Materials Reports  2019, Vol. 33 Issue (Z2): 424-427 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of High Heat Input on Mechanical Properties of Low Alloy Steelby Electrode Arc Welding |
| YANG Lin, XIONG Jiankun, YU Yong, WEN Zhongbo, NIE Fuheng, YANG Dong, WANG Dongli, FENG Yulai
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| Dongfang Turbine Co., Ltd, Dongfang Electric Corporation,Deyang 618000 |
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Abstract In this paper, the structure and comprehensive properties of ZG15Cr1Mo1V low alloy steel joints welded by E9015-B3 under high heat input were studied. The results show that the changes of heat input has a certain effect on the welded joint. The high temperature duration increased and the cooling rate decreased when the heat input were elevated,the main strengthening elements, such as Cr and Mo, were decreased,ob-vious massive ferrite and coarse bainite structure appeared in the welded seam, which reduced the normal and high temperature strength of the joint. When the vertical upward welding swing is 30—50 mm, the point heat source has the greatest influence on the high temperature duration of the specified position, and the comprehensive mechanical properties of the weld seam are the worst at this time. In order to ensure the quality of welded joints, it is necessary to control the heat input to a certain extent, especially to choose a smaller welding current in the 30—50 mm welding swing stage.
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Published: 25 November 2019
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| Fund:This work was supported by Deyang Science and Technology Plan Project (2018CKJ004). |
| About author:: Lin Yang, male, born in 1986, master degree, principally engage in welding and performance evaluation for heat resistant steels used in steam turbine. Published 4 papers. |
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1 李小宝,张宇,潘鑫.钢铁研究学报,2013,25(9),52.
2 王元良,陈辉.焊接科学与工程,西南交通大学出版社,2008.
3 蒋庆磊.800 MPa高强钢GMAW接头组织性能及精细结构研究.博士学位论文,山东大学,2011.
4 马成勇,田志凌,杜则裕,等.焊接学报,2004,25(2),23.
5 孙占,黄继华,张华,等.焊接学报,2008,29(3),41.
6 余庆波,孙莹.机械工程学报,2009,45(12),284. |
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