What are casting defects explain their causes and remedies?

Casting defects are caused by non optimized process, failure of material, casting equipment. So the defects can be tolerated and repaired. In aluminum die casting the molten aluminum is poured or injected into metallic die. There are many sources to cast defects and have many names.

How can casting porosity be reduced?

Gas porosity can be eliminated through good mould design or by introducing nitrogen into the aluminium metal before the liquid pour. HiPping can also be used to eliminate small amounts of porosity inside the casting.

What are the defects arising during casting?

In die casting the most common defects are misruns and cold shuts. These defects can be caused by cold dies, low metal temperature, dirty metal, lack of venting, or too much lubricant. Other possible defects are gas porosity, shrinkage porosity, hot tears, and flow marks.

What are the common welding defects?

What are common weld defects?

• Lack Of Penetration or Incomplete Penetration.
• Lack Of Fusion or Incomplete Fusion.
• Undercut.
• Spatter.
• Slag Inclusions.
• Cracks.
• Porosity.
• Overlap.

What is investment casting used for?

Investment casting is generally used for making complex-shaped components that require tighter tolerances, thinner walls and better surface finish than can be obtained with sand casting. The distinguishing feature of investment casting is the way the mould is made.

What is the most common material used for patterns?

Typically, materials used for pattern making are wood, metal or plastics. Wax and Plaster of Paris are also used, but only for specialized applications. Sugar pine is the most commonly used material for patterns, primarily because it is soft, light, and easy to work.

What are the process of casting?

Casting processes involve the use of molten material, usually metal. This molten material is then poured into a mould cavity that takes the form of the finished part. The molten material then cools, with heat generally being extracted via the mould, until it solidifies into the desired shape.

What kind of defects should not be there in good welding?

Surface defects that impair welding quality

• Pits.
• Undercut.
• Overlap.
• Insufficient reinforcement.
• Surface cracking.
• Arc strike.
• Bead meandering (bent/misaligned bead)
• Remaining groove.