• Journal of Welding and Joining
• /
• v.25 no.6
• /
• pp.84-95
• /
• 2007

The International System for Education and Qualification of Welding Personnel has been implemented based on the harmonized European System for education and qualification of welding personnel. This paper gives an overview of the International System focusing on the training guidelines and the quality assurance system developed. Systems for harmonization of Certification of Welding Personnel and for supporting companies using welding to implement ISO 3834 have been developed by EWF and are presently being transferred to IIW in line with the EWF/IIW agreement established in 2000.

• Journal of Welding and Joining
• /
• v.23 no.4
• /
• pp.27-33
• /
• 2005

Quantitative evaluation was performed on the microstructure of flux-cored arc(FCA) weld metal using a method blown as IIW scheme. It was mainly intended to figure out any practical difficulties in applying this method and also to provide the consumable makers with basic guide line in developing FCA welding consumables far better properties. Assessment of the experimental results showed IIW scheme was quite reliable in the low heat input range where the acicular ferrite was a major constituent. However, in the high heat input range, some scatter was noticed as the other phases like grain boundary ferrite and Widmansttaten ferrite become dominant. It implies that the accuracy of IIW scheme depends on the faction of microstructural constituents and it become worse as the fraction of latter two phases increases. This tendency was discussed in terms of the characteristics of those two phases. In addition, base line microstructure of rutile type FCA weld metal was addressed for developing new FCA welding consumables intended for higher heat input welding.

• Journal of the Society of Naval Architects of Korea
• /
• v.51 no.1
• /
• pp.26-33
• /
• 2014

In this study, Non-load-carrying EH Grade steels in fillet welded joints were evaluated with both the hot spot stress method and the 1mm stress method. The thickness effect criterion for fatigue strength evaluation of welded of welded steel structures recommendations of the IIW was used to evaluate the fatigue strength of EH40 and EH36 and Both EH40 and EH36 have been compared with FAT 125 curve recommended in the IIW. Furthermore, fatigue strength of the welded tow and the ground conditions for Non-load-carrying EH36 based on the 1mm stress method has been discussed.

• Proceedings of the KSME Conference
• /
• 2008.11a
• /
• pp.448-452
• /
• 2008

2-stroke marine diesel engine has generally one exhaust valve and three fuel injection nozzle which are key component for engine's performance and combustion. Fuel injection and exhaust valve driving system are driven by rotating of camshaft. Rotation of crank shaft drives the cam shaft through gear train that is composed of $3{\sim}4$ gear wheels. Gear column supporting the gear wheel has to bear against the dynamics forces by engine running as well as gearing forces. In this paper, structural analysis for engine structure and fatigue strength assessment of welded joint is shown. Repeatedly full cyclic simulation during one cycle is performed to investigate the structural behavior of engine. Fatigue analysis is carried out based on IIW using submodeling technique to obtain more detailed stress distribution.

• Proceedings of the KWS Conference
• /
• v.43
• /
• pp.208-210
• /
• 2004

국제용접학회(IIW) 및 대한용접학회(KWS)의 용접전문기술자 교육, 시험 및 검정에 대해서 기술한다. 그리고 현재까지 용접전문기술자 교육 및 검정과 관련되어 진행된 사업추진 실적에 대해서 기술하고, 이와 관련된 국내외의 환경 그리고 전망에 대해서 기술한다.

• Proceedings of the KWS Conference
• /
• 2005.06a
• /
• pp.121-123
• /
• 2005

국제용접학회(IIW) 및 대한용접학회(KWS)의 용접전문기술자 교육, 시험 및 검정에 대해서 기술한다. 그리고 현재까지 용접전문기술자 교육 및 검정과 관련되어 진행된 사업추진 실적에 대해서 기술하고, 이와 관련된 국내외의 환경 그리고 전망에 대해서 기술한다.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.2 no.4
• /
• pp.200-210
• /
• 2010

In this paper, different evaluation methods of Hot Spot Stresses (HSS) have been applied to four different welded structure details in order to compare them and to illustrate their differences. The HSSs at failure-critical locations were calculated by means of a series of finite element analyses. There was good overall agreement between calculated and experimentally determined HSS on the critical locations. While different methods and procedures exist for the computation of the structural hot-spot stress at welded joints, the recommendations within the International Institute of Welding (IIW) guideline concerning the 'Hot Spot Stress' approach were found to give good reference stress approximations for fatigue-loaded welded joints. This paper recommends and suggests an appropriate finite element modeling and hot spot stress evaluation technique based on round-robin stress analyses and experimental results of several welded structure details.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.20 no.5
• /
• pp.17-26
• /
• 2021

It is challenging to estimate the fatigue life of construction equipment consisting of a welded joint using field structure test owing to the uncertainty of the S-N curve. IIW recommends different S-N curves for various welded joint types. However, there is no way to define an appropriate curve considering complex design shape and strain gauge characteristics. This paper proposes an equivalent S-N curve method based on the relationship between IIW effective notch stress and virtual stress using finite element analysis. Moreover, a case study was conducted for the excavator fuel tank. The proposed method is expected to enhance accuracy and consistency in calculating the fatigue life for the welded structure of construction equipment.

• Proceedings of the KWS Conference
• /
• 1992.04a
• /
• pp.3-9
• /
• 1992

This paper introduces the present status of application of arc welding robots, construction, engineering subjects, design requirement, example of design modification for welding by arc welding robot. As a conclusion closer cooperation of robot engineer, welding engineer and structural designer is emphasised. This is the summary of the work done by Working Group for IIW Commission XV, chaired by the author.

• Computational Structural Engineering
• /
• v.10 no.3
• /
• pp.15-21
• /
• 1997

Modern ocean-going vessels are highly dynamically loaded all-welded structures. Traditionally, this fact has been taken into account in the design of ship structures by keeping the overall stress level within permissible limits and by limiting notch effects in the design of local structures. With an improving knowledge of loads and the rapid development of calculation means more detailed calculation-based methods are increasingly introduced. A brief review on fatigue assessment methods used in the design of ship structures has been given during the 1993 IIW International Conference in Glasgow. The rapid development during recent years underlines the importace of the subject and justifies its extended discussion in this paper.