workers ignite cad-weld powder in a crucible

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Workers ignite cad-Weld powder in a crucible.­

For more information about cad-welding (i.­e.­ exothermic welding), read en.­wikipedia.­org/­wiki/­Exothermic_­welding.

View more photos of railroad workers replacing a Muni lightrail track section on Church street in San Francisco.

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Industrial Photography Muni Railroad Track Construction (San Francisco)
190 Church St, San Francisco, CA 94114, USA