The present paper discusses the modeling of tool geometry effects on the friction stir aluminum welds using response surface methodology. The friction stir welding tools were designed with different shoulder and tool ...The present paper discusses the modeling of tool geometry effects on the friction stir aluminum welds using response surface methodology. The friction stir welding tools were designed with different shoulder and tool probe geometries based on a design matrix. The matrix for the tool designing was made for three types of tools, based on three types of probes, with three levels each for defining the shoulder surface type and probe profile geometries. Then, the effects of tool shoulder and probe geometries on friction stirred aluminum welds were experimentally investigated with respect to weld strength, weld cross section area, grain size of weld and grain size of thermo-mechanically affected zone. These effects were modeled using multiple and response surface regression analysis. The response surface regression modeling were found to be appropriate for defining the friction stir weldment characteristics.展开更多
Paper mill workers (106) exposed to noise ranging from 80 to 96 dBA were assessed foralteration in clinical status. Neurobehavioral functions were examined with the help of aquestionnaire. The study did not reveal any...Paper mill workers (106) exposed to noise ranging from 80 to 96 dBA were assessed foralteration in clinical status. Neurobehavioral functions were examined with the help of aquestionnaire. The study did not reveal any changes attributable to noise in subjectsexposed to 86-90 dBA and )90 DBA noise in course of their occupations.展开更多
基金supported by the Department of Scientific and Industrial Research(DSIR),India
文摘The present paper discusses the modeling of tool geometry effects on the friction stir aluminum welds using response surface methodology. The friction stir welding tools were designed with different shoulder and tool probe geometries based on a design matrix. The matrix for the tool designing was made for three types of tools, based on three types of probes, with three levels each for defining the shoulder surface type and probe profile geometries. Then, the effects of tool shoulder and probe geometries on friction stirred aluminum welds were experimentally investigated with respect to weld strength, weld cross section area, grain size of weld and grain size of thermo-mechanically affected zone. These effects were modeled using multiple and response surface regression analysis. The response surface regression modeling were found to be appropriate for defining the friction stir weldment characteristics.
文摘Paper mill workers (106) exposed to noise ranging from 80 to 96 dBA were assessed foralteration in clinical status. Neurobehavioral functions were examined with the help of aquestionnaire. The study did not reveal any changes attributable to noise in subjectsexposed to 86-90 dBA and )90 DBA noise in course of their occupations.
