Patent ID: 8770231

Claim:
An article of manufacture, comprising: a pipe element with a trimmed edge that is welded onto a carrier, wherein the trimmed edge has a first cam with which the pipe element is placed on a surface of the carrier; and wherein the trimmed edge has at least one second cam with which the pipe element is placed on a surface of the pipe element, so that an air gap remains between the surface of the carrier and the trimmed edge in a region lying between the first cam and the second cam; wherein the trimmed edge has at least a third cam with which the pipe element is placed on the surface of the pipe element; wherein a line of contact of the trimmed edge with the surface of the carrier in the region of the first cam has a length between 20° and 100°, and/or a line of contact of the trimmed edge with the surface of the carrier in the region of the second and/or third cams is less than 20°; and wherein the contact in the region of the second and third cams is essentially point-shaped, and wherein the carrier is tubular in shape.