There are many reasons why the welding robot burns nozzles. The nozzle is replaced frequently. The appearance is: the outlet of the nozzle is worn, which leads to the deflection of the wire feeding, and the actual welding track is shifted, that is, the position of the TCP point is shifted, resulting in welding deviation or welding leakage, etc. Welding defects occur. The main points are as follows:
1. Reasons for the failure of the contact tip itself
The nozzle of the welding robot itself is worn out. The welding robot originates from the wear at the outlet of the nozzle due to the friction of continuous wire feeding under the rising temperature of the nozzle. When the welding robot welds, it often leads to calibration errors and affects production efficiency. We should try to reduce the temperature of the nozzle, including the composition of the nozzle and the processing of the nozzle structure of the welding robot. The material of the nozzle: brass, red copper, chrome zirconium copper is the best; even ceramic components are added to the nozzle to increase the Abrasion resistance. Again, 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 welding robot nozzle are not good enough.
2. The arc is unstable, causing the arc to burn back
One of the causes of the welding robot includes poor arc ignition, unstable arc, poor wire feeding, and cleanliness of the workpiece surface, etc., but it does not necessarily affect the performance of the nozzle itself. At this time, the welding failure is roughly related to the characteristics of the welding power source, Welding wire quality, wire feeding effect, wire feeding hose and structure design of nozzle, etc. When the conductive point from the welding wire to the nozzle is constantly changing, its life is only half of that when the conductive point is stable.
3. Reasons for wire straightness and surface finish
Welding robot welding wires are often packaged in cylinders or disks, and also have burrs or ribs, so it may affect the contact between the welding wire and the nozzle. friction. The life of the nozzle when the wire is dirty may be only one-third of the clean wire; to judge the quality of the wire, the degree of annealing stress relief of the welding robot wire, the performance is how straight it is. The test is: 50mm in front of the acrobatic welding torch Whether the welding wire can be bent automatically, bending forward means the wire is too soft, bending at the back means too hard, the hard wire is the most expensive for the nozzle; secondly, whether the wire feeding hose from the wire feeder to the welding gun is bent, It will also cause the wire to bend.
Improvement measures for welding robot nozzles
1. Purchase chrome-zirconium-copper nozzles, big brand products with guaranteed machining accuracy.
2. Welding robot wire straightening.
3. The nozzle of the welding robot must be tightened with pliers. It is not enough to only screw it by hand, the arc is unstable, and the nozzle is more expensive!
4. The welding robot gun cleaning workstation is normal, and the anti-spatter silicone oil is sprayed.
5. Generally, a smaller voltage is used, and the approximate formula 14+0.04*current is selected. The voltage is high and the loss is large.
6. The welding robot should clean the wire feeding pipe frequently.
7. The quality of the welding robot wire is also a decisive factor.
Post time: Aug-19-2022
