disunite vs weld together

disunite

verb
  • To cause disagreement or alienation among or within. 

  • To separate, sever, or split. 

  • To disintegrate; to come apart. 

weld together

verb
  • Used other than figuratively or idiomatically: see weld, together. 

  • To forge a social or emotional bond between people. 

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