sentence: A small gray axe with a wooden handle is scraping at a gray substance on the wall. sentence:  Then a very hot torch with flames are melting the gray substance and when it's done it looks flat and scratched up. sentence: A gloved hand turns a white knob on a black and blue machine with red numbers on it that move with each turn, and a colorful animated picture appears. sentence:  The gray substance is shown again being torched and once again shown how it looks afterwards. sentence: A man wearing full protection gear is shown standing and torching the object then it fades to a black screen with white words that say "Hobart Institute of Welding Technology All Rights Reserved".