Friction stir welding
https://openalex.org/C40367268
https://www.wikidata.org/wiki/Q2068127
Materials science
https://openalex.org/C192562407
https://www.wikidata.org/wiki/Q228736
Welding
https://openalex.org/C19474535
https://www.wikidata.org/wiki/Q131172
Microstructure
https://openalex.org/C87976508
https://www.wikidata.org/wiki/Q1498213
Fusion welding
https://openalex.org/C169312260
https://www.wikidata.org/wiki/Q1585171
Friction stir processing
https://openalex.org/C2776536451
https://www.wikidata.org/wiki/Q5503432
Metallurgy
https://openalex.org/C191897082
https://www.wikidata.org/wiki/Q11467
Aerospace
https://openalex.org/C167740415
https://www.wikidata.org/wiki/Q2876213
Aluminium
https://openalex.org/C513153333
https://www.wikidata.org/wiki/Q663
Previous research: What has been established or proposed
Several lines of evidence suggest that …
[INST] Please produce a sentence from the paper. The sentence should not mention the title of the paper, rather it be extracted from the Introducing Work section of the paper.
Please provide one singular full sentence from the paper that serves the function provided, using the example as guidance. Be specific, using relevant terminology from the paper.
Refrain from vague or generic statements. Finally produce a search query in the form of a question targeted towards the knowledge contained therein. 
You must output json with the structure of {'Sentence': sentence, 'Query': query}.
Field: "Metallurgy".
Paper: "Friction stir welding and processing"
Function: "Previous research: What has been established or proposed".
Example Sentence: "Several lines of evidence suggest that …". [/INST]