Which inspection method is commonly used to evaluate GMAW welds?

The choice of magnetic particle testing and dye penetrant testing as a common inspection method for evaluating GMAW welds is correct because both methods are effective nondestructive testing techniques used to detect surface and near-surface discontinuities in ferromagnetic materials and non-magnetic materials, respectively.

Magnetic particle testing (MT) makes use of ferromagnetic properties of the weld material. It involves applying a magnetic field to the weld area and then sprinkling fine iron particles over the surface. If there are any surface defects, the magnetic field will draw the particles to the area of the discontinuity, making them visible for assessment.

Dye penetrant testing (PT) involves applying a liquid dye to the surface of the weld. The dye penetrates any cracks or flaws, and after excess dye is removed, a developer is applied that draws the dye out of the defects, making them visible for inspection. This method is effective for identifying surface-breaking defects.

Both methods are widely accepted in the industry due to their ability to reveal critical information about weld integrity without damaging the weld itself. They are complementary to visual inspections, which, while useful, cannot always detect sub-surface defects. The combination of these methods provides a comprehensive assessment of the quality and safety