[MinnesotaDave]

I've had to re-type this post 3 times in order to not sound like a dick.

Bad idea. Find another option.

+1

I see no good coming from this.

Welders need a lot of power - in other words, need to be the only item on the circuit.

There is very little chance this bulb is on it's own circuit.

 

[MinnesotaDave]

The lack of ground isn't your biggest issue here. Light sockets usually have a max wattage rating of 600w. This means they are only designed to handle 5 amps flowing through them. If the breaker is rated for 15 amps the socket will be in flames way before the breaker even thinks about tripping. Just say no to light sockets.

An excellent point.