Open AccessResearch on Microstructure and Performance of Welded Joint of High Strength Match
Author(s) -
Yan Wang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/585/1/012159
Subject(s) - welding , materials science , microstructure , joint (building) , toughness , composite material , metallurgy , heat affected zone , structural engineering , engineering
This paper studied the microstructure, hardness and impact property of the high match welded joint of Q235A steel. The experiment results showed the grain of the same feature region gradually tended to be coarsening under the approximately same welding speed when the welding current increased. Under the same welding current, the weld zone hardness was the highest, the normalized zone hardness was medium and the overheated zone hardness was lowest but the hardness of each zone was still higher than the hardness of the base metal. The sample impact toughness under 120A welding current was the highest. Under the experimental conditions, the best welding current for high matching welded joints was 120A. The comprehensive mechanical properties of low carbon steel welded joint were the best when the welding current was 120A.