Name a common non-destructive testing method used for welded joints.

Ultrasonic testing is a widely-used non-destructive testing method that employs high-frequency sound waves to detect imperfections or inconsistencies within welded joints. This method is highly effective because it allows for the evaluation of the integrity and quality of the weld without causing any damage to the material being tested. By sending sound waves into the weld, operators can measure the time it takes for the waves to return, interpreting variations in the reflected sound to identify cracks, voids, or porosity within the welded area.

Additionally, ultrasonic testing can be used on various materials and provides precise measurements, making it a preferred choice in industries where safety and structural integrity are paramount. Techniques such as time-of-flight diffraction and phased array can further enhance its accuracy and capability in assessing weld quality.

Visual inspection, while another common method, only allows for the identification of surface defects and does not provide subsurface information. Magnetic testing is effective for certain types of materials and defects but is limited to ferromagnetic materials. Destructive testing, by its nature, involves damaging the material to assess its properties and is not a non-destructive method. This distinction emphasizes why ultrasonic testing is crucial in ensuring weld integrity without compromising the material itself.