1994 年 12 巻 3 号 p. 328-334
The feasibility of using friction welding was used to join similar kinds of cast irons was studied. This study was carried out to examine influence of welding parameters on tensile properties of friction welded joints by similar materials of spheroidal graphite iron castings and gray iron castings. It was found that cast iron, which is difficult to join by fusion welding, can be joined by friction welding without resorting to special measures such as precheating or postheating. Under proper welding conditions, the friction welds are defect free.
This paper describes process parameters during friction welding which governing mechanical properties. Materials were selected two types of cast irons, spheroidal graphite iron castings and gray iron castings with flaky graphites which are called ductile cast iron and gray cast iron hereafter in this paper. The friction welding conditions for similar kinds of cast irons in the same diameter can be defined either by the minimum heat input rate or by the friction upset speed. The tensile strength of the joint increases with decreasing heat input rate or upset speed and it is possible to obtain joint strengths equal to that of the base metals.
