Effect of Process Parameters on Hot Cracking During Laser Fillet Welding of AA6061-T6

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-02-17 DOI:10.1007/s12540-025-01908-9

Km Rakhi, Joonghan Shin

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Abstract

Hot cracking during laser welding of the aluminum alloy (AA) 6061-T6 adversely impacts the structural integrity and performance of welded joints. This study examined the effects of the beam inclination angle and welding speed on hot cracking during laser fillet welding of AA6061-T6 sheet lap joints. The welds were subjected to morphological and microstructural analyses, and their chemical compositions were determined. Good welds (without defects such as hot cracks and voids) were achieved using a beam inclination angle of 15°, moderate to high welding speeds (20–40 mm/s), and a constant laser power of 1500 W. Microstructural analysis revealed that fine grain structures and small grain misorientation angles were associated with fewer hot cracks. Additionally, hot cracks exhibited a considerably higher silicon concentration (3.92%) than other regions. Microcracks and voids were subjected to microcomputed tomographic analysis. The small beam inclination angle (15°) reduced the amount of microvoids. These results demonstrate how hot cracking of AA6061-T6 fillet lap joints can be avoided.

Graphical Abstract

Abstract Image

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工艺参数对AA6061-T6激光角焊热裂的影响

铝合金（AA） 6061-T6激光焊接过程中的热裂纹对焊接接头的结构完整性和性能产生不利影响。研究了光束倾角和焊接速度对AA6061-T6板材搭接激光角焊热裂的影响。对焊缝进行了形貌和显微组织分析，并测定了其化学成分。在光束倾角为15°、中高焊接速度（20-40 mm/s）和恒定激光功率为1500 W的情况下，获得了良好的焊缝（没有热裂纹和空洞等缺陷）。显微组织分析表明，细小的晶粒组织和较小的晶粒取向角与较少的热裂纹有关。此外，热裂纹的硅浓度（3.92%）明显高于其他区域。微裂纹和空洞进行了显微计算机层析分析。小的光束倾角（15°）减少了微孔的数量。结果表明，AA6061-T6圆角搭接接头的热裂是可以避免的。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.