Patent ID: 9669491
Date: 2017-06-06
CPC Classifications: B23K,B32B,C21D,C22C,C23C,F16B,Y10T

Claim:
1. A method of forming a steel part, the method comprising: coating a first steel plate to obtain a first precoat upon the first steel plate so as to define a first base, a first intermetallic alloy layer on the first base and a first metal alloy layer on the first intermetallic alloy layer; on a first face of the first steel plate, removing the first metal alloy layer in a first area of the first steel plate, while leaving at least part of the first intermetallic alloy layer in the first area; coating a second steel plate to obtain a second precoat upon the second steel plate so as to define a second base, a second intermetallic alloy layer on the second base and a second metal alloy layer on the second intermetallic alloy layer; on a second face of the second steel plate, removing the second metal alloy layer in a second area of the second metal plate, while leaving at least part of the second intermetallic alloy layer in the second area; after removal of the first and second metal alloy layers, butt-welding the first steel plate to the second steel plate at the first and second areas to form a welded blank; performing a heat treatment on the welded blank; and shaping the welded blank after the heat treatment into the steel part.