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Tech: Introduction to the Principle of Spot Welding Machine

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Tech: Introduction to the Principle of Spot Welding Machine

  • Time of issue:2021-03-15

Tech: Introduction to the Principle of Spot Welding Machine

(Summary description)Spot welding machine, also known as resistance welding machine, is the principle of welding using the resistance heat generated by the welding point of the workpiece through the electric current.

  • Time of issue:2021-03-15
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Tech: Introduction to the principle of
  spot welding machine    Spot welding machine, also known as resistance welding machine, is the principle of welding using the resistance heat generated by the welding point of the workpiece through the electric current.
  When working, the two electrodes squeeze the workpiece, so that the two layers of metal form a certain contact resistance under the pressure of the two electrodes. When the welding current flows from one electrode to the other electrode, instantaneous thermal welding is formed at the two contact resistance points, and the welding current flows instantaneously along the two workpieces from the other electrode, forming a loop without damaging the internal structure of the workpiece to be welded.
  In the process of spot welding, clean the surface of the weldment and send it between the upper and lower electrodes, apply pressure to make it contact well; energize the contact surfaces of the two workpieces to be heated, and partially melt them to form a nugget; maintain the pressure after the power is turned off. The nugget is cooled and solidified under pressure to form a solder joint; the pressure is released and the workpiece is taken out.
  Spot welding process parameters such as welding current, electrode pressure, energizing time and electrode working surface size have a great influence on welding quality.
  The process of spot welding is to turn on the cooling water; clean the surface of the weldment, send it to between the upper and lower electrodes after precise assembly, pressurize to make it contact well; energize the contact surfaces of the two workpieces to be heated, and partially melt them to form a nugget; After electricity, the pressure is maintained, so that the nugget is cooled and solidified under pressure to form a solder joint; the pressure is released and the workpiece is taken out.
  Preparation and installation of weldments: Before welding steel weldments, all dirt, oil stains, oxide scale and rust must be removed. For hot-rolled steel, it is best to pickling and sandblasting the welded parts or use a grinding wheel to remove the oxide scale. Although the uncleaned weldment can be spot welded, the service life of the electrode is severely reduced, and the output power and quality of spot welding are reduced together. The thin-coated medium and low-carbon steel can be welded directly.

In addition, users can refer to the following process data when using:
  1. Welding time: When welding medium and low-carbon steel, the welder can adopt a strong standard welding method (instantaneous energization) or a weak standard welding method (long-term energization). Strong standard welding methods should be used in mass production, which can improve production efficiency, reduce power consumption, and reduce workpiece deformation.
  2. Welding current: The welding current depends on the size, thickness and contact surface of the weldment. Generally, the higher the conductivity of the metal, the greater the electrode pressure and the shorter the welding time. At this time, the required current density also increases.
  3. Electrode pressure: The purpose of the electrode applying pressure to the welded parts is to reduce the contact resistance at the solder joints and ensure the required pressure when forming the solder joints.
  Shenzhen Site Technology Co., Ltd. is a high-tech production enterprise integrating R&D, production and sales of automated welding equipment and power battery PACK line equipment. The professional technical engineering team provides customers with timely and perfect pre-sales and after-sales services.

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What should be paid attention to in the daily maintenance and maintenance of spot welding machine?
What should be paid attention to in the daily maintenance and maintenance of spot welding machine?
Correct operation and maintenance of the spot welding machine can not only extend the service life of the spot welding machine, but also ensure safety during use. Therefore, frequent maintenance and maintenance are very important. Then let Site Technology introduce to you how to do the daily maintenance and maintenance of the spot welding machine.
2021-12-02
What are the common problems in the welding of precision spot welders?
What are the common problems in the welding of precision spot welders?
Common problems in the welding of precision spot welders: the welding point is not penetrated, and the welding spatters, which makes the spot welder unable to weld. Therefore, in actual use of the spot welding machine, the following items should be paid attention to.
2021-12-02
The influence of the pressure of the intermediate frequency spot welder on the welding quality
The influence of the pressure of the intermediate frequency spot welder on the welding quality
In the actual intermediate frequency spot welding machine, adjusting the electrode pressure is one of the key parameters of spot welding. The nature of the workpiece adjusts the parameters and pressure. Excessive or too small electrode pressure will reduce the load-bearing capacity and dispersion of the solder joints, especially for tensile loads.
2021-11-18
Introduction to the workflow of automatic battery spot welding machine
Introduction to the workflow of automatic battery spot welding machine
One is to adjust the effective value of the welding current to make the heat of the internal power source change significantly; second, due to the concentration and contraction of the contact points of the two weldments during the operation of the automatic spot welding machine, concentrated heating occurs there , And the plastic junction area first seems to form unevenly during spot welding plus this unfavorable factor
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