Manufacturing method of internal crack defect testing plate for non-destructive testing teaching

TLDR: In this article, a manufacturing method of an internal crack defect testing plate for non-destructive testing teaching is presented, in which the welded joint cold crack generation mechanism in the welding process is utilized, the high-constraint testing plate butt joint mode is adopted, a high-carbon-equivalent welding material is used, normal-temperature welding is conducted and supplemented by application of the forced rapid cooling measure after welding is accomplished, a product is placed for 24 hours, and therefore a welded joints internal crack which meets the requirements for the designed crack position,

Abstract: The invention discloses a manufacturing method of an internal crack defect testing plate for non-destructive testing teaching. The manufacturing method comprises the steps that the welded joint cold crack generation mechanism in the welding process is utilized, the high-constraint testing plate butt joint mode is adopted, a high-carbon-equivalent welding material is utilized, normal-temperature welding is conducted and supplemented by application of the forced rapid cooling measure after welding is accomplished, a product is placed for 24 hours, and therefore a welded joint internal crack which meets the requirements for the designed crack position, the depth and the length can be formed; and then a clamp and a testing plate point fixation are disassembled, bottoming welding is conducted in the region without the designed crack, a defect testing plate is filled and subjected to face covering welding, finally the welded joint surface cleaning is conducted, and the manufacture of the testing plate is accomplished. The welded joint internal crack formed according to the manufacturing method is different from the artificial defect in a common non-destructive testing standard testing plate, the crack defect is real, and the method is feasible, can be used for conducting non-destructive testing such as ultrasonic non-destructive testing, and training and examining non-destructive testing personnel, and has the important significance in enhancing the understanding of the non-destructive testing personnel for crack defect detection signals. The manufacturing method of the internalcrack defect testing plate for non-destructive testing teaching has the advantages of being flexible and accurate in locating, meeting the requirement of actual teaching and training and being broad in application range.