JP2011005536A - System for detecting root groove-width - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for inexpensively and easily determining a root groove-width in welding.SOLUTION: The problem is solved by a system for detecting root groove-width, which comprises: a machine for inserting a welding wire into a groove to be welded; and a machine for detecting the positions of both side edges of the groove by shaking the welding wire in the groove-width direction in a state of halting a welding machine or a member to be welded.

Description

  The present invention relates to a groove width detection system when welding a welded structure.

  As a method for measuring the welding groove, a welding rail is provided on one of the base metals to be welded in parallel with the groove, and the welding machine is run, and the groove center position and groove width are detected in front of the welding torch. A detector is known that is suspended (Patent Document 1). In this detector, contacts are provided at both ends of the rotating arm, and a potentiometer is provided on the rotating shaft of the rotating arm so as to obtain the deviation amount and groove width of the groove center line from the detected rotation angle. Have

  There is also a method in which two laser sensors are provided at the tip of the traveling welder and the groove width and groove center displacement amount are detected by detecting both sides of the groove by swinging in the direction transverse to the groove. Known (Patent Document 2).

Japanese Patent Laid-Open No. 7-116846 JP 2001-179446 A

  Conventional means for detecting the groove shape requires a laser sensor and a dedicated device, which not only costs them but also makes the welding device itself excessive. In the case of a laser sensor, if the groove surface is ground with a grinder or the like, measurement may be impossible due to the gloss.

  The present invention provides a bottom groove width detection system that solves the above-mentioned problems, and achieves this object by measuring the bottom groove width by swinging the welding wire itself within the groove. It is.

  That is, the present invention relates to a machine in which a welding wire is inserted into a groove to be welded, and the welding wire is swung in the groove width direction while the welding machine or a member to be welded is stopped. The present invention relates to a bottom groove width detection system including a machine for detecting the positions of both side edges of the bottom edge.

  According to the present invention, the bottom groove width can be easily detected by an inexpensive means, the welding conditions can be set, and good welding quality can always be ensured.

It is the figure which demonstrated typically the method to rock | fluctuate a welding torch by this invention and to detect a bottom part groove width. It is the schematic which shows the state which attached the rocking | fluctuation device of the welding torch to the welding machine.

The welding machine used in the present invention may be a commercially available one and usually has a running function, but the welding machine may be of a fixed type that travels the member to be welded.
FIG. 1 shows a schematic diagram for detecting the bottom groove width by swinging the welding torch, and FIG. 2 shows a welding machine equipped with a swinging device for the welding torch.

  The means for swinging the welding wire is not limited, but it is preferable to attach the swing mechanism to the welding torch. As this swing mechanism, a mechanism capable of adjusting the swing speed and swing width is used. Examples of the swing mechanism include a swing mechanism that swings left and right and a swing mechanism that moves back and forth.

  In FIG. 2, reference numeral 20 denotes a circumferential guide rail mounted on the pipe 10 that is abutted, and 21 denotes a welding machine that automatically performs welding installed on the circumferential guide rail 20. The welding machine 21 travels on the outer peripheral surface of the pipe 10 while being guided by the circumferential guide rail 20, a slide X axis 23 provided on the traveling device 22 and slidable in the groove width direction, and a slide A slide Y-axis 24 connected to the X-axis 23 and slidable in the torch height direction, a torch support 25 attached to the slide Y-axis 24 so as to be swingable in the pipe circumferential direction, and rotatable to the torch support 25 And a wire feeding device 27 provided on the traveling device 22. The traveling device 22 of the welding machine 21 is provided at the lower portion of the traveling carriage 221 and the traveling carriage 221, and is provided at the lower portion of the traveling carriage 221 and the traveling wheels 222 that mesh with the external teeth 202 of the circumferential guide rail 20. A gripping mechanism 223 that grips both ends of the rail 20 and a Z-axis motor 224 with a Z-axis encoder 225 that is provided on the traveling carriage 221 and is driven are configured. Reference numeral 231 denotes an X-direction drive mechanism that drives the slide X-axis 23 in the groove width direction, reference numeral 241 denotes a Y-direction drive mechanism that drives the slide Y-axis 24 in the torch height direction, and reference numeral 251 denotes an angle of the welding torch 26 in the β direction. A β-direction drive mechanism to be adjusted, 261 is a rotary drive welding mechanism inside the welding torch, has an R-axis encoder 263, and has a rotary motor 262. The wire feeding device 27 includes a wire feeding motor 272 that drives a wire feeding mechanism 271 and a wire reel 274. A conduit cable 30 includes a welding wire 31 and a traveling position detector 29 provided on the traveling carriage 22.

  As shown in FIG. 2, the welding torch 26 swings left and right by the X-direction drive mechanism 231 that drives in the groove width direction. The welding wire 31 is attached to the welding torch 26.

As shown in FIG. 1, the groove portion is a portion obtained by tapering the butt surface of the member to be welded, and the bottom groove width is the groove width at the lower end, that is, the root gap width.
When measuring the bottom groove width, a welding wire is inserted into the groove to be welded in a state where the welding machine is stopped, and the welding wire is swung in the groove width direction.
The rocking speed is about 5 mm / s to 25 mm / s, preferably about 10 mm / s to 20 mm / s.

  The bottom groove width is obtained by moving the torch left and right while oscillating the welding wire left and right at the end of the welded portion and visually measuring the width between the workpieces. However, since visual observation may be impossible depending on the welding position, in this case, measurement can be performed using a welding monitoring camera (arc monitoring camera).

  Further, based on the obtained bottom groove width, it is possible to set the welding conditions such as the swing width and the welding speed. For example, when the reference value of the bottom groove width is 5 mm and the actually measured bottom groove width value is 5.5 mm, the swinging width increases by 0.5 mm. When the bottom groove width exceeds the reference value, it is necessary to increase the welding amount by the amount exceeding the reference value, and as a result, the welding speed must be reduced. On the other hand, when the bottom groove width is less than the reference value, it is necessary to reduce the welding amount by the shortage, and as a result, the welding speed must be increased.

  According to the present invention, the welding groove width can be easily measured and the welding conditions can be set, so that it can be widely used for welding.

DESCRIPTION OF SYMBOLS 10 Pipe 20 Circumferential guide rail 21 Welding machine 22 Traveling apparatus 23 Slide X axis 24 Slide Y axis 25 Torch support body 26 Welding torch 27 Wire feeder 30 Conduit cable 31 Welding wire 224 Z axis motor 231 X direction drive mechanism 232 X Axis motor 241 Y-direction drive mechanism 242 Y-axis motor 251 β-direction drive mechanism 252 β-axis motor 261 Rotation drive mechanism 262 Rotation motor 272 Wire feed motor

Claims (1)

  With the welding wire inserted into the groove to be welded and the welding machine or the member to be welded stopped, the welding wire is swung in the groove width direction so that the positions of both side ends of the groove are set. Bottom groove width detection system comprising a detecting machine

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