Based on ASME Code :-
1. Expanded or rolled and flared.
2. Flared not less than 1/8 in, rolled and beaded
3. Flared, rolled and welded.
4. Rolled and seal-welded, provided the throat of the seal weld is not more than 3/8 in and the tube rerolled after welding.
5. Superheater, reheater, waterwall or economizer tubes may be welded without rolling or flaring, provided the welds are heat-treated after welding and the welding is done according to Code requirements.
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