Weld Line Meeting Angle is the meeting angle between two melt fronts, ranging from 0 to 135 degree, between two converging melt fronts. If the welding angle is 180 degree, then the two melt fronts can be considered as one. If the welding angle is 0 degree, then two melt fronts converge head-on. Generally, the smaller the meeting angle is, the weaker the strength of the part becomes and the more obvious the weld line will be after the part is ejected.