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It was a science first conjured amid the fiery ovens of ancient blacksmiths; today more than 50% of all U.S. products require some form of welding. Whether via electricity, flammable gases, sonic waves, or sometimes just raw explosive power, welding creates powerful bonds between metal unmatched by any other joining process . From high atop emerging 60-story towers on the Las Vegas strip to oil platforms hundreds of feet below the ocean, discover how welders forge the backbone of civilization. Learn about exciting new applications: how sound waves create bulletproof welds for contemporary body armor; the technologies behind robotic welding systems; and the knee-rattling impact of an explosion weld, the most powerful method of all.