What is surface welding used for? - ANSWER 1. Used to build up thin surfaces
2. Corrosion protections
3. Abrasion Resistance
What are slot welds used for? - ANSWER Used often in automotive thin materials
What is destructive testing? - ANSWER Either using a machine to bend or stretch two
pieces of metal welded to metal to test the strength of the weld
What is non destructive testing? - ANSWER 1. Mag particle: An electric current and mag-
netic particles are used to show cracks
2. Liquid Penetrant: Spraying a die on one side of weld and then spray a developer on other
side. The developer will soak up die. Any cracks or holes can be found.
3. Ultrasonic: Using an ultrasonic machine to find cracks and holes.
What is a discontinuity? - ANSWER An interruption of the typical structure of a material,
in its mechanical, metallurgical, or physical characteristics. A discontinuity is not necessarily
a defect. It can be a crater crack caused by improper termination of a welding arc.
The most severe discontinuity is what? - ANSWER a crack
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2. Corrosion protections
3. Abrasion Resistance
What are slot welds used for? - ANSWER Used often in automotive thin materials
What is destructive testing? - ANSWER Either using a machine to bend or stretch two
pieces of metal welded to metal to test the strength of the weld
What is non destructive testing? - ANSWER 1. Mag particle: An electric current and mag-
netic particles are used to show cracks
2. Liquid Penetrant: Spraying a die on one side of weld and then spray a developer on other
side. The developer will soak up die. Any cracks or holes can be found.
3. Ultrasonic: Using an ultrasonic machine to find cracks and holes.
What is a discontinuity? - ANSWER An interruption of the typical structure of a material,
in its mechanical, metallurgical, or physical characteristics. A discontinuity is not necessarily
a defect. It can be a crater crack caused by improper termination of a welding arc.
The most severe discontinuity is what? - ANSWER a crack
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