I have had many supportive people around me and I would like to thank them all. This degree work comprises 15 university points and is the last part of the Mechatronics Engineering program, bachelor level. Author: Examiner: Advisor: Programme: Inger Eriksson Anna-Karin Christiansson Jari Repo University West Mechatronics Engineering, Robotics and Embedded Systems, 120 Credits (180 ECTS) Subject: Mechatronics Level: Basic Date: June Report Number: 2008:MR01 Keywords Fillet weld geometry, image processing, laser line projection, scancontrol Publisher: University West, Department of Engineering Science S Trollhättan, SWEDEN Phone: Fax: Web: iģ Preface This thesis work, performed at Production Technology Centre/University West, has been very interesting, educational and a period with joy of discovery. The equipment is important in order to extract data useful for analysis. It is possible to find the geometry of the weld and it is possible to find defects like spatter, undercut and sharp edges, with laser line projection and camera. The data from the scancontrol system was ready to use and it was quite easy to find different defects and discontinuities in the weld area. The laser line projection was too short to cover enough of the weld area and it was hard to process the image to find defects in the weld area. Experiments with the first system ended when it was quite obvious that it did not meet the expected result. Matlab was used to process and analyse data from both systems.

The first system is an in house built system with a laser line diode and a CMOS camera, the other system is scancontrol, and is a device with integrated camera and laser line. Experiments were performed with two different systems to evaluate their capability to capture the weld geometry. One is hand-held and is applied on the weld afterwards and compares the data with pre set parameters. Some of the articles are about existing devices that can measure welds. This report contains a summary of a literature survey for finding means for optical measurements of weld geometry. If the weld is bigger than necessary the cost and the weight grow, and if the weld is undersized the strength is put at risk. 1 2008:MR01 Methods for automatic inspection of weld geometry Inger Eriksson BACHELOR S THESIS Mechatronics Engineering, Robotics and Embedded Systems Department of Engineering ScienceĢ BACHELOR S THESIS Methods for automatic inspection of weld geometry Summary The earlier in the production chain discontinuities in the weld area are discovered the better and less expensive it is to modify the weld.

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