I use a 2004 Lincoln auto-darkening welding helmet with a Miller Thunderbolt 225 stick welder (230 volts) and with a Hobart 125EZ flux core wire feed welder. The stick welder throws a lot of light when welding, and seeing the joint as I weld is not a problem with it. Seeing the joint as I weld with the wire feed welder has been difficult to impossible. But, I recently made a very helpful discovery.
The photo shows a weld I have started with the wire feed welder. The weld is on 3/16 inch steel. The ends of the pieces have been chamfered for good penetration of the weld. The weld as shown was made by following what I could see in my auto-darkening helmet. You can see that it follows the joint quite nicely.
Step 1: What I had been seeing until recently
Until recently, all I could see of the joint when viewing through my auto-darkening helmet is replicated in the photo with this step. It is the same photo in the previous frame, but manipulated in photo editing software to approximate what I was able to see. The bright blue arc has been created on my computer.