Research on the Welding Process of 1 000 MPa Grade High Strength Steel Self-developed Solid Wire

LAN Jiuxiang; MA Qiang; XIAO Huiying; BA Peipei; BAI Yinghua; DONG Zehong

doi:10.7512/j.issn.1001-2303.2024.06.09

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Research on the Welding Process of 1 000 MPa Grade High Strength Steel Self-developed Solid Wire
Vol. 54, Issue 6, Pages: 53-59(2024)
Published： 25 June 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.06.09
稿件说明：

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兰久祥，马强，肖辉英，等.1000 MPa级高强钢国产自研实心焊丝焊接工艺研究［J］.电焊机，2024，54（6）：53-59.

LAN Jiuxiang, MA Qiang, XIAO Huiying, et al.Research on the Welding Process of 1 000 MPa Grade High Strength Steel Self-developed Solid Wire[J].Electric Welding Machine, 2024, 54(6): 53-59.
兰久祥，马强，肖辉英，等.1000 MPa级高强钢国产自研实心焊丝焊接工艺研究［J］.电焊机，2024，54（6）：53-59. DOI： 10.7512/j.issn.1001-2303.2024.06.09.

LAN Jiuxiang, MA Qiang, XIAO Huiying, et al.Research on the Welding Process of 1 000 MPa Grade High Strength Steel Self-developed Solid Wire[J].Electric Welding Machine, 2024, 54(6): 53-59. DOI： 10.7512/j.issn.1001-2303.2024.06.09.

摘要

针对国产自研的1 000 MPa级高强钢实心焊丝的熔化极气体保护焊工艺进行了系统性试验与分析。深入探讨了焊接电流和预热温度对接头微观组织、硬度分布以及力学性能的影响。研究发现，焊缝金属组织主要由马氏体构成，且随着焊接电流和预热温度的增加，贝氏体的含量相应增加；热影响区（HAZ）呈现出明显的硬化和软化趋势，细分为粗晶区、细晶区和不完全重结晶区；硬度在细晶区达到最高值，临界热影响区最低；在相同的预热温度下，随着焊接电流的增加，焊接接头的抗拉强度和冲击韧性呈现先增加后减少的趋势；而在相同的焊接电流下，抗拉强度和冲击韧性随预热温度变化的规律性不明显。当焊接电流为260 A，预热温度为100 ℃时，接头的力学性能最优，其抗拉强度高达1 088 MPa，-40 ℃时的冲击韧性达到47.8 J。

Abstract

This study conducted a systematic experimental and analytical investigation of the gas shielded welding process using domestically developed solid wire for 1000 MPa grade high-strength steel. Employing metallographic microscopy

scanning electron microscopy

microhardness testing

and room temperature tensile tests

the research delved into the effects of welding process parameters

including welding current and preheating temperature

on the microstructure

hardness distribution

and mechanical properties of the welded joints. The study found that the weld metal microstructure is primarily composed of martensite

with the content of bainite increasing as the welding current and the preheating temperature increases. The heat-affected zone (HAZ) of the welded joint exhibits distinct hardening and softening trends

divided into coarse grain areas

fine grain areas

and incompletely recrystallized areas. Hardness testing results indicate that the hardness is highest in the fine grain area of the HAZ and lowest in the critical heat-affected zone. Mechanical property analysis reveals that at the same preheating temperature

the tensile strength and impact toughness of the welded joint increase and then decrease as the welding current increases; while at the same welding current

the variation of tensile strength and impact toughness with different preheating temperatures is not significant. Notably

when the welding current is set to 260 A and the preheating temperature to 100 ℃

the welded joint exhibits the optimal comprehensive mechanical properties

with a tensile strength of up to 1 088 MPa and an impact toughness of 47.8 J at -40 °C.

关键词

高强钢焊丝焊接接头焊接工艺焊接热影响区力学性能

Keywords

high strength steel wirewelding jointwelding processwelding heat affected zonemechanical properties

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