Analysis and control of welding cracks for Q690D steel plate
闵凡启1,高立福1,卢爱凤1,王彦国1,郭丽波2,李国平2
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1. Yinshan Section Co., Ltd., Laiwu Steel Group, Laiwu 271104, China 2. Key Laboratory of Powder Metallurgy in Advanced Manufacturing of Laiwu, Laiwu Vocational and Technical College, Laiwu 271100, China
The cracks occurred for Q690D steel after welding. In view of this phenomenon, the chemical composition, metallographic structure, fracture morphology and inclusions in steel plate were observed and analyzed systematically by means of chemical analyzer, metallographic microscope and scanning electron microscope. The results showed that the chemical composition, metallographic structure and inclusions of materials could all meet the quality standard of products. The delayed brittle fracture was mainly caused by the nonstandard welding procedures. Therefore, the reasonable welding procedures were developed. The welding cracks could be effectively avoided by the measures such as preheating enhancement, slow cooling after welding, optimizing the welding parameters, multi-pass welding and hydrogen-eliminating treatment after welding.
MIN Fan-qi,GAO Li-fu,LU Ai-feng,WANG Yan-guo,GUO Li-bo,LI Guo-ping.
Analysis and control of welding cracks for Q690D steel plate[J]. Physics Examination and Testing, 2016, 34(1): 18-21 https://doi.org/10.13228/j.boyuan.issn1001-0777.20150105