SGER: Friction Bit Joining - A New Solid State Spot Joining Process

SGER：摩擦钻头连接 - 一种新的固态点连接工艺

• 批准号: 0834729
• 负责人: Michael Miles
• 金额: --
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2009-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0834729&HistoricalAwards=false
• 关键词: SGER; Friction; Bit; Joining; New; SGER; Friction; Bit; Joining; New

The objective of this Small Grant for Exploratory Research (SGER) project is to study the capability of a new solid state joining process, termed friction bit joining, to weld dissimilar combinations of aluminum, magnesium and steel automotive sheets. The automotive industry and the US Government are aggressively pursuing use of lightweight materials such as Mg alloys and Al alloys in auto body structures for improved vehicle fuel efficiency. High-volume production vehicles would require use of a variety of engineering materials, ranging from ultra high-strength steels (UHSS), Al alloys, Mg alloys and others to meet cost and performance objectives. The combination of lightweight materials with widely acceptable structural materials such as UHSS presents a number of technical challenges in automotive body-in-white assembly. One of them is joining different materials to form an integrated structure component which meets design and performance requirements. The current work will study the welding process from a fundamental viewpoint, including the effect of process conditions on metallurgical bond properties of dissimilar alloy joints. The friction bit joining process has been shown to be capable of achieving high levels of strength in dissimilar alloy joints of DP 980 steel and 5754 aluminum alloys during a preliminary study. This combination of ultra high strength steel and a soft aluminum alloy would be difficult or impossible to join using conventional spot welding or even self piercing riveting.If this new process is shown to be successful in bonding dissimilar metal alloys where strength levels are very different, it will promote greater use of light metals in automotive and other transportation structures, allowing for reduced weight and improved fuel efficiency.

这项用于探索性研究（SGER）项目的小赠款的目的是研究新的固态连接过程的能力，称为摩擦位加入，以焊接铝，镁和钢制汽车板的焊接不同。 汽车行业和美国政府正在积极地追求轻巧的材料，例如汽车车身结构中的MG合金和AL合金，以提高车辆燃油效率。大批量生产的车辆将需要使用各种工程材料，从超高强度钢（UHSS），Al Alloys，MG Alloys和其他其他工程材料不等以满足成本和性能目标。轻巧的材料与广泛可接受的结构材料（例如UHSS）的组合在白色造成的车身装配中提出了许多技术挑战。其中之一是加入不同的材料，形成满足设计和性能要求的集成结构组件。 当前的工作将从基本的角度研究焊接过程，包括过程条件对不同合金关节冶金键特性的影响。 在初步研究中，摩擦钻头连接过程已显示能够在DP 980钢和5754铝合金的异种合金接头中实现高水平的强度。 超高强度钢和柔软的铝合金的这种结合将很难或不可能使用传统的焊接甚至刺穿的铆接加入。