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Journal of KWJS 2010;28(2):54-59.
Published online May 13, 2010.
FCAW에서 용접금속 확산성수소량에 미치는 용접변수 영향의 정량적 해석
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Quantitative Analysis on the Effects of Welding Parameters on Diffusible Hydrogen Contents in Weld Metal Produced by FCAW Process
Dong-Woo Han, Kook-Soo Bang, Hong-Chul Jeong, Jong-Bong Lee
Abstract
  The effects of welding parameters such as contact tip-to-work distance (CTWD), voltage, and current on the weld metal diffusible hydrogen contents (HD) were investigated and rationalized by the calculation of heating time and amount of heat generated in the extension length of flux cored wire. As CTWD increased from 15 to 25㎜, HD decreased from 8.46 to 5.45mL/100g deposited metal. Calculations showed that, with an increase of CTWD, the amount of heat generated increased from 46 to 92J in addition to an increase of heating time. Increase of current from 250 to 320A, however, gave little variation of HD. It showed that no significant change in the amount of heat generated was found, and heating time was decreased with an increase of current. It also showed that CTWD is more influential than voltage in relatively lower heat input ranges, while voltage is more in higher input ranges
Key Words: Diffusible hydrogen content, Welding parameters, CTWD, Current, FCAW
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