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The act of heating two members of steel up to a very high temperature in order to fuse the two members together. This is usually performed using a torch.

Merriam-Webster Online Dictionary
weld (verb)
intransitive verb
transitive verb
to become or be capable of being - welded
a) to unite (metallic parts) by heating and allowing the metals to flow together or by hammering or compressing with or without previous heating
b) to unite (plastics) in a similar manner by heating
c) to repair (as an article) by this method
d) to produce or create as if by such a process
to unite or reunite closely or intimately - architecture that welds the past and the present
weld (noun)
a joint - welded
union by the state or condition of being welded - welding