Method and apparatus for additive friction stir manufactured transition joint

A method of manufacturing a dissimilar metal article, comprising:

• aligning a first metallic component with a second metallic component, wherein the first metallic component comprises steel or stainless steel and the second metallic component comprises aluminum or an aluminum alloy;
• forming a transition joint between a first metallic component first end surface and a second metallic component first end surface;
• and
• forming a collar around the transition joint and at least a portion of a first metallic component outer surface and a second metallic component outer surface.

A dissimilar metal article comprising:

• a yoke comprising:
• a yoke outer surface;
• a plurality of divots formed in the yoke outer surface;
• and
• a flared portion sloping radially outward from the outer surface;
• and
• a pipe having a pipe inner surface defining a pipe interior;
• wherein:
• the flared portion is provided in the pipe interior and abuts the pipe inner surface so as to form a gap between the pipe inner surface and the yoke outer surface;
• the yoke and the pipe are joined by friction stir welding;
• and
• an additive flow material at least partially fills the plurality of divots and the gap between the pipe inner surface and the yoke outer surface.