commixture vs soldering

commixture

noun
  • The act or state of being mixed together; a union or mingling of constituents; commixtion. 

soldering

noun
  • A method of joining two metallic surfaces by melting an alloy between them. 

  • A soldered joint. 

  • An instance of soldering. 

How often have the words commixture and soldering occurred in a corpus of books? (source: Google Ngram Viewer )