中国焊接(英文版)
中國銲接(英文版)
중국한접(영문판)
CHINA WELDING
2003年
2期
122-127
,共6页
张富巨%许卫刚%王玉涛%王燕%张学刚%廖永平
張富巨%許衛剛%王玉濤%王燕%張學剛%廖永平
장부거%허위강%왕옥도%왕연%장학강%료영평
heat input%heat-affected zone%ultra-fine grain steel%ultra narrow-gap welding
In this essay, we studied how heat input affected the microstructure, hardness, grain size and heat-affected zone(HAZ) dimension of WCX355 ultra-fine grain steel which was welded respectively by the ultra narrow-gap welding (UNGW) process and the overlaying process with CO2 as protective atmosphere and laser welding process. The experimental results show when the heat input changed from 1.65kJ/cm to 5.93kJ/cm, the width of its HAZ ranged from 0.6mm to 2.1mm.The average grain size grew up from 2～5μm of base metal to 20～70μm and found no obvious soften phenomenon in overheated zone. The width of normalized zone was generally wide as 2/3 as that of the whole HAZ, and the grain size in this zone is smaller than that in base metal. Under the circumstance of equal heat input, the HAZ width of UNGW is narrower than that of the laser welding.
