According as the friction welding has been increasingly applied in manufacturing various machine components because of its significant economic and technical advantages, one of the important concerns is the reliable quality evaluation method for a good weld strength and toughness in process of mass production. However no reliable nondestructive test method is available at present to monitor the weld strength and toughness quantitatively in process. In this continued study since the 1st report, acoustic emission technique is applied to inertia friction welding to examine the effects of main welding parameters on the weld tensile- strength and tatal AE counts in process of welding for finally developing real-time quality evaluation of friction welding of machine components by acoustic emission technique.
In this study, acoustic emission technique is applied to inertia friction welding as a promisingly reliable and repeatable quality monitoring method to examine the effects of main welding parameters (inertia, rotating speed and axial pressure) on the weld strength (tensile strength) and acoustic emission counts in inertia welding of heat resisting low alloy steel bars (AISI 4140) to sulphurized free machining steel bars (AISI 1117, 12L14) and low carbon steel tubes (AISI 1020) to austenite The calculated equations for relationship between weld strength and total AE counts are made to be utilized for quality control. Consequently, the objectives of this study are as the following:
To examine the effects of welding parameters (inertia, rotating speed, pressure) on the weld strength and total AE counts,
to determine the optimum welding conditions for the joint efficiency more than 100 % and
to make the quantitative relationship equations between rotating speed n and weld strength (tensile strength) σT or total AE counts N, and then the calculated σTn-N equation.
