Although nondestructive testing technology is widely used in industrial field, it still faces great challenges in meeting the requirements of high-precision and high-resolution detection of weld defects. In particular, plate welds in critical sectors such as nuclear power and shipbuilding are often characterized by compact structural dimensions and complex spatial distributions, frequently located at corners, intersections of stiffeners, or other regions that are difficult to access. These features impose strict requirements on the size and placement of detection probes, which can typically only be deployed in close proximity to the weld. Existing ultrasonic inspection techniques generally rely on contact-based coupling or bulky transducers, making it difficult to simultaneously ensure excitation efficiency and defect detection sensitivity in confined spaces. Furthermore, these approaches often suffer from a low signal-to-noise ratio when detecting small-scale defects. To address these limitations, this study proposes a novel dual-arc V-shaped point-focusing electromagnetic acoustic transducer. The design employs a dual-arc meander-line coil combined with a symmetric V-shaped configuration, which not only confines the excited ultrasonic energy within a specific region but also significantly enhances the beam directivity and focusing performance. A finite element model was established to systematically investigate the influence of V-angle, central angle, and near-field characteristics on the transducer′s focusing capability and defect echo amplitude. The arc curvature of the dual-arc coil and the V-angle were optimized to improve the response to surface and near-surface micro-defects. Then, an experimental platform was built to detect the cracks and porosity defects in the weld. The research shows that the traditional transducer has limited detection effect on micro-cracks and hole-like defects, while the proposed new transducer can not only obtain clear reflected signals, but also achieve a minimum signal-to-noise ratio of 23.41 dB when detecting cracks with a size of 10 mm×0.5 mm×0.2 mm and blowholes with a diameter of 1 mm. This significantly improves the detection sensitivity and provides a high-sensitivity and non-contact detection scheme for weld defects detection of complex structures.