Manufacturing method for spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorsTomoyuki Tanaka, Kouji Okazaki
Life of this patent
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Abstract
A method of manufacturing a spark plug includes a joining step of joining a first member and a second member which constitute the spark plug. In the joining step, a first welding electrode in contact with the first member and a second welding electrode which has an elastically deformable intermediate portion and which is in contact with the second member are electrically connected through the first member and the second member, whereby the first member and the second member are joined together by resistance welding.
Claims17
A method of manufacturing a spark plug which includes a center electrode, a metallic shell, and a ground electrode having one end portion joined to a forward end portion of the metallic shell, the method comprising:
- a joining step of joining a first member and a second member which constitute the spark plug,
- wherein, in the joining step, a first welding electrode in contact with the first member and a second welding electrode which has an elastically deformable intermediate portion and which is in contact with the second member are electrically connected through the first member and the second member, whereby the first member and the second member are joined together by resistance welding,
- a step of acquiring, from positional information of the second member, a correction value for rendering constant a load applied for the resistance welding;
- and
- a step of adjusting the load applied for the resistance welding by use of the correction value.
(canceled)
Dependencies are inferred from the claim text.