worker prepares a cad-welding crucible


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Worker prepares a cad-welding crucible.­ The crucible was filled with the copper oxide and aluminium powder mix for the thermite bonding, as well as magnesium powder to initiate the exothermic reaction.­

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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