Abstract：The parameters of melt converging angle, flow front temperature, pressure were proposed to characterize the performance of weld line and the WSt model was established to judge the quality of weld line. Based on this, the quality of weld line was contrasted between ordinary molding and rapid heat cycle molding(RHCM) under the same processing parameters. The wind deflector was produced to verification.The results indicate that the weld line performance increases from 0.681 to 0.819, with an increase of 20.3%. And through the tensile experiment of the wind deflector, it can be found that the tensile strength of wind deflector increases from 45.3MPa to 53.8MPa. The strength increases by 18.8%, which is close to 20.3%, as predicted by WSt model.
吴雄喜, 刘健. 熔接痕性能评价的WSt模型及其验证[J]. 材料工程, 2015, 43(9): 46-52.
WU Xiong-xi, LIU Jian. WSt Model of Estimating Weld Line Performance and Its Verification. Journal of Materials Engineering, 2015, 43(9): 46-52.
 KOVACS J G, SIKLO B. Experimental validation of simulated weld line formation in injection moulded parts[J]. Polymer Testing, 2010, 29(7):910-914.
 OZCELIK B, KURAM E, TOPAL M M. Investigation the effects of obstacle geometries and injection molding parameters on weld line strength using experimental and finite element methods in plastic injection molding[J]. International Communications in Heat and Mass Transfer, 2012, 39(2):275-281.
 WANG G L,ZHAO G Q,WANG X X. Effects of cavity surface temperature on mechanical properties of specimens with and without a weld line in rapid heat cycle molding[J]. Materials and Design, 2013, 46(4):457-472.
 CHEN S C, JONG W R, CHANG J A. Dynamic mold surface temperature control using induction heating and its effects on the surface appearance of weld line[J]. Journal of Applied Polymer Science, 2006, 101(2):1174-1180.
 LI H, GUO Z, LI D. Reducing the effects of weld lines on appearance of plastic products by Taguchi experimental method[J]. International Journal of Advanced Manufacturing Technology, 2007, 32(9-10):927-931.
 CHEN C S, CHEN T J, CHEN R D, et al. Investigation on the weld line strength of thin-wall injection molded ABS parts[J]. International Communications in Heat and Mass Transfer, 2007, 34 (4):448-455.
 LIU S J, WU J Y, CHANG J H. An experimental matrix design to optimize the weld line strength in injection molded parts[J]. Polymer Engineering and Science, 2000, 40(5):1256-1262.
 WU C H, LIANG W J. Effects of geometry and injection molding parameters on weld line strength[J]. Polymer Engineering and Science, 2005, 45(7):1021-1030.
 CHEN S C, CHANG Y, CHANG Y P, et al. Effect of cavity surface coating on mold temperature variation and the quality of injection molded parts[J]. International Communications in Heat and Mass Transfer, 2009, 36(10):1030-1035.
 OZCELIK B. Optimization of injection parameters for mechanical properties of specimens with weld line of polypropylene using Taguchi method[J]. International Communications in Heat and Mass Transfer, 2011, 38(8):1067-1072.
 HASHEMI S. Effect of temperature on weldline integrity of injection moulded short glass fibre and glass bead filled ABS hybrids[J]. Polymer Testing, 2010, 29(3):327-336.
 BIEROGEL C, GRELLMANNA W, FAHNERT T, et al. Material parameters for the evaluation of PA welds using laser extensometry[J]. Polymer Testing, 2006, 25(8):1024-1037.
 XIE L, ZIEGMANN G. Influence of processing parameters on micro injection molded weld line mechanical properties of polypropylene (PP)[J]. Microsystem Technologies, 2009, 15(9): 1427-1435.
 肖长江,刘春太,申长雨. 注塑制件熔接痕的形成、性能和预测[J]. 工程塑料应用,2003, 31(3):17-20. XIAO Chang-jiang, LIU Chun-tai, SHEN Chang-yu. Formation, performance and prediction of weld mark in injection molding[J]. Journal of Engineering Plastics Application, 2003, 31(3):17-20.
 FÉLIX M, ROMERO A, MARTÍN-ALFONSO J E, et al. Development of crayfish protein-PCL biocomposite material processed by injection moulding. Composites Part B: Engineering, 2015, 78(1):291-297.
 XIAO C L, HUANG H X. Development of a rapid thermal cycling molding with electric heating and water impingement cooling for injection molding applications. Applied Thermal Engineering, 2014, 73(1):712-722.
 ZHAO G Q, WANG G L, GUAN Y J, et al. Research and application of a new rapid heat cycle molding with electric heating and coolant cooling to improve the surface quality of large LCD TV panels[J]. Polymers for Advanced Technologies, 2011, 22(5):476-487.
 王桂龙,赵国群,李辉平,等.基于CAE的大型LCD注塑面板变模温设计与分析[J]. 材料工程, 2009, (9):24-28. WANG Gui-long, ZHAO Guo-qun, LI Hui-ping, et al. Design and analysis of variotherm injection molding of large LCD panel based on CAE[J]. Journal of Materials Engineering, 2009, (9):24-28.