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Clad steels are composite materials, made by mill rolling a thin sheet of metal that has desired properties over a base (‘backing’) plate of carbon or alloy steel. The cladding metal may be a stainless steel alloy, nickel alloy, or coper alloy. Under the heat and pressure of rolling, the dissimillar metals are bonded at the interface. The result is a composite with the strength of backing steel and with corrosion resistance, abrasion resistance, or other useful properties on the clad face.

Dari : jimoc@cbn.net.id

Sedikit ingin berbagi….dari berbagai source pakar welding tentang cladding.

Clad steels are composite materials, made by mill rolling a thin sheet of metal that has desired properties over a base (‘backing’) plate of carbon or alloy steel. The cladding metal may be a stainless steel alloy, nickel alloy, or coper alloy. Under the heat and pressure of rolling, the dissimillar metals are bonded at the interface. The result is a composite with the strength of backing steel and with corrosion resistance, abrasion resistance, or other useful properties on the clad face.
(The James F. Lincoln Arc Welding Foundation)

Now a days, some projects applicate clad pipelines. And here are the summaries of clad pipe.(Source : Graham Holloway from Metrode Ltd.,UK

-welding consumables manufacturer)

Clad Pipe is used in conjuction of :

– Cost savings compared to solid pipe

– Weight and wall thickness reductions

– Reduced fabrication times

Clad pipelines-welding, there are 3 approaches :

– Weld from both sides

* Only practical if there is access from both sides

* This approach restricts to larger diameter pipes

– Single side with buffer layer

* Limited practical application of this approach

* QA/ QC inspector control issue of ensuring the correct consumables is used for each pass

* Possibility of getting martensitic layer which is susceptible to cracking

* Required procedural control to minimise hardness is difficult to achieve consistenly

– Single side full alloy filler

* Full alloy help ensure no dilution in root

* No possible consumable mix

* No martensite formation or high hardness

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