The study on the properties of AISI 4140 and AISI 1040 steel rods welded by friction welding

Abstract

This paper is aimed to investigate the properties of joint between AISI 4140 and AISI 1040 welded by friction
welding. The specimens were prepared in round shape of 13 mm diameter and 100 mm long. They were welded by friction welding method under the following conditions; friction pressure of 183 MPa, friction time
of 12 sec, upset pressure of 428 MPa, upset time of 7 sec. and rotational speed of 1400 rpm. The strength
and hardness were tested on the welded area. The result showed finer grains. in the welded area. This is the
result of friction pressure and upset pressure in the welding process. In addition, the observation result
indicated some changes of Ferrite and Pearlite in welded zone. This phase change resulted in the increment
of hardness in AISI 4140 at the contact area and adjacent. In part of AISI 1040, the portion of Pearlite and
Ferrite are not significantly changed, therefore the value of hardness is almost constant.