FAQ

Resistance welding is a welding method in which the workpiece to be welded is pressed between two electrodes, and the current is used to generate heat on the contact surface of the workpiece and the resistance in the adjacent area, and heat it to a molten or plastic state to form a metal bond. . With its unique advantages, resistance welding is widely used in aerospace, electronics, automobiles, household appliances and other manufacturing industries. There are four main resistance welding methods: spot welding, seam welding, projection welding, and butt welding.

Resistance welding is suitable for mass production, with high production efficiency and no noise and harmful gases; simple operation, easy to realize mechanization and automation; low welding cost, no welding materials such as filler metal; small stress and deformation, short heating time, and concentrated heat; The metallurgical process is simple. When the nugget is formed, it is always surrounded by a plastic ring, and the molten metal is isolated from the air.

The core of resistance welding are the three major elements of welding current, pressure, and energizing time, all of which are indispensable. Model selection according to the material and thickness of the workpiece.

Welding current is an important factor in generating heat. The formula is Q=I²Rt. It can be seen that the influence of current on heat generation is greater than both the resistance R and the time t. Therefore, the proper and stable welding current must be ensured during welding. If the welding current is too small, the welding part will not have enough heat, which will seriously affect the welding strength. If the welding current is too large, the welding part will be deformed, the surface will become dirty, the molten metal will splash, and bubbles will be generated.

The Importance of Spot Welding Machines in Stainless Steel Manufacturing

The Importance of Spot Welding Machines in Stainless Steel Manufacturing The spot welding machine applies pressure to the weldment through the electrode, and uses the resistance heat generated when the current passes through the weldment to achieve welding. When welding stainless steel parts, the instantaneous high current will generate high temperature at the contact point, causing the stainless steel material to melt locally and form a weld spot, thereby achieving connection.   Advantages of welding stainless steel parts High-precision weldingIt can achieve precise spot welding position and welding volume control to ensure the dimensional accuracy and welding quality of stainless steel parts.For example, in the welding of stainless steel parts in precision instruments, the spot welding machine can ensure that the position deviation of the weld is extremely small and does not affect the overall performance of the instrument.Efficient productionThe welding process is completed quickly, greatly improving production efficiency.For enterprises…
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Structure of Nut Electrode of Intermediate Frequency Spot Welder

Structure of Nut Electrode of Intermediate Frequency Spot Welder The nut electrode of the intermediate frequency spot welder is the lower electrode and the upper electrode, and the lower electrode locates the workpiece. Generally, the workpiece is held from the bottom to the top, and it has a positioning and fixing effect. The workpiece needs to be pre-opened at the spot welding nut and opposite to the nut. The insulation is provided with a positioning pin extending upward from the hole into the nut to position the nut. To ensure the insulation of the positioning pin, the positioning pin cannot extend out of the nut to ensure smooth spot welding of the nut. The positioning pin is generally set on the lower electrode through an insulating layer. After multiple uses, the insulating layer will cause wear and tear to make the positioning pin come out, affecting the normal use of…
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Welding Stress Change and Curve of Intermediate Frequency Spot Welder

News & Technicals Welding Stress Change and Curve of Intermediate Frequency Spot Welder In the early stage of the intermediate frequency spot welder, due to the welding pressure, the crystal grains in the crystallographic direction and the stress direction are the first to cause movement, and as the welding current cycle continues, the welding spot displacement appears. Until the displacement of the solder joint cannot be restored, this phenomenon is called the accumulation of the solder joint position, followed by the occurrence of shear microcracks on a certain displacement surface. At the beginning, the microcracks of the displaced weld nugget stop at the grain boundaries of the grains, and the cracks begin to expand when the local plastic deformation of the adjacent grains exceeds a certain critical value. Under the microscope, the weld nugget of the intermediate frequency spot welding machine is observed in the cross section of the initial…
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Analyze the Electrode of the Intermediate Frequency Spot Welder

News & Technicals Analyze the Electrode of the Intermediate Frequency Spot Welder Intermediate frequency spot welders need to be equipped with electrodes to complete the welding work during operation. The quality of the electrodes directly affects the quality of the solder joints. The electrodes are mainly used to transmit current and pressure to the workpiece, but the poor selection of electrode materials will be in the process of use. The medium wear is aggravated, which will increase the grinding time and waste raw materials. Therefore, the electrode should be selected according to the material to be welded.The electrode must have a certain high temperature hardness, especially at 5000-6000 ℃, the hardness can still be guaranteed, because the higher the high temperature hardness, the less likely the electrode is to pile up during the welding process. Generally, the temperature of the contact between the workpiece and the electrode during welding is…
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Analyze the Influence of the Welding Point Distance of the Spot Welder

News & Technicals Analyze the Influence of the Welding Point Distance of the Spot Welder In the continuous spot welding of the intermediate frequency spot welding machine, the smaller the spot pitch, the thicker the sheet, and the greater the shunt. If the material to be welded is a light alloy with good conductivity, the shunt is more serious. The minimum point pitch is mainly to consider the effect of shunting. When using strong conditions and large electrode pressure, the dot pitch can be appropriately reduced. When using thermal expansion monitoring or a controller that can sequentially change the current at each point, and other devices that can effectively compensate for the effect of shunting, the dot pitch can be unlimited.   The influence of welding sequence: When the welded points are distributed on both sides, the flow split on both sides is larger than the split flow on only…
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