Cladding welding method for corrosion-proof materials in the mechanical engineering industry

As corrosion stress is confined to the surfaces, economics can be effected in material costs by cladding non-alloy or low-alloy steels with corrosion-resistant materials. However, due to the high processing costs, the use of semis clad by welding begins to pay, in general, only for wall thicknesses over 10-20 mm. Up to wall thicknesses of about 50 mm, roll-clad sheet is mainly used; with thicker gauges, fusion-cladding processes are advantageous. Among pressure-welding cladding processes, technical importance has been achieved with roll-cladding and explosion cladding. The most important fusion-welding processes used for cladding with corrosion resistant materials are reviewed. In table 4 are listed more important data in connection with gas-shielded, submerged arc and plasma-welding processes, which may provide the first criterion in choosing a process. (orig.)