worker prepares a cad-welding crucible

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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.

cad-welding
exothermic bonding
exothermic welding
high-visibility jacket
high-visibility vest
light rail
man
muni
night
NTK
railroad construction
railroad tracks
rails
railway tracks
reflective jacket
reflective vest
safety helmet
safety vest
san francisco municipal railway
thermite welding
track maintenance
track work
welder
worker
working
January 29, 2012
2018 Market Street, San Francisco, CA 94114, USA