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 {HEAD ~ the socket} by ultrasonic welding 
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 { HEAD ~ the socket } by ultrasonic welding
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 TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH