SU1731553A1 - Apparatus for x-ray testing of welded seams of metal structures - Google Patents

Abstract

The use of x-ray control sheet sheets for coiled tanks when using the introscope as the X-ray receiver. SUMMARY OF THE INVENTION: The device comprises an article support mounted on the base and mounted on the longitudinal guides of the trolley 1 and the X-ray machine 7 driven from the drive. of which, a platform 4 and 5 is movable along the platform. At the same time, an X-ray unit 7 is placed on one of the platforms, and an introscope is placed on the other, which improves the working conditions of the flaw detectors. 1 tab., 5 Il. SL C 4 CO SL SL CO

Description

The invention relates to welding, in particular to the construction of an apparatus for X-ray inspection of welded joints of metal structures.

The aim of the invention is to increase the productivity in the control of sheet panels for rolled reservoirs when using introscope as an X-ray detector.

FIG. 1 shows an installation for X-ray inspection of welds, front view; in fig. 2 is the same. side view: in FIG. 3 is a view A of FIG. one; in fig. A is a section B-B in FIG. one; in fig. 5 - working part of the defect mark.

The installation for X-ray inspection of welds contains a driving carriage 1, on which additional guides 2 and 3 are placed, bearing platforms 4 and 5 with a drive 6 of their movement. On one site 4 an X-ray apparatus 7 is placed. To see through the welds of sheet panels of structural steel 3-18 mm thick, it is advisable to use an X-ray device of the RUGY20 brand. RUP-150. RUP-200, etc. At another site 5, an X-ray television introscope 8 is located that performs the function of a receiver and a converter of x-ray radiation into a video signal. In the proposed device, it is advisable to use standard X-ray introscopes of the RI-60TK.

In order to improve the quality and speed of control of welds, the upper movable platform 4 with the X-ray unit 7 is mounted on additional guides 2 located perpendicular to the main guides and made of two parallel I-beams with rails. These beams are rigidly connected to the trolley 1. The guide 3 is made in the form of a monobalk 9 with an element 10. increasing the lateral rigidity of the beam 9. which is also rigidly connected to the trolley 1. Thus the monobalk is a welded box beam of one vertical section is a rolling profile of I-section 11. And the second vertical wall and the lower and upper flanges are made of sheet metal. Moreover, by developing the cross section of the monobalk in the lateral direction by increasing the thickness and width of the shelves, the rigidity of the monobalk in the lateral direction was determined, during which the cart 1 during the replenishing of the welds did not skip the image of the weld on the TV screen and was stable without visible noise and bifurcation.

The stiffness of the beam is expressed by the relative deflection - the ratio of deflection in the lateral direction to the monobalk length. The value of the relative deflection is less than 1/2400 (see table).

The drive of pads 4 and 5 is made in the form of two circuits 12, mounted along the entire length of the guides and driven by one DC motor with a speed controller.

To ensure smooth and synchronous movement of X-ray equipment in the process of monitoring and, thus, improving the quality of control, the chain sag is set within 0.5% of the free chain length and is provided with tensioning devices 13 and several (in this case, three on each branch) m 14 chain, placed evenly on the length of both branches x chain.

To ensure the smoothness of the X-ray equipment movement, the chain stabilizer 14 is made in the form of a steel plate with bent and rounded ends with a width less than the length of the chain roller 12. If the chain sags more than 0.5%, the movement of the carts occurs irregularly, and the greater the chain sag, the greater the jumps. When sagging 0.6%, the sensitivity of the control drops by 3-4%, which is unacceptable.

The rotational speed control of the engine is provided for the purpose of controlling the speed of movement of the pads 4 and 5 with the X-ray unit 7 and the X-ray introscopy 8.

Controlling the speed of movement of sites 4 and 5. Which is synchronized in one direction, allows you to move the X-ray unit 7 and the X-ray television introscope 8 to the place where the control began, with a marching speed 15-20 times higher than the operating speed of the control controls to provide a specific, predetermined sensitivity of the control related to the thickness of the products to be welded (the thickness of the weld) and the speed of control with the following relationship:

K (-0.0076 D2 -0.0454 d + 3.28) Vr 1.9, where K is the sensitivity coefficient,%;

d - seam thickness, mm;

V - control speed, m / min.

