scholarly journals Design and Fabrication of Remote Welding Equipment in a Hot-Cell

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Soosung Kim ◽  
Kihwan Kim ◽  
Jungwon Lee ◽  
Jinhyun Koh
Keyword(s):  
Nuclear Fuel ◽  
Performance Test ◽  
Preliminary Investigation ◽  
Welding Process ◽  
Resistance Welding ◽  
Welding Equipment ◽  
End Plate ◽  
Fuel Fabrication ◽  
Fuel Bundle ◽  
Remote Welding

The remote welding equipment for nuclear fuel bundle fabrication in a hot-cell was designed and developed. To achieve this, a preliminary investigation of hands-on fuel fabrication outside a hot-cell was conducted with a consideration of the constraints caused by the welding in a hot-cell. Some basic experiments were also carried out to improve the end-plate welding process for nuclear fuel bundle fabrication. The resistance welding equipment using end-plate welding was also improved. It was found that the remote resistance welding was more suitable for joining an end-plate to end caps in a hot-cell. This paper presents an outline of the developed welding equipment for nuclear fuel bundle fabrication and reviews a conceptual design of remote welding equipment using a master-slave manipulator. Furthermore, the mechanical considerations and a mock-up simulation test were described. Finally, its performance test results were presented for a mock-up of the remote resistance welding equipment for nuclear fuel bundle fabrication.

Remote Resistance Welding of Zr-4 Endplate for DUPIC Fuel Fabrication

2008 ◽  
Vol 580-582 ◽  
pp. 397-400 ◽  
Author(s):  
Soo Sung Kim ◽  
Dae Seo Koo ◽  
Geun Il Park ◽  
Jin Hyun Koh
Keyword(s):  
Preliminary Investigation ◽  
Welding Process ◽  
Resistance Welding ◽  
Optimum Conditions ◽  
Candu Reactors ◽  
Welding Technology ◽  
Fuel Fabrication ◽  
Hands On ◽  
End Caps ◽  
Direct Use

The remote resistance welding technology in the hot cell environment for DUPIC (Direct Use of spent PWR fuel In CANDU reactors) fuel fabrication was established. To do this, a preliminary investigation for hands-on fuel fabrication outside the hot cell was conducted in the consideration of constraints caused by welding in the hot cell. Further welding experiments were carried out to improve the RW process. A remote resistance welding apparatus was developed. The characteristics of welds made by RW and LBW were compared in terms of the weld nugget penetrations and torque strength. It was found that resistance welding was a more suitable welding process for joining the endplate to the end caps in the hot cell. The optimum conditions for RW in the hot cell operation in a remote manner were also obtained.

Development of a Remote Welding Machine for a DUPIC Fuel Bundle Fabrication

2009 ◽  
Author(s):  
Soo-sung Kim ◽  
Geun-il Park ◽  
Jung-won Lee ◽  
Jin-hyun Koh
Keyword(s):  
Preliminary Investigation ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Resistance Welding ◽  
Welding Parameters ◽  
Current Electrode ◽  
Welding Machine ◽  
Hands On ◽  
Welding Processes ◽  
Remote Welding

A remote welding machine for a DUPIC (Direct Use of spent PWR fuel In CANDU reactors) bundle fabrication was designed to establish the optimum welding processes in a hot cell environment. An initial investigation for hands-on fabrication outside the hot cell was performed in the consideration of the constraints of welding machine in the hot cell conditions. Gas tungsten arc welding (GTAW), laser beam welding (LBW), friction welding (FW), and resistance welding (RW) process were assessed as candidates for this application. A preliminary welding investigation to improve the RW process was also performed. The RW process was determined to be the most suitable process in a hot cell environment for joining an endplate to an endcap. An advantage of RW would be a qualified process for overlapped plates welding for which there is extensive production experience were available. A preliminary investigation for a hands-on fuel fabrication outside the hot cell was conducted in the consideration of the constraints caused by a welding in a hot cell. The optimum resistance welding parameters for the endplate welding process were obtained in terms of the current, electrode pressure and welding cycle. This paper presents an outline of the developed RW machine for a DUPIC bundle fabrication and reviews the conceptual design of a remote RW welder by using a master-slave manipulator. The design of RW machine by using the 3D modeling method was also designed. Furthermore the integrity of the welds by the resistance welding was confirmed by the results of the torque test, an examination of the microstructure and the fracture surfaces of the welds.

scholarly journals Multi-Objective Optimization of Resistance Welding Process of GF/PP Composites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2560
Author(s):  
Guowei Zhang ◽  
Ting Lin ◽  
Ling Luo ◽  
Boming Zhang ◽  
Yuao Qu ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Welding Process ◽  
Welding Current ◽  
Resistance Welding ◽  
Thermoplastic Composites ◽  
Current Time ◽  
Process Factor ◽  
Welding Equipment ◽  
Lap Shear ◽  
Adhesive Connections

