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摘要
A synchronous measurement system for the laser welding process was designed to investigate welding imperfections. The system used multiple advanced sensing technologies, including photodiode analysis, spectrometry, visible imaging, illumination imaging and X-ray imaging. Sixteen optical and physical features of laser welding were quantified. A comprehensive analysis was conducted on the imperfection features during disk laser welding. When a laser beam is irradiated on the front-wall of the keyhole, it provides a stable vapor pressure and leads to sound welding. The balance is broken and causes imperfections if the irradiated energy, area or position changes. Humping imperfection appears when the irradiated energy on the keyhole front-wall increases. When humping occurs, the correlation between visible light radiation and exterior physical parameters such as keyhole, plume, etc. increases. Therefore, the integration of the visible-light-sensing photodiode and the visual sensor can be used to effectively detect humping. Underfill imperfection appears when the irradiated area on the keyhole front-wall narrows. When underfill occurs, laser reflection becomes stronger and the spatter number increases. The combination of reflected laser sensing photodiode analysis and visible imaging is considered more suitable for the recognition of underfill. Blowout imperfection occurs when a laser beam is irradiated on both key-hole front-wall and back-wall. The efficient method to detect blowout is visual sensing, including visible imaging and illumination imaging, because the molten pool is notably unstable when blowout occurs, and the spatter is relatively large.
- 出版日期2015-5
- 单位广东工业大学
