The parameters for used HFW pipe units depend on the high-frequency welding. If you want to make a good welded pipe, you must look at the parameters of the second-hand high-frequency pipe welding machine. This is the question, what parameters are called the key parameters of high-frequency welding in used HFW pipe units? Now to answer your doubts, that is welding power and efficiency.

Welding power and efficiency

Power

Usually for high-frequency welding, the welding power is relatively constant for a specific specification of pipe at a specific speed. The main reasons for its variability come from other related parameters to be discussed below, such as Vee angle size and length, stability, parallelism of steel strip edges, size of induction heating coils, frequency of high-frequency welding, and impedance in actual production. characteristics and cooling effects at the frequencies used in . Different frequencies can also have a significant effect on the welding power for that particular condition. We'll talk about it below.

For the actual production of used HFW pipe units, the determination of welding power or welding machine power should be based on various factors, such as production line speed, extrusion roller diameter, welding frequency and so on. The different expectations of the production speed to be achieved when welding the largest pipe diameter and the largest wall thickness also have a significant impact on the choice of welding machine power. This expectation usually directly leads to huge changes in the power configuration of the welding machine, and also puts pressure on the total investment budget. The efficiency of different types of welding machines and the different definitions of power positions will affect the actual configuration of the rated power of the welding machine.

Effectiveness

The concept of efficiency is divided into two types: ① The efficiency of the welding machine is the utilization rate of the power supply. Generally speaking, the efficiency of traditional oscillating pipe welding machines is generally between 45% and 60%. The solid-state welding machine (transistor welding machine) has a different basis for generating high frequency (inverting), and the equipment efficiency can be increased to 75~90% compared with the oscillating welding machine.

②Conversion efficiency. that is the high-frequency inverter transmits power to the load through the output transmission bus (low impedance load is directly driven, a typical characteristic of current-mode loop) or impedance transformation through the output transformer (converts the low-impedance induction coil load into The acceptable high impedance of the inverter system, which is the main purpose of using the output transformer, is also a typical feature of the voltage-type output circuit. The isolation is only its additional effect and has little practical significance) to convert this power into a direct effect on the actual production. The heating power of the strip edge in the Vee corner opening area of the active strip. The efficiency is greatly affected by the transmission bus or output transformer, equipment welding frequency and external parameters. Even under the most appropriate external conditions, the power loss of the transmission bus is about 3~5%, and the power loss of the output transformer is 5~8%. The power output from the induction coil becomes the actual power required for welding, and its power loss also exceeds 3~8%. And as the diameter of the pipe increases, the loss increases.

Effect of 250kw induction welding power on efficiency/speed at different welding frequencies

Compared with the welding frequency of 300khz and 200khz, under the premise of induction welding and the same output power of 250kw, the 300khz equipment will increase the welding speed by about 10% compared with the 200khz equipment.

That is to say, under the same welding power or the same power consumption, 300khz frequency can obtain 10% more output than 200khz.

6 hours a day, the annual production time is calculated according to 300 days, and the 76mm steel pipe is calculated with a wall thickness of 3.5mm. Under the same factory cost, the production of steel pipes is 0.29~0.34 million tons less.

Effect of 450kw induction welding power on efficiency/speed at different welding frequencies

Compared with the welding frequency of 300khz and 200khz, under the premise of induction welding and the same output power of 450kw, the 300khz equipment will increase the welding speed by about 10% compared with the 200khz equipment.

That is to say, under the same welding power or the same power consumption, 300khz frequency can obtain 10% more output than 200khz.

6 hours a day, the annual production time is calculated according to 300 days, and the 219 steel pipe is calculated with a wall thickness of 6mm. Under the same factory cost, the production of steel pipe is 11,000 to 12,000 tons less.

Effect of 450kw contact welding power on efficiency/speed at different welding frequencies

Compared with the welding frequency of 300khz and 200khz, under the premise of contact welding and the same output power of 450kw, the 300khz equipment will increase the welding speed by about 10% compared with the 200khz equipment.

That is to say, under the same welding power or the same power consumption, 300khz frequency can obtain 10% more output than 200khz.

6 hours a day, the annual production time is calculated according to 300 days, and the 219 steel pipe is calculated with a wall thickness of 6mm. Under the same factory cost, the production of steel pipe is 24,000 to 26,000 tons less.

The above data tells us that the welding frequency is reasonably positioned according to the actual welding products of the used HFW pipe units, and the welding equipment can be stably operated at a suitable working frequency, which can effectively improve the production efficiency by 10%.

Any time the welding frequency permits, higher frequencies will be more energy efficient and more efficient than lower frequencies.

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