Effect of friction welding conditions on tensile strength and hardness of AISI 310 stainless steel joints

¹ Mechanical Engineering Department, Politeknik Negeri Ujung Pandang, 90245 Makassar, Indonesia
² Centre for Materials and Manufacturing, Politeknik Negeri Ujung Pandang, 90245 Makassar, Indonesia

^* Corresponding author: rusdinur@poliupg.ac.id

Abstract

This study aims to determine the effect of rotational speed and forging time on tensile strength and hardness through the friction welding process of stainless steel AISI 310. The research was carried out by friction welding process by using the lathe machine with varying rotational speed (550, 1020 and 1800 rpm), forging time (25, 35, 45 seconds), and welding temperature of 1050°C ± 10°. Axial pressure was obtained through the addition of a hydraulic system to the release head of a lathe machine with a forging pressure of 123.8 N/mm². Furthermore, the friction welding results were tested mechanically by conducting the tensile and hardness tests. The experimental results showed that the highest tensile strength of the friction welding result of 706,61 N/mm² was obtained at 1800 rpm and 45 seconds, and this value is lower when compared with raw material (780,25 N/mm²). The highest hardness value (61.5 HRC-A) was located on the welded joint section with 550 rpm of rotational speed and 25 seconds of forging time. The hardness of the parent metal is 69.45 HRC-A. The rotational variation influences the hardness value, the higher the rotational speed will increase the hardness. The longer of forging time will decrease the hardness.