I always disconnect the battery when I weld on a car. And it comes out if it there is any safety concern. I do most of my welding outside as an added precaution. Bob
That's one of those bite-you-in-the-rear statements, they'll get you every time. I once told a girlfriend "I've never dumped a motorcycle in my life" and a few seconds later I learned I should have kept my mouth shut. It's funny now, wasn't then. I've blown a battery up, 56 Ford with a hole in the crossover pipe pointed right at the battery.
A friend that didn't know was charging a battery with the caps on and he stood with his back to it, had a cigarette in his hand too when it went BOOM!!! He got acid all down his back and legs. It melted his jacket and jeans and skin. We fell about the place laughing but was serious. Glad no one was hurt and lesson learned.