Regenerator repair welding
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There are hot spots on the regenerative inclined tubes in our unit’s regenerator; it is estimated that this is caused by the peeling off of the lining inside. The workshop has decided to weld steel plates in place of those affected areas. What type of steel plate should be used? Will this approach work?
It can be used as a temporary solution; generally, the inclined tubes are made of 16MnR material, with an operating temperature below 425–450 degrees. For safety reasons, they can be covered with 304 stainless steel, which offers better temperature resistance
Stainless steel 304 – we’ve left it as it is since we welded it, and there’s no problem at all.
I think it’s still necessary to measure the temperature around the leak points to determine whether there is large-scale peeling of the lining. If so, it’s best to line the outside first and then weld regular steel plates.
Stainless steel will do; we often carry out repair welding and enclose it in a box
16MnR will do. However, the method of welding a interlayer and adding an insulating lining in between can yield better results.