The Study about Characteristics of Welding Consumable and Weld Metal for EGW

Lee, Jeong-Soo; Yun, Jin-Oh; Jeong, Sanghoon; Park, Chul-Gyu; An, Young-Ho

doi:10.5781/kwjs.2010.28.2.079

Journal of the Korean Welding and Joining Society

2010

DOI: 10.5781/kwjs.2010.28.2.079

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The Study about Characteristics of Welding Consumable and Weld Metal for EGW

Jeong-Soo Lee¹,

Jin-Oh Yun²,

Sanghoon Jeong³

et al.

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Cited by 3 publications

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Effect of Welding Process on Microstructure and Impact Toughness of Welds in High Nitrogen TiN Steel

Kwon,

Jeong

2023

J Weld Join

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The effect of welding process on the microstructure and impact toughness of high-nitrogen TiN EH36-TM steels was evaluated. In the weld metals of SSAW and TSAW, GBF was created along PAGB, and AF and a small amount of PF were observed in the grain. In TSAW with low basicity and high heat input, GBF was remarkably developed, and intragranular AF was more coarse. In the EGW weld metal, GBF was hardly generated and composed of intragranular AF and PF. As the heat input increased, the size of PAGB was increased and PF was developed at the FL, and in FL+1, the grain size of AF and PF was coarsened. Meanwhile, the FL of EGW showed a similar size without grain size growth compared with FL+5. Among the three welding processes applied, weld metals of SSAW and EGW well met the values required by the classification for the EH36 steel, but the weld metal of TSAW was insufficient. HAZ of high-nitrogen TMCP steels satisfy the value required by the classifications without significant change even when welding at various input heat conditions, and in particular, the weld metal of the high heat-input EGW showed relatively stable values from FL to FL+5.

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Effect of Welding Process on Microstructure and Impact Toughness of Welds in High Nitrogen TiN Steel

Kwon,

Jeong

2023

J Weld Join

Self Cite

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Effects of Microstructures on the Toughness of High Heat Input EG Welded Joint of EH36-TM Steel

Choi¹,

Cho²,

Choi³

et al. 2012

Journal of the Korean Welding and Joining Society

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The characteristics of high heat input (342kJ/cm) EG (Electro Gas Arc) welded joint of EH36-TM steel has been investigated. The weld metal microstructure consisted of fine acicular ferrite (AF), a little volume of polygonal ferrite (PF) and grain boundary ferrite (GBF). Charpy impact test results of the weld metal and heat affected zone (HAZ) met the requirement of classification rule (Min. 34J at -20 ℃). In order to evaluate the relationship between the impact toughness property and the grain size of HAZ, the austenite grain size of HAZ was measured. The prior austenite grain size in Fusion line (F.L+0.1 mm) was about 350 ㎛. The grain size in F.L+1.5 mm was measured to be less than 30 ㎛ and this region was identified as being included in FGHAZ(Fine Grain HAZ). It is seen that as the austenite grain size decreases, the size of GBF, FSP (Ferrite Side Plate) become smaller and the impact toughness of HAZ increases. Therefore, the CGHAZ was considered to be area up to 1.3mm away from the fusion line.Results of TEM replica analysis for a welded joint implied that very small size (0.8~1.2㎛) oxygen inclusions played a role of forming fine acicular ferrite in the weld metal. A large amount of (Ti, Mn, Al)xOy oxygen inclusions dispersed, and oxides density was measured to be 4,600-5,300 (ea/mm2). During the welding thermal cycle, the area near a fusion line was reheated to temperature exceeding 1400℃. However, the nitrides and carbides were not completely dissolved near the fusion line because of rapid heating and cooling rate. Instead, they might grow during the cooling process. TiC precipitates of about 50 1 00nm size dispersed near the fusion line.

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Process Parameter Effect on Deformation of a V-groove Thin Plate for FCAW and EGW

Han¹,

Jeon²,

Park³

et al. 2013

Journal of the Korean Welding and Joining Society

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The Study about Characteristics of Welding Consumable and Weld Metal for EGW

Cited by 3 publications

References 3 publications

Effect of Welding Process on Microstructure and Impact Toughness of Welds in High Nitrogen TiN Steel

Effect of Welding Process on Microstructure and Impact Toughness of Welds in High Nitrogen TiN Steel

Effects of Microstructures on the Toughness of High Heat Input EG Welded Joint of EH36-TM Steel

Process Parameter Effect on Deformation of a V-groove Thin Plate for FCAW and EGW

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