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Seamless aluminum tube metal hardness and its measurement method. At present, there are six national standards for metal hardness testing methods. These six national standards cover all testing methods for soft and hard metals. Meanwhile, according to the testing force status, these six national standards are divided into two methods: static testing force or dynamic testing force hardness testing. The national standard dynamic testing method can measure the hardness of some large workpieces, expanding the application range of hardness testing methods. Metal hardness is essentially the ability of a material to resist the intrusion of another harder material. Or rather, the ability of materials to resist local deformation, especially plastic deformation, indentation, or scratching. Hardness is an indicator of the hardness or softness of a metal. Hardness testing can reflect the different properties of metal materials under different chemical compositions, organizational structures, and heat treatment processes, so hardness testing is widely used in gold. In order to clarify the influence of different alloy elements in seamless aluminum tube cladding metal, 12 alkaline coating welding rods were designed, and the composition and hardness of the cladding metal were measured using a photoelectric direct reading spectrometer and a Rockwell hardness tester. The transformation characteristics of C, Ti, Nb, and V alloys and their influence on the hardness of the deposited metal were experimentally analyzed. The results of seamless aluminum pipes show that the transition of C element fluctuates greatly, and Nb and wear-resistant overlay welding are widely used surface strengthening technologies in mechanical engineering. The hardness of overlay welding metal is an important parameter affecting wear resistance, and hardness testing is convenient and easy to achieve. Therefore, hardness is commonly used to measure the wear resistance of overlay welding layers.
Hard alloy hardness has a prominent effect on improving the hardness and wear resistance of the cladding layer. Traditional cladding alloys mostly use W, V, and Cr carbides as strengthening phases [4-5], but the V transformation is relatively stable. The transformation and mutual influence of various elements; C and V have a significant solid solution strengthening effect, which can improve the hardness of the deposited metal, while Ti and Nb mainly form carbides. Excessive content will weaken the solid solution strengthening effect of carbon and reduce its hardness.
