump structure 7, wherein the groove structure 20 is used for being matched with a rib on the vehicle body or the side edge of the vehicle body for guiding.

The bump structure 7 is used for being matched with a longitudinal groove of a rib plate on a vehicle body for guiding. The bump structure 7 is mounted to the frame by means of a mounting arm.

The groove formations 20 and the lug formations 7 are each mounted to the frame by respective mounting arms. The installation arms are adjustable in posture and can be multi-section articulated arms, and the postures can be changed under the action of the driving piece so as to adjust the orientation and the position of the groove structures 20 and the bump structures 7. When in use, the posture of each mounting arm is adjusted according to the vehicle body structure, so that the convex block structure 7 or the concave groove structure 20 on the mounting arm can be matched with the corresponding vehicle body structure for guiding.

For example, a specific structure in which the mounting arm may include the root mobile joint 3 and the rotary joint 2 is given herein, although the mounting arm is not limited to the description herein.

Of course, the frame is provided with a first identification component and a second identification component between which the detection module 10 of the eddy current detector 4 reciprocates. When the recognition and detection device is used, an operator predicts the position of a welding seam, the first identification component and the second identification component are respectively arranged on two sides of the predicted welding seam, and the first driving component 9 can drive the detection module 10 to reciprocate between the two identification components through preset parameters.

The first identification component and the second identification component may be identification strips or other structures.

Use the utility model provides a device is applied to the inboard and outside welding seam discernment of roof and is detected as the example, further introduces guider's concrete structure.

Referring to fig. 2 to 4, the eddy current testing of the inner side weld of the roof includes the following steps:

step 1: the approximate position of the individual welding seams of the inner roof side 6 from the roof edge (not visible to the naked eye) is marked on the basis of the welding process drawing.

Step 2: the weld seam recognition and detection device is placed on the inner side 6 of the vehicle roof, the weld seam recognition and detection device 1 is adjusted, and the marked weld seam is located in the middle of the two weld seam identification strips 13. The joints such as the moving joint 3 and the rotating joint 2 are adjusted, the moving joint 3 can move in a reciprocating mode relative to the rack along the transverse direction to adjust the transverse position of the groove structure and the transverse position of the boss structure relative to the rack, and the rotating joint 2 can rotate around the joint of the rotating joint to enable the lug structure 7 of the second guiding device and the inner side rib plate 8 of the car roof to form a slider-guide rail mode for guiding, so that the welding seam identification and detection device can stably walk along the direction of the marked welding seam. After the adjustment is completed, the joints and the bump structures 7 are fixed.

And step 3: and opening the eddy current detector 4, and pushing the welding seam identification and detection device to detect after setting corresponding parameters of the detector. In the process, the detection module 10 is driven by the first driving part 9 to perform reciprocating scanning in the area between the two welding seam identification strips 13 all the time, and the probe 18 is driven by the second driving part to be positioned at the central position along the welding seam 12 on the inner side of the roof all the time until the detection of the welding seam 12 on the inner side of the roof is completed. Wherein the second drive means may be a stepper motor comprising a second stepper motor 17, an encoder 19 for the second stepper motor, the second stepper motor being formed with its encoder 19 control.

And 4, step 4: and (3) repeating the step (1) and the step (2) to enable the bump structure (7) to form a slide block-guide rail mode fit on the inner side rib plate (14) of the car roof. And (5) repeating the step (3) to finish the detection of the welding seam 16 on the inner side of the car roof.

In another embodiment, referring to fig. 5-7, the steps for detecting the weld seam on the outer side of the vehicle roof are as follows:

step 1: the approximate location of the individual weld seams on the outside of the vehicle roof from the edge of the vehicle roof is marked on the basis of the welding process drawing.

Step 2: the weld recognition and detection device 1 is mounted on the roof outer 21 such that the marked roof outer weld 23 is in the middle of the two weld identification strips. The joints of the moving joint 3, the rotating joint 2 and the like are adjusted, so that the groove structure 20 of the guide device and the roof edge 22 form a sliding block-guide rail mode matching. Ensuring that the detection device can travel smoothly along the marked roof outer weld 23. After adjustment is complete, the respective joint and groove structures 20 are fixed.

