I had this happen in welding school.I was learning how to weld vertical up, I was using E7018, on a 1/4" thick plate. I was sitting on top of the welder that was for the booth next to mine. I had my leg under the bottom edge of the plate and was welding away. I was not moving the rod fast enough and a huge blob of molten steel feel out of the puddle and burned a hole clear though my boots on the outside of my left foot near my ankle bone. I watched the ball of steel drop and hit my boot, I thew my hood off and was hopping around like nobody's business, yelling and screaming. I have a scare that is 1/8" deep x 1/4" wide and 1" long. The boots had a hole in them and I had to go and get another pair to wear for the day. These were the boots that they had issued us, I use only boots that I had purchased from there on out. ( I went to ClearField Job Corps Center, Clearfield UT, for welding school.)