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A Study of Characteristics on the Dissimilar Metals (ASTM Type 316L - Carbon Steel : ASTM A516-70) Welds Made with FCA Multiple Layer Welding
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  • Journal title : Journal of Welding and Joining
  • Volume 34, Issue 3,  2016, pp.69-76
  • Publisher : The Korean Welding and Joining Society
  • DOI : 10.5781/JWJ.2016.34.3.69
 Title & Authors
A Study of Characteristics on the Dissimilar Metals (ASTM Type 316L - Carbon Steel : ASTM A516-70) Welds Made with FCA Multiple Layer Welding
Kim, Se Cheol; Hyun, Jun Hyeok; Shin, Tae Woo; Koh, Jin Hyun;
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Characteristics of dissimilar metal welds between ASTM Type 316L and carbon steel ASTM A516 Gr.70 made with FCAW were evaluated in terms of microstructure, ferrite content, EDS analysis, hardness, tensile strength, impact toughness and corrosion resistance. Three heat inputs of 10.4, 16.9, 23.4kJ/cm were employed to make joints of dissimilar metals with E309LMoT1-1 wire. Microstructure of dissimilar weld metals consisted of mostly vermicular type of -ferrite and some lathy type of -ferrite, and -ferrite was transformed into globular type in reheated zone. In all conditions, weld metals were solidified on FA solidification mode. Based on the EDS analysis of weld metals, All Creq/Nieq values were in the range of FA solidification mode, and it was decreased with increasing heat inputs whereas it was increased with increasing layers. The amount of -ferrite was decreased with increasing heat input due to the difference of cooling rate, and it was increased with increasing layers. Accordingly, hardness and tensile strength of dissimilar metals weld joints was decreased with increasing heat input while impact energy was increased with increasing heat input. Corrosion test of dissimilar metals weld joints showed that weight gain rate of heat input 10.4kJ/cm was the greatest, and that of three heat inputs became constant after certain time.
Dissimilar metals welding;FCAW;A516-70;316L;-ferrite;
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