PURPOSE: To enhance the weldability of a high-strength high-electrically-conductive copper alloy used as a material for the damper shield, etc. of a large capacity superconductive generator by adding a specified amt. of Ni and Si to copper.
CONSTITUTION: An alloy consisting of Ni 1.3W2.5wt%, Si 0.3W0.6wt%, and the balance Cu and inevitable impurities. The Ni and Si contents of the alloy is appropriately adjusted to a ratio in which a Ni5, Si2 intermetallic cpd. is formed. The Ni and Si are mostly being dissolved in the copper before welding, and the Ni-Si intermetallic cpd. precipitates in an about equilibrium state at a desired temp. after welding. Accordingly, occurrence of weld cracks is prevented, and satisfactory welding results are obtd. by putting a Ni alloy on a groove even in welding to an iron alloy. By making use of this alloy no weld crack occurs in a damper shield, etc., and superior strength and electrical conductivity are provided.
KIRIHARA SEISHIN
SAKAMOTO MASAHIKO
