Joe,
That seems to be a common request. It makes sense to the user. However, NEC Article 630 (Electric Welders) would not permit such an installation.
Your local electrical inspector may choose to waive the code article and permit you to install as "convenience" outlets as you describe. I would have no problem with that.
Your local inspector may not permit such an installation and justify it with the following reasoning: The owner of the garage may sell his business one day. The new owner may operate several welders at one time not knowing they are fed from one 50 amp circuit breaker.
Frank
