Patent ID: 6792678
Filing Date: 2004-09-21
Classification: B23K,G01N,Y10T

Abstract:
A gas sensor manufacturing method comprising the steps of:preparing an assembly which has a length and includes (a) a housing which has a length made up of a first end portion, a second end portion, and a flange between the first and second end portions, (b) a cover which is made up of a small-diameter portion, a large-diameter portion, and a shoulder formed between the small-diameter portion and the large-diameter portion, (c) a first insulation porcelain disposed in the large-diameter portion of the cover in contact with the shoulder through an elastic member, (d) a second insulation porcelain disposed in the housing in contact of an end thereof with an end of the first insulation porcelain in alignment with each other, and (e) a laminated sensor element disposed in the second insulation porcelain; pressing the cover against the housing in a lengthwise direction of said assembly to fit an end of the large-diameter portion of the cover on the first end portion of the housing to form an overlap; tack welding the large-diameter portion of the cover to the first end portion of the housing at the overlap while pressing the cover against the housing; rotating said assembly about the length thereof; and welding the large-diameter portion of the cover to the first end portion of the housing over the tack-welded overlap.