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doi:https://doi.org/10.5781/JWJ.2019.37.4.7    [Epub ahead of print]
A Study on the Bead Shape and Changing Material Properties Depending on the Welding Position in P-GMAW
Jin-Hyeong Park*, Sung-Hwan Kim*, Roh-Won Kim*, Hyeong-Soon Moon*, Myung-Hyun Kim**
*Precision Manufacturing & Control R&D Group, Korea Institute of Industrial Technology, Busan, 46742, Korea
**Dept. of Naval Architecture and Ocean Engineering, Pusan National University, Busan 46241, Korea
Correspondence: Hyeong-Soon Moon  Email: hsmoon@kitech.re.kr, kimm@pusan.ac.kr
Myung-Hyun Kim  Email: hsmoon@kitech.re.kr, kimm@pusan.ac.kr
Received May 19, 2019  Accepted June 25, 2019  Published online July 22, 2019
ABSTRACT
This study performed welding in different positions, in the flat, vertical down, overhead positions, using the P-GMAW process. Despite using the same amount of heat input, the welding characteristics varied depending on the welding position. The effect of gravity on the welding process determined the formation of the weld bead. The difference in molten pool behavior for various welding positions resulted in changes in the microstructure due to differences in cooling rates. To collect the welding parameters, the current and voltage signals were synchronized with a high speed camera using a DAQ system. To induce one droplet for one pulse of metal transfer, a shielding gas composite rate was used, 95%Ar+5%CO2. The results in the melting zone for different welding positions were compared, and the microstructure of the welded section related to molten pool behavior was analyzed.
Keywords: Welding position | Molten pool behavior | Cooling rate | Gravity
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