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The characteristics of adhesive bonded joint of steels for automobile were investigated. Shear and tear strength were tested and analyzed for the joints of cold rolled steel sheets bonded with three kinds of epoxy and urethane based adhesive. The results showed that the tensile shear strength and the tear strength of adhesive joint were affected by the shape of adhesive joint such as the length and width of adhesive joint. The thickness of adhesive layer was very important factor affecting the bonding strength. The shear strength increased with decrease of the thickness of adhesive layer, while the tear strength decreased as the thickness of adhesive layer decreased. In comparison with the strength of spot welded joint, the shear strength of adhesive Joint was higher than that of spot welded joint, but the tear strength of adhesive Joint was lower than that of spot welded joint.
The sulfide stress cracking (SSC) resistance of API X65 grade steel weldment has been studied using SSC test in NACE TM-0177 method A and the applied load was 72-108 % of yield strength. The X65 grade pipe steel consisted of fine-grained ferrite and a small volume fraction of pearlite. To investigate the effect of welding process on microstructure and hardness distribution, the submerged arc welding (SAW) were performed with two electrodes. Multi pass SAW for both sides of plates was carried out with a heat input of about 59 kJ/cm -100 kJ/cm. The microstructure of SAW joint was composed with ferrite, pearlite and some M-A constituent. The low carbon thermo-mechanical control process (TMCP) type steel used for SAW showed softening behavior in the HAZ adjacent to base metal. The SSC testing revealed that the API X65 SAW low heat input weld was suitable for sour service, satisfying the NACE requirements. All the specimens failed during or after SSC tests showed that the crack was initiated and propagated along the intercritical heat affected zone (ICHAZ) region as a typical stress oriented hydrogen induced cracking (SOHIC) type. By suppressing softening in the ICHAZ region, the SSC resistance of low carbon TMCP steel welded joints could be more improved.
본 연구의 목적은 조직문화가 조직구성원의 직무만족에 미치는 영향과 조직문화와 직무만족 간의 관계에서 통제소 재의 조절효과를 살펴보는 것이다. 조직문화는 하위문화 중 혁신지향문화를 살펴보았으며, 조절효과를 위한 통제소재는 내 재론자와 외재론자로 나누어 살펴보았다. SAS 9.4와 PLS 3.0을 통해 기술통계 및 위계적 회귀분석을 실시하였으며, 몽골기 업의 여러 조직구성원들을 대상으로 분석하였다. 총 283부의 설문지가 실증분석에 이용되었으며 분석결과는 다음과 같다. 첫 번째, 혁신지향문화는 직무만족에 긍정적으로 영향을 미치는 것으로 나타났고 두 번째, 혁신지향문화와 직무만족 사이에 서 통제소재 중에서도 내재론자가 조절역할을 하는 것으로 나타났다. 따라서 본 연구결과를 통해 직무만족에 영향을 미치는 요인들(조직문화, 통제소재)을 이해함으로써 조직구성원을 관리하기 위한 도움을 얻을 수 있다. 이러한 실증 연구결과를 바 탕으로 시사점과 연구방향을 제시하였다. The purpose of this study is to verify the effect of organizational culture on job satisfaction and to explore the moderating effect of locus of control. The study examined adhocracy culture among organizational cultures and divided into internals and externals for moderating effect of locus of control. The data analysis was used to SAS Ver 9.4 and PLS Ver 3.0. The test was conducted by 283 employees working at large, small-medium company and public enterprise in Mongolia. The results indicate that the positive adhocracy culture and job satisfaction were statistically supported. And this study found that internals moderating roles in the relationship between adhocracy culture and job satisfaction. Based on the findings of this study, the study presented managerial implications and suggestions for future studies.
This study has evaluated the wear behavior of PTA (Plasma Transferred Arc) Inconel 625 and Stellite 6 overlays on Nimonic 80A substrate. Nimonic 80A alloy was also included for comparison. In order to evaluate the wear performance, three-body abrasive wear test and pin-on-disk dry sliding wear test were performed. Microstructural development during the solidification of deposits is also discussed. Wear test results show that the wear rate of Stellite 6 deposit is lower than that of Inconel 625 deposit and Nimonic 80A. The sliding wear resistance of overlay deposits follows a similar trend to the abrasive wear resistance, but for Nimonic 80A. The main wear mechanisms were abrasive wear for Inconel 625 deposit, adhesive wear and delamination for Stellite 6 deposit in pin-on-disk dry sliding wear test and ploughing in three-body abrasive wear test. Cross sectional examinations of the worn surface of pin specimens after pin-on-disk dry sliding wear test implies that the plastic deformation near worn surface has occurred during the wear testing.