알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교 = Comparison of Weldability and Microstructure in Resistance Spot Welding of Aluminum 5052-H32 Alloy and Al 6014-T4 Alloy

다국어 초록 (Multilingual Abstract)

This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and Al6014-T4 alloy, and the cause of the differences in the weldability was investigated. In general, the surface ofthe aluminum alloy has an oxide film several nm thick, and local heat input is generated at the electrode-sheetinterface and the sheet-sheet interface during resistance spot welding. XPS analysis proved that the Al 5052-H32 alloy has a relatively thick magnesium oxide film on the surface and contains a large amount of magnesiumsolute element. As a result, Al 5052-H32 has a higher resistance, in both the contact resistance of the electrodesheetinterface and sheet-sheet interface, compared with the Al 6014-T4 alloy. Therefore, the Al 5052-H32 alloyhas a larger nugget diameter at the same welding current as compared to the Al 6014-T4 alloy, but the surfacecontamination of the electrode is aggravated due to local heat input. The results indicated that a difference inoxide film type and thickness can significantly influence resistance heat generation and electrode cooling effects,as well as produce welds with different weld morphology and microstructure. In addition, the Al 5052-H32 alloyhad more pores and shrinkage in the weld than Al 6014-T4 alloy, and longitudinal cracks were observed in thecenter of the nugget, but had relatively excellent mechanical properties.

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