What Needs To Be Verified After Replacing The Spot Welding Machine Electrode Head?

After the spot welding machine electrode head is replaced, the following aspects need to be verified:

·Welding appearance quality

·Weld spot shape: Observe whether the appearance of the weld spot is uniform and regular. Ideally, it should be round or oval, without sharp burrs or notches. If the shape of the weld spot is irregular, it may indicate that the electrode head is not installed properly and the electrode pressure is uneven, which may easily lead to insufficient welding strength in the future.

·Indentation depth: Check the electrode indentation on the surface of the weldment, and the depth should be moderate. Too deep an indentation indicates that the electrode pressure is too large, which not only affects the appearance of the weldment, but also may weaken the strength of the weldment itself; if the indentation is too shallow, it indicates that the welding energy is insufficient or the electrode and the weldment are in poor contact, and there is a risk of false welding.

·Welding strength

·Tensile test: Perform a sampling tensile test on the weld spot, use a professional tensile testing machine, slowly apply tensile force until the weld spot is detached, and record the maximum tensile force value of the weld spot, which must meet the strength requirements of the weldment design. For example, in the welding of thin plates on the car body, the tensile force of each weld spot must reach a certain value to ensure driving safety.

·Torque test: For welds that need to withstand torque, such as welding of motor shafts and gears, after replacing the electrode head, use a torque wrench to apply torque to the weld to test the torsion resistance of the weld to avoid loosening or falling off of the weld due to excessive torque during use.

·Welding parameter accuracy

·Current monitoring: With the help of a welding current monitor, check the actual current value during welding to ensure that it is consistent with the preset current. Excessive current deviation will cause the welding heat to be out of control, either the weld will not penetrate or the weld will be burned through.

·Time recording: Verify the welding time, accurate to the millisecond level, to ensure that the duration of each welding is in line with the process setting. Too long or too short a time is not conducive to the formation of high-quality welds.

·Electrode pressure verification: Use a pressure sensor to measure the actual pressure applied by the electrode to the weld, and compare it with the set standard electrode pressure to prevent welding defects caused by abnormal pressure.

·Electrode head working stability

·Continuous welding test: Carry out multiple continuous welding operations to observe the performance of the electrode head under high-frequency use, and check whether there is overheating, redness, excessive wear, etc. Overheating will not only damage the electrode head, but also cause fluctuations in welding quality.

·Spatter: Pay attention to the degree of spatter during welding. Excessive spatter means that the electrode head is in poor contact with the weldment, or the welding parameters are mismatched. It is necessary to fine-tune the parameters in time to ensure a smooth welding process.