worker prepares a cad-welding crucible

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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2018 Market Street, San Francisco, CA 94114, USA

Photos of construction workers at work, with their heavy machinery and power tools.­

Road construction, infrastructure, building constructions etc.­

Photos of railroad workers replacing a Muni light rail track section on Duboce street, Church street and Market street (San Francisco).­

Each section of track work, such as replacement of the double diamond crossing structure at Church st and Market st, takes 2 or 3 days with crews working 24h during week-ends.­

The work was realized by local contractor NTK Construction.

I must thank NTK management and crew for letting me shoot those amazing photos on their construction site.­