摘要
Abstract
To address the insufficient corrosion resistance of 20MnNiMo steel in specific environments,three welding processes,electroslag welding(ESW),flux cored arc welding(FCAW),and gas tungsten arc welding(GTAW),were employed to overlay a TP316L stainless steel layer on its surface to improve corrosion resistance.Stable welding parameters were determined through welding process tests,and the cladding layers were subjected to chemical composition analysis,side bend tests,hardness tests,intergranular corrosion tests,and metallographic structure observation.The results indicate that the chemical composition of the cladding layers is uniform and meets standard requirements(Ni mass fraction:11.0%to 15.0%,Cr mass fraction:16.0%to 20.0%);no cracks were generated in the side bend tests;hardness values were all below 250HV10;intergranular corrosion performance was qualified;and the microstructure consisted of a uniform austenitic matrix with a small amount of ferrite.The study confirms that all three processes,ESW,FCAW,and GTAW,can meet equipment manufacturing requirements.ESW uses single layer strip cladding with a cladding thickness of 4.0 to 4.5 mm;FCAW and GTAW require a two layer cladding of transition layer TP309L and corrosion resistant layer TP316L,with at least one layer for FCAW and at least two layers for GTAW in the corrosion resistant layer,and a total cladding thickness of 5.0 to 5.5 mm.This research provides reliable data support and process guidance for the engineering application of 20MnNiMo steel in corrosive environments,demonstrating significant practical engineering value.关键词
20MnNiMo钢/TP316L钢/电渣焊/药芯焊丝电弧焊/钨极气体保护焊Key words
20MnNiMo steel/TP316L steel/electroslag welding/flux cored arc welding/gas tungsten arc welding分类
机械工程
