公开(公告)号：US12259313B1

公开(公告)日：2025-03-25

申请号：US18824852

申请日：2024-09-04

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Yongdian Han ,  Yongle Shi ,  Lei Zhao ,  Kangda Hao

IPC: G01N17/02 ,  G01N1/32 ,  G01N17/00

Abstract: The disclosure relates to a rapid and comprehensive method for evaluating pitting resistance of stainless steel pipe welds. Weld samples are collected from different positions of one or more welds on the stainless steel pipe to obtain the surface oxide inclusion density and critical pitting temperature of each weld sample, the surface oxidation inclusion density is taken as an independent variable and the critical pitting temperature is taken as a dependent variable to obtain a fitting function formula between the surface oxidation inclusion density and the critical pitting temperature. The surface oxide inclusion density obtained by adopting the same welding process on the stainless steel pipe to be tested is substituted into the fitting function formula to obtain a standard critical pitting temperature of the weld to be tested. The pitting resistance of the weld of the stainless steel pipe to be tested can be evaluated rapidly, accurately, and comprehensively.

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：US20250076180A1

公开(公告)日：2025-03-06

申请号：US18818481

申请日：2024-08-28

Applicant: Tianjin University

Inventor： Lianyong Xu ,  Yongdian Han ,  Jiajun Shao ,  Lei Zhao ,  Kangda Hao

IPC: G01N17/02

Abstract: The disclosure provides a method for establishing a hydrogen charging model for pipeline steel in an equivalent wet hydrogen sulfide environment and an application thereof, which belongs to the field of corrosion electrochemistry. The method includes the following steps: using a cathode hydrogen charging method and a wet hydrogen sulfide environment method respectively to perform hydrogen charging on each sample to be tested under different reaction conditions to obtain several first hydrogen charging samples and second hydrogen charging samples; measuring the hydrogen content of each of the first hydrogen charging sample and the second hydrogen charging sample; performing curve fitting on the variables in the two methods respectively according to the obtained hydrogen content, and the hydrogen charging model for pipeline steel in the equivalent wet hydrogen sulfide environment is obtained according to the fitting result.

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：US20230324268A1

公开(公告)日：2023-10-12

申请号：US17716217

申请日：2022-04-08

Applicant: TIANJIN UNIVERSITY

Inventor： Lianyong XU ,  Lei Zhao ,  Yongdian Han ,  Chao Feng

IPC: G01N3/20 ,  B63B79/30

CPC classification number: G01N3/20 ,  B63B79/30 ,  G01N2203/0296 ,  G01N2203/0019 ,  G01N2203/0252 ,  G01N2203/0017 ,  G01N2203/0254

Abstract: Disclosed is a deepwater platform welded joint testing system. The testing system comprises a host unit, a hydraulic unit and a control unit, wherein the control unit is connected with the host unit and the hydraulic unit respectively; the host unit comprises a bearing frame placed on a bearing base, biaxial tension/compression loading oil cylinders mounted on the bearing frame, a lateral force resistant mechanism connected to the front ends of the biaxial tension/compression loading oil cylinders, counter-force supports fixed to the top end of the bearing frame and biaxial bending loading oil cylinders mounted on the counter-force supports. According to the deepwater platform welded joint testing system, through the independent or synergistic effect of the six loading oil cylinders, stretching and fatigue performance tests of a large complex structure under uniaxial tension/compression, uniaxial bending, biaxial tension/compression, biaxial bending and uniaxial/biaxial tension/compression and bending composite loads can be achieved.

公开(公告)号：US20250128331A1

公开(公告)日：2025-04-24

申请号：US18493752

申请日：2023-10-24

Applicant: Tianjin University

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

IPC: B22F10/85 ,  B22F10/28 ,  B22F10/32 ,  B22F10/64 ,  B22F10/66 ,  B22F12/10 ,  B22F12/37 ,  B33Y30/00 ,  B33Y40/20 ,  B33Y50/02

Abstract: The disclosure belongs to the field of advanced manufacturing technology and discloses a multi-field-assisted laser melting deposition composite additive manufacturing system. The system includes a vacuum chamber atmosphere protection module, a laser melting deposition module, an ultrasonic shock peening module, a workpiece transfer module, an auxiliary thermal field induction heating module, a laser shock peening module, and an integrated control module. The vacuum chamber atmosphere protection module, the laser melting deposition module, the ultrasonic shock peening module, the workpiece transfer module, the auxiliary thermal field induction heating module, and the laser shock peening module are electrically connected to the integrated control module individually and are collaboratively controlled by the integrated control module.

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.