The flow direction of the polymer melt is perpendicular to the direction of
injection moulding: after the polymer solidifies this unfavourable orientation
remains in the weld zone, which is the reason for the reduced strength of the
weld compared to the bulk strength of the material.
Welding is aesthetically clean, and forms a very strong bond which is
Welding of thermoplastic parts is based on interdiffusion of molecular
chains.It requires elevated temperatures, pressure and time to achieve a good