Effect of reduced or zero pin length and anvil insulation on friction stir spot welding thin gauge 6111 automotive sheet
Effect of reduced or zero pin length and anvil insulation on friction stir spot welding thin gauge 6111 automotive sheet
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DOI：
10.1179/136217109x427494
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发表时间：
2009-07-01
影响因子：
3.3
通讯作者：
Prangnell, P. B.
中科院分区：
文献类型：
--
作者：
Bakavos, D.;Prangnell, P. B.
搅拌摩擦点焊(FSSW)是一种较新的焊接工艺，尚未得到充分的优化。本工作的目的是研究销钉长度和绝缘砧板对FSSW薄(0.9 mm)6111-T4铝汽车封闭板的影响。此外，还测试了无销钉工具，也就是“零销钉长度”工具。使用普通的打针工具和钢砧座，发现最佳的打针长度比常规使用的要短得多，范围在0.7-1 mm之间，而不是类似于1.4 mm。绝缘砧板将底部板材的峰值温度提高了45摄氏度，但与传统的销钉工具一起使用时，搭接剪切强度降低了15%。在无销钉工具的情况下，成功生产的焊缝具有与最佳常规工具测得的最高值相当的强度，没有保留焊接小孔或顶部薄板减薄(挂钩)。
Friction stir spot welding (FSSW) is a relatively new process, which has not yet been fully optimised. The aim of the work presented was to investigate the influence of pin length and an insulating anvil on FSSW thin (0.9 mm) 6111-T4 aluminium automotive closure panels. A pinless, or 'zero pin length', tool was also tested. With a normal pin tool and a steel anvil the optimum pin length was found to be considerably shorter than conventionally used, being in the range 0.7-1 mm, as opposed to similar to 1.4 mm. The insulated anvil increased the peak temperature in the bottom sheet by 45 degrees C, but there was a 15% reduction in lap shear strength when used with a conventional pin tool. In the case of the pinless tool, successful welds were produced with comparable strengths to the highest values measured with the optimum conventional tool without a retained weld keyhole or top sheet thinning (hooking).