公开(公告)号：US11847387B1

公开(公告)日：2023-12-19

申请号：US18131517

申请日：2023-04-06

Applicant: Tianjin University

Inventor： Lei Zhao ,  Lianyong Xu ,  Kai Song ,  Yongdian Han

IPC: G06F30/20 ,  G06F119/02 ,  G06F119/08

CPC classification number: G06F30/20 ,  G06F2119/02 ,  G06F2119/08

Abstract: The present invention discloses a method and system for predicting a creep-fatigue life of a structural part of a thermal power unit. The method includes: constructing a life prediction model; acquiring a stress relaxation curve in a strain control creep-fatigue test through pure creep data to calculate an initial creep damage; acquiring a cyclic hardening coefficient, an elasticity modulus and other related material constants through the pure fatigue data to calculate an initial fatigue damage; and acquiring a difference between strain energy densities in upper and lower parts of creep-fatigue mean stress, making the difference between strain energy densities less than a set threshold through dichotomy iteration to acquire a final creep damage, a final fatigue damage and an oxidative damage under such a circumstance, and predicting the creep-fatigue life of the high-temperature structural part based on the life prediction model.

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：US12163928B1

公开(公告)日：2024-12-10

申请号：US18809316

申请日：2024-08-19

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Lei Tian ,  Lei Zhao ,  Chao Feng ,  Molin Su ,  Yongdian Han

IPC: G01N3/36

Abstract: A detection device includes a frame body and a main pipe positioning assembly, a branch pipe positioning assembly, and a first driving assembly disposed on the frame body. One side of the frame body is provided with an opening. The branch pipe positioning assembly is disposed inside the opening. The first driving assembly adjusts the branch pipe positioning assembly, so that the branch pipe positioning assembly is adapted to positions of the two branch pipes. During detection, the branch pipes are located in the opening, the main pipe positioning assembly connects two ends of the main pipe, and the branch pipe positioning assembly connects the two branch pipes. Two limiting members are slidably disposed on the frame body to open and close the opening, and the limiting members abut against an outer wall of the main pipe, such that the main pipe is located inside or outside the opening.

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.

公开(公告)号：US12005531B1

公开(公告)日：2024-06-11

申请号：US18475243

申请日：2023-09-27

Applicant: Tianjin University

Inventor： Yongdian Han ,  Zhaowei Xue ,  Lianyong Xu ,  Lei Zhao ,  Kangda Hao

IPC: B23K9/095 ,  B23K9/028

CPC classification number: B23K9/0953 ,  B23K9/028

Abstract: A method of automatically welding a welded seam of a saddle line for a saddle-type T joint belonging to the technical field of welding is provided, including: establishing a groove cross-sectional model, solving a variation law of a groove cross-sectional area, and planning a welding bead and a welding process parameter according to the groove cross-sectional area; establishing a welding torch pose mathematical model and obtaining a pose homogeneous transformation matrix T of a welding torch; establishing a three-dimensional model of a main pipe and a branch pipe, building a welding system through offline software, importing welding spot pose information, and generating welding torch pose offline command through the offline software; and performing automatic welding of the welded seam of the saddle line for the saddle-type T joint according to the planned welding bead and the welding process parameter and the generated welding torch pose offline command.

公开(公告)号：US11926002B1

公开(公告)日：2024-03-12

申请号：US18475219

申请日：2023-09-27

Applicant: Tianjin University

Inventor： Yongdian Han ,  Zhaowei Xue ,  Lianyong Xu ,  Lei Zhao ,  Kangda Hao

IPC: B23K9/095 ,  B23K9/013 ,  B23K9/16 ,  B23K101/10

CPC classification number: B23K9/095 ,  B23K9/013 ,  B23K9/16 ,  B23K2101/10

Abstract: The invention belongs to the field of welding technology and discloses a CMT automatic overlaying method for opening in side wall of bimetallic composite pipes. The method includes: establishing a mathematical model of the opening in a side wall to be welded; Based on the mathematical model, determining the trajectory of the saddle line during overlaying; dividing the trajectory of the saddle line into several welding runs, all of which adopt the downslope welding process; establishing a three-dimensional model of the opening in the side wall to be welded and a CMT overlaying system simulation model; Based on the simulation model, planning the overlaying path of the CMT overlaying, and generating an overlaying offline instruction; Based on the offline instruction, performing CMT overlaying on the opening in the side wall to be welded according to the overlaying sequence, so as to obtain a weld overlay.

公开(公告)号：US12202080B1

公开(公告)日：2025-01-21

申请号：US18741735

申请日：2024-06-12

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Yongdian Han ,  Zhaowei Xue ,  Lei Zhao ,  Kangda Hao

IPC: B23K9/00 ,  B23K9/10 ,  B23K9/173

Abstract: A high-strength, high-toughness, and corrosion-resistant welding method for TKY nodes in a deepwater jacket includes the following steps: preheating T/K/Y nodes at a predetermined temperature according to a wall thickness of a base material; setting different welding parameters for different welding processes; and performing rooting weld on the preheated T/K/Y nodes through an electrode arc welding process, then performing filling weld through a gas metal arc welding process, and finally performing capping weld through the gas metal arc welding process. A corresponding electrode is selected for the rooting weld, a welding wire is selected for the capping weld according to low-strength matching, a welding wire is selected for the filling weld according to an equal-strength matching principle, and diffusible hydrogen contents of any electrode and any of the welding wires are all less than or equal to a predetermined diffusible hydrogen content.

公开(公告)号：US12061174B1

公开(公告)日：2024-08-13

申请号：US18619168

申请日：2024-03-28

Applicant: Tianjin University

Inventor： Lei Zhao ,  Lianyong Xu ,  Kai Song ,  Yongdian Han

IPC: G01N3/02 ,  G01N33/2045

CPC classification number: G01N3/02 ,  G01N33/2045 ,  G01N2203/0071

Abstract: The disclosure discloses a creep lifetime prediction method for a P92 main steam pipeline welded joint, which includes the following. Based on the minimally invasive sampling technology and the microstructure characterization equipment, the microstructure of the P92 steel welded joint after service is obtained. An area with a most significant degradation of the P92 steel welded joint is determined by performing grading processing on the microstructure of the welded joint. The maximum main stress of the structural component is obtained through the finite element technology and the actual service pressure of the P92 steel welded component. Through the maximum main stress and the microstructure after grading, based on the temperature-related Larson-Miller creep lifetime prediction method, the creep lifetime of the welded joint under the condition is determined.