Hf Welder for Carbon Steel Pipe Seam Welding

Besides the traditional solid state high frequency welder, our company has successfully developed new type of high power factor rectification technique for new generation solid state HF welder. The three-phase full-bridge rectifier circuit composed of six thyristors is stable and reliable. Most of the existing solid-state high-frequency circuits in China adopt this technology, and it is widely used in the welding of steel pipes and aluminum bars. However, there are also disadvantages of low power factor and serious harmonic pollution.
Because of silicon controlled rectifier device adopts the phase shifting control, power regulation is by changing the trigger angle and voltage regulation, circuit from the grid to absorb the sine wave is lack of angle, and leave the grid is also part of the sine wave, obviously in the left part contains a large number of harmonics, at the same time because of different voltage and current phase, resulting in low power factor, the lower the DC output voltage, The lower the power factor).

The theoretical calculation and test show that when the trigger Angle of the three-phase fully controlled rectifier bridge is 0, or the uncontrollable bridge composed of diodes is used for rectifier, the harmonic generated by the bridge is very small and the power factor is very high (more than 0.9). However, in practice, continuous DC voltage regulation (that is, output power regulation) is required, and the HF welder cannot always be working at full voltage condition. In order to make the induction welder have the minimum harmonic, the highest power factor, and the output power adjustable function, we must add additional voltage regulating device behind the uncontrollable rectifier bridge, that is, separate the rectifier and voltage regulating.
Three-phase power frequency of the three-phase uncontrolled consisting of alternating current (AC)through the diode bridge rectifier bridge into DC, and flat DC voltage generated by the large capacitor filter group, theh adopt high power switch module IGBT to realize on-off control. In the case of constant switch frequency, by adjusting the percentage of time of on-off, we can control the output DC voltage average value. This is pulse width modulation technology (for short as PWM or chopper technology). PWM chopper modulation generated width variable pulse DC, through reactance or capacitor filtering, can provide to the load with fast, stable and adjustable DC voltage and current.

The solid state HF welder, rectifier and inverter produced by our company are controlled by microcomputer, and matched with other peripheral devices. All control components are integrated in two circuit boards (rectifier board & inverter board, one for each). On the basis of giving full play to the powerful functions of computer hardware and software, the best regulation of rectification and inverter is realized. Compared with the vacuum tube type high-frequency equipment, it has the following advantages:

1. Good welding quality: It shows that the weld width and heat of the steel pipe are uniform and the inner and outer burrs are less compared with vacuum tube type high-frequency equipment.
2. Energy saving: The test shows that our solid state induction welder is more than 25% energy saving than the same specification of electron tube equipment.
3. Water saving: because of its own small loss, does not need too much cooling water, so the water consumption is more than 50% less than the same specification of vacuum tube equipment.
4. Small size, light weight: because the main power devices (MOSFET) are very small, there is no such as welding transformer, filament voltage regulator, matching coil, gate circuit and other devices, the overall volume is 50% smaller than the same specifications of the tube equipment.
5. Easy to operate: that is you can start and stop the machine as your wishes.There is no need for vacuum tube preheating, and no need to continue cooling after welder shutdown.

Use safety: the electronic tube is a high voltage device, working at a high voltage of tens of thousands of volts, and the MOSFET is a low voltage device and works in the equivalent parallel resonance state, the highest voltage peak is not more than one thousand volts, generally will not cause personal injury.

1. Q:Are you manufacturer?
    A: Yes, we are manufacturer and trading company. We have our own technical team, and about 45000 sq.m workshop. Welcome to visit us .

2. Q:What kind of information you need before you give quotation?
A: The pipe diameter and thickness range which you gonna make or the profile drawings, material information, and your other special requirements.

3.Q:What kind of payment terms you can do ?
A: We are flexible about payment terms,such as T/T, L/C. we can help you on financing also,please contact us for details.

4. Q: Can your factory customize the machine for clients ?
   A: Yes, we can.

5. Q:How do you do QA?
   A : We have team do strict QA.

1. Every gearbox will be tested for 8 hours with oil inside to guarantee there is no leak.
2. Every shaft will be inspected for the centering jumpiness.
3. Every roller will be checked to make sure its tolerance, critical parts will be inspected for all dimensions.
4. For HF welder, we will do factory commissioning and will test all the protection functions.
5. For Flying computer saw, the factory inspection will also be proceeded before shipment.

6. Q: What is the warranty time for your ERW pipe machine?
   A: warranty period of ERW pipe mill : 12 months after commissioning.

7. Q: How about after-sales service ?
   A: We will send professional engineers to final customer's factory for machine installation , commissioning and carefully working training . The final customer will afford related cost.

8. Q:Why should i choose you? What's the difference between you and other Chinese supplier?
A: We are concentrating on this pipe mill field for more than 15 years.We have professional researching, designing, processing, testing and after-sales service teams. Our pipe making machine lines have been exported to many countries , such as Turkey, Russia, Egypt, Vietnam etc.

9. Q:What should i do if i just start a new business ?
    A: contact us immediately, we can provide pre-sales consultant service free of charge.