Study on the Pulse MAG Welding Process and Joint Microstructure Properties of Large Container Support Frame ZQ460 High-Strength Steel

LUO Feng; WANG Yong; HE Chengxin

doi:10.7512/j.issn.1001-2303.2024.12.17

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Study on the Pulse MAG Welding Process and Joint Microstructure Properties of Large Container Support Frame ZQ460 High-Strength Steel
Vol. 54, Issue 12, Pages: 107-112(2024)
Received：17 June 2024，

Revised：2024-07-18，

Published：25 December 2024
DOI： 10.7512/j.issn.1001-2303.2024.12.17
稿件说明：

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罗锋，王勇，何成鑫.大型容器支承架ZQ460高强钢脉冲MAG焊工艺及接头组织性能研究［J］.电焊机，2024，54（12）：107-112. DOI： 10.7512/j.issn.1001-2303.2024.12.17.

LUO Feng, WANG Yong, HE Chengxin.Study on the Pulse MAG Welding Process and Joint Microstructure Properties of Large Container Support Frame ZQ460 High-Strength Steel[J].Electric Welding Machine, 2024, 54(12): 107-112. DOI： 10.7512/j.issn.1001-2303.2024.12.17.

摘要

针对大型容器轻量化发展和节能降本需求，选用ZQ460高强钢作为某大型容器支承架结构材料。通过分析ZQ460高强钢的可焊性，采用脉冲MAG焊工艺对其进行不同热输入条件下的焊接性试验，并分析热输入对接头微观组织、力学性能和抗裂性能的影响。结果表明，热输入与接头的微观组织与力学性能密切相关，随着热输入增加，焊缝区先共析铁素体比例逐渐增多，针状铁素体尺寸增大，侧板条状铁素体比例减少；热影响区组织特征为多个方向各异的马氏体板条簇集。焊接接头室温拉伸性能呈现下降趋势，但断在焊缝区，仍远高于母材技术要求；焊接接头的侧向弯曲性能在热输入为12~16 kJ/cm范围内，在弯曲角度为180°时没有裂纹产生。为了确保焊接接头的综合性能良好，建议将焊接热输入控制在12~16 kJ/cm以内。

Abstract

In response to the demands for lightweight development and energy-saving cost reduction of large containers

ZQ460 high-strength steel is selected as the structural material for the support frame of a certain large container. By analyzing the weldability of ZQ460 high-strength steel

a pulsed MAG welding process is adopted to conduct weldability tests under different heat input conditions

and the effects of heat input on the microstructure

mechanical properties

and crack resistance of the joint are analyzed. The results show that the heat input is closely related to the microstructure and mechanical properties of the joint. As the heat input increases

the proportion of pro-eutectoid ferrite in the weld zone gradually increases

the size of acicular ferrite grows

and the proportion of side plate strip ferrite decreases; the microstructural feature of the heat-affected zone is clusters of martensite plates in various directions. The room temperature tensile properties of the welded joints show a decreasing trend

but they break in the weld zone and are still far higher than the technical requirements of the base metal; the lateral bending performance of the welded joints

within a heat input range of 12~16 kJ/cm

does not produce cracks at a bending angle of 180°. In order to ensure good comprehensive properties of the welded joints

it is recommended to control the welding heat input within 12~16 kJ/cm.

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