/diy/ - Do It Yourself

I have pic related. It uses a transformer, it's an AC welder. I want to convert it to DC. I know I need a bridge rectifier and a couple caps but I don't know how to determine what value my caps should be. Open circuit voltage is 27v but I don't know how much that will jump up after rectification(I would assume somewhere around 34v). I imagine something in the 50-60v range would be more than adequate. How would I determine how many mfds to I need to properly smooth out the wave?

As for the bridge rectifier I imagine anything rated for more than 50 volts/150 amps with a spot for a heat sink would work. I watched a video of one guy doing this and he used an inductor in row with the gun, I don't know anything about inductors but would this be a neccesary step/good idea? Everything he did seemed overbuilt but it did work like he wanted.