ABSTRACT

This research compares the mechanical behaviour of adhesive bonded (AB), friction stir spot welded (FSSW) and hybrid joints (H). The H joints were performed using both AB and FSSW. The influence of tool geometry, tool rotational speed and tool penetration depth on the joint strength were examined. The analysis of the mechanical performance of the joints was done using metallographic, hardness and tensile testing. In order to determine the local strains an optical extensometer with digital image correlation was used. Adhesive bonded joints displayed higher strength than welded or weld-bonded joints. Penetration of the tool pin into the lower plate increases the strength of the welded joint, although it has an unfavourable influence on defect formation. The weld-bonded (hybrid) joints have lower strength than adhesive-bonded joints or welded joints, as the uncured adhesive makes welding difficult, and the heat generated in the welding harms the adhesive.

摘要

本研究比较了粘合剂粘合 (AB)、摩擦搅拌点焊 (FSSW) 和混合接头 (H) 的机械性能。H 接头使用 AB 和 FSSW 进行。检查了刀具几何形状、刀具转速和刀具穿透深度对接头强度的影响。使用金相、硬度和拉伸试验对接头的机械性能进行分析。为了确定局部应变，使用了具有数字图像相关性的光学引伸计。胶粘接头比焊接或焊接接头具有更高的强度。工具销刺入下板增加了焊接接头的强度，尽管它对缺陷形成有不利影响。焊缝（混合）接头的强度低于胶粘接头或焊接接头，