Study on microstructure and properties of deposited metal of X80 high-grade pipeline steel welding wire under different welding currents

LAI Shiqiang; WANG Gaojian

doi:10.7512/j.issn.1001-2303.2020.10.25

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Study on microstructure and properties of deposited metal of X80 high-grade pipeline steel welding wire under different welding currents
Vol. 50, Issue 10, Pages: 121-124(2020)
DOI： 10.7512/j.issn.1001-2303.2020.10.25

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LAI Shiqiang, WANG Gaojian. Study on microstructure and properties of deposited metal of X80 high-grade pipeline steel welding wire under different welding currents. [J]. 50(10):121-124(2020)
DOI：

LAI Shiqiang, WANG Gaojian. Study on microstructure and properties of deposited metal of X80 high-grade pipeline steel welding wire under different welding currents. [J]. 50(10):121-124(2020) DOI： 10.7512/j.issn.1001-2303.2020.10.25.

摘要

研究了焊接电流对高等级X80专用高效气体保护焊丝熔敷金属的力学性能和组织的影响,为自动焊在高寒地区管道工程中的应用及焊接工艺选择提供基础。结果表明:在150～250 A焊接电流下X80管线钢焊丝(1.0)熔敷金属均具有较好的强韧性;随着焊接电流的增加,焊缝冲击韧性有所降低,焊接电流每提高10 A,-30℃及-50℃冲击功下降4～5 J;焊缝组织以细小铁素体为主,赋予材料优良的强韧特性。

Abstract

The effect of welding current on the mechanical properties and microstructure of deposited metal of high-grade X80 high-efficiency gas shielded welding wire is studied,which provides a basis for automatic welding of pipeline engineering and welding process selection in alpine regions. The results show that under the welding current of 150～250 A,the deposited metal of X80 pipeline steel welding wire（1.0） has good strength and toughness;as the welding current increases,the impact toughness of the weld decreases. For every 10 A increase in welding current,the impact energy at -30 ℃ and -50 ℃ decrease 4 ～5 J,the microstructure of the weld is mainly composed of fine ferrite,which gives the material excellent toughness characteristics.