{HEAD ~ The hold ring} includes a groove in a ring like shape for constituting a burr storing space at an outer periphery thereof and is welded to the inner periphery of {TAIL ~ the socket} by ultrasonic welding 
{ HEAD ~ The hold ring } includes a groove in a ring like shape for constituting a burr storing space at an outer periphery thereof and is welded to the inner periphery of { TAIL ~ the socket } by ultrasonic welding
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH