Study on Weldability of Electron Beam Welding for Thick Plate of Austenitic Stainless Steel (Report 1)

Abstract

It is well known that electron beam welding is superior in high efficiency, precision, and economy of cost, because of obtaining deep penetration with a single pass. Then it is eagerly awaited to apply electron beam welding for nuclear power plant components.
On the other hand, austenitic stainless steel widely used for nuclear power plant components. In this case, it is desirable to lower welding heat input as low as possible.
In response to this demand, the authors have been studied the welding conditions and the chemical compositions of base metal to prevent weld defect of austenitic stainless steel. The results obtained are summarized as follows:
(1) Electron beam welding is applicable for austenitic stainless steel up to 80 mm thickness.
(2) To prevent hot cracking, (P+S) contents of base metal should be controlled under 0.045%.
(3) To prevent porosity, nitrogen contents and oxygen contents should be controlled under a certain value according to the thickness.