| 摘要 |
PROBLEM TO BE SOLVED: To form a pipe axial cross angle in an acute angle so as to facilitate joining work and welding work by forming a flange wall between an opposing wall and a branch circumferential wall. SOLUTION: At the time of welding, since flange walls 14, 14a, 15, 17, 17a, 18 are formed on the whole of outer peripheral part of opposing walls 16, 19 and those flange walls 14, 14a, 15, 17, 17a, 18 on respective welding positions are positioned on a same flat surface, all welding surface is set to 180 degree and welding work is extremely facilitated on all welding parts. Especially even if the opening angleαof the branch part of both branch pipes 10, 11 is in a small level, a welding work space is enlarged by existence of the flange walls 14a, 17a, a welding surface becomes 180 degree, the inserting clearance of welding torch is ensured, and welding work is carried out extremely easily and surely.
|
