• 제목/요약/키워드: Metal inlay

검색결과 23건 처리시간 0.025초

원자로 입출구 노즐 Alloy 82/182 이종금속 용접부 Weld Inlay 적용 후 초음파나노표면개질이 잔류응력 완화에 미치는 영향 (The effect of ultrasonic nano crystal surface modification for mitigation of the residual stress after weld inlay on the alloy 82/182 dissimilar metal welds of reactor vessel in/outlet nozzles)

  • 조홍석;박익근;정광운
    • Journal of Welding and Joining
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    • 제33권2호
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    • pp.40-46
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    • 2015
  • This study was performed to investigate the effect of ultrasonic nano crystal surface modification (UNSM) on residual stress mitigation after Weld Inlay repair for butt dissimilar metal weld with Alloy 82/182 in reactor vessel In/Outlet nozzle. As-welded and Weld Inlay specimens were made in accordance with design standard of ASME Code Case N-766, and two planes of their weld specimens were peened by the optimum UNSM process condition. Peening characteristics for weld specimens after UNSM treatment were evaluated by surface roughness and Vickers hardness test. And, residual stress for weld specimens developed from before and after UNSM treatment was measured and evaluated by instrumented indentation technique. Consequently, it was revealed that the mitigation of residual stress in weld metal after Weld Inlay repair of reactor vessel In/Outlet nozzle could be possible through UNSM treatment.

이종금속용접부 예방정비 방법에 따른 잔류응력 분포 고찰 (Investigation on the Effects of Preventive Maintenance Schemes for Dissimilar Metal Welds on the Residual Stress Distribution)

  • 송태광;최영환;박정순;정해동;오창영
    • 한국압력기기공학회 논문집
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    • 제7권4호
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    • pp.1-11
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    • 2011
  • This paper presents the effects of preventive maintenance schemes on the residual stress distributions in dissimilar metal welds. Dissimilar metal weld is known susceptible to PWSCC and thus, effective maintenance schemes to prevent PWSCC are needed. Three preventive maintenances schemes, i.e. weld overlay, MSIP and inlay weld which are widely used in nuclear power plants, are selected and their effects on welding residual stresses are investigated via finite element analyses. As results, weld overlay and MSIP were proved effective method to mitigate residual stresses and inlay weld, on the other hand, produces strong tensile residual stresses in the inner surface. Although Alloy 690 known to be resistant to PWSCC are used in inlay weld, continuous careful observation are needed since tensile welding residual stresses are key parameter for PWSCC.

고대 금속 선상감 기법의 쟁점과 그 해석 - 백제 선상감 자료를 중심으로 - (Issues in Ancient Metal Wire Inlay: A Case Study of Relics from Baekje)

  • 최기은
    • 박물관보존과학
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    • 제20권
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    • pp.13-30
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    • 2018
  • 고대 금속 상감기법은 선상감이 주류를 이루며, 철을 바탕금속으로 하여 'V'자형 또는 'U'자형 등의 홈을 판 후, 금, 은 등의 상감 재료를 감입하여 제작된다. 고대의 금속 선상감에 대한 기존 연구는 보존처리 과정 중에서 조사된 유물의 현미경 사진 등을 기반으로 하여 제작기법을 유추해 왔지만, 선상감기법의 미시적 조사에는 한계가 있다. 따라서 선상감기법의 조사는 기존의 방식과 더불어, 실체현미경을 활용하여 투과광하에서 X-선 필름을 확대 사진촬영하는 방식이 훨씬 유효한 방법이었다. 그리고 선상감의 제작 공정 중 가장 핵심적인 기술은 '정을 이용하여 홈을 파는 공정'과 '상감선을 만드는 공정'으로 연구자 간의 쟁점도 이러한 2가지 공정에서 차이를 보인다. 따라서 실체현미경을 활용한 X-선 필름 판독 등을 통해 핵심 공정에 대한 백제 선상감 자료를 전수조사한 결과, 백제 선상감 자료는 크게 소성가공의 축조기법을 기반으로 하는 천안·공주지역의 계통과 절삭가공의 모조기법을 기반으로 하는 오산·서산·완주지역의 계통으로 양분되는 것으로 조사되었다. 그리고 이러한 상감 기술의 계통적 구분은 제작 집단 또는 이입 루트의 이원화에 의해 기인된 결과로 해석하였다.

