The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2013
Filed:
Apr. 02, 2008
Dae Yeol Ohm, Seoul, KR;
Seok Ki Song, Daejeon, KR;
Hyun Joong Kim, Cheongju, KR;
Byung Heon Shin, Gwangju, KR;
Young Tae Yoo, Gwangju, KR;
Dae Yeol Ohm, Seoul, KR;
Seok Ki Song, Daejeon, KR;
Hyun Joong Kim, Cheongju, KR;
Byung Heon Shin, Gwangju, KR;
Young Tae Yoo, Gwangju, KR;
Yura Tech Co., Ltd., , KR;
Abstract
A method of welding a noble metal tip of a spark plug to an electrode is provided. In the method of welding, in a waveform of a power of a laser beam according to a time of the laser welding, a power of a central portion thereof is smaller than those of both end portions thereof. In addition, the waveform of the power of the laser beam according to a time of the laser welding is a trapezoidal waveform which includes: a rising portion in which the power of the laser beam is gradually increased; a power maintaining portion in which the power of the laser beam after the rising portion is maintained uniform; and a falling portion in which the power of the laser beam after the power maintaining portion is gradually decreased. In addition, the waveform of the power of the laser beam according to a time of the laser welding is a triangular waveform which includes: a rising portion in which the power of the laser beam is gradually increased; and a falling portion in which the power of the laser beam after the rising portion is gradually decreased. Accordingly, it is possible to securely attach the electrode tip to a central electrode or a ground electrode.