Recently, many friends have found us through the Internet and consulted the same problem: the lithium battery spot welding machine used by the company is not well welded, the welding is not firm, and many undesirable phenomena such as virtual welding and explosion welding occur from time to time. How to avoid such a problem, but also to the friends who need to choose some reference, Bicester Automation hopes to do its best to help friends who are lucky enough to see this article to avoid pits!
We need to understand the reasons why the resistance welder is not strong from the root, and in general, there are the following points, which we can investigate one by one:
1. The spot welding machine is a type of welding power source, and how big is the welding current of the welding power supply?
The welding power supply of spot welding machine is: AC, DC and transistor.
I believe that when you choose a spot welding machine, the manufacturer will tell you what the maximum thickness of the welding nickel sheet is, but it is not excluded that some manufacturers exaggerate their machines and tell you that the welding thickness is false. So try to take our products to try the welding effect of the machine before buying the machine.
The transistor welding power supply is the best of all welding power sources, with the most stable discharge current and the most accurate waveform control. Welding power discharge current (You can know how big the discharge current of the spot welding machine is, because the size of the welding current determines the thickness of the nickel sheet welded by the machine.) Unstable will lead to the appearance of undesirable phenomena such as virtual welding, missing welding, and explosion welding.
2. Adjust the parameters of the spot welding machine and the pressure of welding.
The main adjustment parameters are voltage, current, and welding time.
If the nickel sheet is thinner, the current should be reduced, and the current should be increased if the nickel sheet is thicker.
According to the material adjustment parameters of nickel sheets, there are two common welding materials on the market, pure nickel and steel nickel plating, the resistance of pure nickel material is small, and the energy loss is large after the current arrives, so it is necessary to adjust the current for welding. Steel is nickel-plated and easy to weld.
Adjust the parameter data according to the thickness and material of the nickel sheet.
The amount of pressure in the welding is also crucial, and the adjustment of the pressure can change the resistance.
Based on the above according to the thickness and material of the nickel sheet to adjust the welding capacity of the spot welding machine, then the welding effect will be twice the result with half the effort.
3. The surface of the welded product should be kept clean and tidy without oil stains, and the welding surface of the welding pin should be polished regularly, otherwise it will hinder the full arrival of the welding current.
Fourth, how to improve the welding firmness of lithium-ion battery high-speed automatic spot welding machine.
1. Choose the right electrode material.
The electrode material is one of the important factors affecting the firmness of welding. In general, electrode materials need to have high electrical conductivity, high thermal conductivity, and good corrosion resistance. At present, commonly used electrode materials are copper, molybdenum, tungsten, etc. Among them, copper is the most commonly used electrode material, because it has excellent electrical and thermal conductivity, and is also relatively corrosion-resistant.
2. Control the welding temperature and time.
Welding temperature and time are two other important factors that affect the firmness of welding. Generally speaking, too high or too long a welding temperature will cause a change in the material structure at the solder joint, resulting in a decrease in the firmness of the weld. Therefore, in actual operation, it is necessary to control the welding temperature and time according to the specific material and process requirements to avoid too high or too long a situation.
3. Keep the surface of the electrode and material clean.
During spot welding, contaminants on the electrode and material surfaces can reduce the firmness of the weld. Therefore, before spot welding, the electrode and material surfaces need to be cleaned to ensure that the welded surfaces are fully in contact and bonded. At the same time, during the welding process, the welding equipment needs to be cleaned regularly to keep the equipment clean and stable.
4. Improve the degree of automation of equipment.
Improving the degree of automation of the equipment can effectively improve the welding firmness. Automation equipment can realize automatic control and monitoring of the welding process by controlling welding parameters and testing welding quality. At the same time, the automation equipment can also greatly shorten the production cycle and improve production efficiency, thereby reducing the welding quality problems caused by human error.
The above is a summary of the reasons for the unstable welding of spot welding machines, I hope it can help you for reference! More questions, welcome**!