Low-alloy-steel welded-joint macroscopic metallographic detection method

Abstract

The invention provides a low-alloy-steel welded-joint macroscopic metallographic detection method The low-alloy-steel welded-joint macroscopic metallographic detection method comprises the following steps: step 1, processing a sample surface, cutting the to-be tested sample to obtain an examined surface of a welding seam, grinding the examined surface to be flat by a metallographic sample pre-grinding machine, and then performing polishing processing until the whole examined surface does not possesses obvious scratches; step 2, corroding the sample, concretely, putting the to-be tested sample processed in the step 1 into an acidic solution for immersing corrosion until the welding seam of the to-be tested sample subjected to corrosion is clear; step 3, cleaning and drying the sample, concretely cleaning the to-be tested sample processed in the step 2 and blowing until the sample is dry; and step 4, acquiring a macroscopic metallographic photograph, concretely, performing macroscopic metallographic shooting on the to-be tested sample processed in the step 3 and filing. The method improves the macroscopic metallographic detection accuracy and detection efficiency.

Description

Technical field [0001] The invention relates to a metallographic detection method, in particular to a macroscopic metallographic detection method for low alloy steel welded joints. Background technique [0002] At present, in the process of welding procedure qualification and welding work test piece verification, it is basically necessary to conduct macroscopic metallographic inspection of welded joints. With the rapid development of my country's rail transit, the requirements for its welding process and corresponding detection technology have gradually increased. Important components in rail vehicles such as: car body underframe, bogie frame, etc. are basically made of low alloy steel materials (such as Q345, S355J2, Q355GNH, etc.). In the process of macro-metallographic production of its welded joints, improper production processes are often used to easily cause the macro-metallographic display to be blurred, and the fusion of welded joints is not easy to judge, which affects ...

AI Technical Summary

Problems solved by technology

In the production process of the macroscopic metallography of the welded joints, the macroscopic metallographic display is often blurred due to improper production technology, and the fusion of the welded joints is difficult to judge, which affects the accurate evaluation of the quality of the welded joints, resulting in the macroscopic metallographic in the prior art. Poor detection accuracy and low detection efficiency