METHOD OF PREPARING THROUGH HOLES IN TUBE BODY WALL SURFACES, AND TUBE BODY STRUCTURE

摘要

There is provided a through-hole manufacturing method for a cylindrical body wall that enables the operation of forming a through-hole without leaving a machining burr on the wall of a cylindrical member to be easily and reliably carried out without depending on experts. A through-hole manufacturing method for a cylindrical body wall in which a machining burr is not formed on inner walls of through holes 2a and 2b formed by a tool 11 piercing the wall of a cylindrical body 2, the method including a hole forming step of forming one pair or a plurality of pairs of the through-holes 2a and 2b in the cylindrical body wall by the tool 11 piercing the cylindrical body 2 from the outside orthogonally or substantially orthogonally to a cylindrical body axis 5 of the cylindrical body 2; and a welding step of sealing the through-hole 2a formed by the tool 11 piercing the cylindrical body 2 from the outer wall to the inner wall by welding using a welding jig 12 made of a material having better heat conductivity than the cylindrical body 2, wherein the through-hole 2b formed by the tool 11 piercing the cylindrical body 2 from the inner wall to the outer wall is left as a nozzle hole 3.