Certified Welding Inspector Practice Exam

What is the primary purpose of abrasive blasting?

1. To join metals through fusion

2. To remove coatings and contaminants

3. To heat treat materials for hardness

4. To apply protective coatings

The correct answer is: To remove coatings and contaminants

The primary purpose of abrasive blasting is to remove coatings and contaminants from the surface of materials. This process involves using a high-velocity stream of abrasive material, which can include substances like sand, steel shot, or glass beads, to clean surfaces effectively. Abrasive blasting is commonly used to prepare surfaces for further processing, such as welding or painting, by ensuring that they are free from rust, old paint, grease, and other contaminants. This results in a cleaner substrate, which is essential for achieving good adhesion of subsequent coatings or for ensuring that welds are made on a properly prepared surface. The technique is widely applied in industries such as metalworking, shipbuilding, and construction, making it a critical step in many fabrication processes where surface quality is paramount. This demonstrates its role in enhancing the overall integrity and longevity of the materials being treated.