How to ensure the repetitive operation accuracy of the welding robot?
The accuracy of the welding robot is affected by many factors, including the load of the robot arm, the wear of tools, the difficulty of welding workpieces, etc. In addition to using high-precision measuring instruments, the accuracy can also be compensated by welding auxiliary equipment and welding control system. And with the continuous improvement and development of welding robot technology, the error required by welding robot to weldment is relatively small.
1. Incorporate appropriative welding process
The appropriative welding process for welding robot shall be incorporated, and the part size, weld groove and assembly size shall be strictly regulated during programming. The dimension tolerance of general parts and grooves shall be controlled within ± 0.8mm, and the assembly dimension error shall be controlled within ± 1.5mm. The probability of welding defects such as porosity and undercut in the weld can be greatly reduced.
2. Matching auxiliary equipment to ensure accuracy
The assembly tooling with high accuracy is used to improve the assembly accuracy of the weldment. The welding positioner can drag the weldment to the welding range of the welding gun, which can reduce the distance between the weld and the welding gun. It is conducive to the welding gun to place just the welding material to fill the weld, and ensure that the weld is beautiful and firm. The automatic tracking technology of the weld is that the control system can accurately weld the weld by identifying the weld specification and adjusting the appropriate welding parameters by the control system.
3. Load capacity of welding robot arm
The welding robot can realize stable welding in harsh environment, which is benefited from the load capacity of the welding machine. If the weight of the weldment is controlled within the load capacity of the welding robot arm, the welding robot arm can stabilize the welding quality while ensuring the flexibility, and the robot arm can also realize accurate welding during the swing process.
4. Keep the equipment clean
The weld shall be kept clean. Before welding, it shall be ensured that there is no oil stain, rust, welding slag, cutting slag and other sundries. Weldable primer is allowed. Otherwise, the success rate of arc striking will be affected. The tack welding is changed from electrode welding to gas shielded welding, and the spot welding part is polished at the same time to avoid the slag shell or air hole left by the tack welding, so as to avoid the instability of the arc and even the generation of spatter.
5. Multi layer and multi track welding
Multi layer and multi pass welding is to deposit more than two welding layers to complete the welding of the whole weld. In this way, the heat input is small in the process of repeated operations, which can reduce the incidence of welding defects and ensure the accuracy in repeated activities.