Heat input during friction stir welding: Experimental measurement and approach to fundamental phenomena

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14137
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Tohoku University
• Principal Investigator: SATO Yutaka 東北大学, 工学研究科, 准教授 (00292243)
• Co-Investigator(Renkei-kenkyūsha): FUJII Hiromichi 東北大学, 大学院工学研究科, 助教 (70560225)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 摩擦攪拌接合 / 入熱 / カロリメトリー法

Outline of Final Research Achievements

Heat input into the workpiece during friction stir welding was experimentally measured by calorimetry, and then an empirical equation consisting of input variables to calculate the heat input was established. Moreover, effect of heat input on weld quality was systematically examined. The measured heat input was higher in Al alloys with the larger thermal conductivity. The input variable exhibiting the largest contribution to heat input was travel speed among the variables used in this study. Besides the shoulder diameter, the probe dimension highly affected the heat input. Grain size of the stir zone was well correlated with the normalized heat input, which was product of heat input and rotational speed, and tensile strength and fracture location of 6063 Al weld was associated with the heat input.

Free Research Field

工学