PENGARUH VARIASI WAKTU GESEK TERHADAP DISTRIBUSI TEMPERATUR, TINGKAT KEKERASAN, KEKUATAN TARIK, DAN STRUKTUR MIKRO PADA PENGELASAN CONTINUOUS DRIVE FRICTION WELDING PADA LOGAM SIMILAR STAINLESS STEEL 304

Welding solid cylindrical materials with fusion welding have a flaw. Welding is only possible on the exterior of the surface, as it is difficult to weld on the inside. The goal of this research is to see how frictional pressure affects the tensile strength, microstructure, and hardness of Continuous Drive Friction Welding (CDFW) joints. Stainless Steel 304 solid cylinder metal was used in this experiment. The machining process was carried out using a lathe by the JIS Z 2201 standard, and the stainless steel 304 solid cylinder metal was cut 75 mm long. Variations in friction time of 3, 5, 7, and 9 seconds were used in the welding process. Friction pressure of 50 MPa, forging pressure of 50 MPa, and forging time of 3 seconds were the other parameters used. A friction welding machine with a 1000 rpm rotation performs the friction. The mechanical tests performed were tensile and Vickers hardness tests using the ASTM E384 standard. The temperature distribution revealed that the longer the time, the higher the welding temperature, with the highest results at a 9-second time variation of 667°C and the lowest at a 3-second time variation of 321°C. The tensile test results show that as the friction time increases, the tensile strength decreases. The highest tensile strength was 476.9 MPa at a friction time variation of 3 seconds, and the lowest tensile strength was 302.4 MPa at a friction time variation of 9 seconds. The results of microstructure observations at a friction time of 9 seconds have the tightest grains and porosity defects are found in the splicing results. The hardness test shows that the hardness value in the welded joint area increases as the friction time given increases. Based on all the given friction time variations, it can be concluded that the result of tensile strength with a friction time variation of 3 seconds is the best.