Systematic understanding on FSW tool damage for development of practical FSW tool for steels and titanium alloys

为了使钢和钛合金的搅拌摩擦焊（FSW）在实际应用中得到更广泛的应用，本文试图对FSW过程中焊接工具的损伤机理和影响工具损伤的工具材料因素进行研究。通过提高高温强度和分布大量平均尺寸为2 ~ 5 μ m的硬质相来抑制刀具损伤。为满足这些要求而设计的工具材料的工具寿命是现有工具材料的1.5倍。

To widely use friction stir welding (FSW) of steels and titanium alloys in the practical applications, fundamental knowledge on damage mechanism of welding tool during FSW and tool material factors governing tool damage attempted to be obtained. The suppression of the tool damage was achieved by both enhancement of high-temperature strength and distribution of large number of hard phases with average size of 2 to 5 micrometers. The tool material designed so as to meet these requirements exhibited 1.5 times longer tool life than the present tool material.