Study On Plasma Temperature And Pllasma Composition Of Underwater Welding

Underwater wet welding technology has been more and more widely used in recent years.Underwater wet welding technology is inseparable from laying pipes in the water,repairing underwater components,and underwater maintenance of ships.However,the working environment of underwater wet welding is complicated,and the welding effect is often not ideal.Many studies have focused on improving the process to improve the quality of underwater wet welding,and there have been few related studies on the mechanism of arc welding,In addition,the arc plasma composition of underwater wet welding directly affects the welding stability and welding quality,but the related research on the arc plasma composition of underwater wet welding has been scarce,and there is a lack of spectral wet welding.Arc Plasma Composition for Diagnostic Studies.Based on this,this paper uses spectral analysis to study the arc plasma temperature and electron number density of the underwater wet welding arc initiation process.The calculation results can be used to further explore the underwater wet welding arc from the perspective of arc physics.The physical nature of the process,which guides and seeks more effective arc-ignition methods provides important references;Furthermore,the spectral diagnosis method was combined with the arc burning process of underwater wet welding to determine the main elements to be considered in the calculation of the arc plasma composition.Based on this,the Newton iteration method was used to solve the Saha equation and the quasi-neutral charge And the atomic conservation equations,and the number density of each component particle is calculated,The calculation results lay the foundation for the research of the underwater wet arc from the mechanism level,and also provide a theoretical basis for the further study of the thermodynamic properties and radiation properties of the underwater wet welding arc.The main tasks as follows:Chapter 1::Introduces the research status and development trend of underwater wet welding technology at home and abroad.At the same time,the work content,research focus and difficulties of this paper are put forward.Chapter 2: Introduces the theoretical basis for calculating the spectral diagnosis of underwater wet welding arc,describes the calculation method of plasma temperature and electron number density during the arc initiation process,and introduces the calculation principle of arc plasma composition.Chapter 3: The underwater wet welding experimental platform is set up,the components of the platform are introduced,and the working process of the arc spectrum diagnostic system is mainly described.Chapter 4: The arc plasma temperature and electron number density of the arc welding process of underwater wet welding under different water depth conditions are calculated and related analysis is performed.The arc plasma temperature and electron number density of the arc initiation process under flowing water conditions were calculated and compared with the still water conditions.Chapter 5: Based on the analysis of the underwater wet welding reaction process,combined with the information of the underwater wet welding arc spectrum diagnosis,18 kinds of particles of the arc plasma component to be considered in the calculation are determined.Equations,dissociation ionization equations,quasi-neutral equations,gas pressure balance equations,etc,The number density of each particle was solved iteratively by MATLAB program,and the number density of each particle was calculated under the conditions of 0.3m,20 m and 40 m water depth and the correlation analysis was performed.Chapter 6 summarizes the work of the full text,analyzes the deficiencies,and looks forward to the follow-up work.