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<p>The 7075 aluminum alloy clamp arm of a welding machine in a facility was broken during use. The failure analysis of the clamp arm was performed by chemical composition analysis, macroscopic and microscopic morphology observations of fracture surfaces, x-ray diffraction (XRD) analysis, and microstructure analysis. The results indicate that the elongated grain structure within the aluminum alloy induces anisotropy, significantly reducing the fatigue strength of the clamp arm. During the welding process, the clamp arm was subjected to alternating tensile–compressive stresses perpendicular to the elongated&#xa0;grain orientation, leading to premature fracture failure. The fracture surface exhibits abundant fatigue striations, indicating fatigue fracture as the dominant failure mechanism.</p>

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Fracture Cause Analysis of 7075 Aluminum Alloy Clamp Arm of Welding Machine

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Lan Wang

摘要

The 7075 aluminum alloy clamp arm of a welding machine in a facility was broken during use. The failure analysis of the clamp arm was performed by chemical composition analysis, macroscopic and microscopic morphology observations of fracture surfaces, x-ray diffraction (XRD) analysis, and microstructure analysis. The results indicate that the elongated grain structure within the aluminum alloy induces anisotropy, significantly reducing the fatigue strength of the clamp arm. During the welding process, the clamp arm was subjected to alternating tensile–compressive stresses perpendicular to the elongated grain orientation, leading to premature fracture failure. The fracture surface exhibits abundant fatigue striations, indicating fatigue fracture as the dominant failure mechanism.