I am loathe to be the grammar police....but is not the correct usage "soldered connection"?
Thus one can be a solderer if using Solder to solder a connection and the process being called "soldering".
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sol·der
ˈsä-dər
ˈsȯ-,
British also ˈsäl-də,
ˈsōl-
1
: a metal or metallic alloy used when melted to join metallic surfaces
especially
: an alloy of lead and tin so used
2
: something that unitessolder
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soldered; soldering ˈsä-d(ə-)riŋ
ˈsȯ-,
British also ˈsäl-,
ˈsōl-transitive verb
1
: to unite or make whole by solder
2
: to bring into or restore to firm union
a friendship soldered by common interestsintransitive verb
1
: to use solder
2
: to become united or repaired by or as if by solder
solderability
ˌsä-də-rə-ˈbi-lə-tē
ˌsȯ-
noun
solderer
ˈsä-dər-ər
ˈsȯ-
noun