The level of automation in the manufacture of recreational aluminum boats is very low. Robotized welding is rarely utilized, although it is commonly considered as the most effective way to reduce costs and increase co...The level of automation in the manufacture of recreational aluminum boats is very low. Robotized welding is rarely utilized, although it is commonly considered as the most effective way to reduce costs and increase competitiveness. A reason for the under-exploitation of robotics can be found in the construction of aluminum boats;boat models and their detailed structures are almost without exception individual pieces. A new stiffener structure for an aluminum recreational boat hull is developed in this work. Construction of the stiffener as a module allows exploitation of the advantages of modularization. The number of different parts is reduced and the structure simplified improves the applicability of robotic welding and provides benefits accruing from mass production. The same module can be used in several boat models. The modularity also makes it possible to use the same advanced robot welding fixture for a variety of boat models.展开更多
The introduction of the high power fiber laser with brilliant beam quality has enabled the rapid development of remote laser welding (RLW). This paper presents a theoretical review of remote laser welding. As a promis...The introduction of the high power fiber laser with brilliant beam quality has enabled the rapid development of remote laser welding (RLW). This paper presents a theoretical review of remote laser welding. As a promising technology, RLW offers increased flexibility, high operational speed, and reduced cycle time to process a wide range of workpieces. This study presents the typical characteristics of RLW with high power fiber lasers. It also investigates the influence of process parameters such as laser power, welding speed, shielding gas supply, beam inclination and focal position on the weld seam quality.展开更多
In this article,a new method has been presented for the estimation of fracture toughness in brittle materials,which enjoys improved accuracy and reduced costs associated with fracture toughness testing procedure compa...In this article,a new method has been presented for the estimation of fracture toughness in brittle materials,which enjoys improved accuracy and reduced costs associated with fracture toughness testing procedure compared to similar previous methods,because a vast range of specimens with irregular cracks can be accommodated for testing.Micron-sized alumina powders containing 0.05 wt%magnesium oxide(MgO)nanoparticles were mixed and also together with 2.5 vol%,5 vol%,7.5 vol%,10 vol%,and 15 vol%of silicon carbide(SiC)nanopowders separately.By making and testing various types of ceramics with different mechanical properties,and considering the irregular cracks around the indented area caused by Vickers diamond indenter,a semi-empirical fracture toughness equation has been obtained.展开更多
文摘The level of automation in the manufacture of recreational aluminum boats is very low. Robotized welding is rarely utilized, although it is commonly considered as the most effective way to reduce costs and increase competitiveness. A reason for the under-exploitation of robotics can be found in the construction of aluminum boats;boat models and their detailed structures are almost without exception individual pieces. A new stiffener structure for an aluminum recreational boat hull is developed in this work. Construction of the stiffener as a module allows exploitation of the advantages of modularization. The number of different parts is reduced and the structure simplified improves the applicability of robotic welding and provides benefits accruing from mass production. The same module can be used in several boat models. The modularity also makes it possible to use the same advanced robot welding fixture for a variety of boat models.
文摘The introduction of the high power fiber laser with brilliant beam quality has enabled the rapid development of remote laser welding (RLW). This paper presents a theoretical review of remote laser welding. As a promising technology, RLW offers increased flexibility, high operational speed, and reduced cycle time to process a wide range of workpieces. This study presents the typical characteristics of RLW with high power fiber lasers. It also investigates the influence of process parameters such as laser power, welding speed, shielding gas supply, beam inclination and focal position on the weld seam quality.
文摘In this article,a new method has been presented for the estimation of fracture toughness in brittle materials,which enjoys improved accuracy and reduced costs associated with fracture toughness testing procedure compared to similar previous methods,because a vast range of specimens with irregular cracks can be accommodated for testing.Micron-sized alumina powders containing 0.05 wt%magnesium oxide(MgO)nanoparticles were mixed and also together with 2.5 vol%,5 vol%,7.5 vol%,10 vol%,and 15 vol%of silicon carbide(SiC)nanopowders separately.By making and testing various types of ceramics with different mechanical properties,and considering the irregular cracks around the indented area caused by Vickers diamond indenter,a semi-empirical fracture toughness equation has been obtained.
