Repaired one like that once...really.
Polish fella at work brought me his non drive crank...with the sheared off axle still attached. Despite my reservations, warnings and reluctance, he begged me to repair it till he could afford to replace it.
Ground chamfers into each mating surface, welded and sanded back to a tight fit...and gave it back with the sternest warning about its probable life expectancy (and his if he did anything other than pootle on it till he got it fixed).
Knowing the majority of immigrant workers I've worked with, its probably still on the bike.