中国机械工程 ›› 2021, Vol. 32 ›› Issue (06): 748-755.DOI: 10.3969/j.issn.1004-132X.2021.06.016

• 工程前沿 • 上一篇    下一篇

预热及保温对严寒环境X80钢管道全自动外焊焊缝组织与性能的影响

汪宏辉1;董淑磊1;钱建康1;汤克刚1;王志航1;秦熙琨2;雷正龙2   

  1. 1. 中石化江苏油建工程有限公司,扬州, 225009
    2. 哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨,150001
  • 出版日期:2021-03-25 发布日期:2021-04-01
  • 通讯作者: 雷正龙(通信作者),男,1977年生,副教授、博士研究生导师。研究方向为激光-电弧复合焊接基础与应用、激光焊接质量检测与控制、特种材料激光焊接。E-mail: leizhenglong@hit.edu.cn。
  • 作者简介:汪宏辉,男,1974年生,高级工程师。研究方向为国内外长输管道/场站储罐(油、气、水)焊接工艺设计。发表论文5篇。E-mail:adr400@vip.163.com。

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

WANG Honghui1;DONG Shulei1;QIAN Jiankang1;TANG Kegang1;WANG Zhihang1;QIN Xikun2;LEI Zhenglong2   

  1. 1. Jiangsu Oilfield Engineering & Construction Company Limited, Sinopec, Yangzhou, Jiangsu,225009
    2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001
  • Online:2021-03-25 Published:2021-04-01

摘要: 研究了-30 ℃严寒环境下采用不同预热及保温措施进行电弧焊接的X80钢,观察了不同焊接条件下接头各区域的显微组织特点,通过硬度测试、拉伸试验、低温冲击试验对接头的力学性能进行了表征。研究结果表明:严寒环境下焊接得到的X80钢焊缝以柱状晶为主,填充区主要由针状铁素体、先共析铁素体及少量魏氏组织组成,随着预热及保温温度升高,魏氏组织的尺寸和数量都有所减小;接头硬度的极大值与极小值分别出现在热影响区的粗晶区与不完全重结晶区,随着预热及保温温度的升高,接头的整体硬度降低,焊缝区域的低温冲击韧性增强,而抗拉强度先提高后降低;预热及保温是接头在严寒环境下获得具有良好综合性能的有效措施,预热及保温温度为100 ℃时接头性能最优。

关键词: 严寒环境, X80钢, 预热及保温, 显微组织, 力学性能

Abstract: 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 ℃.

Key words: severe cold environment, X80 steel, preheating and heat preservation, microstructure, mechanics property

中图分类号: