The piping connector 1, wherein the inner periphery of the socket is provided with a first diameter contracted portion and a second diameter contracted portion, and {HEAD ~ a stepped portion} for constituting a stopper and {TAIL ~ a burr stopper} in welding the hold ring is formed between the first diameter contracted portion and the second diameter contracted portion 
for constituting
The piping connector 1 , wherein the inner periphery of the socket is provided with a first diameter contracted portion and a second diameter contracted portion , and { HEAD ~ a stepped portion } for constituting a stopper and { TAIL ~ a burr stopper } in welding the hold ring is formed between the first diameter contracted portion and the second diameter contracted portion
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