후열처리에 따른 A105/A312 배관재의 이종 마찰용접 최적화 = Optimization of PWHT on Dissimilar Friction Welding for Piping Material of A105 to A312

다국어 초록 (Multilingual Abstract)

A study on dissimilar friction welded joints were performed using 22 mm diameter tube-to-bar in forging bar steel(ASTM A105) to stainless pipe steel(ASTM A312) for piping materials. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Virkers hardness surveys of the bond of area and HAZ, and macrostructure investigations. The specimens were tested as-welded and post-weld heat treated(PWHT). The tensile strength of the friction welded joints was increased up to 100 ％ of the A105 base metal under the condition of heating time(HT). Optimal welding conditions were n=2,000 rpm, HP=50 MPa, UP=100 MPa, HT=5 sec and UT=10 sec when the total metal loss(Mo) is 11 mm. The peak of hardness distribution of the friction welded joints can be eliminated by PWHT. Two different kinds of materials are strongly mixed to show a well-combined structure of macroparticles without any molten material and particle growth or any defects. In addition, the results of the radiological examination(RT) showed that there was no blowhole in the friction welding area.

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