Method And System For Producing Contact Member Being Employed In Electric/Electronic Circuit

A method for producing a contact member being employed in electric/electronic circuits comprising a first process and a second process, said first process comprising steps of:

• supplying a spring base strip;
• supplying a noble metal wire;
• welding and combining said noble metal wire with said spring base strip by a seam welding utilizing upper/lower rotating electrodes as holding supplied said folded spring base strip and noble metal wire between said upper and lower rotating electrodes;
• and
• winding a welded and combined product produced by said seam welding, and said second process comprising a step of:
• punching said welded and combined 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;
• and
• a testing step, which determines a preciseness of a welded position and a strength of a welded portion by a rupture test, is performed between said seam welding step and said winding step, wherein:
• the testing step comprises sub-steps of:
• sampling specimens having predetermined dimensions at the beginning of a production lot;
• determining the preciseness of the welded position and the strength of the welded portion by the rupture test;
• confirming the determined values fulfill predetermined standards;
• starting the production lot;
• sampling specimens having the predetermined dimensions at the end of the same production lot;
• determining the preciseness of the welded position and the strength of the welded portion by the rupture test machine;
• and confirming the determined values fulfill predetermined standards again.