Effects and defects of friction stir welds
Effects and defects of friction stir welds
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搅拌摩擦焊的影响和缺陷
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Schmücker
中科院分区：
文献类型：
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作者：
R. Zettler;T. Vugrin;M. Schmücker
摘要 人们经常提到的使用搅拌摩擦焊 (FSW) 的主要原因之一，特别是在连接轻合金时，是与传统熔焊（电弧）焊接工艺相比，缺陷发生率较低。然而，FSW 工艺确实有其自身的缺陷。据观察，这些缺陷是由于不同的 FSW 工艺变量而发生的，包括工具旋转和焊接行进速度、工具切入深度（轴向力）、工具倾斜角度、工具设计、工件之间的间隙大小、厚度不匹配或板厚度变化、工具相对于连接线的偏移、工具销长度相对于工件厚度的缺乏，以及残留在搅拌区内的自然产生的表面氧化物。本章讨论 FSW 时可能出现的效应和缺陷（即焊接缺陷）的根源、它们对接头残余机械强度的影响，并就如何确定这些现象发生的原因以及如何避免它们的发生提出建议。
Abstract One of the major reasons often cited for using friction stir welding (FSW), particularly when it comes to the joining of light alloys, is the low incidence of flaws that can occur compared with those produced by conventional fusion (arc) welding processes. The FSW process does, however, have its own characteristic flaws. These flaws have been observed to occur in response to different FSW process variables including tool rotation and weld travel speeds, tool plunge depth (axial force), tool tilt angle, tool design, the size of gap between workpieces, thickness mismatch or plate thickness variation, tool offset to the join line, a lack of tool pin length in relation to workpiece thickness, as well as naturally occurring surface oxides remaining entrapped within the stir zone. This chapter discusses the origins of effects and defects, i.e. welding flaws, that can occur when FSW, their implications with regard to residual mechanical strength of the joint, and makes recommendations as how to identify why these occur and how to avoid their occurrence.