background
blue
bolt
build
burner
business
cheap
closeup
company
construction
cool
cooling
cut
dangerous
expensive
facility
factory
flame
flow
forming
gas
hard work
hardened steel
hardening
hazard
heated
hot
iron
job
melt
metal
overheat
process
production
products
profit
spring
stainless
steel
technology
thermo
threads
tools
torch
unhealthy
valokuva24
weld
work
worker
working
定額
Hardening an iron bolt in home conditions with the gas torch. Close image of blue flame turning yellow as temperature drops.の素材 [FY310109504582]
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