And step 3: and opening the eddy current detector 4, and after the corresponding parameters of the detector are set, pushing the welding seam identification and detection device 1 to perform detection. In the process, the detection module 10 is driven by the first welding seam identification driving part 9 to perform reciprocating scanning in the area between the two welding seam identification strips 13 all the time, and the probe 18 is driven by the second driving part 17 to be positioned at the center of the welding seam 23 on the outer side of the car roof until the detection of the welding seam 23 on the outer side of the car roof is completed.

And 4, step 4: repeating steps 1 and 2 to enable the groove structure 20 and the roof edge 22 to form a sliding block-guide rail mode matching. And (5) repeating the step (3) to finish the detection of the welding seam 24 at the outer side of the car roof.

In the above embodiments, at least one supporting roller is arranged at the bottom of the frame, so that the device can flexibly move on the vehicle body.

It is right above the utility model provides a welding seam discernment and detection device introduces in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. The welding seam recognition and detection device is characterized by comprising a rack, wherein the rack is provided with the following components:

the welding seam identification assembly comprises an eddy current detector (4) and a first driving component, wherein the first driving component is used for driving a detection module of the eddy current detector (4) to transversely reciprocate, and the eddy current detector (4) can acquire minimum conductivity on a transverse path;

the welding seam detection assembly comprises a probe (18) and a second driving component, wherein the second driving component is used for driving the probe to move to a position corresponding to the minimum conductivity on the transverse path, and the probe is used for carrying out internal quality detection on materials near the position with the minimum transverse conductivity.

2. The weld joint identifying and detecting device according to claim 1, further comprising an encoder and a pressing device (11), wherein the encoder is used for recording the longitudinal displacement of the frame from the initial position to the current position of the weld joint, and under the action of the pressing device (11), a rotating wheel of the encoder can be pressed against the surface of a workpiece to be detected in a working state.

3. The weld seam recognition and detection device according to claim 2, characterized in that the hold-down device (11) comprises a hold-down spring, by means of which the encoder wheel bears against the workpiece surface under test.

4. The weld joint identification and detection device according to claim 1, wherein the frame is further provided with a guide device, and the guide device is matched with a vehicle body structure to form a slide block-guide rail mode for guiding the frame along the longitudinal movement.

5. The weld seam identification and detection device according to claim 4, wherein the guiding means comprises at least one of a groove structure (20) and a projection structure (7), the groove structure (20) being adapted to cooperate with a rib or a side edge of the vehicle body for guiding; the bump structure (7) is used for being matched with a longitudinal groove of a rib plate on a vehicle body for guiding; and the groove formations (20) and the lug formations (7) are mounted to the chassis by respective mounting arms.

6. The weld joint identification and detection device according to claim 5, wherein each of the mounting arms is adjustable in attitude to adjust the orientation and position of the recess formation (20) and the projection formation (7).

7. The weld joint identifying and detecting device according to claim 1, wherein a traveling mechanism is provided at the bottom of the machine frame, and the traveling mechanism comprises at least one supporting roller.

8. The weld joint identifying and detecting device according to any one of claims 1 to 7, wherein the first driving part comprises a first stepping motor (9), an encoder of the first stepping motor records a position corresponding to minimum conductivity and feeds back the position information to the eddy current detector (4), and the second driving part comprises a second stepping motor (17), and the encoder of the second stepping motor acts according to the position information output by the eddy current detector (4).

9. The weld joint recognition and detection device according to any one of claims 1 to 7, wherein a first identification member and a second identification member are provided on the machine frame in the transverse direction, and a detection module of the eddy current detector (4) reciprocates between the first identification member and the second identification member.

10. The weld joint identification and detection device according to any one of claims 1 to 7, wherein the probe is a composite probe having at least one of the following functions: the method is used for detecting root incomplete penetration defects based on a far-field eddy current technology, side wall incomplete fusion and surface crack defects based on a differential eddy current technology and a welding seam eddy current technology, and large pore defects or dense pore defects based on an absolute eddy current technology.

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