Pipe connection assembly of heat exchanger

A pipe connection assembly of a heat exchanger connecting a header tank and a pipe of the heat exchanger to each other, comprising:

• a manifold having one end connected to the pipe and the other end connected to an inner portion of the header tank so that a heat exchange medium flows;
• and
• a welding ring disposed at one end of the manifold so that the manifold and the pipe are fixedly coupled to each other,
• wherein the welding ring is disposed on one end surface of the manifold,
• wherein a space is formed between an inner surface of one end of the manifold and an outer surface of the inserted pipe, such that the welding ring is accommodated,
• wherein one end of the manifold includes a first body and a second body connected to one end of the first body and having an inner diameter greater than that of the first body,
• wherein the second body includes an extension member with an inner diameter of a 1-1-th radius, and a protrusion part with an inner diameter of a 2-2-th radius, formed by being hollowed out and projecting from the extension member, wherein the 2-2-th radius is smaller than the 1-1-th radius,
• wherein a portion of the welding ring is located to seat on the protrusion part, and
• wherein an inner diameter of the extension member is formed to be smaller than an outer diameter of the welding ring, such that another portion of the welding ring is located on the expansion member.