Appearance inspection: The surface of the die-casting has obvious, irregular, sunken linear lines (both penetrating non-penetrating), the shape is small narrow, sometimes the junction edge is smooth, which may be possible under the action of external force.

The reasons are as follows:

1) The two metal streams are connected to each other, but they are completely fused there are no inclusions in between, the bonding force of the two metals is very weak.

2) Pouring temperature die casting mold temperature is too low

3) The runner position is wrong the flow path is too long

4) Low filling speed

The solutions prevention methods are:

1) Increase pouring temperature appropriately

2) Improve the injection ratio, compress the filling time increase the injection speed

3) Improve exhaust filling conditions