Study on gas metal arc welding of two types of TMCP steels  

作　　者：HUANG Zhijun 

机构地区：[1]Research Institute,Baoshan Iron&Steel Co.,Ltd.,Wuhan 430080,China

出　　处：《Baosteel Technical Research》2023年第4期22-27,共6页宝钢技术研究（英文版）

摘　　要：Gas metal arc welding experiments were conducted on two types of steels with 0.41% carbon equivalent(Ceq) and 0.31% Cequsing WER70T wire and 20% CO_(2)and 80% Ar as shielding gas.The two types of steels show satisfactory weldability.The transition temperatures of 50% upper shelf energy(Tk0.5) for Charpy-V impact test of both the welded joints are below-40 ℃.However, the toughness of the fusion line zone and heat-affected zone(HAZ) of the two steel joints exhibits differences, with the toughness of 0.41% Ceqsteel being better than that of 0.31% Ceqsteel.The Tk0.5of the fusion line zone and the HAZ of 0.41% Ceqsteel is below-60℃,whereas that of 0.31% Ceqsteel is above-40℃.The welded joint of 0.41% Ceqsteel has low hardness fluctuation, while that of 0.31% Ceqsteel exhibits a narrow, softened zone, which has no obvious influence on the tested tensile strength.The coarse grain heat-affected zone(CGHAZ)microstructure of 0.41% Ceqsteel is bainite, while that of 0.31% Ceqsteel is bainite with ferrite and minor pearlite.

关 键 词：thermo-mechanically controlled processing(TMCP) COMPOSITION gas metal arc welding(GMAW) mechanical properties microstructure 

分 类 号：TG457.11[金属学及工艺—焊接]