thermite welding (2 photos)

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workers ignite cad-weld powder in a crucible, cad-welding, exothermic bonding, exothermic welding, high-visibility jacket, high-visibility vest, light rail, men, muni, night, ntk, railroad construction, railroad tracks, railway tracks, reflective jacket, reflective vest, safety helmet, safety vest, san francisco municipal railway, thermite welding, track maintenance, track work, welder, workers, working
workers ignite cad-weld powder in a crucible
worker prepares a cad-welding crucible, cad-welding, exothermic bonding, exothermic welding, high-visibility jacket, high-visibility vest, light rail, man, muni, night, ntk, railroad construction, railroad tracks, railway tracks, reflective jacket, reflective vest, safety helmet, safety vest, san francisco municipal railway, thermite welding, track maintenance, track work, welder, worker, working
worker prepares a cad-welding crucible