预热对690 MPa级HSLA钢对接接头力学性能的影响

汤忖江, 安同邦, 彭云, 马成勇, 林纯丞, 石照夏, 秦哲

Effect of Preheating on Microstructure and Mechanical Properties of Butt Joint of 690 MPa Grade HSLA Steel

TANG Cunjiang, AN Tongbang, PENG Yun, MA Chengyong, LIN Chuncheng, SHI Zhaoxia, QIN Zhe

图6 不预热和低预热对接接头焊缝金属、熔合区和粗晶热影响区微观组织的SEM像

Fig.6 SEM images of non-preheating and low preheating temperature butt joints (dashed lines indicate fusion zone regions, the same below) (a, b) weld metals, (c, d) fusion zones (circle indicates abnormal growth of acicular ferrite), (e, f) coarse grain regions in HAZ