Spot welding machine troubleshooting and mechanical structure details
The visual inspection of spot welding machine faults mainly relies on keen visual and auditory observation, that is, audio-visual inspection. Obvious problems such as fuse melting, line breakage, connector loosening, electrode wear, etc. can often be seen at a glance. If the visual inspection fails to solve the problem, further power supply inspection is required. At this time, multimeters and oscilloscopes will become powerful assistants. They can accurately measure the input and output voltages of the control transformer, the power supply voltage, and the waveform of the test point, so as to lock the source of the fault and carry out targeted repairs.
When conditions permit, the substitution method is a fast and effective troubleshooting method. By replacing the normal solder resist controller, the fault location can be quickly located. Even if the cause cannot be found directly, the inspection scope can be greatly reduced to avoid unnecessary time waste.
The electrode of the spot welding machine is made of chromium zirconium copper material, which has low resistivity and low heat energy consumption. Only regular repair of the electrode can effectively prevent the increase of the contact area and ensure that the strength of the solder joint is not affected. The specific dimensions of the electrode are: length 40mm, diameter 6mm, and end diameter 2.5mm.
The mechanical pressure mechanism of the spot welding machine is exquisitely designed. When assembling, the guide rod and the support rod must be firmly fixed on the bottom plate, and then the lightweight reset spring must be put on. Then the pressure rod must be assembled in place, and finally the two electrodes must be fixed on the bottom plate and the pressure rod respectively. In this process, it is very important to ensure the coaxiality of the two electrodes.
During welding, the workpiece is placed between the two electrodes. By rotating the nut on the support rod (for thin and small parts, the electrode spacing is small), the pressure rod drives the electrode to move toward the bottom plate, and the workpiece is tightly clamped. After welding is completed, the nut is rotated in the opposite direction, and the reset spring lifts the pressure rod and the electrode, and the workpiece is separated.
In the inverter precision spot welding machine, the heat-generating parts such as the welding transformer, electrode arm, electrode, conductive plate, ignition tube or thyristor switch need to be cooled by water cooling. When designing, in addition to meeting the parameter requirements, the design of water cooling and cooling water channels must also be fully considered. Improper design of the cooling water channel or processing defects may cause the welding transformer and other components to burn out.
The cooling water system occupies a pivotal position in the inverter spot welding machine. Before using a precision spot welder with a cooling water circuit, you must first connect the water source. The distribution of cooling water must be reasonable. The welding transformer, upper and lower electrodes and conductive plates, ignition tubes or thyristor switches should form a circuit respectively, and then be connected to the water inlet and outlet pipes. The connection between the water pipe joint and the hose or steel pipe should be tight and reliable to prevent water leakage, which is especially important for welding transformers and thyristor switches.
The connection between the inlet and outlet pipes of the precision spot welder and each circuit usually uses a hose, the material is a cloth-reinforced hose or a nylon reinforced tube, and the pipe diameter is selected according to actual needs. The hose should be fixed neatly and beautifully on the welding machine to ensure the overall aesthetics and stability.
