Effect of Heat Input on Microstructure and Properties of X80 grade FCAW-G Welding Metal

WU Linen; LIU Yu; XIA Peipei; ZHANG Kefang; GU Yunlong; HE Jinkun

doi:10.7512/j.issn.1001-2303.2023.10.14

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Effect of Heat Input on Microstructure and Properties of X80 grade FCAW-G Welding Metal
Vol. 53, Issue 10, Pages: 90-96(2023)
DOI： 10.7512/j.issn.1001-2303.2023.10.14

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吴林恩，刘宇，夏培培，等.热输入对X80级气保护药芯焊丝焊缝金属组织性能的影响［J］.电焊机，2023，53（10）：90-96.

WU Linen, LIU Yu, XIA Peipei, et al.Effect of Heat Input on Microstructure and Properties of X80 grade FCAW-G Welding Metal[J].Electric Welding Machine, 2023, 53(10): 90-96.
吴林恩，刘宇，夏培培，等.热输入对X80级气保护药芯焊丝焊缝金属组织性能的影响［J］.电焊机，2023，53（10）：90-96. DOI： 10.7512/j.issn.1001-2303.2023.10.14.

WU Linen, LIU Yu, XIA Peipei, et al.Effect of Heat Input on Microstructure and Properties of X80 grade FCAW-G Welding Metal[J].Electric Welding Machine, 2023, 53(10): 90-96. DOI： 10.7512/j.issn.1001-2303.2023.10.14.

摘要

为了提高管道气保药芯焊丝自动焊（FCAW-G）环焊缝的性能，为现场焊接焊材选用和工艺参数制定提供指导，采用实际焊接试验、力学性能测试、显微组织分析等方法，对不同热输入下的X80管线钢气保药芯自动焊焊缝金属的强度、韧性分布规律及组织特征进行了研究。试验结果表明，热输入对X80气保护药芯焊丝焊缝金属显微组织及性能有显著的影响。X80气保药芯焊丝焊缝金属的组织构成主要由针状铁素体AF、多边形铁素体以及粒状贝氏体GB组成，随着热输入的增大，所有的晶粒尺寸有长大的趋势，且准多边形铁素体和多边形铁素体增多，针状铁素体减少；焊缝金属低温冲击韧性呈现先升后降的趋势，当热输入为1.2 kJ/mm时，达到最大值；在大热输入下，焊缝组织粗化，导致焊缝金属强度和断裂韧性降低。综合性能分析结果，当焊接热输入为1.2 kJ/mm时，X80气保药芯焊丝焊缝金属综合性能最佳。

Abstract

In order to improve the performance of FCAW-G pipeline girth weld and provide guidance for the selection of welding materials and process parameters,the effect of metallographic structure and properties under six welding heat inputs were systematically studied,combined with metallographic analysis, tensile test, impact test, CTOD fracture toughness etc.The test results show that the heat input have great influence on the metallographic structure and properties of weld metal.The microstructure of X80 FCAW-G weld metal consists predominantly polygonal ferrite, acicular ferrite(AF) and granular bainite.With the increasing of the heat input, the grains grow up and the acicular ferrite decreases；The low temperature toughness of weld metal increased with the increasing of heat input at first but when heat input reached 1.2 kJ/mm it decreased with the increasing of heat input. Under high heat input, the weld structure coarsened, which led to the decrease of the weld metal strength and fracture toughness.The X80 FCAW-G weld metal with good properties can be obtained with the heat input of 1.2 kJ/mm.

关键词

焊接热输入X80级气体保护焊药芯焊丝焊缝金属组织性能

Keywords

heat inputX80 grade Gas-shield flux cored wireweld metalmicrostructureproperties

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