[설계] Seal weld & Strength weld

Seal Weld :

 

As per ASME VIII Div. 1 , UW-20.2(c) ,. A tube-to-tube sheet seal weld is one used to supplement an expanded tube joint to ensure leak tightness.

Mostly, fillet weld is preferred for Seal welding.

 

 

Strength Weld :

 

 

As per ASME VIII Div-1, UW-20.2(a)   A full strength tube to-tube sheet weld is one in which the design strength is equal to or greater than the axial tube strength, Ft. When the weld in a tube-to-tube sheet joint meets the requirements of UW-20.4, it is a full strength weld and the joint does not require qualification by shear load testing. Such a weld also provides tube joint leak tightness. Only Fillet weld or Groove with Fillet can be used , depends up on each project and its design requirements.

 

Job No. C2805 ( Half Pipe SS 304 ) – Strength weld by Fillet

Job No. C2592 ( Half Pipe SS 304 ) Strength weld by Fillet

Job No. C2371 –  Petrojet Egypt ( A 240 UNS S31803 Duplex )

Seal weld by Fillet

Job No. C2884 –  PDO OMAN ( A 240 UNS S2750 Super Duplex )

Strength weld by Groove with Fillet combined

Job No. C2884 SS 316L Strength Welds ( Groove & Fillet Type )

groove fillet

groove fillet

Job No. K199 – Seal weld by Fillet ( CS Tubes )

groove fillet