This dependence is obtained by mathematical processing of the results of experiments conducted on the proposed device. Experiments were conducted with

using the X-ray unit RUP-120 and X-ray television introscopes.

Welded joints of structural steels of the grade Art. 3 and 09G2S 4-16 mm thick, made by mechanized methods of welding in protective gas and under a layer of flux. The control speed was varied up to 2.5 m / min. Moreover, for each of the thicknesses (4, 6.8, 10, 12, 14, and 16 mm), the threshold for detecting defects on the television screen with a fixed control is determined from a predetermined size and depth of the specially designed (reference) defects. Then the defect detection threshold was determined for these thicknesses at control rates of 0.5; 1.0; 2.0 and 2.5 m / min.

To protect the staff from x-rays, the installation is equipped with a biological protection system, made in the form of a screen 15 of leaded rubber. The screen is located on the periphery of the x-ray apparatus.

In order to provide convenient maintenance of the X-ray introscope 8, the drive platform 5 is made console-like, it is supported by two guide rollers 16 on a corner welded to the lower guide monobalke 9. The third support roller 17 is supported on the side surface of the monobalk. The drive platform 5 is connected to the chain 12 with the help of crackers 18. located on both sides of the carriage in the direction of movement.

Tensioning device 13 of the chain is made in the form of two plate brackets, inner 19 and outer 20, with slots in the side surfaces. The outer bracket 20 is welded to the guide beam, and the inner bracket 19, equipped with a pull screw 21 with nuts 22, is pivotally connected to the axis of the chain sprocket 23. The axis of the sprocket 23 is mounted in the slots of the outer bracket 20 in a movable manner. The chain is tensioned by screwing the nut 22 onto the grub screw 21, passed through a hole in the end surface of the outer bracket 20.

In order to apply a defect location, the installation is equipped with a defect marker 24, which is a spray gun consisting of a forming nozzle 25, a cylindrical cup 26 for paint installed on the same axis as the forming nozzle, and a locking needle 27 that covers the inlet openings glass 26. The position of the locking needle 27 relative to the outlet

The cup 26 is regulated by supplying compressed air through a pneumatic actuator of the locking needle. A portion of the compressed air is supplied through the channels 28 to the cavity of the forming nozzle. Have

The end of the locking needle 27 creates a vacuum in the outlet of the glass, whereby paint from the glass is fed into the forming nozzle. The internal cavity of the forming nozzle, made in the form

hyperboloid of rotation, forms the direction of flow of air-paint mixture to the product in the form of a thin strip.

The device works as follows.

Moving the trolley 1, the unit is positioned above the controlled weld. Then, an X-ray source 7 and an introscope 8 connected to a television screen are included.

With simultaneous movement of the X-ray unit 7 and the introscopes 8 along the seam on the screen, an image of the translucent seam appears. If necessary, note the defect operator includes a paint marker

24 defects, applied to the product line, corresponding to the size of the defect.

The use of the unit for mechanized X-ray television control allows to increase productivity.

labor at the control of tanks with a capacity of up to 20,000 m3 10-20 times. When welding larger tanks and isothermal tanks (with 100% control), the control performance increases by 50

time.

In addition, the working conditions of the flaw detectors are improved.

Claims (1)

Invention Formula A device for X-ray inspection of welds of metal structures, containing support-mounted for the product mounted on the base and mounted on the longitudinal guides of a trolley and an x-ray machine, which is movable from the drive, is different. that, in order to increase the productivity in the control of sheet panels for rolled reservoirs, the device is equipped with an X-ray receiver — an introscope, the trolley is equipped with additional guides arranged perpendicular to the longitudinal guides, additional guides made in the form of beams, on each of which a platform is movable from the drive, while the X-ray unit is located on one of the platforms, the introscope is placed on the other. Image quality in the process of control Image is stable, without visible interference, sharp Image jumps, doubles, sharpness is insufficient Type A Fig.Z Bb Fig.C 25 -26 I / I Phage. five