Flight Instructor with student reported nose gear failure during landing. The flight crew secured the aircraft and noticed the nose gear had broken at a weld point and was completely severed from the airframe.

Narrative

I was the Pilot In Command conducting a flight review for a club member who had let his last one lapse. I was landing current and qualified to be giving flight instruction. On the student's last landing the nose gear departed the aircraft on the landing roll out. None of the student's landings were even what I could call firm all day. His last landing was on center line with no lateral moment applied to the landing gear. His touch down was smooth and he gently let the nose gear come to rest on the runway. I said 'Nice!' and shortly after that (approximately a half second); I heard a loud bang and saw that the propeller had stopped spinning and that we were sliding down the runway in an unusually low nose attitude. After we came to a stop I assessed that we did not have a fire but elected to turn the fuel selector off. I made sure he was not injured and then radioed the FBO to close the runway. Once they confirmed that they were sending someone out the student continued to shut off the electronics and we egresses the aircraft. Upon exiting the aircraft I noticed that the nose landing gear was approximately 800 feet down the runway behind us. It appeared that it broke off near a weld on the support structure. After looking in the FAR/AIM I decided that it was not a reportable incident but I wanted to file a report anyway. I do not think there was anything that could have been done to prevent this; just a freak occurrence.