There are many reasons why the welding robot burns the contact tip during the welding production process. For example, the surface phenomenon of frequent replacement of the contact tip is: the wear of the contact tip outlet causes the wire feeding to deflect, and the actual welding track is shifted, that is, the TCP point position shift, Lead to welding defects such as welding offset or welding leakage.
Analysis of Problems Caused by Welding Robot Burning Contact Tip
1. The reason for the failure of the contact tip itself
The wear of the contact tip of the welding robot itself is caused by the wear at the outlet of the contact tip due to the friction of continuous wire feeding under the rising temperature of the contact tip. During the welding operation of the welding robot, calibration errors often occur and affect production. efficiency. At this time, you should try to reduce the temperature of the contact tip, including the composition of the contact tip and the processing of the contact tip structure. The material of the contact tip: brass, red copper, among which chromium zirconium copper is the best; even adding ceramic components to the contact tip can increase the wear resistance. The third is the processing accuracy of the contact tip. Due to the accuracy of the processing equipment or other problems, the inner hole finish and concentricity of the contact tip are not good enough.
2. The arc is unstable, causing the arc to burn back
One of the causes includes poor arc ignition, unstable arc, poor wire feeding, cleanliness of the workpiece surface, etc., but it does not necessarily affect the performance of the contact tip itself. At this time, the welding failure is roughly related to the characteristics of the welding power source and the quality of the welding wire. , wire feeding effect, wire feeding hose and contact nozzle structure design. When the welding wire and the conductive point in the contact tip are constantly changing, its life is only half of that when the conductive point is stable.
3. Reasons for wire straightening and surface finish
The welding wire of the welding robot is often packaged in a barrel or a plate, and also has burrs or ribs, so it may affect the contact between the welding wire and the contact tip. When the welding robot is welding, the contact tip should be stably conductive under the premise Provides minimal friction. The life of the contact tip of dirty welding wire may be only one third of that of using clean welding wire; to judge the quality of welding wire, the degree of annealing stress relief of welding wire, the performance is how straightness is: the test feedback is 50mm from the front of the acrobatic welding gun nozzle, whether the welding wire can be automatically Bending, bending forward means the welding wire is too soft, bending at the back means too hard, the hard welding wire is the most expensive for the contact tip; secondly, whether the wire feeding hose from the wire feeder to the welding gun is bent will also cause the welding wire to be bent. camber.
Post time: Apr-24-2022
