append vs weld

append

verb
  • To add, as an accessory to the principal thing; to annex 

  • To write more data to the end of a pre-existing file, string, or other object. 

  • To hang or attach to, as by a string, so that the thing is suspended 

noun
  • An instance of writing more data to the end of an existing file. 

weld

verb
  • To bind together inseparably; to unite closely or intimately. 

  • To join two materials (especially two metals) together by applying heat, pressure and filler, either separately or in any combination. 

noun
  • The joint made by welding. 

  • A herb (Reseda luteola) related to mignonette, growing in Europe, and to some extent in America, used to make a yellow dye. 

  • The yellow coloring matter or dye extracted from this plant. 

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