Vision-Based Defect Detection in Laser Metal Deposition Process
Laser metal deposition (LMD) is a type of additive manufacturing process in which the laser is used to create a melt pool on a substrate to which metal powder is added. The powder is melted within the melt pool and solidified to form a deposited track. These deposited tracks may contain porosities or cracks which affect the functionality of the part. When these defects go undetected, they may cause failure of the part or below par performance in their applications. An on demand vision system is required to detect defects in the track as and when they are formed. This is especially crucial in LMD applications as the part being repaired is typically expensive. Using a defect detection system, it is possible to complete the LMD process in one run, thus minimizing cost. The purpose of this paper is to summarize the research on a low-cost vision system to study the deposition process and detect any thermal abnormalities which might signify the presence of a defect.
S. Barua et al., "Vision-Based Defect Detection in Laser Metal Deposition Process," Rapid Prototyping Journal, Emerald, Jan 2014.
The definitive version is available at http://dx.doi.org/10.1108/RPJ-04-2012-0036
Mechanical and Aerospace Engineering
Materials Science and Engineering
Keywords and Phrases
Laser Metal Deposition; Layered Manufacturing; Vision Sensor
Article - Journal
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