Effects of Preheating and Heat Preservation on Microstructure and Properties of Fully Automatic External Welding Seams of X80 Steel Pipes in Severe Cold Environment

被引：0

作者：

Wang H. ^{[1
]}

Dong S. ^{[1
]}

Qian J. ^{[1
]}

Tang K. ^{[1
]}

Wang Z. ^{[1
]}

Qin X. ^{[2
]}

Lei Z. ^{[2
]}

机构：

[1] Jiangsu Oilfield Engineering & Construction Company Limited, Sinopec, Yangzhou

[2] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin

来源：

Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2021年 / 32卷 / 06期

关键词：

Mechanics property; Microstructure; Preheating and heat preservation; Severe cold environment; X80; steel;

D O I：

10.3969/j.issn.1004-132X.2021.06.016

中图分类号：

学科分类号：

摘要：

X80 pipeline steel arc welded was studied with different preheating and heat preservation measures in -30℃ severe cold environment. The microstructure characteristics of each region of the joints were observed under different welding conditions. The mechanics properties of the joints were characterized by hardness tests, tensile tests and low temperature impact tests. The results show that the welding seams of X80 steel welded are mainly columnar crystal in severe cold environment, and the filling areas are mainly composed of acicular ferrite, proeutectoid ferrite and a small amount of Widmanstatten structure. With the increasing of preheating and holding temperature, the size and quantity of Widmanstatten structure decrease. The maximum and minimum values of joint hardness appear in the coarse-grained areas and the incomplete recrystallization areas respectively. With the increasing of preheating and holding temperature, the overall hardness of the joints decreases, the low-temperature impact toughness of the weld areas increases, and the tensile strength increases first and then decreases. Preheating and heat preservation are effective measures to obtain joints with good comprehensive performance in severe cold environment. The joint performance is the best when preheating and holding temperature is as 100℃. © 2021, China Mechanical Engineering Magazine Office. All right reserved.

引用

页码：748 / 755

页数：7

共 20 条

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