Paper Details

Large pressure vessels are used in hydrogen containing environments, for example, in the petroleum industry inhydro-cracking, hydrodesulphurization and catalytic reforming processes as well as in the chemical and coal conversionindustries. All hydro processing reactors made of low carbon low alloy steel or Cr-Mo steel which require internal protectionof the reactor vessel walls experience electrochemical corrosion such as pitting corrosion, inter-granular corrosion, stresscorrosion cracking & hydrogen disbonding. Due to their excellent mechanical properties with good corrosion resistance andheat resistance, corrosion resistant alloys such as austenitic stainless steel and nickel based alloys are very suitable for thecladding of such pressure vessels in the petrochemical industries. The two most productive systems for surfacing the largecomponents which are subjected to corrosion or wear are submerged arc and electro- slag cladding, using a stripelectrode. Both processes are characterized by a high deposition rate, low dilution and high deposit quality. Both theseprocesses are suitable for surfacing flat and curved objects such as heat exchanger tube sheets and pressure vessels.Submerged arc welding (SAW) is most frequently used but, if higher productivity and restricted dilution rates are required,electro-slag welding (ESW) is recommended.

Dr. Sunil D. Kahar, “Review on Electro-Slag Strip Cladded Weld Overlays”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 3, Issue 8, pp. 1-8, August 2016.