The paper gives an analysis on technical characteristics of repair techniques for friction stir welding defects. To overcome the defects,a new repair technique, inertia friction pull plug welding( IFPPW), was research...The paper gives an analysis on technical characteristics of repair techniques for friction stir welding defects. To overcome the defects,a new repair technique, inertia friction pull plug welding( IFPPW), was researched and its equipment was developed as well. Elementary datum was achieved by investigating the influences of technological parameters on mechanical properties and by analyzing the structural characteristics of repair joint with IFPPW. The study shows that the stability and reliability of welding process of IFPPW can be guaranteed through the constant energy from the flywheel.Integrated with the advantages of friction pull plug welding,the IFPPW,free from back anvil,is considered as a promising technique in repair of termination keyhole of bobbin tool friction stir welding and point-like defects in aluminum alloy welding.展开更多
文摘The paper gives an analysis on technical characteristics of repair techniques for friction stir welding defects. To overcome the defects,a new repair technique, inertia friction pull plug welding( IFPPW), was researched and its equipment was developed as well. Elementary datum was achieved by investigating the influences of technological parameters on mechanical properties and by analyzing the structural characteristics of repair joint with IFPPW. The study shows that the stability and reliability of welding process of IFPPW can be guaranteed through the constant energy from the flywheel.Integrated with the advantages of friction pull plug welding,the IFPPW,free from back anvil,is considered as a promising technique in repair of termination keyhole of bobbin tool friction stir welding and point-like defects in aluminum alloy welding.
文摘对可提供4J重力势能的无碳小车的绳轮机构进行了设计.在设计中,选取定滑轮材料为尼龙,并采用控制变量法对不同材料绕绳的打滑率进行了计算,确认选择聚氯乙烯为绕绳的最佳材料.在初始条件一定的条件下,对绳轮机构的预紧力进行研究,确认预紧力不小于0.5 N时,无碳小车的打滑率最低.通过对绕绳轴直径进行分析,确认圆锥形轴在保持无碳小车平稳性方面具有优越性,并确定圆锥形轴的锥度为4°,底面直径为40 mm,高度为70 mm.
