Morphology and Performance of Resistance Spot Welding Joint between DC06 Galvanized Steel and 6016-T4 Aluminum Alloy under Asymmetric Heat Input
Source abstract
Abstract
Brittle intermetallic compound (IMC) is easily formed at the interface in resistance spot welding (RSW) of aluminum alloy and steel—heat significantly impacts the morphology of melt nugget and the distribution of IMC at the interface. This study studied the effects of process impact on morphology, IMC, and joint performance. The effects of process parameters on morphology, IMC, and performance under asymmetric heat input created by asymmetric electrodes were investigated. It was found that an IMC composed of Fe2Al5 and FeAl3 with a maximum thickness of about 5 μm was formed at the aluminum/steel interface in the welded joint. The thickness of IMC increased with welding current and welding time. The thickness of IMC was more relevant to welding time. Meanwhile, excessive heat input caused the aluminum nugget to be easily welded through. The Cu in the electrode diffused into the aluminum nugget and increased its hardness, but it did not improve the joint performance. The melting range of aluminum, thickness, and internal defects of the aluminum side was the main factors that affected the joint strength. This study shows that using asymmetric heat input is an effective method to improve the performance of steel and aluminum in RSW.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Welding Techniques Analysis · Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
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