The LB-TRC Test for Cold Crack Susceptibility of Weld Metal for High Strength Steels(Materials, Metallurgy, Weldability)

概要

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This investigation is made to establish a new testing method for hydrogen-induced cracking of weld metal of high strength steel. The principle of this testing method which is named the LB-TRC (Longitudinal Bead-TRC) test is that two test specimens are butted together to provide a slit across which a test bead is laid and then a constant load is applied parallel to the weld line after welding. Then, a transverse crack occurs at the slit after a period depending on hydrogen content, stress level and type of material. Therefore, the testing machine doesn't require a large capacity in load and in size. Then, the relations between the fracture stress and the fracture time were measured in different level of hydrogen in welding electrode for HT-60 and HT-80 high strength steels. Consequently, it was shown that the lower critical stress and the fracture mode in the LB-TRC tested specimen were approximately equal to those obtained in the original TRC test, and that the LB-TRC test was useful to evaluate cold cracking susceptibility of weld metal.
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