This document describes a steel plate weld zone inspection system using laser metrology. It evaluates sample articles to inspect the state of welding connections. Measurements were taken of a steel sample's weld zone using a laser metrology camera, telecentric lens, and blue laser light. The results graphs show the depth of welding, with blue indicating larger changes and orange smaller changes in the weld zone. The system is intended to automatically inspect welding quality and could be integrated into a conveyor line for online inspection.

1. Company
Logo
Steel plate weld zone inspection system
ISC Inc.
http://www.isc-net.co.jp
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2. Company Logo
１．Outline
This system is a system to inspect the junction state of a steel plate
weld zone by laser metrology apparatus.
When judgment can perform the state of a junction by evaluation,
the inspection by laser metrology is preparing a threshold value, and
can perform quality maintenance more than [ a certain ] fixed.
The inspection system of proposal makes the sample article the
subject of examination.
About a real introduction machine, I will consult based on these
data.
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3. Company Logo
２． Measurement evaluation-Ⅰ
As this system examination, the following measurement was performed
with the sample.
2.1 Measurement use equipment
The camera for laser metrology, a tele centric lens, blue laser light, an encoder, a set of
personal computers
2.2 Test measurement mechanism
Laser illuminator
The camera for laser metrology
Encoder
Carrier machine
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PC
LAN
Conveyance
Laser light
sample

4. Company Logo
２． Measurement evaluation-Ⅱ
2.3 An article to be examined
Your company steel-material s weld zone article sample.
2.4 The contents of an inspection
・After se tting a sample to a conveyance stage, while a conveyance stage drives, irradiate with laser
light, and picturize with a laser metrology camer a. The timing of an image pick-up takes in by the
puls e signal and camera from an encoder accompanying a conveying machine synchronizing.
・ the range to be e xamined conveys the range to be examined by a mechanism, where laser light is
inter sec ted in a welding connec tion par t - - as Laser light is set up. - Control of the camera for laser
metrology uses the evaluation software of maker supply, and is taking in of data.
・ Measurement carries out laser metrology of the one welding connection s ample, and is a junction
state of the solvent of a welding conne ction part by evaluation software. The value (depth
information) of the direction of Z is saved at a file..
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Sample
The laser conveyance
direction

5. Company Logo
２． Measurement evaluation-Ⅲ
2.5 Measuring result
The measuring result is as follows. The following screen shows the depth (the degree
of welding) of welding of the graph displ ayed under the picture by the display af ter laser
metrology in the sample. Two screens show the degree of welding of another position on a
sample (depth) in the graph.
The blue of the above-mentioned graph shows the form (change of a weld zone is large)
on the white line of a picture. The above-mentioned orange shows the form (weld zone
change is small) on the white line of a picture, and the difference of change of a weld
zone understands it in the blue of a graph, and an orange circle portion.
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6. Company Logo
２． Measurement evaluation-Ⅳ
Change of the weld zone of a front page indicated the large portion.
A graph is a portion with the large amount of change (blue) which shows the amount of change of
the white line (laser scanning par t) on a picture. A round mark is in the state of the we ld zone
depth. In actual processing, coded data is r ec eived from a camera, and it is me asurement form. In
more than a threshold value, NG and judgment of a wel6d zone are possible in the amount of change.

7. Company Logo
２． Measurement evaluation-Ⅴ
Change of the weld zone of a front page indicated the small portion.
A portion (orange round mark) with the small amount of change of a graph is in the state of a
we ld zone. In this case, measured value is below a threshold value. It can judge.
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8. Company Logo
３． About utilization of a laser metrology system
I give the example of a mechanism in the case of using a laser metrology system for below by practical use.
The height information on the laser irradiation portion of parts is obtained for the parts set to the conveyance stage
(conveyance conveyor) as shown in a figure by stage movement.
A conveyance stage changes a size with the size of parts. This mechanism needs mechanism examination for carrying
in and taking out of parts separately according to the flow on employment because of off-line.
Laser camera
Laser light
Inspection
department
article
Conveyance conveyor
(Inspection stage)
Examining
table The example of a laser inspection
system. 8

9. Company Logo
４． Laser system basic configuration
Basic configuration
4.1 Camera For Laser Metrology The multi-camera corresponding to
laser
4.2 Lens I change by the image pick-up range. ?
4.3 laser apparatus Projection distance: 50 ～ 200 ㎜ , line width:
20 ～ 25 μm
4.4 Controller for Control I customize according to employment.
4.5 Laser Metrology Software According to employment, I customize
inspection processing.
4.6 Verifier According to employment, I change a verifier.
• I indicate the spec. of the camera used as a present condition object,
and laser apparatus in the 5th clause.
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10. Company Logo
５． Apparatus spec. table
5.1 Laser Metrology Camera
- The resolution of 2 million pixels / full frame maximum 358 profiles / second
- - The pixel size of 5.5x5.5 micrometers, and resolution (HxV pixel)
The minimum resolution of 2048x1088 and the height direction: 35
micrometers
per pixel 50 micrometer, and global shutter CMOS
- - 3D data arithmetic processing function
- - 2 l aser simultaneous luminosity detection function
- - Power consumption (W) Six or less - a size (WxHxD ㎜ ) 55x55x51.5
5.2 Laser Apparatus - Projection distance 50 Ｘ 200
- - Pattern size Line length 50mm/WD50 The line width of 20 micrometers or less
(blue laser), 25 micrometers or less (red laser)
- - Optical power 5 mW or more of exit wounds CLASS2 and the degree of
luminosity uniform Less than ±10%
- - Oscillation wavelength 406 nm or 660 nm
- - Power supply voltage and current DC12V 50 / 80 mA
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