In actual engineering practice, commonly-used methods for treating welding mark include:

First, improve welding temperature to a degree as high as possible. Properly improve the melt plastication temperature, nozzle temperature, mold temperature as well as pre-warming temperature for inserts, reduce flow stroke or flow time of melt prior to confluence( sometimes the number of gates can be increased at no spare)；improve screw rate to achieve rapid filling, which can not only reduce heat loss during the filling but also can increase the sharing friction heat during melt flow to remedy the heat loss of melt; optimize the design of feed system accompanied with proper injection pressure, increase shearing friction heating during the flow, improve flow state of melt and strengthen the capacity of confluence.

Next, change position of welding mark and locate it on a part insensitive to the mechanical property and appearance quality of products; change wall thickness on the premises of not influencing requirement for use of the plastic parts.

During mold design, preferably reduce the number of gates; properly design the cold-slug well and the exhausting measure for molds at places where welding mark occurs; use release agent as less as possible; sufficiently dry the raw materials.

treating welding mark