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Q: For inspection of welded joint, the method in which iron filling are spread over the weld and it is then subjected to an electric current is known as :
  • A. Magnetic particle method
  • B. Dye penetration method
  • C. Radiography method
  • D. Ultrasonic method
Correct Answer: Option A - • Magnetic Particle Method–Iron fillings are spread over the weld and it is then subjected to an electric current. The fillings form pattern which are interpreted to locate surface cracks. • Dye Penetration Method–The depth of a crack can be estimated by this method. A dye is applied over the weld surface and then the surplus is removed. • Ultrasonic Method–Ultrasonic sound waves are sent through the weld. Defects like flaws, blow holes etc. affect the time interval of sound transmission identifying the defect. • Radiography–X-rays or gamma rays are used to locate defects. This method is used in butt welds only.
A. • Magnetic Particle Method–Iron fillings are spread over the weld and it is then subjected to an electric current. The fillings form pattern which are interpreted to locate surface cracks. • Dye Penetration Method–The depth of a crack can be estimated by this method. A dye is applied over the weld surface and then the surplus is removed. • Ultrasonic Method–Ultrasonic sound waves are sent through the weld. Defects like flaws, blow holes etc. affect the time interval of sound transmission identifying the defect. • Radiography–X-rays or gamma rays are used to locate defects. This method is used in butt welds only.

Explanations:

• Magnetic Particle Method–Iron fillings are spread over the weld and it is then subjected to an electric current. The fillings form pattern which are interpreted to locate surface cracks. • Dye Penetration Method–The depth of a crack can be estimated by this method. A dye is applied over the weld surface and then the surplus is removed. • Ultrasonic Method–Ultrasonic sound waves are sent through the weld. Defects like flaws, blow holes etc. affect the time interval of sound transmission identifying the defect. • Radiography–X-rays or gamma rays are used to locate defects. This method is used in butt welds only.