Non-destructive Inspection of Magnesium Alloy Stud Welding by Vibration Analysis
Stud welding plays a key role in making electronic device cases using magnesium alloy sheets. The welding of magnesium is a rather difficult process because of its high thermal conductivity and easy oxidizability. When magnesium alloy sheets are thin, boss forming becomes more difficult. Therefore a...
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Veröffentlicht in: | Hi-hakai kensa 2010/01/01, Vol.59(1), pp.33-37 |
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Format: | Artikel |
Sprache: | eng ; jpn |
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Zusammenfassung: | Stud welding plays a key role in making electronic device cases using magnesium alloy sheets. The welding of magnesium is a rather difficult process because of its high thermal conductivity and easy oxidizability. When magnesium alloy sheets are thin, boss forming becomes more difficult. Therefore an effective method for the non-destructive testing of magnesium stud welding is desired to perform a 100-percent inspection. We propose a new method, in which a stud is excited electromagnetically and the vibration of the stud head is measured by a laser velocimeter. We applied this method to two groups of magnesium alloy stud specimens, one welded with the optimum energy and the other welded with insufficient energy. The cross-sectional area of those weldings was evaluated by X-Ray CT. A difference appeared in the amplitude spectrum of the displacement at the stud heads. We introduced a parameter K which is the average amplitude between zero and 70 kHz in the amplitude spectrum. The two welding groups can be distinguished with an accuracy of 90% by using the parameter K. |
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ISSN: | 0367-5866 |
DOI: | 10.11396/jjsndi.59.33 |