Friction weldability of a PA 6 polymer

Mustafa Aydin

doi:10.3139/120.110702

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Friction weldability of a PA 6 polymer

Mustafa Aydin

Veröffentlicht/Copyright: 14. April 2015

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Abstract

In the present study, the weldability of friction welded polyamide 6 was investigated. Friction welding was conducted at a rotation speed of 2800 rpm and varying friction durations of 8, 12 and 16 seconds. It was found that the hardness of the sample did not change, but the tensile properties of the PA 6 material significantly decreased for the 8 s friction duration condition. In all samples, the tensile fracture occurred at the boundary towards the heat affected zone. The fractographic examination of the fractured PA 6 specimen showed brittle rupture of the specimen welded with 8 s friction duration. The optical microscopy, SEM and tensile test analysis suggested that the bonding line is well established in the welds. In contrast to the non-welded samples, the welded samples showed 55 % of the tensile strength.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurde die Schweißbarkeit mittels des Reibschweißprozesses von Polyamid 6 untersucht. Das Reibschweißen wurde hierzu mit einer Rotationsgeschwindigkeit von 2800 U·min⁻¹ und unterschiedlichen Reibdauern von 8, 12 und 16 Sekunden durchgeführt. Es stellte sich heraus, dass sich die Härte in den Proben nicht verändert, jedoch die Festigkeitseigenschaften des Polyamid 6 Werkstoffes bei einer Reibdauer von 8 s signifikant abnehmen. Bei allen Proben ergab sich der Bruch unter Zugbeanspruchung an der Grenze zur Wärmeeinflusszone. Die fraktografische Untersuchung der Polyamid 6 Proben zeigte einen spröden Bruch für die Probe, die mit einer Reibdauer von 8 s geschweißt wurde. Die licht- und elektronenmikroskopischen Untersuchungen sowie die Zugversuche deuten darauf hin, dass die Verbindungslinie gut ausgebildet ist. Gegenüber den nicht geschweißten Proben wiesen die geschweißten Proben 55 % der Zugfestigkeit auf.

§Correspondence Address, Assoc. Prof. Dr. Mustafa Aydin, Department of Mechanical Engineering, Dumlupinar University, Main Campus, 43100 Kütahya, Turkey, mustafa.aydin@dpu.edu.tr

Assoc. Prof. Mustafa Aydin, born in 1972, graduated from Gazi University, Ankara, Turkey in 1993. He completed his master's degree in 1995, and his doctorate in 2003 at Gazi University. He stayed for a post-doctoral year in the United States in 2009–2010. His areas of research and interest are solid state welding, nanomaterials and polymer materials. Presently, he is Associate Professor in the Department of Mechanical Engineering, Dumlupinar University, Kütahya, Turkey.

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Published Online: 2015-04-14

Published in Print: 2015-03-02

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https://doi.org/10.3139/120.110702