Single-side right-angle weld joint concave surface detection sample plate and using method thereof

The present invention discloses a single-side right-angle weld joint concave surface detection sample plate and a using method thereof, relates to the field of measuring devices, and solves the problem that effective thickness of fillet weld cannot be measured by single-side right-angle welding. A structure of the detection sample plate has N detection sample plates (3), and one fastening screw (4); each of the detection sample plates (3) has an opening at a tail center, and all the detection sample plates are screwed together and fixed by the fastening screw (4); a theoretical basis for design of the detection sample plates (3) is government Standard GB150.3-2011 Appendix D. With two weld toes (1) and an interception point of the effective thickness a of the fillet weld on an angle bisector, a circle is drawn through three points to obtain an arc surface between the two weld toes, that is, a convex surface of the detection sample plates (3), and N detection sample plates with different values are made. When