Patent ID: 8552331

Claim:
A method for producing a contact member being employed in electric/electronic circuits comprising steps of: supplying a spring base strip; supplying a noble metal wire; welding said noble metal wire to said spring base strip by a seam welding utilizing upper and lower rotating electrodes as holding said spring base strip and noble metal wire between said upper and lower electrodes; and winding a welded product, wherein: said seam welding step comprises a step of setting welding conditions and a step of circulating chilled water in a closed channel with cooling water flowing through a through-hole of an upper housing of said upper rotating electrode and a through-hole perforated through a cooling shaft arranged as a rotating axis of said lower rotating electrode the method further comprising steps of: sampling specimens from said welded product at the beginning of a production lot and at the end of the same production lot; testing said specimens for determining a preciseness of a welded position of said noble metal wire to said spring base strip and a strength to peel said noble metal wire from said spring base strip by a test machine by a hooking device arranged perpendicular to an axis of said noble metal wire and contacting a side of the noble metal wire, and moving said hooking device away from the specimen in a direction parallel to the surface of the spring base strip; and confirming the values determined by said testing step fulfill predetermined standards.