A method of cladding of the interior of a component part of a pressure vessel is shown. A lining which conforms to at least a portion of the interior geometry of the component is positioned (303) in the interior of the component. The lining is then pressed (304) into the component past its yield strength. The lining is then fused (305) to the component. The lining may be a seamless tube, a helical strip or an arcuate extrusion. The lining may be stainless steel or a nickel based alloy. An apparatus for pressing and fusing the lining is also provided.
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