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Techniques for using automatic diameter-changing roll welding machines
Publish Time：
2022-06-17 09:49
Automatic variable diameter roll welding machines can form uniform and continuous weld points on products, which can overlap each other to achieve a sealing welding effect. Therefore, the factors affecting the welding quality of automatic variable diameter roll welding machines are also roughly the same. They are widely used in the welding of automotive fuel tanks and heat sinks. The welding principle of automatic variable diameter roll welding machines is basically the same as that of spot welding machines, mainly including: welding current, electrode pressure, welding time, rest time, welding speed, and roll diameter, etc. So, let's learn about the usage skills of automatic variable diameter roll welding machines!
Automatic variable diameter roll welding machines can form uniform and continuous weld points on products. These weld points can overlap to achieve a sealing welding effect. Therefore, the factors affecting the welding quality of automatic variable diameter roll welding machines are roughly the same. They are widely used in the welding of automotive fuel tanks and heat sinks. The welding principle of automatic variable diameter roll welding machines is basically the same as that of spot welding machines, mainly including: welding current, electrode pressure, welding time, rest time, welding speed, and roll diameter, etc. Let's learn about the usage skills of automatic variable diameter roll welding machines!
Five usage methods of automatic variable diameter roll welding machines:
1. Welding current: Like a spot welding machine, the welding principle of an automatic variable diameter roll welding machine also uses the welding current to generate resistance heat through the welding area. Resistance heat is the main heat source for weld formation. Under given other conditions, the magnitude of the welding current determines the penetration rate and repetition rate of the weld. To obtain a good sealing welding effect, Sunar engineers recommend that the weld overlap should not be less than 15-20%. Usually, the welding current of an automatic variable diameter roll welding machine is 15-40% larger than that of spot welding, but it cannot be too large. When welding low-carbon steel, the average penetration rate of the weld is 30-70% of the steel plate thickness, with 45-50% being appropriate. If the welding current of the automatic variable diameter roll welding machine is too large, it will cause an increase in the penetration rate and repetition rate of the weld core weld seam, the joint strength cannot be improved, and defects such as excessive indentation will occur.
2. Electrode pressure: Excessive electrode pressure will cause excessive indentation and accelerate the deformation and wear of the roller; insufficient pressure is prone to shrinkage. The electrode pressure of the automatic variable diameter roll welding machine is one of the important influencing factors of the weld size and consistency, causing spatter, damaging the roller electrode, and shortening its lifespan.
3. Welding time and rest time: When the welding speed increases, the distance between welding points increases. To obtain the same repetition rate of welding, the ratio must be increased. Welding time controls the weld size, and cooling time controls the weld overlap. For lower welding speeds, the welding time is recommended to be 1.25 to 2 times the rest time. In this case, the welding time is usually more than 3 times the stop time.
4. Welding speed: The setting of the welding speed is related to the material of the product to be welded, the thickness of the plate, and the requirements for welding strength and quality. A lower welding speed must be used. In special cases, a stepping roller model can also be used to complete the entire process of weld formation while the roller is stopped. Usually, when welding stainless steel, high-temperature alloys, and non-ferrous metals, in order to avoid splashing and obtain a well-sealed weld, that is, compared to spot welding, the welding speed of this roll weld is much lower than that of ordinary intermittent welds.
5. Roller diameter: The welding speed of the automatic variable diameter roll welding machine determines the contact area between the roller and the backing plate, as well as the contact time between the roller and the heating part, thus affecting the heating and heat dissipation of the joint. When the welding speed increases, in order to obtain sufficient heat, the welding current is increased. When the welding speed is too high, it will cause burning of the baking plate surface and electrode adhesion. Therefore, even with external water cooling, the welding speed will be limited. Stable welding current can maximize the welding technology, the welding texture is clear, uniform, and uniform, and welding technology is an important application of resistance welding technology, especially in the field of sealing welding has great advantages. The medium-frequency inverter welding machine uses a medium-frequency inverter control power supply, three-phase 380V input, power grid balance, and a 1000HZ rectangular wave form DC output after inversion and rectification.
The above is an explanation of the usage skills of automatic variable diameter roll welding machines. To produce better welded products and create more well-known national industrial brands, we can leave footprints step by step. In order to master better welding machine usage technology and exert greater welding advantages of the welding machine.
Automatic diameter change roll welding machine
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