삼국시대의 유물에 나타난 입사공예기법 비교분석 연구 (A Study on Comparative Analysis of Inlay Craft Technique of Relic in the Three Kingdom Period)

  • 박지원;박승철
    • 디지털융복합연구
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    • 제12권11호
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    • pp.505-513
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    • 2014
  • 현대 금속공예는 대량생산을 목표로 예술성이 결여된 단순한 표현 방법과 한정적 기술만을 사용하여 우리의 전통과 개성이 상실되어가고 있다. 앞으로 현대 금속공예의 발전과 우리 고유의 문화를 계승하기 위해서는 고대부터 전해온 전통공예기법을 고찰해야 할 필요성을 갖는다. 입사공예는 고도의 집중력과 기술력을 필요로 하며 당대 문화와 사상을 잘 보여주는 대표적인 전통금속공예기법이다. 입사기법이 국내에 처음으로 나타난 시대는 삼국시대로 백제, 가야, 신라에서 찾아볼 수 있다. 나아가 입사공예를 현대금속공예에 활용하였을 때 우리 고유의 예술적인 표현과 역사적 가치를 부여할 수 있는 가능성을 발견할 수 있었다. 이를 위해 전통의 기법을 명확하게 익힐 수 있는 교육의 기회를 넓히고 현대공예에 알맞게 수용할 수 있는 실용적 방안을 지속적으로 모색해야 비로소 현대 금속공예의 발전과 우리 고유의 개성을 확고히 자리매김하기 할 수 있을 것으로 전망한다.

조선시대 관영수공업에서 입사장(入絲匠)의 직무 유형과 역할 (Joined in the government-owned handicraft industry during the Joseon Dynasty Job type and role)

  • 김세린
    • 헤리티지:역사와 과학
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    • 제54권2호
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    • pp.216-239
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    • 2021
  • 공예품의 표면에 홈을 파고 금속 재료를 감입하는 시문 기법인 입사(入絲)는 조선시대 왕실의 일상 생활용품, 의례품, 관청의 공적 기물에 두루 사용되었다. 조선시대 관영수공업은 중앙관청에 소속된 경공장(京工匠), 지방의 외공장(外工匠)으로 구성된 관장(官匠)을 중심으로 운영되었다. 입사장은 경공장에 편입되어 왕실과 중앙관청의 공예품 입사시문을 담당했다. 현재 전해지는 조선시대 입사장에 대한 기록은 관영수공업에 집중되어 있다. 관영수공업에서의 입사장의 배속 관청은 공조와 상의원, 군영으로 나눌 수 있으며, 여기에 앞의 두 소속 장인의 도감 차출이 있다. 입사공예품을 사용하는 관청과 군영에 입사장을 배치하고, 제작 마감 기한이 촉박해 평소보다 세밀한 분업과 협업이 전개되었던 도감에서는 입사장을 입사장, 은입사장으로 나누어 공역에 투입했다. 이를 통해 제작 상황과 보유 기술을 고려해 유동적으로 장인을 배치해 공예품 제작이 이루어졌음을 알 수 있었다. 이러한 제작 체제의 운영은 장인의 손기술로 모든 공예품을 제작해야 했던 근대 이전 조선 사회에서는 필수적인 것이었다. 본 논문은 입사장을 중심으로 조선시대 관영수공업에서 장인의 역할과 직무 형태를 유형을 나누어 살펴보았다. 직능의 특성과 재료, 인력 수급 등 세부적으로 적용되는 내용은 다르지만, 조선이 추구했던 기본적인 관영수공업 정책의 틀 안에서 장인의 기술을 통한 다양한 목적의 공예품 구현을 위한 여러 제도적 장치는 거의 공통적이었다. 앞으로 의궤에 기록된 재료와 도구, 소수이지만 문헌에 기록된 관장과 사장의 기록을 더해 기술 문화를 분석한다면 조선시대 공예를 보다 입체적으로 접근하는 데 도움이 될 것이라 생각한다.

