STRUCTURE FOR JOINTING HEAT-EXCHANGER TANK AND TUBE

摘要

PROBLEM TO BE SOLVED: To improve reliability on brazing in a tube inserted part, in a brazed structure of a tube inserted in a tube-inserting hole in a tank made of a pipe material. SOLUTION: A plurality of narrow grooves 5 of shallow depths for inducing the brazing filler-metal are made radially on the surface of a curved hole edge 2b of a tube-insertion hole 2, and the ends of the grooves are allowed to reach to the edge 2b of the hole.