RU2343469C2 - Weld joint tracker - Google Patents

Abstract

FIELD: physics; measurement.

SUBSTANCE: application: for weld joint tracking. Substance: consists that monitored pipe weld joint tracker contains hangers of electromagnetic-acoustical transformers and inductive sensors on ultrasonic check frame, as well as hanger drives. Hanger of inductive sensors is mounted on pneumatic actuator rod fixed on ultrasonic check frame on centre of vertical axis of monitored pipe symmetrically with hangers of electromagnetic-acoustical transformers. Hanger of inductive sensors is "П"-shaped fork pivotally connected to the frame pivotally connected to hanger platform containing at least two inductive sensors symmetric with horizontal axis of controlled pipe and weld joint over fixed distance from surface of controlled pipe. And in frame corners there are spherical bearing supports mounted. Inductive sensors are mounted relative to traced weld joint with overlapping providing 2d>d_w, where d is diameter of inductive sensor, d_w is maximum width of weld joint. Inductive sensors are arranged in layout plan as distanced d/2 symmetrically with axes of controlled weld joint and distanced a≥d along its axis.

EFFECT: provided reliable tracking of pipe weld joint in ultrasonic check.

5 dwg

Description

The present invention relates to the field of non-destructive quality control of products of the metallurgical industry with the use of electromagnetic-acoustic transducers and can be used in ultrasonic testing of welded pipes with transverse or oblique (spiral) seams to monitor the weld.

A known installation for non-contact ultrasonic testing of long products and pipes, in which, in order to protect electromagnetic-acoustic transducers (EMAT) from damage when the control object (OK) passes under them, the latter are equipped with mechanisms for raising and lowering the surface of the control object [1].

However, it is impossible to completely exclude EMAT damage in the known invention, since there are always external defects on the OK surface that protrude beyond the OK surface, for example, peeling or rolled mill scale, which can damage the protective ceramic plate separating the EMAT inductor from the OK at any time during monitoring.

Known servo drive containing a measuring module, which is mounted on a shaft connected to a movement mechanism and which is the center and axis of swing of the measuring module [2]. The disadvantage of the known module is the hard contact of the EMAT working surface with OK, the large weight and complexity of the design.

Known EMAT, in which the hub housing is mounted on the hollow cylinder with two hinges and a frame, one hinge connects the hub housing with the frame, and the other hinge connects the frame to the hollow cylinder, the housing in the central part is made in the form of a cylinder and is equipped with a plate to which is attached substrate. [3]. A disadvantage of the known EMAT is the rigid connection of the EMAT housing to the substrate, which accounts for all the shock loads from the OK side when it passes under the EMAT and, as a result, the EMAT is not vulnerable to damage.

A common disadvantage of the known devices is the impossibility in the case of ultrasonic testing of welds on pipes for tracking oblique (spiral) welds.

The task of the invention is the reliable tracking of the weld on the pipe with ultrasonic testing.

This is achieved by the fact that in a device for tracking a weld of a controlled pipe, which includes suspensions of electromagnetic-acoustic transducers and inductive sensors on an ultrasonic control installation frame and drives of suspensions, the suspension of inductive sensors is mounted on a pneumatic cylinder rod mounted on an ultrasonic control installation frame in the center of a vertical axis of the controlled pipe symmetrically with respect to suspensions of electromagnetic-acoustic transducers, made in the form of a U-shaped plug, soy pivotally coupled to a frame that is pivotally connected to a suspension platform on which at least two inductive sensors are mounted symmetrically with respect to the horizontal axis of the pipe and the weld at a fixed distance from the surface of the pipe under control, and spherical supports are installed at the corners of the frame, while the inductive sensors are set relative to the monitored weld with overlapping, under which the condition 2d> d _w is satisfied, where d is the diameter of the inductive sensor, d _w is the maximum width of the welded of the weld, and in the plan are located at a distance d / 2 symmetrically to the axis of the controlled weld and at a distance a> d. along its axis.

Description of drawings

Figure 1 is a General view of the location of the transducers and devices for tracking the weld of a controlled pipe on the installation frame of ultrasonic testing;

figure 2 is a view In (section aa) on the side of the device for tracking the weld of a controlled pipe;

figure 3 is a section aa, a plan view of a device for tracking the weld of a controlled pipe;

4 is a view B (view C) on the side of the device for tracking the weld of a controlled pipe.

5 is a diagram of the movement of the suspension 3 with sensors 4 relative to the weld 1, where h _a and h _b are the distances of the sensor “A” and sensor “B” from the active part to the crest of the weld when they are offset relative to the axis of symmetry of the weld 1 .

