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FM-52M, a kind of filler metal matched for Inconel 690, is widely applied in critical components of nuclear power plant. In this work, the effect of the microstructure refinement of FM-52M was studied through pulse TIG welding. First, a serial of bead welds under different welding parameters were conducted to elucidate the effect on the grain refinement of weld. Optical microscope and electron backscattered diffraction were used to analysis the interaction between welding parameters and average grain diameter. The results revealed that the grain orientation and microstructure have a great change by introducing the pulse current. In addition, the influence of welding process parameters on the weld grain size is obviously different. In a reasonable range of parameter, the grains became smaller with the peak current increasing. Furthermore, pulse frequency and duty cycle had the same effect on microstructure. In contrast, a scent of grain coarsening appeared with base current increasing.

Study on Grain Refinement of Nickel-Based Filler Metal 52M Microstructure by Pulse TIG Welding