Outer beaded body for mounting and joint interfaces

A method of manufacturing a single module aftertreatment system comprising:

• providing an inner body configured to contain a catalyst within the inner body;
• providing an outer body having an inner diameter portion, the outer body comprising:
• a mounting portion having a flat upper surface, and
• a beaded portion adjacent to the mounting portion and configured to act as a physical barrier for aligning components mounted on the mounting portion, the flat mounting portion being parallel to the inner body;
• sliding the outer body over the inner body;
• and
• welding the inner diameter portion of the outer body to a portion of the inner body;
• wherein (i) an inner surface of the mounting portion facing an outer surface of the inner body, and (ii) an inner surface of the beaded portion facing the outer surface of the inner body, are separated from the inner body so as to form an air gap, and
• wherein a maximum distance from the outer surface of the inner body to the inner surface of the beaded portion is greater than a maximum distance from the outer surface of the inner body to the inner surface of the mounting portion.

A single module aftertreatment system comprising:

• an inner body housing a catalyst;
• and
• an outer body comprising:
• a mounting portion having a flat upper surface, and
• a beaded portion adjacent to the mounting portion,
• a first inner diameter portion at a first end of the mounting portion, the first inner diameter portion attached to the inner body at a first location, and
• a second inner diameter portion at a second end of the mounting portion, the second inner diameter portion attached to the inner body at a second location,
• wherein (i) an inner surface of the mounting portion facing an outer surface of the inner body, and (ii) an inner surface of the beaded portion facing the outer surface of the inner body are separated from the inner body so as to form an air gap that reduces heat transfer from the inner body to the outer body, and
• wherein a maximum distance from the outer surface of the inner body to the inner surface of the beaded portion is greater than a maximum distance from the outer surface of the inner body to the inner surface of the mounting portion.