P-added high strength IF steel M250P1 is widely used in vehicle body and safety parts because of its good mechanical performance and forming properties.Experiments of high power laser welding of 4.8 mm thick P-added h...P-added high strength IF steel M250P1 is widely used in vehicle body and safety parts because of its good mechanical performance and forming properties.Experiments of high power laser welding of 4.8 mm thick P-added high strength IF steel M250P1 is performed by using a 12 kW CO_2 laser.In order to investigate the effects of phosphorus in high strength steel on the quality of welding,the Cupping and tensile tests,optical and SEM energy dispersive spectrometer analysis have been done on three welded joints.Some results have been obtained below.In the given welding parameters,the welded joints show good tensile and forming properties.However,it has been also found that the cracking is easy to occur in the fusion zone of welded joint during deformation.Some research works have been done.The results show that the fast cooling of fusional metal leads to the phosphorus microsegregation in the fusion zone because of relative low diffusion rate of phosphorus,which brings about the poor toughness of welded joints.展开更多
This paper focuses on an estimation of light weighting opportunities for the frame structure of com- mercial road vehicles. This estimation is based on simpli- fied static load cases which play a predominant role for ...This paper focuses on an estimation of light weighting opportunities for the frame structure of com- mercial road vehicles. This estimation is based on simpli- fied static load cases which play a predominant role for the dimensioning of a frame structure and therefore these simplifications are not putting the general validity of the conclusions into question. A comparison of different ma- terials under this scenario shows that light metals do not show any weight reduction advantage in comparison to steel while a material-independent topology optimization has more weight reduction potential for the frame structure than a simple change of materials. Considering the con- straints of part complexity which is directly linked with production and assembly cost, the ladder frame structure has become the current state of the art design. Thus the paper also puts a spotlight on basic rules of node design and vertical load induction in order to keep the weight of such a design as low as possible. Practical examples from manufacturers show that the weight of a commercial vehicle could be reduced by 10%, and main parts of the frame structure could be reduced by 30% using high strength steel in combination with innovative production methods like roll forming.展开更多
文摘P-added high strength IF steel M250P1 is widely used in vehicle body and safety parts because of its good mechanical performance and forming properties.Experiments of high power laser welding of 4.8 mm thick P-added high strength IF steel M250P1 is performed by using a 12 kW CO_2 laser.In order to investigate the effects of phosphorus in high strength steel on the quality of welding,the Cupping and tensile tests,optical and SEM energy dispersive spectrometer analysis have been done on three welded joints.Some results have been obtained below.In the given welding parameters,the welded joints show good tensile and forming properties.However,it has been also found that the cracking is easy to occur in the fusion zone of welded joint during deformation.Some research works have been done.The results show that the fast cooling of fusional metal leads to the phosphorus microsegregation in the fusion zone because of relative low diffusion rate of phosphorus,which brings about the poor toughness of welded joints.
文摘This paper focuses on an estimation of light weighting opportunities for the frame structure of com- mercial road vehicles. This estimation is based on simpli- fied static load cases which play a predominant role for the dimensioning of a frame structure and therefore these simplifications are not putting the general validity of the conclusions into question. A comparison of different ma- terials under this scenario shows that light metals do not show any weight reduction advantage in comparison to steel while a material-independent topology optimization has more weight reduction potential for the frame structure than a simple change of materials. Considering the con- straints of part complexity which is directly linked with production and assembly cost, the ladder frame structure has become the current state of the art design. Thus the paper also puts a spotlight on basic rules of node design and vertical load induction in order to keep the weight of such a design as low as possible. Practical examples from manufacturers show that the weight of a commercial vehicle could be reduced by 10%, and main parts of the frame structure could be reduced by 30% using high strength steel in combination with innovative production methods like roll forming.
