QW453
QW453
(OP)
In ASME Sec IX, QW 453, note 1, we read:
"for processe depositing a weld bead width greater than 1/2 in. wide, the weld overlay shall consist of a minimum of three weld beads in the first layer"
My questions:
1-How many layers shall be welded in corrosion resistance overlay? for example it can be welded 2,3 or more layers?
2-We can find 'T' or qualified range of thickness of test coupon but there is nothing about 't' or qualified range of diposite weld metal. it means that qualified range of diposite weld metal is according to QW 451?
"for processe depositing a weld bead width greater than 1/2 in. wide, the weld overlay shall consist of a minimum of three weld beads in the first layer"
My questions:
1-How many layers shall be welded in corrosion resistance overlay? for example it can be welded 2,3 or more layers?
2-We can find 'T' or qualified range of thickness of test coupon but there is nothing about 't' or qualified range of diposite weld metal. it means that qualified range of diposite weld metal is according to QW 451?
Regards
H.Mirhosseini





RE: QW453
1. To qualify a procedure for corrosion resistant weld overlay, the welder must deposit a minimum 1.5" wide X 6" long pad of weld overlay on a test coupon using the guidelines/notes in QW-453. For performance testing, the welder must deposit a minimum 1/2" wide weld overlay consisting of a minimum of 3 weld beads in the first layer. This is done to achieve the necessary dilution with the base metal. There is no limit on the maximum number of layers for the weld overlay (see below).
2. No. Corrosion resistant weld overlay is considered a special process, as described in QW-381. As such, in paragraph c)of QW-381 there is no limit on maximum thickness of the weld overlay deposit used in production. Other essential variables - base metal thickness, position and diameter must be followed.
RE: QW453
For thickness of overlay qualified, See QW-381(c). Basically, for welder qualification, a minimum of three passes on the first layer is all that is required for unlimited thickness overlay qualification.
RE: QW453
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
If it moves, train it...if it doesn't move, calibrate it...if it isn't written down, it never happened!
RE: QW453
But I have a problem yet
I want write a WPS for overlay for 2 different layers,can i have a PQR with any thickness of the weld overlay deposit? there is no any limit on maximum or minimum thickness of the weld overlay deposite in my WPS?
Regards
H.Mirhosseini