Thermoplastic composites (TPCs) are promising materials for aerospace, transportation, shipbuilding, and civil use owing to their lightweight, rapid prototyping, reprocessing, and environmental recycling advantages. The connection assemblies of TPCs components are crucial to their application; compared with traditional mechanical joints and adhesive connections, fusion connections are more promising, particularly resistance welding. This study aims to investigate the effects of process control parameters, including welding current, time, and pressure, for optimization of resistance welding based on glass fiber-reinforced polypropylene (GF/PP) TPCs and a stainless-steel mesh heating element. A self-designed resistance-welding equipment suitable for the resistance welding process of GF/PP TPCs was manufactured. GF/PP laminates are fabricated using a hot press, and their mechanical properties were evaluated. The resistance distribution of the heating elements was assessed to conform with a normal distribution. Tensile shear experiments were designed and conducted using the Taguchi method to evaluate and predict process factor effects on the lap shear strength (LSS) of GF/PP based on signal-to-noise ratio (S/N) and analysis of variance. The results show that current is the main factor affecting resistance welding quality. The optimal process parameters are a current of 12.5 A, pressure of 2.5 MPa, and time of 540 s. The experimental LSS under the optimized parameters is 12.186 MPa, which has a 6.76% error compared with the result predicted based on the S/N.

Development of Repair Technologies for J-Groove Welds of Drain and Instrument Nozzle in Steam Generator

2009 ◽  
Author(s):  
Kwang Soo Park ◽  
Chang Sig Kong ◽  
Seon Ho Lee ◽  
Woo Sung Kim
Keyword(s):  
Steam Generator ◽  
Welding Process ◽  
Outer Wall ◽  
Field Application ◽  
Repair System ◽  
Monitoring Tool ◽  
Welding Equipment ◽  
Gas Tungsten Arc ◽  
Primary Water ◽  
Remote Welding

SG drain & instrument nozzles and their welds fabricated with alloy 600 and alloy 82/182 is susceptible to Primary Water Stress Corrosion Cracking (PWSCC). In Korea, the cracks due to PWSCC were discovered in the drain nozzle of Yongkwang units 3 & 4. Doosan has developed a system for steam generator to repair damaged drain nozzle & welds and to prevent further damage on the instrument nozzle & welds. The repair system consists of machining, welding equipment and installation tool for this equipment. The machining equipment is used to remove the nozzle and J-groove welds. The process is called mechanical machining and the main equipment is installed on steam generator’s outer wall. The welding equipment is designed for the machined J-groove welds and overlay. The auto welding equipment consists of welding head, controller, monitoring tool and Gas Tungsten Arc Welding (GTAW) power supply. Doosan has developed remote welding process using the monitoring tool. The installation tool consists of automatic installment tool for instrument nozzle and manual installment tool for drain nozzle. Doosan successfully completed a mockup test and field application for Yongkwang unit 3.

Design of the Clamping Mechanism on Welding Equipment in Hot Chamber

2015 ◽  
Vol 741 ◽  
pp. 3-8
Author(s):  
Fang Quan Chen ◽  
Guo Xiang Chen ◽  
Dao Yong Shao
Keyword(s):  
Nuclear Fuel ◽  
Working Conditions ◽  
Welding Process ◽  
Good Stability ◽  
Fuel Rods ◽  
Welding Equipment ◽  
Nuclear Fuel Rods

This text introduces one non-standard new clamping mechanism which is used to clamp the nuclear fuel rods in welding process. For hard working conditions in hot cell, it requires that the equipment should be anti-radiation, also with good stability and certain precision.

Development of Electron Beam Welding Technology Using AA6061-T6 Aluminum Alloy for Nuclear Fuel Plate Assembly

2013 ◽  
Author(s):  
Soo-sung Kim ◽  
Don-bae Lee ◽  
Yoon-sang Lee ◽  
Jong-man Park
Keyword(s):  
Aluminum Alloy ◽  
Electron Beam ◽  
Nuclear Fuel ◽  
Cross Sections ◽  
Electron Beam Welding ◽  
Preliminary Investigation ◽  
Welding Process ◽  
Beam Current ◽  
Welding Parameters ◽  
Plate Assembly

This study was carried out to establish the electron beam welding process for a nuclear fuel plate assembly fabrication. A preliminary investigation for plate fuel fabrication was conducted with a consideration of weld performance using AA6061-T6 aluminum alloy made by the EBW (Electron Beam Welding) process. The optimum welding parameters for the fuel plate assembly were obtained in terms of the accelerating voltage, beam current and welding time. The welds made by the optimum parameters showed slightly lower tensile strengths than those of the un-welded specimens. The integrity of the welds by the EBW process was confirmed by the results of the tensile test, an examination of the macro-cross sections and the fracture surfaces of the welded specimens.

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