| 摘要 |
PURPOSE: To reduce energy for welding tube ends by welding tube ends with tube sheets ensuring the fusing condition in the tube end section by heating tire circular section of a tube sheet in the circumferential, direction. CONSTITUTION: A tube end section 4 and a tube sheet 3 are comprised of thermoplastic polymer pertaining to polymer series whose basic organ is the same as that of said tube end and tube sheet. A conical metal pin 5 to clamp and fix a tube end 4 in a tube sheet 3 is provided with a step section 6. A welding tool 7 on the upper side of the tube end section 4 comprising good heat conduction material is fixed in a thermal tool and includes a circular groove on the lower section thereof. When the welding tool 7 descends to the portion to be welded, the tube end section 4 is fused from inside thereof and pressed outwardly by the groove 10 mounted on the tube sheet 3. During said process, a side of the groove 10 is used to have a fusing section slid. When the welding tool is descended further, an outer ring of the groove 10 reaches the tube sheet 3 thereby the tube sheet is molten and the fusing section is formed to be welding junction section. |
