Superalloys are widely used in many industry fields because of its superior properties, such as high strength at
high temperature, good oxidation and hot corrosion resistance[1-3]. At present there exist some processing problems,
which affect the quality and property of welded joint, in the welding of superalloy structural components[4-6]. In the
case of tungsten inert gas (TIG) arc welding, the root of welding joint is often unwelded when single bevel groove
with backing locked is employed, and there also exists unwelded part in the back of butt girth welding seam. So the
welding of superalloy structural components is one of the key problem to solve their processing technology.
The influences of parameters of tungsten inert gas (TIG) arc welding, such as welding current, welding speed,
impulse frequency, weld remelting number and grooves, on the morphology, microstructure, tensile property and
fracture of welded joints of Ni-base superalloy have been studied in this paper, optimized processing parameters are
proposed, which provide experimental guidance for the application of Ni-base superalloy.