| 摘要 |
A method of attaching tubes of high-qualilty material, such as titanium, stainless steel, etc., in a tube plate of a simpler material which is not wherein or substantially not weldable to the tube material, involves attaching sleeves of the same material or substantially the same material as the tubes, to the tubes so that the sleeves extend somewhat beyond the tube plates, whereafter a cover plate, provided with holes therein and being of the same or substantially the same material as the sleeves, is attached to the sleeves ends by means of welding. |
