Yup, I work as a shipwright welder and have had to refuse to complete assigned tasks. When I'm tasked with welding two large steel plates together, end to end, they both need to be double beveled. If they're not, then all I can do is make thin surface welds which are easily broken.
That's dangerous as these steel plates are an inch and a half thick and weigh a lot. Their weight alone will break surface welds. So I refuse to do the job. They ask why I refuse and I tell them about the lack of double bevel.
I'm even willing to break out the oxy/acetalyne torch and cut the bevels myself, but they refuse. They're in a hurry, they don't have time to do things correctly or safely, and they don't care about making it someone elses problem. That's the sort of shit that's likely to cause serious injury or death.