2009 Volume 46 Issue 1 Pages 4-12
Nickel particles of several tens μm were welded to a gold substrate by contact discharge welding and the joints were strengthened by non-contact discharge welding under various conditions. They can be welded at the same condition that the gold particles were welded, as described in our previous paper. The non-contact discharge welding was carried out in N2 gas flow, in Ar gas flow and in He gas flow. The fracture load of the joints welded in N2 gas flow were higher than those welded in Ar or He gas flow, though cracks were observed in some samples. Preheating of N2 gas and substrate were effective to suppress the generation of cracks to some degree. The fracture stress of the joint was about one sixth of base nickel, because of oxidation during welding.
