Abstract: In the process of shipbuilding, the knowledge in the field of hull welding is lack of
effective induction, which results in poor reusability and sharing. To solve these problems, based on
knowledge engineering technologies, this paper studies the methods of knowledge acquisition,
classification, representation and reasoning application in hull welding and develops a knowledge
base of techniques, which effectively realizes the sharing and reuse of knowledge. Firstly, a
classification mode and access to acquire the knowledge of hull welding were put forward. Secondly,
on this basis, the results of the research on knowledge representation method based on ontology was
applied to the hull welding process and a domain ontology was established. Thirdly, a reasoning mode
of welding process was put forward, and a rule base of process was established based on normative
documents such as national standards and industry standards and instructive documents such as
professional books and expert opinions, then a fuzzy rule reasoning system was designed. Finally a
knowledge base system for hull welding process was designed and developed, and such functions
were standardized as knowledge acquisition, knowledge representation, knowledge reasoning and
knowledge management, providing support platform of knowledge sharing and reuse for related personnel in the field of hull welding, and providing implications for the use of knowledge engineering technologies in other fields of shipbuilding.

Key words: hull welding process, knowledge engineering, ontology, fuzzy reasoning, knowledge base;
knowledge sharing