Key points of welding quality control of medium frequency spot welding machine

There are generally two methods for inspecting the welding quality of medium frequency spot welding machines: visual inspection and destructive inspection. Visual inspection is performed on each item. If microscopic (mirror) photos are used for metallographic inspection, the welding nugget part needs to be cut off and extracted and ground and corroded. It is not sufficient to draw conclusions only through appearance inspection. Please be sure to conduct a destructive experiment.

Destructive testing usually involves a tearing test, tearing open the welding base material for confirmation (circular holes appear on one side, and button-like residue appears on the other side). In addition, there is also a method of using a tensile tester to test the tensile strength.

The quality requirements for solder joints should include three aspects: good electrical contact, sufficient mechanical strength and smooth and neat appearance. The most critical point to ensure the quality of solder joints is to avoid false soldering.

After the visual inspection is completed, the power-on inspection can only be carried out after the diagnostic connections are correct. This is the key to verifying the circuit performance. Without strict visual inspection, power-on inspection is not only more difficult, but may also damage equipment and instruments, causing safety accidents. For example, if the power supply connection is weakly soldered, you will find that the device cannot be powered on when power is turned on, and of course it cannot be checked.

Power-on inspection can reveal many tiny defects, such as circuit bridges that cannot be observed by visual inspection, but it is not easy to detect the hidden dangers of internal soldering. Therefore, the fundamental issue is to improve the technical level of welding operations and not leave the problem to inspection work.

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