【摘 要】
：
An investigation on the quality of PVC joints welded by friction stir welding ( FSW with different shape of pin was carried out. The results show that when the
【机 构】
：
School of Materials Science and Engineering
论文部分内容阅读
An investigation on the quality of PVC joints welded by friction stir welding ( FSW with different shape of pin was carried out. The results show that when the rotating speed of stir toolis 1 660 r/min and the welding speed is 25 mm/min, the beads welded with upright taper pin are plump and joined well, the average tensile strength of which is 19. 1 MPa ( the maximum is 20. 3 MPa), being 49. 2% of that of parent material. The beads welded with cylindrical pin are also joined rather well plump and smooth, the average tensile strength of which is 17. 6 MPa, being 45.3% of that of parent material.The beads welded with inverted taper and cylindrical screw pin are only partially joined or disjoined. The optimum welding temperature range of PVC is 180 - 190 ℃. If the temperature beyond 200 ℃ the material will be burnt. If the temperature is under 170 ℃ the material will be joined partially or disjoined.
其他文献
Since softswitch is the kernel of the Next Generation Network (NGN), it is practically significant to improve the availability of the softswitch system. This pa
An enhanced definition of implicit key authentication and a secure group key agreement scheme from pairings are presented. This scheme combines the merits of gr
This paper described the work of welding process design for the "West-East" pipeline project, which is high pressure, large diameter and heavy wall thickness. A
A web page clustering algorithm called PageCluster and the improved algorithm ImPageCluster solving overlapping are proposed. These methods not only take the we
A novel digital secure communication system employing dual synchronization of chaos in two pairs of Colpitts circuits is proposed. The binary information to be
中国移动刚刚发布的半年报显示,2011年上半年,中国移动增值业务实现收入804亿元人民币,比上年同期增长18.5%,占营运收入比重达32.2%,显示出强劲的增长势头。江苏移动在发展增
A convolutional weighting (CW) scheme applied to a half-wavelength spacing array was proposed for multi-user system to joint STBC (space time block coding) and
Through the establishment mathematical model and experimental verification, the course of blunting of hard alloy cutter blade for cutting chemical fiber have be
The development of pressure and bioleaching processes for high grade copper ores and concentrates will result in copper solvent extraction plants treating solut
In this article we introduce an exact backprojecfion filtered (BPF) type reconstruction algorithm for cone-beam scans based on Zou and Pan's work. The algorithm