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Paper Abstract and Keywords
Presentation 2021-07-02 13:55
Comparison of discharge circuits for magnetic pulse welding using 1, 5 and 10 turn flat coils
Aizawa Tomokatsu (Tokyo Metropolitan College) EMD2021-1
Abstract (in Japanese) (See Japanese page) 
(in English) The discharge circuits for magnetic pulse welding of sheet metals using 1, 5 and 10 turn flat coils will have tens of times greater differences in capacitance (electric capacity), circuit inductance and circuit resistance during discharge. We compare the discharge circuits when the oscillation period of the damped oscillating discharge current is almost the same. Welding is performed by rapidly flowing the discharge current from each capacitor to each coil. Al/Cu sheets are overlapped with a gap, are fixed on each insulated coil. The Al sheet near the coil is electromagnetically coupled to the coil. When the current flows through the coil, the generated high-density magnetic flux is suddenly applied to the Al sheet. The resulting eddy currents are induced in the Al sheet and electromagnetic forces act on it. The Al sheet collides to the Cu sheet at high speed and both sheets are welded. In order to weld both sheets efficiently, the sheets are collided near the discharge current peak. We obtain and compare each inductance, resistance, logarithmic decrement, etc. from discharge circuit analysis and discharge current waveforms. This can support efficient magnetic pulse welding using the new 10 turn coil.
Keyword (in Japanese) (See Japanese page) 
(in English) Electrical connection / Magnetic pulse welding / Al sheet / Cu sheet / Discharge circuit / Circuit analysis / Flat coil /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 85, EMD2021-1, pp. 1-6, July 2021.
Paper # EMD2021-1 
Date of Issue 2021-06-25 (EMD) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EMCJ EMD WPT  
Conference Date 2021-07-02 - 2021-07-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMD 
Conference Code 2021-07-EMCJ-EMD-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of discharge circuits for magnetic pulse welding using 1, 5 and 10 turn flat coils 
Sub Title (in English)  
Keyword(1) Electrical connection  
Keyword(2) Magnetic pulse welding  
Keyword(3) Al sheet  
Keyword(4) Cu sheet  
Keyword(5) Discharge circuit  
Keyword(6) Circuit analysis  
Keyword(7) Flat coil  
1st Author's Name Aizawa Tomokatsu  
1st Author's Affiliation Tokyo Metropolitan College of Technology (Tokyo Metropolitan College)
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Speaker Author-1 
Date Time 2021-07-02 13:55:00 
Presentation Time 25 minutes 
Registration for EMD 
Paper # EMD2021-1 
Volume (vol) vol.121 
Number (no) no.85 
Page pp.1-6 
Date of Issue 2021-06-25 (EMD) 

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