The submerged arc surfacing with band-electrode technology is used to surfacing Inconel 625 on the 16 Mn tube sheet. And then the macroscopic testing

permeation testing

metallographic structure analysis

HV-hardness testing and corrosion resistance testing are used to test the quality of welded joints. By welding procedure qualification

suitable welding parameters are chose and formulated to ensure the welding quality to meet the requirements of design and use.