Half Bead Weld Technique
Half Bead Weld Technique
(OP)
Can anyone help me locate a standard or specification for employing the half bead weld technique? Am considering using this or butter/temper bead to fillet weld shear lugs on a 2.25% chrome piping system in lieu of PWHT.





RE: Half Bead Weld Technique
RE: Half Bead Weld Technique
RE: Half Bead Weld Technique
RE: Half Bead Weld Technique
RE: Half Bead Weld Technique
I have done repairs on cracked steam drum ligaments using this technique. The National Board Inspection Code mentions this technique as an alternative to postweld heat treatment.
The preheat an interpass temperatures are very closely controlled and heat input is also critical.
There is some information at: http://www.iamot.org/paperarchive/131B.PDF
I actually welded the PQR which consisted of a 2-1/2" vee groove on backing. The interetsing thing to note about this was that when I was done, the angular distortion on the plate was probably les than 3 degrees. No strongbacks or clamps were used. The grinding and waiting for the correct interpass temp made things pretty slow.
Good day
Gerald Austin
Iuka, Mississippi
http://www.weldinginspectionsvcs.com