铝基复合材料搅拌摩擦焊过程中搅拌针的磨损预测

摘要

Friction stir welding is the preferred joining method for aluminium matrix composites. It is a solid-state process which prevents the formation of the intermetallic precipitates responsible for degradation of mechanical properties in fusion welds of these composites. The major concern in friction stir welding is the wear of the welding tool pin. The wear is due to the prolonged contact between the tool and the harder reinforcements in the composite materials. This paper provides an overview of the effects of different parameters of friction stir welding on the tool wear. It was found that the total amount of material removed from the tool is in direct proportion to the rotational speed of the tool and the length of the weld but inversely proportional to the transverse rate. The results even demonstrate that the tool geometry also has significant influence on the wear resistance of the tool. The tool even converts itself into a self-optimized shape to minimize its wear.%搅拌摩擦焊是铝基复合材料首选的焊接方法。这是一种固态焊接方法，可以防止熔焊中形成的金属间化合物导致力学性能下降。搅拌摩擦焊最主要的问题是搅拌针的磨损。磨损是由于搅拌针与复合材料中硬质增强相长期接触而造成的。本文综述了不同搅拌摩擦焊参数对搅拌针磨损的影响。研究发现，搅拌针的材料磨损量与搅拌针的转速和焊接长度呈正比，与行进速度呈反比。搅拌针的几何形状也与磨损量密切相关。搅拌针甚至可以转变成自优化形状以减小磨损。