Mid-frequency spot welding machines typically have two methods for inspecting welds: visual inspection and destructive testing. Visual inspection involves inspecting each project, and if metallographic examination is used with microscope photos, the welded fusion zone must be cut and extracted and then corroded. However, concluding based solely on visual inspection is insufficient; destructive testing is necessary.
Destructive testing usually involves tearing experiments to confirm by tearing the welded base material (one side showing circular holes, the other side showing button-like residues). In addition, there is also a method of tensile strength testing using a tensile tester.
To accurately assess weld quality, destructive testing of welds should be performed. Destructive test methods include: mechanical test method, on-site test method, metallographic relief method. The former uses a mechanical performance tester to measure tensile shear, tensile, compression, torsion, impact, and other properties.
However, mechanical test methods have the disadvantage of requiring specimens of appropriate shapes and clamping the specimens in a certain position on the tester. The advantage is that they display performance values. Metallographic inspection is used to measure the fusion zone size and identify welding defects.
Good joint quality should be reflected in having a certain strength and plasticity, especially the latter should be given more attention. Due to the characteristics of the process itself, high-quality joints with properties similar to the base material can be obtained under appropriate conditions.
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Post time: Mar-16-2024
