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

Muhammad Iswar,Rusdi Nur,P Puspitasari,Y Rohmat Aji Pradana,T Lenggo Ginta,A Ayu Permanasari,A Dwi Astuti,M Sharifi Jebeli,D Zakariya Lubis,A Larasati,I Srikun,M Niaz Akhtar,A.H Suryanto

doi:10.1051/matecconf/201820406004

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.

Highlights

Welding is one of the metal grafting techniques by liquefying some parent metal and filler metal with or without pressure and with or without additional metal and producing continuous connection
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 tensile test was performed by Dey et al [8], it concluded that post-weld heat treatment (PWHT) has marginal effect on improving the bend ductility of the joints

Summary

Introduction

Welding is one of the metal grafting techniques by liquefying some parent metal and filler metal with or without pressure and with or without additional metal and producing continuous connection. The technique of welding metal is divided into three methods, i.e. fusion welding, solid state welding and soldering and brazing. Friction welding is used extensively in various industries. Heat in friction welding is generated by conversion of mechanical energy into thermal energy at the interface of work pieces during rotational under pressure. Various ferrous and non-ferrous alloys having circular or non-circular cross sections and having different thermal and mechanical properties can be joined by friction welding method. Friction pressure, forging time, forging pressure and rotational speed are the most important parameters in the friction welding method [1]

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