Like Bob said, arcing and welding because of the low voltage/high amperage caused from a discharged battery.
Another thing that happens, on the Delco type starters with the solenoid on top that pulls in the starter drive... The spiral on the shaft that the drive slides on, if the thrust bushing is worn, broken and gone, lets the drive spiral further out on the shaft than it should. That causes the fork that pulls the drive into the flywheel, to move further than it should, resulting in the plunger being pushed into the solenoid by the starter torque, transferred through the spiral on the shaft, which holds the contacts in the solenoid closed.
With a good battery, the engine is turned through the compression stroke, then the engine turns itself as the compression rebounds, or it starts. When the load is relieved on the starter, the plunger moves out slightly and opens the contacts if the start signal had been removed.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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