利用数字图像相关技术对激光焊接连接的 AA6061-T6 铝合金的机械性能进行实验研究

IF 2.9 3区 工程技术 Q2 AUTOMATION & CONTROL SYSTEMS International Journal of Advanced Manufacturing Technology Pub Date : 2024-03-26 DOI:10.1007/s00170-024-13488-w
Jie Sheng, Fanrong Kong, Wei Tong
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引用次数: 0

摘要

在铝合金激光焊接的工业应用中,如何找到最佳工艺参数以生产出优质焊点往往是一项挑战。本研究探讨了焊接参数变化对激光焊接铝合金接头焊接缺陷和拉伸性能的影响。使用高功率盘式激光器焊接 2.54 毫米厚的 AA6061-T6 板材,并设置了四套不同的工艺参数。首先使用 X 射线计算显微层析成像和全场显微硬度绘图来表征焊接接头。基于数字图像相关和双镜光学装置的表面应变绘图被用于焊接接头的拉伸测试,直至韧性破坏。结果发现,所有四个激光焊接接头的熔合区都具有相似的显微硬度水平和空间分布。除了一个焊点有几个大气孔外,其他四个焊点都检测到了小气孔。研究发现,微观结构异质性和表面几何不规则性会导致激光焊接接头产生高度不均匀的局部拉伸变形。确定了一组激光焊接参数,以产生具有最佳拉伸性能的铝焊缝,即使其焊点可能含有几个相对较大的气孔。
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Experimental investigations on mechanical properties of AA6061-T6 aluminum alloy joined by laser welding using digital image correlation

In industrial applications of laser welding of aluminum alloys, it is often a challenge to find optimal process parameters to produce welded joints of good quality. This study investigates the effect of changes in welding parameters on the resulting welding defects and tensile properties of laser-welded aluminum alloy joints. A high-power disk laser was used for welding 2.54 mm thick AA6061-T6 sheets with four different sets of process parameters. X-ray computed microtomography and full-field microhardness mapping were first used to characterize the as-welded joints. Surface strain mapping based on digital image correlation and a two-mirror optical setup was applied to tensile testing of welded joints up to ductile failure. It was found that the fusion zone of all four laser-welded joints has similar microhardness levels and spatial distributions. Small pores were detected in all four weld joints, except one had a few large pores. Both microstructural heterogeneities and surface geometric irregularities were found to induce highly non-uniform local tensile deformation in laser-welded joints. One set of laser welding parameters was identified to produce the aluminum welds with the best tensile properties even though its weld joint may contain a few relatively large pores.

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来源期刊
CiteScore
5.70
自引率
17.60%
发文量
2008
审稿时长
62 days
期刊介绍: The International Journal of Advanced Manufacturing Technology bridges the gap between pure research journals and the more practical publications on advanced manufacturing and systems. It therefore provides an outstanding forum for papers covering applications-based research topics relevant to manufacturing processes, machines and process integration.
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