• Journal of Welding and Joining
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• v.1 no.2
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• pp.12-20
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• 1983

이 글에서는 다음의 내용을 다루었다. 1. 스테인레스 클래드강 2. 스테인레스 클래드강의 용접 및 절단 3. 용접 시공 4. 스테인레스 클래드강의 용접 시공 예

• Journal of Welding and Joining
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• v.2 no.2
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• pp.13-21
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• 1984

Chemical tanker의 Crago tank는 화학제품에 대한 내식성, 내산성 등이 요구되는 재료로서 스테인레스강이나, 스테인레스 클래드강이 주로 사용되고 있다. 이러한 스테인레스강을 사용한다 하더라도 사용시 국부적인 결함 및 부식의 문제점이 발생되고 있다. 특히 스테인레스 클래드강을 사용했을 경우 부식 및 기타 요인에 의해 결함이 발생했을 때, 클래드재(앞대기재)의 두께가 약 2.5mm 정도에 불과하므로 보수작업이 어려우며, 보수작업에 의한 산화피막의 파괴는 부식을 촉진시킨다. 이들 결함 및 부식 발생의 여러요인 중 특히 용접 시공상의 문제점이 가장 크게 영향을 미친다. 또한 용접 시공상의 문제점 중 스팻터를 제거하기 위해서는 많은 공수가 소모될 뿐 아니라 품질면에서도 나쁜 영향을 주고 있다. 본 고에서는 스팻터 생성기구의 검토와 스팻터가 모제에 미치는 영향을 다루고자 한다. 또한 용접조건 및 용접재료의 변화에 의한 스팻터 생성량 변화, 입도에 따른 비행거리 등을 검토하는데 목적을 두었다.

• Journal of Welding and Joining
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• v.8 no.2
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• pp.70-79
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• 1990

Stainless clad steels were made through hot rolling process. Backing plates employed in this study were HSLA steel and mild steel. The shear bond strength increased with an increase of the soaking temperature and time. It was also found that the shear bond strength increased with an increase of the reduction ratio. The threshold deformation was observed to be 20% and 10% respectively when the soaking conditions of 15 min. at 900.deg. C and 30 min. at 1000.deg. C were applied. Either the rolling or the transverse direction did not give any significant difference in the shear bond strength. Stainless steel-HSLA steel was superior to stainless steel-mild steel in the same range of magnitude. Because the above experimental results were in contrary to the existing mechanisms, the new model was proposed to describe the bonding mechanism and the void formation.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.4
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• pp.532-540
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• 2012

In this study, some considerations have been suggested in developing on-site techniques to evaluate the sensitization of stainless steels. Electrochemical potentiokinetic reactivation (EPR) technique is known to be a candidate tool for field applications since it enables quantitative assessment in reasonable test time, compared to oxalic etching (ditch) technique. The on-site application of the test method imposes additional restrictions on the selection of the test method (for example, minimum surface preparation requirement, insensitivity to testing temperature, etc.). The EPR and etching techniques have been compared in order to sensitization of stainless steel structures. It has been widely reported that the maximum sensitivity in the welded structure of stainless steel is shown at heat-affected zone (HAZ) than weldments with cast structure. In this work, sectioned weldments and external surfaces were investigated to reveal the degree of sensitization by the etching and the results were compared with those of EPR test. The EPR test showed little sensitivity to surface roughness and test temperature.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2003.04a
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• pp.340-345
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• 2003

By the use of a similar numerical method as that in the previous paper, the forming limit strain by coating method of clad sheet metals is investigated, in which the FEM is applied and J2G(J2-Gotoh's corner theory) is utilized as the plasticity constitutive equation. Clad two-layer sheets and sheets bonded with dissimilar sheets on both surface planes are stretched in a plane-strain state, with various work-hardening exponent n-values and thicknesses of each layer. Processes of shear-band formation in such composite sheets are clearly illustrated. It is concluded that, in the clad state, the higher limiting strain of one layer is reduced due to the lower limiting strain of the other layer and vice versa, and does not necessarily obey the rule of linear combination of the limiting strain of each layer weighted according thickness.

• Journal of Welding and Joining
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• v.33 no.5
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• pp.20-25
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• 2015

Clad steel has good corrosion resistance and mechanical properties arising from the hot rolling of dissimilar metals, such as carbon steel and stainless steel. However both good corrosion resistance from the cladding plate material(stainless steel) and mechanical properties from the base plate material (carbon steel) are difficult to obtain because the different steels display opposite behaviors during the cladding process. In order to make clad steel for application in the hulls of ships, proper materials selection and heat-treatment conditions are necessary. In this study, mechanical properties of base plate materials with different chemical composition were evaluated according to heat condition of cladding plate material.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.04a
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• pp.575-576
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• 2014

• Proceedings of the IEEK Conference
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• 2000.11b
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• pp.253-256
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• 2000

We report the experimental results for the coupling properties of the an side-polished single-mode fiber covered with metal-clad planar waveguide. The experimental results show that the large birefringence of a metal-clad planar waveguide facilitates the effective separation of TE and TM polarization in the spectral domain. Additionally the resonant wavelengths of the device are tuned based in the thermo-optic effect of polymer planar waveguide.

• Journal of Welding and Joining
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• v.13 no.2
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• pp.139-149
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• 1995

Many pressure vessels for the power plants are fabricated from low alloy ferritic steels. The inner sides of the pressure vessels are commonly weld_cladded with austenitic stainless steels to minimize problems of corrosive attack. The submerged-arc welding(SAW) process is now used in preference to other processes because of the possibilities open to automation to reduce the overaII welding times. The most reliable way to avoid underclad cracks(UCC) which are often detected at the overlap of the clad beads is to use nonsusceptible steels such as SA508 class 3. At present domestically developed forging steel of SA508 cl.S is now being cladded with single layer by using 90mm wide strip, which transfers higher heat input into the base metal compared to the conventional two layers strip cladding which has been in wide use with 30-60 mm wide strip. But the current indices for the influence of heat input on crack susceptibility are not accurate enough to express the subtle difference in crack susceptibility of the steel. Therefore, the purpose of this present study is: l) To determine UCC susceptibility on domestic forging steel, SA508 cl.S cladded with single layer by using submerged arc 90mm strip and, 2) To optimize heat input range by which the crack susceptibility could be eliminated.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.4
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• pp.53-59
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• 2000

Based on the polarization selectivity of fiber-to-planar waveguide coupler, a novel fiber optic polarizer has been designed and fabricated. The large structural birefringence of a metal-clad planar waveguide enables the polarizer to have wide operating wavelength range. The polymer and gold were used for the guiding layer and cladding layer of the planar waveguide, respectively. The experimental results showed that either TE or TM polarized lightwave could be created by adjusting the thickness of planar waveguide. Operating wavelegth range satisfying more than 16㏈ polarization extinction ratio was 130nm. The average insertion loss of fabricated devices was order of 0.5㏈.