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

• International Journal of Korean Welding Society
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• v.3 no.1
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• pp.57-62
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• 2003

The education examination and qualification systems around the world are now changing rapidly and unifying as one system. The Korean national system should be harmonious with this international tendency, in order to overcome the high degree of international economic competition. In this article, the current state of the international and national systems are critically compared and discussed with the intention of proposing improvements to the Korean national system. The Korean Welding Society has revamped its system so that its certificates might be recognized by the welding institutions in foreign countries such as the European Welding Federation (EWF) and still be recognized by the Korean Government. Their desire to join the system of International Institute of Welding (IIW).

• International Journal of Advanced Culture Technology
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• v.3 no.1
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• pp.169-178
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• 2015

This research aims to study the effects of various welding parameters in gas metal arc welding (GMAW) process on welding penetration, microstructure and hardness of AS3578-A350 high strength steel with the thickness of 10 mm. The welding process parameters were a welding current of 100-200A, an arc voltage of 20-30V, a welding speed of 20-60 cm/min and a gas shielding type of Ar and $Ar+CO_2$. The summarized experimental results are as follows. An increase of the welding current and voltage affected to increase the penetration depth of the joint. However, when the welding speed was decreased, it increased the penetration depth of the joint. Using the Ar gas for shielding the weld area, produced the higher penetration depth and the less narrow weld bead than the joint that was shielded by the mix gas of $Ar+CO_2$. The variation of the welding process parameters affected to produce the various microstructures of weld metal and heat affected zone and also showed the various kind of hardness along the weld joint.

• Proceedings of the KWS Conference
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• 2002.10a
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• pp.433-438
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• 2002

The education, examination and qualification systems around the world are now changing rapidly and unifying as one system. The Korean national system should be harmonious with this international tendency, in order to overcome the high degree of international economic competition. In this article, the current state of the international and national systems are critically compared and discussed with the intention of proposing improvements to the Korean national system. The Korean Welding Society has revamped its system so that its certificates might be recognized by the welding institutions in foreign countries such as the European Welding Federation (EWF) and still be recognized by the Korean Government. Their desire to join the system of International Institute of Welding (IIW) was also a factor in the restructuring.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2006.11a
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• pp.185-188
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• 2006

The sea water pipe of engine room in all kinds of ships is being surrounded with severe corrosive environment. Therefore it's leakage part due to corrosion is inevitably prevented by various welding method. In this case corrosion property of welded zone may be considerably different by each welding materials. In this study corrosion resistance of the welded zone of sea water pipe with some welding materials such as shielded metal arc welding materials, inert gas arc welding materials was investigated with electrochemical method.

• Journal of Welding and Joining
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• v.30 no.2
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• pp.5-10
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• 2012

• Journal of Welding and Joining
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• v.20 no.2
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• pp.4-12
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• 2002

• Proceedings of the KWS Conference
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• 2002.05a
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• pp.203-203
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• 2002

• Journal of Welding and Joining
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• v.20 no.2
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• pp.13-20
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• 2002

• Journal of Welding and Joining
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• v.30 no.5
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• pp.46-50
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• 2012

This study was carried out to investigate the effect of welding parameters such as shielding gas compositions welding voltage and welding current on the pore formation in the weld beads of galvanized steel pipes produced with gas metal arc welding. The porosity was evaluated and rated by metallography and radiographic test in terms of weight percentage, number and distribution of pores in weld beads. The porosity increased with increasing welding voltage and current, in which Ar gas produced the most porosity while $Ar+5%O_2$ generated the least porosity. It was found that the porosity could be reduced by selection of the proper gas mixture composition such as $Ar+5%O_2$ and $Ar+10%CO_2$ and by using current (130~150A) and voltage(16~20V).