Cross-sectional hardness of aluminum welds (spot welding)

Cross-sectional observation and hardness measurement of the weld joint were conducted! It was found that the void in the center is a blowhole.

We conducted hardness measurements on aluminum spot welds after performing cross-sectional observations and investigated the trends based on Vickers hardness, Young's modulus, and elasticity ratio. From X-ray radiographic observations, voids were confirmed inside the weld. Cross-sectional observations revealed that the central void was a blowhole. Additionally, the hardness measurement results indicated that the area near the blowhole was hard but had low stiffness and was prone to deformation, while areas slightly away from the blowhole exhibited higher stiffness and were somewhat brittle. [Summary] ■ Observation case of aluminum spot welds: optical microscope images, X-ray images - Voids confirmed inside the weld from X-ray radiographic observations ■ Hardness measurements of aluminum spot weld cross-sections - Measurements conducted centered around the blowhole - Investigation of trends based on Vickers hardness, Young's modulus, and elasticity ratio *For more details, please refer to the PDF document or feel free to contact us.

basic information

【Hardness Measurement Results】 ■ The area near the blowhole is hard but has low rigidity and is prone to deformation. ■ Areas slightly away from the blowhole have high rigidity and are somewhat brittle. ■ The area near the blowhole is hard and elastic, while the further away from the blowhole, the softer and less elastic it becomes. *For more details, please refer to the PDF document or feel free to contact us.