In order to ensure that the quality of 12Cr2Mo1 forging strip electrode submerged arc surfacing Inconel625 meets the requirements of the design documents,the forging substrate and Inconel625 welding performance were analyzed,and the actual production status of the bearing product was simulated for surfacing process evaluation tests.Evaluation specimens were prepared using a combination of circumferential surfacing and straight surfacing,and the chemical composition,bending performance,hardness index,metallographic structure,and corrosion resistance of the surfacing layer were tested.The experimental results indicate that the use of EQ62-50/ES200 welding strip/flux combination can achieve excellent performance of the surfacing layer.Conduct corrosion rate detection on the overlay layer,and the corrosion rate of the welded sample is 1.50 mm/a,and the corrosion rate of the solid solution sample is 1.17 mm/a,with a ratio of 1.28,meeting the requirement of JB/T 4756-2006 standard that the ratio is less than or equal to 1.5.According to the qualified welding process,the tube plates of the hot high separation gas/circulating hydrogen heat exchanger were overlaid.The overlaid welding product has been in stable operation for three years,and there are no welding defects or corrosion defects.
关键词
12Cr2Mo1/Inconel625/换热器管板/带级埋弧堆焊/腐蚀试验
Key words
12Cr2Mo1/Inconel625/heat exchanger tube sheet/with grade submerged arc surfacing/corrosion test
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