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:
Jul. 22, 2003
Filed:
Nov. 15, 2000
Shigeyuki Sakurai, Tsukuba, JP;
Yutaka Takano, Ibaraki-ken, JP;
Naoki Miyanagi, Ibaraki-ken, JP;
Yoshiaki Shimomura, Ohmura, JP;
Hikaru Yamamoto, Ryugasaki, JP;
Toru Takatani, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
In an arc welding method and apparatus, a plasma ( ) is generated at a welding intended position on a base material ( ) by a laser ( ) irradiated to the base material ( ). When a discharge electrode ( ) is at a minus potential, an arc discharge ( ) takes place in the direction of the plasma ( ) and is induced at a position irradiated with the laser ( ). When the electrode ( ) is at a plus potential, arc electrons are generated from a laser irradiated point and discharged to the electrode ( ). When a voltage applied between the electrode ( ) and the base material ( ) is alternating, the polarities of the electrode ( ) and the base material ( ) alternately change so that the foregoing phenomena alternately occur. When the base material ( ) is at a minus potential, an arc discharge ( ) takes place from a laser spot. Also, in regard to the arc discharge ( ), since the plasma ( ) is generated by the laser ( ), a stable arc discharge ( ) can be generated irrespective of the state of the base material ( ) or the state of the electrode ( ).