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Detection of the weak magnetic properties change of stainless-steel welding parts by low frequency magnetic imaging

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5 Author(s)
Hayashi, Takayuki ; Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8350, Japan and Pulstec Industrial Co., Ltd., 7000-35 Techno-Land, Hosoe, Kita-ku, Hamamatsu, Shizuoka 431-1304, Japan ; Yamada, Hironobu ; Kiwa, T. ; Tsukada, Keiji
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Differences in weld quality resulting from variations in welding conditions were detected via low frequency magnetic imaging. This magnetic imaging was obtained using a recently developed measurement system, consisting of an exposure coil, a magnetoresistive (MR) sensor, and a lock-in amplifier. A wide area of stainless-steel sample was exposed to the magnetic field via an induction coil, and the MR sensor measured the generated magnetic field from the sample. The frequency of the magnetic field ranged from 20 Hz to 1 kHz. A cylindrical stainless-steel sample was fabricated by rolling a stainless-steel sheet and welding each edge by an arc welder with argon gas, while the welding condition was changed by controlling the argon gas flow. The magnitude and phase shift of the generated magnetic field from the sample was measured by scanning the MR sensor on the sample surface. The change in magnetic properties caused by the welding condition change was successfully imaged.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 7 )

Date of Publication:

Apr 2008

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