초록 ▼

A method for making a spacer assembly comprises: forming a plurality of projections along an edge of a portion of sheet metal; roll forming the portion of sheet metal into a tubular configuration; positioning the roll formed portion of sheet metal and a metal base member to which the roll formed por

A method for making a spacer assembly comprises: forming a plurality of projections along an edge of a portion of sheet metal; roll forming the portion of sheet metal into a tubular configuration; positioning the roll formed portion of sheet metal and a metal base member to which the roll formed portion of sheet metal is to be welded in a discharge welding apparatus having a pair of electrodes so that the projections of the roll formed portion of sheet metal contact a surface of the metal base member; providing a force so that the projections are disposed in forcible engagement with the surface of the metal base member; and supplying an electrical current between the pair of electrodes and through the roll formed portion of sheet metal and the metal base member so that the projections reach a molten metal stage and are subsequently solidified to enable the roll formed portion of sheet metal to be welded to the metal base member.

대표청구항 ▼

[ What is claimed is:] [1.] A method for making a spacer assembly, comprising:providing a portion of sheet metal having a plurality of projections formed thereon and extending from an edge thereof;roll forming said portion of sheet metal into a tubular configuration with said plurality of projection

[ What is claimed is:] [1.] A method for making a spacer assembly, comprising:providing a portion of sheet metal having a plurality of projections formed thereon and extending from an edge thereof;roll forming said portion of sheet metal into a tubular configuration with said plurality of projections extending from an end of said tubular configuration;positioning said roll formed portion of sheet metal and a metal base member to which said roll formed portion of sheet metal is to be welded in a discharge welding apparatus having a pair of electrodes so that the projections of said roll formed portion of sheet metal contact a surface of said metal base member;providing a force so that the projections are disposed in forcible engagement with the surface of said metal base member; andsupplying an electrical current between the pair of electrodes and through said roll formed portion of sheet metal and said metal base member to enable the projections to reach a molten metal stage and be subsequently solidified so that the roll formed portion of sheet metal is welded to said metal base member;said method characterized in that said plurality of projections are formed on said portion of sheet metal before said portion of sheet metal is roll formed into said tubular configuration.