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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Strength of Rivet Resistance Spot Welding Technique in Comparison with Self-Piercing Riveting for Multi-material Body-in-White Structure
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Fatigue Strength of Rivet Resistance Spot Welding Technique in Comparison with Self-Piercing Riveting for Multi-material Body-in-White Structure

机译：铆钉电阻点焊技术的疲劳强度与自刺穿铆接多材料铆接铆接

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摘要

Cost-efficient multi-material design requires suitable joining techniques, ideally with low investment cost by re-using existing assembling lines. The recently developed resistance rivet spot welding (RRSW) technique combines mechanical joining with spot welding and enables cost-efficient joining of aluminum (Al) to steel for multi-material body-in-white structures. Here, the static and fatigue strengths of different hybrid Al-steel specimens made by RRSW were measured and compared to other state-of-the-art joining techniques, such as self-piercing riveting (SPR) and RSW. The static strength of RRSW matched or exceeded that of SPR regardless of the sheet thickness, whereas the fatigue strength of the RRSW joints showed a strong dependency on the thickness of the steel sheets. For thinner steel sheets, the fatigue of the RRSW-joined metal sheets was lower in comparison with SPR. Fatigue cracks were initiated in thin steel sheets around the weld nugget. By contrast, for thicker steel sheets, the fatigue strength of RRSW matched or exceeded that of SPR. With a thicker material combination of 1.5 mm steel and 1.0 mm Al, fatigue cracks occurred only in the Al sheet in both SPR and RRSW. For suitable steel sheet thickness, RRSW is thus a durable technique to join steel and Al.
机译：具有成本效益的多材料设计需要合适的连接技术，理想情况下，通过重复使用现有装配线，以较低的投资成本。最近开发的电阻铆接点焊（RRSW）技术将机械连接与点焊结合起来，使铝（Al）与钢的成本效益高，可用于白色结构中的多材料车身。在这里，测量了RRSW制造的不同混合铝-钢试样的静态和疲劳强度，并与其他最先进的连接技术（如自冲铆接（SPR）和RSW）进行了比较。无论钢板厚度如何，RRSW的静态强度均与SPR相匹配或超过SPR，而RRSW接头的疲劳强度则表现出对钢板厚度的强烈依赖性。对于较薄的钢板，RRSW连接金属板的疲劳比SPR低。疲劳裂纹在焊缝熔核周围的薄钢板中萌生。相比之下，对于较厚的钢板，RRSW的疲劳强度与SPR相当或超过SPR。对于由1.5 mm钢和1.0 mm铝组成的较厚材料组合，在SPR和RRSW中，疲劳裂纹仅出现在铝板中。因此，对于合适的钢板厚度，RRSW是连接钢和铝的耐用技术。

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