What are the quality inspection standards for welded joints of Manhart (Guangdong) CNC Machine Tool Co., Ltd?

**What are the quality inspection standards for welded joints**
The quality inspection of welded joints is an important link to ensure welding quality, safety, and performance stability. In the process of quality inspection of welded joints, the following inspection standards and methods are usually used:
**1 Appearance inspection**
Visual inspection is a visual inspection of the surface of welded joints, including defects such as appearance quality, undercut, weld overlap, porosity, cracks, etc. Qualified welds should have a smooth and continuous surface without obvious welding defects.
**2 Ultrasonic testing**
Ultrasonic inspection is a method of detecting internal defects in welded joints by reflecting waves generated by defects encountered during the propagation of ultrasonic waves inside materials. This method is suitable for detecting defects such as porosity, inclusions, and lack of fusion inside welds.
**3 Metallographic examination**
Metallographic inspection evaluates the quality and performance of welded joints by observing their metallographic structure. By observing the grain size, microstructure uniformity, and inclusions of the weld seam under a metallographic microscope, the mechanical properties and corrosion resistance of the welded joint can be determined.
**4 Bending test**
Bending test is to evaluate the plasticity and toughness of a welded joint by bending it to a certain angle and observing whether there are cracks or fractures. This method is suitable for detecting the plastic deformation ability and crack resistance of welded joints.
**5 Strength test**
Strength testing evaluates the strength performance of welded joints by applying tensile, compressive, bending and other forces to measure their load-bearing capacity and failure mode. This method can intuitively reflect the mechanical properties and load-bearing capacity of welded joints.
**6 Impact test**
Impact testing is an evaluation of the toughness and sensitivity of a welded joint by applying a certain energy impact load to observe its impact resistance and failure mode. This method is suitable for detecting the impact resistance of welded joints under dynamic loads.
In summary, the quality inspection standards for welded joints include various methods such as visual inspection, ultrasonic inspection, metallographic inspection, bending test, strength test, and impact test. The selection and implementation of these inspection standards and methods should be determined based on specific welding joint types, materials, and process requirements to ensure that the quality of welding joints meets relevant standards and requirements.