New product announcements: 06/02/2010 Welding Power Source: Versatile The Flextec 450 multiprocess welding power source can deliver up to 500 amps of power and has updated inverter technology, which provides faster arc response, lower power consumption and lower overall weight. The machine’s multiprocess capability includes stick, Touch Start DC TIG, MIG and flux-cored welding, as well as arc gouging up to 3⁄8-in. carbon. The Flextec 450 has a rugged case and can withstand rough environments. Variable arc force allows for use with different materials and a hot start for work on thin materials. Lincoln Electric; 888-355-3213; www.lincolnelectric.com Preserve Hearing: Noise-Level
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.