Gentlemen,
The term is bullet RESISTANT …
Although, there may be glass in the assembly, because of the potential for secondary fragments due to spalling, it’s usually not glass … IE: A glass facing on drive-up teller windows so “customers” have a more difficult time scratching the Lexan or whatever polymer is the current rage.
I have previously installed bullet resistant “windows” that were rated for handgun projectiles but NOT rifle projectiles.
I have also installed panels that would stop "normal" rifle rounds but NOT "armor piercing" rounds. (Nor would it stop a “normal” .50 cal BMG round.)
It’s all a matter of degree.
“I’m a certified welder” – Really, which process? What position(s)?
Cheers,
Jb
PS
“Bullet-proof vests” are rated the same way.