公开(公告)号：US20230228728A1

公开(公告)日：2023-07-20

申请号：US17954682

申请日：2022-09-28

Applicant: Tianjin University

Inventor： Yongdian HAN ,  Shifang ZHONG ,  Lianyong XU ,  Hongyang JING ,  Lei ZHAO ,  Kangda HAO

IPC: G01N33/207 ,  G01N30/62 ,  G01N33/2045 ,  B23K31/12

CPC classification number: G01N33/207 ,  G01N30/62 ,  G01N33/2045 ,  B23K31/125 ,  G01N2030/027

Abstract: The present invention discloses a quantitative evaluation method for sensitivity of welding transverse cold cracks in a typical joint of a jacket, including following steps: S1, performing macroscopic analysis, metallographic analysis, fracture analysis and hardness analysis on cracks of a failed component to obtain main causes of cold crack failure; and S2, designing and processing a dedicated sample, and performing rigid restraint crack tests on the dedicated sample at different preheating temperatures to obtain a cracking/non-cracking critical restraint stress σ1cr of the sample. According to the method, a rigid restraint crack test is applied to evaluation of sensitivity of welding transverse cracks, so that external restraint conditions borne by a welding joint can be accurately simulated, a stress state of the welding joint in an actual working condition can be truly reflected, the overall evaluation precision is greatly improved, and a foundation is laid for accurately evaluating sensitivity of welding cold cracks in a tube joint. Furthermore, a welding technology (base material, welding material, welding process and restraint level) is designed to restrain cold cracks from cracking, and the method has important theoretical significance and engineering value.