1. Casting cold-lap defect featuresAfter the metal liquid filling and liquid metal in the junction of fusion is bad, and penetrate in casting or not through the gap called cold insulation.Appear on the far away from the port of the surface of the casting and thin wall.The shape is in the shape of the liquid flow in the early one-on-one hit smooth, edge is rounded.
2. The reason 1) due to the amount of liquid metal is not enough, or by reason of running fire, led to the suspension of pouring.2) the flow of liquid metal in the cavity.The chemical composition of 3) alloy is not appropriate, came out and the pouring temperature is low, the metal melt oxidation, liquidity is poor.4) is not reasonable, gating system design, inappropriate position of sprue in the cross section area is too small, small number.The height of the SPR is low, liquid metal head is not enough.