Real-time detection method for spot welding nugget diameter

Abstract

The real-time dot welding molten kernel detecting method includes the following steps: performing several point welding with welded sample in the same thickness as the welded part, and measurement and calculation to obtain the dynamic resistance curve of each point; further obtaining the quasi-stable state resistances rD of each point; splitting the welded sample along the joint surface, measuring the molten kernel diameter dK of each welded point, and drawing the rD vs dK curve; storing rD vs dK curves of different material thickness in computer system; and comparing the practical molten kernel diameter with the set standard value to judge welding quality.

Description

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AI Technical Summary

Benefits of technology

This technology allows for accurate detection of small particles on metal surfaces during laser beam melting (LBF). By measuring their size accurately, this helps improve the accuracy with which they are used in manufacture processes such as LFW process.

Problems solved by technology

In order to improve the accuracy and efficiency of spot winding processes, researchers have developed various techniques based upon different physical properties associated with resistivity changes over time. These include static resistance curves and molten pool sizes obtained from experiments conducted under specific conditions. Additionally, they found that certain metals like stainable steels may exhibit similar behavior patterns even if their chemical composition remains constant throughout the experimentation period.

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