Abstract This paper presents both experimental and analytical investigations into weld root cracking behaviors in load-carrying high-strength aluminum alloy cruciform joints. In test specimen preparations, electric spark machining was used to ensure weld penetration consistency. An analytical weld throat stress model is proposed for determining the maximum opening stress state and its weld throat angle. Its lower-order form expressed in terms of nominal stress is also proven to be adequate for interpreting the test data, which offers simplicity for practical applications. Comparisons between the lower-order weld throat stress and “engineering shear stress” used in some Codes and Standards are also discussed.

中文翻译：

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承载高强铝合金十字接头焊缝根部疲劳裂纹分析

摘要 本文介绍了承载高强度铝合金十字形接头焊缝根部开裂行为的实验和分析研究。在试样制备中，使用电火花加工来确保焊缝熔深的一致性。提出了一种解析焊喉应力模型来确定最大张开应力状态及其焊喉角。其以名义应力表示的低阶形式也被证明足以解释测试数据，这为实际应用提供了简单性。还讨论了一些规范和标准中使用的低阶焊喉应力和“工程剪应力”之间的比较。