{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 {TAIL ~ the inner periphery} of the socket by ultrasonic welding 
is welded to
{ 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 { TAIL ~ the inner periphery } of 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 REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH