Discussion on bending test method of welded joint based on 9Ni steel

MIN Xiaofeng; ZHAO Zonghe; BAI Xiaoliang; MO Zhilin

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Discussion on bending test method of welded joint based on 9Ni steel
Vol. 49, Issue 5, Pages: 104-107(2019)
Published：2019
DOI：
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DOI：

MIN Xiaofeng, ZHAO Zonghe, BAI Xiaoliang, et al. Discussion on bending test method of welded joint based on 9Ni steel[J]. Eletric Welding Machine2019, 49(5): 104-107. DOI：

摘要

为了验证9Ni钢焊接试件横向弯曲试验是否合格

采用焊条电弧焊对26mm厚9Ni钢板进行多层多道焊

使用维氏显微硬度计、万能试验机分析焊接接头力学性能及显微组织。结果表明

4件横向弯曲试样完好

热影响区组织为马氏体

晶粒容易长大。根据试验结果分析了横向弯曲热影响区容易出现裂纹的原因及防治方法

对船级社焊工取证考试规范的实施具有一定的指导意义。

Abstract

In order to verify the qualification of the transverse bending test of 9 Ni steel welding specimen

SMAW is adopted for multilayer and multi-pass welding of 26 mm thick 9 Ni steel. The microstructures and mechanical properties of welded joints are analyzed by Vickers microhardness tester and universal tester. The results show that there are four good transverse bending test specimens

the microstructures of HAZ are martensite and grains are easy to grow. According to the results

the causes and prevention methods of cracks in the transverse bending HAZ are analyzed

which has certain guiding significance to the implementation of welder certification examination standard in classification society.