Laser spot welding machine, also known as resistance welding machine, is usually divided into three categories according to the nature of the welding power source: 1. AC spot welding machine; 2. Energy storage spot welding machine; 3. DC spot welding machine.
1. AC spot welding machine
Precision AC spot welding machine generally refers to the power of 16KVA below the spot welding machine, to the desktop type, usually divided into foot pedal and pneumatic two, this welding machine using AC discharge, and on this basis, respectively, the use of single pulse, multi-pulse, frequency, time, program and other control methods. It can also implement single-point welding, continuous welding automatic control, and manual control, with complete specifications. It is mainly used for the welding of tungsten, molybdenum, iron-nickel, aluminum, stainless steel, silver and other metal sheets, wires and bars.
High-power AC spot welding machine generally refers to the spot welding machine with a power of more than 16KVA, mainly vertical pneumatic, high-power AC spot welding machine performance characteristics: direct pressurization mechanism, good follow-up performance, fast welding speed, long service life, low noise Safety, easy to use Water-saving forced cooling method High firm strength body structure Upper insulation is simple and practical The main circuit adopts high-power SCR contactless switch High conductivity, low power loss In the secondary current circuit of the domestic AC spot welding machine, The upper secondary output of the main transformer adopts multi-layer high-toughness, high-conductivity copper soft belt, and is connected in a U-shape. The service life is greatly improved, and the next secondary output adopts an integrated direct connection mechanism, and the current loss is minimized. The main circuit of the king AC spot welding machine adopts water-cooled high-power thyristor components, and the output power supply is strong, stable and reliable. It has stiffness to resist shock and vibration, and prevents the electrode tip from slipping during pressurization, enabling stable welding. It is mainly used in hardware, electromechanical, and automotive industries. The welding precision and welding performance of the AC machine are higher than those of the energy storage machine.
2. Energy storage spot welding machine
Precision energy storage spot welding machine, this series of spot welding machine adopts capacitive energy storage charge and discharge welding, which has the characteristics of small impact on the power grid, concentrated welding current, fast discharge speed, strong penetration, and small heat affected zone on the welding surface, and is suitable for the welding of copper, nickel, stainless steel, iron and other metal sheets, wires and rods. As well as the welding of various small relays, low-voltage electrical appliances and reeds, silver contacts and copper wires.
High-power energy storage spot welding machine generally refers to the energy storage spot welding machine with a power of more than 800J (joules), Features: Wide use, in addition to general soft iron, stainless steel, copper aluminum, alloy and general non-ferrous metals can be welded, and the welding performance is excellent. Since the output and input are completely separated, they are not affected by changes in the external power supply, maintaining a constant power output.
The product performance is a little worse than that of DC and AC machines, and the appearance and welding firmness of the solder joints are OK, which is suitable for the processing of products with low appearance requirements. The disadvantages are: energy storage, energy storage, as the name suggests, is to store the electricity in the capacitor of the equipment first, it needs to be charged before each discharge, and the capacitor needs to be replaced after the equipment is used for a period of time.
3. Inverter DC spot welding machine
The principle of the DC spot welding machine is to reverse the alternating current into direct current for welding through technology.
As we all know, the electricity we use, whether it is household or factory electricity, is alternating current, that is because the advantage of alternating current is easy to transport and cheap cost, its advantage is the disadvantage of direct current, its disadvantage is the advantage of direct current, they are complementary, direct current is more stable and safe than alternating current used in equipment. Like the AC machine, the DC machine is also mostly table-top, usually divided into foot pedal and pneumatic two, the welding machine uses DC discharge, and can use various control methods such as single pulse, multi-pulse, frequency, time, etc. It can also implement single-point welding, continuous welding automatic control, and manual control, with complete specifications. It is mainly used for the welding of tungsten, molybdenum, iron, nickel, aluminum, copper, stainless steel, silver and other metal sheets, wires and bars.
Compared with AC and energy storage welding machines, the advantages of DC welding machine are: compact structure, smaller volume, strong overload capacity, low energy consumption, superior performance, and higher welding precision. The disadvantage is that compared with the first two welding machines, its cost is a little more expensive.
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