원자로 입출구 노즐 이종금속 용접부 Weld Inlay 레이저 클래딩 공정 개발 (Process Development of Laser Cladding for Weld Inlay Repair of Dissimilar Metal Weld in Reactor Vessel In/Outlet Nozzles)

  • 조홍석;정광운;모민환;조기현;최동철;이장욱;조상범
    • 한국압력기기공학회 논문집
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    • 제11권1호
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    • pp.53-60
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    • 2015
  • This study was investigated to develop process technology of laser cladding with austenite stainless steel for Weld Inlay repair of dissimilar metal weld in reactor vessel in/outlet nozzles. Weld Inlay experiments were performed by laser cladding repair system consisting of common manipulator, laser apparatus and welding process scheduler, etc. Single pass welding experiments were conducted in order to obtain the optimum welding process parameters for filler wires of ER309L and Alloy 52M before multi-layer laser cladding. Based on the above obtained results, multi-layer laser cladding experiments were carried out, and welding qualities for weld specimens were estimated by PT, OM, SEM and EDS analysis. Consequently, it was revealed that multi-layer laser cladding on austenite stainless steel using filler wires of ER309L and Alloy 52M could be possible to meet ASME Code standard without any weld defect.

Fiber Reinforced Inlay Adhesion Bridge

  • Cho, Lee-Ra;Yi, Yang-Jin;Song, Ho-Yong
    • 대한치과보철학회지
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    • 제38권3호
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    • pp.366-374
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    • 2000
  • FRC/ceromer system provides the clinician with a durable, flexible, and esthetic alternative to conventional porcelain fused to metal crowns. FRC is the matrix which is silica-coated and embedded in a resin matrix. The ceromer material which is a second generation indirect composite resin contains silanized, microhybrid inorganic fillers embedded in a light-curing organic matrix. FRC/ceromer restoration has a several advantages: better shock absorption, less wear of occluding teeth, translucency, color stability, bonding ability to dental hard tissues, and resiliency. It has versatility of use including inlay, onlay, single crown, and esthetic veneers. With adhesive technique, it can be used for single tooth replacement in forms of inlay adhesion bridge. In single tooth missing case, conventional PFM bridge has been used for esthetic restoration. However, this restoration has several disadvantages such as high cost, potential framework distortion during fabrication, and difficulty in repairing fractures. Inlay adhesion bridge with FRC/ceromer would be a good alternative treatment plan. This article describes a cases restored with Targis/Vectris inlay adhesion bridge. Tooth preparation guide, fabrication procedure, and cementation procedure of this system will be dealt. The strength/weakness of this restoration will be mentioned, also. If it has been used appropriately in carefully selected case, it can satisfy not only dentist's demand of sparing dental hard tissue but also patient's desire of seeking a esthetic restorations with a natural appearance.

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IN VITRO EVALUATION OF FRACTURE RESISTANCE OF VARIOUS THICKNESS FIBER- REINFORCED COMPOSITE INLAY FPD

  • Yi Yang-Jin;Yoon Dong-Jin;Park Chan-Jin;Cho Lee-Ra
    • 대한치과보철학회지
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    • 제41권6호
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    • pp.762-771
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    • 2003
  • Statement of problem. In dentistry, the minimally prepared inlay resin-bonded fixed partial denture (FPD) made of new ceromer / fiber-reinforced composite (FRC) was recently introduced. However, the appropriate dimensions for the long-term success and subsequent failure strength are still unknown. Purpose. The aim of this study was to investigate the most fracture-resistible thickness combination of the ceromer / FRC using a universal testing machine and an AE analyzer. Material and Methods. A metal jig considering the dimensions of premolars and molars was milled and 56-epoxy resin dies, which had a similar elastic modulus to that of dentin, were duplicated. According to manufacturer's instructions, the FRC beams with various thicknesses (2 to 4 mm) were constructed and veneered with the 1 or 2 mm-thick ceromers. The fabricated FPDs were luted with resin cement on the resin dies and stored at room temperature for 72 hours. AE (acoustic emission) sensors were attached to both ends, the specimens were subjected to a compressive load until fracture at a crosshead speed of 0.5 mm/min. The AE and failure loads were recorded and analyzed statistically. Results. The results showed that the failure strength of the ceromer/FRC inlay FPDs was affected by the total thickness of the connectors rather than the ceromer to FRC ratio or the depth of the pulpal wall. Fracture was initiated from the interface and propagated into the ceromer layer regardless of the change in the ceromer / FRC ratio. Conclusion. Within the limitations of this study, the failure loads showed significant differences only in the case of different connector thicknesses, and no significant differences were found between the same connector thickness groups. The application of AE analysis method in a fiber-reinforced inlay FPD can be used to evaluate the fracture behavior and to analyze the precise fracture point.

