Weld Line Factors for Thermoplastics Ford Motor Company

Format:

Conference/Event

Author/Creator:

Sun, Sun, author.

Contributor:

Huang, Shiyao

Lu, Li

Su, Xuming

Tibbenham, Patricia

Zeng, Danielle

Zhou, Jin

Conference Name:

WCX 17: SAE World Congress Experience (2017-04-04 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2017

Summary:

AbstractWeld lines occur when melt flow fronts meet during the injection molding of plastic parts. It is important to investigate the weld line because the weld line area can induce potential failure of structural application. In this paper, a weld line factor (W-L factor) was adopted to describe the strength reduction to the ultimate strength due to the appearance of weld line. There were two engineering thermoplastics involved in this study, including one neat PP and one of talc filled PP plastics. The experimental design was used to investigate four main injection molding parameters (melt temperature, mold temperature, injection speed and packing pressure). Both the tensile bar samples with/without weld lines were molded at each process settings. The sample strength was obtained by the tensile tests under two levels of testing speed (5mm/min and 200mm/min) and testing temperatures (room temperature and -30°C). The results showed that different materials had various values of W-L factor. For neat PP, the W-L factor was high and independent to injection molding parameters or testing temperatures. For the talc filled PP, the W-L factor reduced significantly and was not sensitive to the injection molding parameters or testing speed. The talc particles played dominant role in reducing the W-L factor. The influence of packing pressure could be ignored

Notes:

Vendor supplied data

Publisher Number:

2017-01-0481

Access Restriction:

Restricted for use by site license