Method of welding an aluminium object to a stainless steel object

摘要

The surface of the stainless steel object to be welded is flame sprayed with a powder mixture of aluminium and a metal having a high melting point, e.g. nickel, to form a thin film undercoat which in turn is flame sprayed with a layer of very pure aluminium. The aluminium object is then welded to the coated surface of the stainless steel object using very pure aluminium as filler. Flame spraying is advantageously made using a plasma gas mixture including one part of hydrogen and ten parts of nitrogen. The bonded portions of the two objects may be electroplated with a thin film of nickel.