Abstract: Cr coated zircaloy cladding tube was welded by pulsed TIG welding, the weld forming and the microstructure were studied.The results indicate that the weld forming of Cr coated cladding tube is good, but Cr vapor attachs to the tungsten electrode, and reacts with W, which speeds up the electrode erosion.Cr coating leads to serious oxidation in the joint, and a fluffy layer is formed at the coating side of the weld.After water corrosion test, obvious peeling occurs in the fluffy layer.Cr element in the coating fuses into the weld and promotes grain refinement, but also results in inclusions in the weld.