Welding inspection method and apparatus thereof

A technology for welding inspection and equipment, which is applied in welding equipment, metal processing equipment, processing detection response signals, etc., and can solve problems such as failure to provide reference signals

Active Publication Date: 2012-01-18
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a configuration where two probes straddle both sides of the weld, or for an object whose bottom is not smooth, the bottom echo intensity itself is used as a parameter, so it cannot serve as a reference signal

Method used

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  • Welding inspection method and apparatus thereof
  • Welding inspection method and apparatus thereof
  • Welding inspection method and apparatus thereof

Examples

Experimental program
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Effect test

no. 1 example

[0044] figure 1 Shown is a schematic block diagram of the configuration of the welding inspection apparatus according to the first embodiment of the present invention. figure 2 Shown is a cross-sectional view of paths of emitted laser light, received laser light, scattered / reflected laser light, and excited ultrasonic waves in the welding inspection method according to the first embodiment of the present invention. image 3 A sectional view for explaining the functions of the distance measuring mechanism and the focus control mechanism in the out-of-focus state in the welding inspection method according to the first embodiment of the present invention. Figure 4 A sectional view for explaining the functions of the distance measuring mechanism and the focus control mechanism in the in-focus state in the welding inspection method according to the first embodiment of the present invention.

[0045] The welding inspection device according to the present embodiment includes: an e...

no. 2 example

[0067] Image 6 Shown is a schematic block diagram of a configuration of a welding inspection apparatus according to a second embodiment of the present invention. Figure 7 Shown is a cross-sectional view of paths of emitted laser light, received laser light, scattered / reflected laser light, and excited ultrasonic waves in a welding inspection method according to a second embodiment of the present invention.

[0068] In this embodiment, the receiving laser light Id is irradiated to the groove side surface. In this case, the incident ultrasonic wave Ui directly enters the defect D directly below the incident point, and the reflected ultrasonic wave Ur from the defect D propagates within the object 4 to be inspected as a bulk wave such as a longitudinal wave or a transverse wave. The surface wave component whose mode has been converted at the groove portion is irradiated on the receiving laser light Id on the groove side surface for reception. This enables defect inspection of...

no. 3 example

[0072] Figure 8 Shown is a schematic block diagram of a configuration of a welding inspection apparatus according to a third embodiment of the present invention. In this embodiment, the positional relationship between the emitting laser irradiation point Pi and the receiving laser irradiation point Pd in ​​the first embodiment is reversed so that the receiving laser irradiation point Pd is on the surface of the welded metal part W of the object 4 to be inspected. superior. Other than that, other configurations are the same as those of the first embodiment. Even if the positions of the emitting laser irradiation point Pi and the receiving laser irradiation point Pd are reversed, the systematic effect can be obtained.

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Abstract

A welding inspection method has steps of: generating transmission laser light for generating an ultrasonic wave and transmitting the transmission laser light to an object to be inspected during or after welding operation for irradiation; generating reception laser light for detecting an ultrasonic wave and transmitting the reception laser light to the object to be inspected for irradiation; collecting laser light scattered and reflected at surface of the object to be inspected; performing interference measurement of the laser light and obtaining an ultrasonic signal; and analyzing the ultrasonic signal obtained by the interference measurement. At least one of the transmission laser light generated in the transmission laser light irradiation step and the reception laser light generated in the reception laser light irradiation step is irradiated onto a welded metal part or a groove side surface.

Description

technical field [0001] The invention relates to a welding inspection method and equipment using laser ultrasonic technology. Background technique [0002] Welding is an indispensable technique for structural fabrication, and with the advancement of technology in recent years, it has become possible to weld objects made of materials that have traditionally been difficult to weld or objects that have shapes that have traditionally been difficult to weld. Meanwhile, it is often the case that the inspection itself is difficult because structures made using advanced welding techniques often have special groove shapes or complex surface shapes. In this context, the importance of inspection techniques to ensure the reliability of welded structures is increasing day by day. [0003] As described above, when performing inspections to ensure the quality of welded parts for technically difficult welding such as thick plate welding or welding for structures with complex shapes, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCB23K31/125G01N29/2418G01N29/46G01N2291/267
Inventor 山本摄三浦崇广星岳志小川刚史藤田善宏平野正三渡部和美长井敏吉田昌弘浅井知落合诚千星淳
Owner KK TOSHIBA
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