Commonly used hardness measurement methods in weld hardness testing

Weld hardness is one of the important indicators for evaluating weld quality. During the welding process, the mechanical properties and organizational structure of the weld area may change due to the influence of local heating and cooling. Hardness is a physical quantity that measures the ability of a material to resist scratches and indentations. Therefore, by measuring the weld hardness, it is possible to evaluate whether the organizational structure and mechanical properties of the weld meet the requirements, thereby improving the quality and reliability of welding.

Commonly used weld hardness testing methods include Rockwell hardness, Brinell hardness, Vickers hardness and rock Rockwell hardness.These methods differ primarily in the hardness tester tip geometry and the magnitude of the applied load.

Rockwell hardness test is one of the commonly used methods for testing weld hardness. It uses a drill bit to apply a certain regular load on the surface of the material, and then measures the depth of the drill bit mark. Rockwell hardness test is suitable for general metal and alloy materials, and its maximum load can reach 980N.

Brinell hardness test is another method for measuring metal hardness. It uses a steel ball or drill bit to apply a certain load on the surface of the material, and then measures the diameter of the mark. The Brinell hardness test is suitable for various metals, including thinner plates and steel pipes.

The Vickers hardness test is a test method that uses the size of the notch on the surface of a metal or alloy material to measure the hardness. It is suitable for comparing the hardness of the same material and the surface hardness of different materials. The Vickers hardness test is a method commonly used to detect the hardness of single-phase and multi-phase materials. It uses a diamond triangular pyramid drill to apply a certain load on the surface of the material, and then measures the oblique length and width of the mark to calculate the hardness of the material.

The Rockwell hardness test for rock is a test method for measuring the hardness of rock. It uses a drill to apply a certain load on the surface of the rock, and then measures the depth and diameter of the mark to calculate the hardness of the rock.

In short, there are many types of weld hardness detection methods, and each method has its scope of application and characteristics. When choosing a specific detection method, it is necessary to comprehensively consider the actual situation and requirements to obtain accurate and reliable detection results.