Based on the analysis of the development of welding technology and characteristics of welding discipline

this paper points out that in the field of patent examination

books retrieval has an important meaning

and Duxiu Knowledge Search Database shows as one of the most important database

and is the necessary searching database in welding field

and combined with case analysis elaborated to point out Duxiu Knowledge Search Database is of importance in acquiring closest prior art

proofing common general knowledge

auxiliary reasoning

understanding and responding to comments stated by the applicant.