Weld overlay of SS clad CS plate
Weld overlay of SS clad CS plate
(OP)
We have a vacuum column that requires internal weld overlay for process reasons. It requires a overlay with 316 SS, and a Mo content greater than 2.5%. The column is designed to BS PD5500. The column already had a internal cladding - it's ASTM A263 explosion bonded plate (18mm ASTM A204-A plate with 3mm ASTM A240 TP410S cladding). The cladding is corroding in the current service, hence requiring the upgrade to 316. A weld overlay contractor has advised that they have had experience in applying SS weld overlay directly to a existing cladding with success.
Our concers is that with the large area of weld overlay required and the resultant shrinkage that I woud expect, it might be possible that the explosion bonded cladding with the additional weld overlay 'peels' off the base plate ie delaminates.
Our driver to leave the existing cladding in place and apply the weld overlay on top of this is due schedule constraints in an upcomming plant shutdown.
If anyone has had experience with this they are willing to share, please advise.
Our concers is that with the large area of weld overlay required and the resultant shrinkage that I woud expect, it might be possible that the explosion bonded cladding with the additional weld overlay 'peels' off the base plate ie delaminates.
Our driver to leave the existing cladding in place and apply the weld overlay on top of this is due schedule constraints in an upcomming plant shutdown.
If anyone has had experience with this they are willing to share, please advise.
RE: Weld overlay of SS clad CS plate
In most locations they will actually be fusing through the existing clad layer.
If you are going to hit 2.5% min Mo with any weld dilution you may need to use 317L for the overlay. Just saying....
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Plymouth Tube
RE: Weld overlay of SS clad CS plate
RE: Weld overlay of SS clad CS plate
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Plymouth Tube
RE: Weld overlay of SS clad CS plate
The alternative to this is the removal of the cladding (by arc errosion) but will significantly add to the timeframe for the job.
RE: Weld overlay of SS clad CS plate
RE: Weld overlay of SS clad CS plate
RE: Weld overlay of SS clad CS plate
RE: Weld overlay of SS clad CS plate
Either way a trial is in order before you commit.
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Plymouth Tube
RE: Weld overlay of SS clad CS plate
RE: Weld overlay of SS clad CS plate
I do agree a trial should be performed. However, factoring the cost of performing 100% UT coverage to ensure adequate bond must be evaluated for the entire job. If anything goes wrong with this type of repair this could result in extended outage time.
RE: Weld overlay of SS clad CS plate