Quality Control Measures for Mid-Frequency Spot Welding Machines

The inspection of the welding quality of mid-frequency spot welders generally involves two methods: visual inspection and destructive testing. Visual inspection entails inspecting various aspects of the weld. If metallographic examination is required using microscopy, the welded fusion zone needs to be cut, extracted, and polished for corrosion. However, drawing conclusions based solely on visual inspection may not be sufficient, so it’s essential to conduct destructive testing.

Destructive testing typically involves tearing experiments, where the welded parent material is torn open for confirmation (one side showing circular holes, while the other side shows button-shaped residues). Additionally, there are methods using a tensile tester to test tensile strength.

Classification of Weld Joint Grades:

Grade One:

Withstands significant static, dynamic, or alternating loads, and failure of the joint could endanger human life.

Grade Two:

Withstands relatively large static, dynamic, or alternating loads, and failure of the joint could lead to system failure but does not endanger human safety.

Grade Three:

Typically used for joints subjected to smaller static or dynamic loads.

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