Monitoring of the mechanical load and thermal history during friction stir channelling under constant position and constant force control modes

Abstract

In the present investigation, constant position and constant force process control modes; and representative process temperature measurements were analysed during the application of the friction stir channelling process. The experimental tests were carried out using rolled plates of AA5083-H111 with thickness of 15 mm. Results show that the FSC process was found not stable during the forward traverse movement stage when it is performed via position control. For both control modes, the tool was subjected to a more severe loading during the initial plunge than during the channelling period. Moreover, it was found that the tool vertical position is not significantly affected during the channelling stage when the process was force controlled. From the temperature measurements carried out, it was recorded a maximum process temperature of about 330°C.

Prediction of M–A Constituents and Impact Toughness in Stir Zone of X80 Pipeline Steel Friction Stir Welds

“…When welding is at a constant traverse speed, F x , F y and F z decrease simultaneously with the increase in tool rotational speed (600-800 r/min). It is because increasing the ratio of rotational speed and traverse speed (n/v) indicates the increase in welding heat input and the softening of the material around the tool is intensified during the welding process [22,23]. Moreover, an abnormal F y of 0.5 kN at the welding condition 800 r/min and 150 mm/min is noticed.…”

A review on friction stir-based channeling

“…Conversely, a special scroll feature on shoulder with a passage to extract material in form of self-detachable flash is designed that subsequently avoids imperfections, such as the step or sticky surface toe flash, observed in case of FSC with shoulder-workpiece clearance and FSC with tilt angle and toe flash. [9,[43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] The extracted material is collected in the form of self-detachable flash that can be reused with a separate processing technique, e.g. Friction Extrusion Process.…”

“…Variations in vertical force acting on tool's probe during channel formation phase for position control mode and force control mode. [56] increased stress concentration on probe (that acts as cantilever beam without shoulder's support). For example, Pandya et al [67] reported that the tool's probe is failed during channel processing phase when subjected with shoulder-workpiece clearance.…”

“…Variations in torque acting on tool's probe during channel formation phase for two different combinations of rotational speed and travel speed. [56] 3. 5.…”