A study on the machining accuracy of dental digital method focusing on dental inlay

  • Bae, Eun-Jeong;Jeong, Il-Do;Kim, Woong-Chul;Kim, Ji-Hwan
    • The Journal of Advanced Prosthodontics
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    • 제10권4호
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    • pp.321-327
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    • 2018
  • PURPOSE. The purpose of this study was to compare the cutting method and the lamination method to investigate whether the CAD data of the proposed inlay shape are machined correctly. MATERIALS AND METHODS. The Mesial-Occlusal shape of the inlay was modeled by changing the stereolithography (STL). Each group used SLS (metal powder) or SLA (photocurable resin) in the additive method, and wax or zirconia in the subtractive method (n=10 per group, total n=40). Three-dimensional (3D) analysis program (Geomagic Control X inspection software; 3D systems) was used for the alignment and analysis. The root mean square (RMS) in the 2D plane state was measured within $50{\mu}m$ radius of eight comparison measuring points (CMP). Differences were analyzed using one-way analysis of variance and post-hoc Tukey's test were used (${\alpha}=.05$). RESULTS. There was a significant difference in RMS only in SLA and SLS of 2D section (P<.05). In CMP mean, CMP 4 ($-5.3{\pm}46.7{\mu}m$) had a value closest to 0, while CMP 6 ($20.1{\pm}42.4{\mu}m$) and CMP 1 ($-89.2{\pm}61.4{\mu}m$) had the greatest positive value and the greatest negative value, respectively. CONCLUSION. Since the errors obtained from the study do not exceed the clinically acceptable values, the lamination method and the cutting method can be used clinically.

CAD/CAM 세라믹 인레이로 수복한 치아의 응력분포에 관한 유한요소법적 연구 (FINITE ELEMENT STRESS ANALYSIS OF A TOOTH RESTORED WITH CAD/CAM CERAMIC INLAY)

  • 송보경;엄정문
    • Restorative Dentistry and Endodontics
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    • 제26권6호
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    • pp.464-484
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    • 2001
  • When restoring a tooth, the dentist tries to choose the ideal material for existing situation. One criterion that is considered is its suitability for restoring coronal strength. As more tooth structure is removed, the cusps are weakened and susceptible to fracture. Further, this increased deformation may cause the formation of intermittent gaps at the margin between the hard tissue and the restoration, facilitating marginal leakage. The improvements in ceramic materials now make it possible for alternatives to amalgams, composites, and cast metal to be of offered for posterior teeth. Of the materials used, ceramics most closely approximates the properties of enamel. The introduction of computer-aided design/computer-aided manufacture(CAD/CAM) systems to restorative dentistry represents a major technological breakthrough. It is possible to design and fabricate ceramic restorations at a single appointment. Additionally, CAD/CAM systems eliminate certain errors and inaccuracies that are inherent to the indirect method and provide an esthetic restoration. The aim of this investigation was to study the loading characteristics of CAD/CAM ceramic inlay and to compare the stress distribution and displacement associated with different designs of cavity(the isthmus width and cavity depth). A human maxillary left first premolar was prepared with standard mesio-occlusal cavity preparation, as recommended by the manufacturer Ceramic inlay was fabricated with CEREC 2 CAD/CIM equipment and cemented into the prepared cavity. Three dimensional model was made by the serial photographic method. The cavity width was varied $\frac{1}{3}$, $\frac{1}{2}$ and $\frac{2}{3}$ of intercuspal distance between buccal and lingual cusp tip. The cavity depth was varied 1.5mm and 2.3mm. So six models were constructed to simulate six conditions. A point load of 500N was applied vertically onto the first node of the lingual slope from the buccal cusp tip. The stress distribution and displacement were solved using ANSYS finite element program(Swanson Analysis System). (omitted)

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