Evaluation method of electrodeposition coating property of welded joints, electrodeposition coating property evaluation device of welded joints, and manufacturing method of welded joints

摘要

PROBLEM TO BE SOLVED: To manufacture an electrodeposition coating property evaluation method and an electrodeposition coating property evaluation device of a welding joint which can easily predict the electrodeposition coating property of various types of welded joints, and a welded joint having a high electrodeposition coating property. Provide a method. SOLUTION: The method for evaluating the electrodeposition coating property of a welded joint according to one aspect of the present invention includes a step of bringing a first terminal of an insulation resistance meter into contact with a welding slag adhering to the surface of a weld bead of the welded joint. The process of bringing the second terminal of the insulation resistance meter into contact with the base material of the welded joint, the process of applying a voltage of 50 to 500 V between the first terminal and the second terminal, and the first terminal and the second terminal. It is provided with a step of measuring the electric resistance value between the two. The electrodeposition coating property evaluation device for a welded joint according to another aspect of the present invention has an insulation resistance tester having a first terminal and a second terminal and capable of applying a voltage of 50 to 500 V, a stage, and a first. A position control means capable of controlling the positional relationship between the terminal and the stage is provided. [Selection diagram] Fig. 2