Study On Welding Process And Properties Of Thick And Extra-thick Steel Plates For Marine Engineering

Since the opening of the twenty first century,with the non-stop improvement of Marine sources round the world,the metal used in Marine engineering has emerge as the pinnacle precedence of Marine engineering tools and Marine navy equipment,which inevitably entails the trouble of thick plate connection of Marine steel.The welding technique of metal plate connection is fantastically secure,however the welding overall performance of thick plate is terrible in the extraordinarily bloodless Marine environment.In particular,the low-temperature have an impact on sturdiness of the sheet after welding is low,so this thesis research the welding manner parameters and have an impact on sturdiness of the sheet after welding from each experimental and simulation angles.Based on the scan of slim hole laser wire filling welding of E36 Marine steel,the temperature discipline and stress subject mannequin of the total manner of slim hole laser wire filling have been established,the thermal cycle curve was once analyzed,and the temperature variant of sheet used to be analyzed in accordance to the thermal simulation results,and the rationality of layering was once discussed.According to the morphology of welding pool underneath one-of-a-kind parameters,the welding parameters had been optimized to locate higher welding parameters to enhance the welding quality.The stress discipline was once used to analyze the post-welding deformation and residual stress distribution of sheet steel below extraordinary welding parameters to discover the gold standard welding parameters.Finally,in accordance to the proper take a look at results,the simulated temperature subject molten pool morphology,residual stress and different complete factors,the top-quality welding parameters had been chosen as laser electricity of 4.5 k W and welding pace of10 mm/s.Secondly,in accordance to the slim hole multi-layer wire filling welding experience of E36 Marine steel,the ER55-Ni3 welding wire whose overall performance is shut to that of the new metal fabric to be studied is selected.The plate is pretreated earlier than welding with double-side trapezoidal groove.The slim hole laser wire filling welding approach is adopted to wire filling welding two 100 mm ultra-thick new Marine metal plates.A whole of 50 layers of wire filling are used to whole the welding of 100 mm extra-thick plate.Finally,in order to verify the rationality of the welding test,the low-temperature have an impact on sturdiness was once taken as the complete inspection index to elevate out the have an impact on sturdiness take a look at of the sheet earlier than and after welding.The measured have an effect on absorption power after welding was once greater than 80 J,which met the mission requirements.In addition to the experiment,the bodily plate was once modeled in 3D,the finite issue software program was once used to calculate and analyze the adjustments of the temperature subject and stress discipline in the total welding process,and the temperature gradient rule was once located in accordance to the isothermal floor of the temperature discipline to expose the alternate rule of the have an impact on toughness,so as to simulate the evaluation and predict the experimental results.Finally,the rationality and feasibility of the welding manner are validated and analyzed from the twin angles of simulation evaluation and experiment,and the overall performance is taken as the step forward point,which can furnish a reference for the sensible utility of the engineering trip idea and take a look at results.