Wordnet 3.0
NOUN (1)
1. 
 a worker who joins or mends with solder; 
The Collaborative International Dictionary of English v.0.48:
Solderer \Sol"der*er\, n.
   One who solders.
   [1913 Webster]
WordNet (r) 3.0 (2006):
solderer
    n 1: a worker who joins or mends with solder