Evaluation of dissimilar friction stir lap joints using digital X-ray radiography

Autor:	K. Arunmuthu, B. P. C. Rao, Tapan Kumar Pal, Hrishikesh Das, T. Saravanan, T. Jayakumar, John Philip
Rok vydání:	2013
Předmět:	Plunger Materials science Acoustics Metallurgy Rotational speed Welding Condensed Matter Physics law.invention Lap joint law Image noise Friction stir welding General Materials Science Sensitivity (control systems) Penetration depth
Zdroj:	Science and Technology of Welding and Joining. 19:125-132
ISSN:	1743-2936 1362-1718
DOI:	10.1179/1362171813y.0000000172
Popis:	A digital X-ray radiography methodology is proposed for quality assessment of aluminium–zinc coated steel dissimilar lap joints produced by a friction stir welding process. This methodology uses digital frame integration for acquisition of data to reduce the image noise followed by high pass filtering to sharpen the image by gradient operation and contrast adjustments to detect micro defects in FSW joints. The effect of welding parameters such as rotational and travel speed of weld tool and penetration depth on quality of the weld is studied. The new methodology has resulted in three-fold increase in signal-to-noise ratio (SNR) with improved defect detection sensitivity. The present study clearly shows that the weld tool rotational speed, travel speed and plunger depth have a decisive role on the quality of the weld obtained by the friction stir welding process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::97e7a7b52d961d01cc14793ed8b3d80b https://doi.org/10.1179/1362171813y.0000000172 Zobrazit plný text záznamu