Description of the design of a device for tracking the weld of a controlled pipe.

A device for tracking a weld seam 1 of a controlled pipe 2 comprises a suspension 3 of inductive sensors 4 mounted on a frame 5 of an ultrasonic control unit (not shown conventionally), drive 6 of a suspension 3 (for example, pneumatic cylinders) of inductive sensors 4.

The suspension 3 of inductive sensors 4 is mounted on the rod 7 of the pneumatic cylinder 6, mounted on the frame 5 of the ultrasonic control unit in the center of the vertical axis of the controlled pipe 2 symmetrically relative to the suspensions 9 of the electromagnetic-acoustic transducers 10.

The suspension 3 is made in the form of a U-shaped plug 11 connected by hinges 12 to the frame 13, which is connected by hinges 14 to the platform 15 of the suspension 3, on which inductive sensors 4 are mounted symmetrically with respect to the horizontal axis of the controlled pipe 2, and spherical supports are mounted at the corners of the frame 13 16, while the inductive sensors 4 are installed relative to the monitored weld 1 with an overlap under which the condition 2d> d _w is fulfilled, where d is the diameter of the inductive sensor 4, d _w is the maximum width of the weld 1, and in the plan are located on distance d / 2 is symmetrical to the axis of the controlled weld 1 and at a distance a> d. along its axis.

The principle of operation of the device

Inductive sensors 4 are located perpendicular to the surface of the pipe 2. The distance from the active part of the sensors to the surface of the pipe 2 is 8 mm.

When the device moves (along arrow "C" of Fig. 3) along the rotating pipe 2, the automation ensures a constant distance from the active part of the sensors 4 to the surface of the pipe 2.

Data on the distance to the surface of the pipe 2 and the roller 17 reinforcing the seam 1 is continuously recorded by inductive sensors 4.

When the roller 17 reinforcing the weld 1 at the same distance from both inductive sensors 4, their output signals are equal.

When the suspension 3 with the sensors 4 in any direction from the axis of the weld 1, the signals of the inductive sensors 4 are different.

To assess the displacement of the suspension 3 with sensors 4 in one direction or another, the difference between the readings of the sensor "A" and the sensor "B" (under common position 4) is used

According to the scheme in figure 5, we have:

1. When the suspension 3 is located on the axis of the weld 1, the difference in the readings of the sensors 4 located on different sides of the axis of the weld 1 is zero (pos. I, h _a = h _b , “A” = “B”)

2. When the roller 17 of the weld seam 1 is shifted towards the sensor “A”, the difference in the readings of the sensors “A” and “B” becomes negative, since the distance to the surface of the pipe 2 along the axis of the sensor “A” is less (there is a roller under the sensor “A” 17 reinforcement of the weld 1). (pos. II, h _a <h _b , "A"<"B")

3. When the roller 17 of the weld seam 1 is shifted towards the sensor “B”, the difference in the readings of the sensors “A” and “B” becomes positive, since the distance to the surface of the pipe 2 along the axis of the sensor “A” is greater (there is a roller under the sensor “A” 17 reinforcement of the weld 1). (pos. III, h _a > h _b , "A">"B")

The difference in the readings of the sensors "A" and "B" is processed by the automation controller program. This value is fed to the input of the controller, which generates control signals for shifting the suspension 3 with the sensors 4 so that the reinforcement bead 17 of the weld 1 is between the sensors "A" and "B", that is, at an equal distance from them (Figure 4 ) axis of symmetry D.

The proposed device allows for reliable ultrasonic testing of welds on pipes.

Tests of the device showed its high reliability in operation.

Information sources

1. RF patent No. 2238553.

2. RF patent №2259502.

3. RF patent No. 2247979.

Claims (1)

A device for tracking a weld of a controlled pipe, including suspensions of electromagnetic-acoustic transducers and inductive sensors on the frame of the ultrasonic control unit and suspension drives, characterized in that the suspension of inductive sensors is mounted on the rod of the pneumatic cylinder mounted on the frame of the ultrasonic control unit in the center of the vertical axis of the controlled pipes, symmetrically with respect to suspensions of electromagnetic-acoustic transducers, made in the form of a U-shaped plug, pivotally with a frame that is pivotally connected to the suspension platform, on which at least two inductive sensors are mounted at a fixed distance from the surface of the pipe to be inspected symmetrically with respect to the horizontal axis of the pipe and the weld, and spherical supports are installed at the corners of the frame sensors mounted relative to the monitored weld overlap, wherein the condition 2d> d _w, where d - diameter of the inductive sensor, d _m - maximum width of welded va, but in terms of spaced d / 2 symmetrically axis controlled weld and a≥d distance along its axis.

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