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    Öğe
    AN INTRODUCTION TO RADIOGRAPHY EXAMINATION METHOD IN THE INSTRUCTION ON WELDING
    (Int Council Materials Education, 2020) Kejanli, Haluk; Gur, Ali Kaya; Turkmen, Mustafa; Caligulu, Ugur
    The radiography examination method is used to detect defects both inside and on the surface in the weld seams in metals and alloys. We describe the radiography examination method for instructional purposes. We provide an example of radiographic testing of AISI 1010 steel + copper materials welded by friction welding in a direct-drive type friction-welding machine. The subsequent radiographic testing shows that such a pair can be welded with adequate strength via the friction welding technique. The amount of flash increases in all specimens with increasing rotational speed, friction pressure, and forging pressure. On the other hand, as friction time increased, the amount of flash decreases.
  • [ X ]
    Öğe
    Radiographic inspection of AISI 420 steel friction welds
    (Carl Hanser Verlag, 2018) Kati, Nida; Cay, Vedat Veli; Ozan, Sermin; Caligulu, Ugur; Turkmen, Mustafa
    In this study, X-ray radiographic tests of AISI 420 steel welded by friction welding were studied. During the welding process, three different rotations, 700, 1000 and 1300, were employed while the other parameters such as friction pressure, friction time, upsetting-pressure and upsetting-duration were unchanged. After the completion of welding process, the welded joints were subjected to radiographic tests by X-raydiffraction. The result of the radiographic tests indicates that by increasing rotation speed the amount of flash and joining properties/performance increases in all samples. The best properties of the AISI 420 martensitic stainless steel joints were observed in samples welded at a rotation speed of 1300 (rpm). It has been determined that in harmony with the definition of welding defects and respective radiographic images, lack of fusion is the most common welding defect.