Welding technology is a traditional subject, but with the rapid and comprehensive development of science and technology, welding technology will be given new connotation and extensive extension. Combining with the development history and research status of welding technology, this paper combs the basic problems and realization goals of welding science, welding technology and welding engineering, as well as the close relationship between the development of the three; discusses the thinking of scientific discovery of welding, innovative ideas of welding technology, and the creation method of welding process. Combined with the factors of welding material, process and structure, the innovative ideas and methods of "from 1 + 1 to calculus" are put forward. From the content, interest, motive force and purpose of welding innovation, this paper describes the supporting role of mathematics, physics and chemistry theory on welding science and engineering innovation and creation, and describes the thinking and ways of welding innovation creation from the concept of multi-dimensional and multi-scale material connection space, and further shows that welding discipline is an interdisciplinary, open sharing and innovative discipline system.