Energy storage and inverter LPG Cylinder Spot Welding Machine
There are significant differences between energy storage type and inverter type LPG cylinder spot welding machines in terms of energy storage methods, output characteristics and application scenarios. The specific differences are as follows:
1. Energy storage and conversion principle
Energy storage: pre-charge and store electrical energy through large-capacity capacitors (usually 10⁴-10⁵μF ), and instantly release high pulse current (peak value can reach 80-120kA ) during welding, which belongs to " storage energy first and then discharge" Mode. Its transformer is designed for industrial frequency ( 50/60Hz ), with a simple structure, but it needs to be equipped with a rectifier circuit to convert AC power into DC power for storage.
Inverter type: IGBT power devices are used to invert 50Hz industrial frequency electricity into high-frequency (1-20kHz) AC power, which is output after being stepped down by a high-frequency transformer. The energy conversion efficiency reaches 85%-90% (about 60%-70% for energy storage type). No large-capacity capacitors are required, and the current waveform is directly controlled by the inverter, with a faster response speed (millisecond-level adjustment).
2. Welding characteristics and parameter control
Energy storage type: high current peak value, short duration (1-5 cycles), suitable for welding steel cylinders with a thickness of 1-4mm, especially in the welding of materials with fast thermal conductivity such as galvanized sheet and aluminum alloy, which can reduce the heat affected zone. However, the current waveform is single, it is difficult to achieve precise segmented adjustment, and the aging of the capacitor will cause energy attenuation (about 5%-10% per year).
Inverter type: supports dynamic waveform adjustment (such as square wave, ramp wave), can accurately control the current rise rate and welding time (accuracy up to 0.1 cycle) through PID algorithm, suitable for multi-layer boards (≤6mm) or dissimilar metal welding. For example, when welding 3mm carbon steel bottles, you can set the three-stage current of "preheating-main welding-tempering" to reduce the risk of weld cracks, and the electrode life is extended by 20%-30% compared with the energy storage type.
3. Applicable scenarios and device features
Energy storage type: suitable for small and medium-sized batch production or scenarios that require portability (such as on-site maintenance). The equipment is large in size (about 1.5m³), but is not sensitive to grid fluctuations (allowable voltage deviation ±15%), and the energy consumption per single welding is low (about 0.5-1kWh/time).
Inverter type: more suitable for automated production lines, supports multi-axis linkage welding (such as circumferential seam and spot group welding), small equipment size (about 0.8m³), but high requirements on power grid quality (voltage stabilizer is required), and electromagnetic compatibility (EMC) design should be paid attention to when working at high frequency to avoid interference with surrounding equipment.
Summary: The energy storage type has the advantages of high pulse energy and resistance to grid fluctuations, while the inverter type is known for precise control and high efficiency energy saving. Enterprises can choose the appropriate type according to the thickness of the cylinder, production efficiency and process complexity.
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