ABSTRACT
The aim of closing down the specimens to detect is to test before the tensile loading of the specimens and obtain the initial state signal. The mean
1 INTRODUCTION
Metal magnetic memory testing was put forward by Russian professor Dubois in the late 20th century (Dubov A A, 1999), which can accurately and reliably detect dangerous parts of iron work pieces that are characterized by the area of stress concentration, becoming the only effective nondestructive testing method in the early diagnosing of work pieces on the verge of injury and damage statuses. After nearly 20 years of research and development, the method now has been widely used in boiler pressure vessels, pipelines, turbine blades, engine crankshafts, bridges, railways, and other tastings (Ren Jilin, 2000 & Leng Jiancheng, 2010). Part of structural components in the Q345R steel container implement welding and assembly at the scene; the container is put into use without removing the welding residual stress, and the regular safety inspection is indispensable. In this paper, we carry out an experimental study on whether the ability of early warning in the metal magnetic memory method can conduct tastings and evaluations for the site welding parts of the container, obtain the magnetic memory signal characteristics of the basic metal, and weld assemblies and under the tensile loading process so as to provide channels for security evaluation of the container through a comparative analysis.
