公开(公告)号：US11703497B1

公开(公告)日：2023-07-18

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: G01N1/28 ,  G01N3/02 ,  G01N3/06 ,  G01N21/88 ,  G01N23/04 ,  G01N30/02 ,  G01N30/06 ,  G01N33/207 ,  G01N30/62 ,  B23K31/12 ,  G01N33/2045

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

公开(公告)号：US12103112B2

公开(公告)日：2024-10-01

申请号：US17859442

申请日：2022-07-07

Applicant: Tianjin University

Inventor： Yongdian Han ,  Yuan Li ,  Lianyong Xu ,  Lei Zhao ,  Kangda Hao ,  Hongyang Jing

IPC: B23K31/12 ,  B23K31/02 ,  B23K103/16

CPC classification number: B23K31/125 ,  B23K31/02 ,  B23K2103/16

Abstract: The present disclosure relates to a method and system for predicting the critical floating time of a reinforcing phase. According to the method, a particle concentration processing model, a half-life processing model, an agglomeration kinetics model, and a floating time processing model are combined to obtain the critical floating time of a reinforcing phase particle according to an initial particle size of the reinforcing phase particle, a density of the reinforcing phase particle, a mass fraction of the reinforcing phase of a composite soldering material, and a density of the composite soldering material. The method and system can accurately predict the critical floating time of the reinforcing phase particle.

公开(公告)号：US20240391033A1

公开(公告)日：2024-11-28

申请号：US18671966

申请日：2024-05-22

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Kangda Hao ,  Yongdian Han ,  Lei Zhao ,  Wenjing Ren ,  Hongyang Jing

IPC: B23K31/02 ,  B23K37/00

Abstract: A welding method for improving quality of 5G all-position welding of a marine riser and a product thereof are provided, and the disclosure belongs to the technical field of welding. The welding method specifically includes the following. welding the marine riser in 5G all positions using a unified welding mode; reducing a predetermined voltage or reducing predetermined inductance in an overhead welding position to improve directivity and stability of an arc; and meanwhile increasing an arc swing width in the overhead welding position to eliminate a lack-of-fusion defect. In the disclosure, a unified welding mode suitable for flat welding is applied to marine riser welding. The process of 5G all-position welding of the marine riser is effectively simplified. The welding quality of 5G all-position welding of the marine riser is thereby effectively improved.

公开(公告)号：US20240391031A1

公开(公告)日：2024-11-28

申请号：US18671997

申请日：2024-05-23

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Kangda Hao ,  Yongdian Han ,  Lei Zhao ,  Wenjing Ren ,  Hongyang Jing

IPC: B23K28/02 ,  B23K9/173 ,  B23K26/082 ,  B23K101/10

Abstract: A simplified method for welding a 5G position filler layer of a marine riser and a product thereof are provided, and the disclosure belongs to the technical field of welding. The method specifically includes the following. performing filler welding on the marine riser using an oscillation scanning laser-GMAW hybrid welding process; performing welding on each layer using same process parameters, then reducing gravity of a molten pool and increasing an arc force through interaction between laser and an arc, meanwhile expanding a range of a welding molten pool through an oscillation scanning behavior of the laser beam. A lack-of-fusion defect is prevented from being generated. A 5G position filler layer welding process of the marine riser is effectively simplified in the disclosure. Further, laser beam scanning also expands the range of the welding molten pool and prevents generation of the lack-of-fusion defect on a side wall.