Features of welded joints based on zirconium-niobium alloy

ABSTRACT

The research results of the weldability evaluation and the development of technology for electron-beam, laser, and argon-arc welding of zirconium alloy are presented. The weldability of zirconium alloy with titanium alloy OT4 at EBW is studied. Optimum parameters of welding modes, which allow obtaining high-quality welded joints with a complete fusion without internal defects, are determined.

A comparative analysis of the welding method influence on the properties of welded joints is performed through the use of a set of analytical methods of investigation (metallography, microhardness measuring and fractography). The advantages of EBS are shown. The research results allow to recommend zirconium and alloys based on it as a constructional material for the production of welded structures with through seams and strength of joints of at least 90 % of the strength of the base metal.

KEYWORDS:

• Weldability
• argon-arc welding
• laser welding
• electron-beam welding
• zirconium alloy
• titanium alloy