Abstract: The intelligent application research and innovation in welding quality analysis and evaluation requires industrial mechanism models and analytical methods for visualization, low-code development, and intelligent construction. The low-code visualization analysis of the welding process provides a signal analysis method based on mechanism models, which can help the shipbuilding industry solve quality problems during the welding process. This software includes analysis functions such as U-I phase diagrams, feature analysis, and short-circuit-specific analysis. Using ship engine welding as a case study, users can independently build a welding quality rating model according to the U-I phase diagrams and other functions, and achieve real-time output of on-line welding quality rating. This verifies the effectiveness of the software in welding quality analysis and evaluation, which can improve the efficiency and accuracy of the welding quality evaluation.