FACTORS AFFECTING THE SHAPE OF WELD LINE

Experiments were carried out with a simple mold to examine the resin p roperties and physical characters of weld line, a surface defect that occurs when two flow fronts meet from different directions. There was no relation between the length and depth of the weld line. Furthermore , the length of the weld line was affected by elongational viscosity a nd surface tension, and the depth of the weld line was affected by spe cific heat and cooling rate of the surface of resin. As a result, a po ssibility of prediction of the shape of the weld line is presented.