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What Materials Are Generally Used For Spot Welding Electrical Resistance Welding?
Nov 16, 2018

The object of resistance welding of spot welder is mostly ferromagnetic material such as iron and steel. When the workpiece enters the electrode arm of the welder, the inductance of secondary circuit will change, resulting in the instability of welding current, which will lead to the fluctuation of welding quality.  In resistance welding of AC spot welder, the strong welding current disturbs the electrode arm by alternating electromagnetic force, which leads to the instability of electrode pressure and affects the welding quality. 8594 (This is the characteristic of low operating cost of medium frequency inverted spot welding machine. 85 Due to the limitation of working frequency (50Hz), the minimum adjusting period of welding current also needs 20ms (that is, one cycle); The working frequency of medium frequency inverter welding power source is 1000Hz, 4000Hz, 8000_Hz, and the minimum adjusting period of welding current is only 1ms or 0.25ms, 0.125ms(one cycle); (The medium frequency inverter provided by us) The highest frequency of power source inversion can go to 8KHZ). Therefore, the medium frequency inversion welding power source can control the current output more accurately, and the output of the medium frequency inversion spot welding machine is the DC current with very small ripple and no zero-crossing effect. Therefore, the quality of light alloy, heat-resistant steel, precision parts, high-speed seam welding and welding is very important. There are irreplaceable advantages in seeking high places. On the contrary, the DC current with very small output ripple of the inverted welder has a "clustering effect" to the center when it passes through the welding zone. The intermediate frequency inverter spot welder can heat the welding heat and reduce the heat affected zone around the solder joint. This feature is particularly important for the welding of multi-layer and thick plates; 2. Because of the clustering effect of DC welding current and no zero-crossing effect, the welding current used in the spot welding machine with medium frequency inversion can be reduced by 25%-30% compared with that of AC welding under the same welding conditions; (This is the spot welding machine with medium frequency inversion). One of the features of low operation cost is that the requirement of electrode cooling of medium frequency inverted spot welding machine is reduced, which can reduce the consumption of cooling water; (This is the second feature of low operation cost of medium frequency inverted spot welding machine); (4) The clustering effect of DC welding current of medium frequency inverted spot welding machine seldom produces welding spatter and improves the service life of electrode. More than 1 times life, and save the electrode grinding time, improve production efficiency.