Effects Of Non-metallic Components On The Welding Technological Properties Of E308LT1-1

Gas-shielded stainless flux cored wire is playing an increasingly important role in stainless steel welding materials because of its unmatched advantages over other welding consumables.It is widely used for welding large-scale structure made of stainless steel and corrosion-resistant surfacing.In recent years,through the efforts of domestic welding technicians and the digestion and absorption of foreign imported technology,the quality of the domestic stainless flux cored wire has been greatly improved,but compared with foreign countries,there is still a certain gap.The welding technological properties is mainly affected by the non-metallic components of the flux core.Therefore,the influence of non-metal components and their interactions on the technological properties of stainless steel flux-cored wire is studied.It has a great significance on improving the technological properties of the existing domestic stainless flux-cored wire and the development of high-end products.This project takes E308LT1-1 as the research object,and based on Design-Expert software,the regression model between process performance evaluation index(slagging rate,spattering rate,current coefficient of variation)and various non-metal components is obtained and proved by analysis of variance.The regression equation can better fit the test results.Finally,the actual verification model has a strong guiding significance for actual production,and intuitively analyzes the performance of each non-metal component through three-dimensional response maps and two-dimensional contour plots.The influence of the index.This project is based on Design-Expert software,taken E308LT1-1 as the research object,the regression model between process performance evaluation index(slagging rate,spattering rate,current coefficient of variation)and non-metal components is obtained.The regression equation can better fit the test results by analysis of variance.Finally,the model has a strong guiding significance for actual production by actual verification,and intuitively analyzes the performance of non-metal components through 3D and contour maps.The influence of the index.Based on the software's optimal solution function,the theoretically optimal non-metal component ratio was obtained.After fine-tuned with the contour.The actual optimal ratio was: 0.332 for rutile,quartz for 0.043,potassium feldspar was 0.053,white corundum was 0.008,PTFE was 0.006,the slag removal rate was 100%,the sputter rate was 1.19%,and the current coefficient of variation was 21.49%,which reached the level of similar foreign wire.High-speed camera and Hannover arc analyzer were used to study the transition pattern of droplets under different non-metal composition ratios,mainly for repulsive transition and short-circuit transition.repulsive transition has fine arc stability and splash rate but the short-circuit transition has Large splashes and poor arc stability.The analysis shows that when the surface tension is moderate and the PTFE content is small,repulsive transition,can be obtained.Finally,The Influence of melt-retardation of the core on droplet transfer was analyzed.Mild melt-retardation has a certain guiding effect on the droplet transfer and can increase the stability of the arc.