Hello Hiren,
Hard facing alloys usually have little or low ductility as compared to many other corrosion or erosion resistant alloys. However cracks are not accepted as a rule. Hard facing containing cracks could be dislodged in service, if the extent of cracking is severe.
Perhaps adjusting the composition would be the way to go. The other technique could be use of austenitic(Ni based ) barrier layer.
What' re the technical requirements ?? You refer this article for general guidance.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of cbe swamy
Sent: Friday, June 21, 2013 1:30 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:17993] Cracks on Hard Facing Overlay
Dear All,
Where direct fusion welding is not appropriate, as in the case of an extremely hot-crack-sensitive casting, other
approaches might prove useful. One option is to "
Date: Fri, 21 Jun 2013 09:49:43 +0530
Subject: [MW:17992] Cracks on Hard Facing Overlay
From: hirensevak80@gmail.com
To: materials-welding@googlegroups.com
Where direct fusion welding is not appropriate, as in the case of an extremely hot-crack-sensitive casting, other
approaches might prove useful. One option is to "
Date: Fri, 21 Jun 2013 09:49:43 +0530
Subject: [MW:17992] Cracks on Hard Facing Overlay
From: hirensevak80@gmail.com
To: materials-welding@googlegroups.com
Dear Experts,
One of the manufacturer is using XL-CCH electrodes for Hard Facing Weld Overlay on c arbon steel material. (Chromium Carbide Alloy Deposit Hard Facing Electrode).
The weld overlay outer surface is showing parallel hair line cracks.
The manufacturer is arguing that these cracks are bound to develope due to inherrent properties of electrode & it is good to observe cracks on weld for ensuring the application of these type of electrode. The electrode catalogue also states that cracks can be developed on weld surface.
My question is which code/standard allow cracks on such hard facing overlay ?
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