Detection of slag inclusions in MMA joints with passive thermography techniques
Wojciech Jamrozik 1  
,   Jacek Górka 1  
,   Marta Kiel-Jamrozik 1  
 
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Politechnika Śląska
CORRESPONDING AUTHOR
Wojciech Jamrozik   

Politechnika Śląska
Submission date: 2020-02-25
Final revision date: 2020-05-25
Acceptance date: 2020-05-26
Online publication date: 2020-05-27
Publication date: 2020-05-27
 
Diagnostyka 2020;21(2):111–117
 
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ABSTRACT
Arc welding with coated electrode, called also manual metal arc welding (MMAW) is one of the most popular welding methods. One of the disadvantages of this method is the formation of slag inclusions caused by improper removal of slag from the previously made weld, too little heat supplied to the joint or too little gap in the height of the ridge. Such inclusions significantly reduce the mechanical properties of the joint, eliminating them already at the manufacturing stage is important from the point of view of ensuring the quality of the products. A method of detecting solid inclusions in the weld using infrared monitoring has been proposed. Thermograms were subjected to Fourier 2D transformation. For the two-dimensional spectra (F-images) images obtained in this way, point features describing the weld condition in a given measuring window were determined. The results of the analyses plotted as a function of the electrode path allowed for their comparison with X-rays and selection of F-image features, the best in terms of detection of slag inclusions in welds.
 
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