Solid State HF Contact Welder

Detailed Description

Brief Introduction
This equipment mainly used in the field of carbon steel tube & pipe welding and special section tube & pipe welding. The whole set of this equipment consists of rectifying cabinet, inverter cabinet, central control console, step down transformer, DC speed adjust unit and cooling system.

The basic principal of solid state high frequency is that 3-phase AC current voltage is reduced by the step down transformer, and then enter into the rectifying cabinet through the rectifying, regulating voltage and filtering and become continuously adjustable DC; then enter into the inverter bridge(using high-power transistor MOSFET) and become high frequency current, and this high frequency is suppliedto the load tank circuit and then can be used for the induction heating. Inverter tank circuit power unit using the modular structure, and each power unit can output above 50KW, the number of the power unit is different according to different power equipment. The tank circuit is a kind of series and parallel mixing form, no high voltage and no output transformer.

Equipment Advantages

1.No high voltage, safety, reliability and high efficiency.
2.The main components are using foreign brands products, such as: IR, IXYS and Siemens.
3.Voltage and Current Double-fed control circuit, stable adjustment, high precision and little interference.
4.Power range 0-100% step-less adjustable, have the advantages of over-voltage, over-current etc. fault protection system.
5.Digital display, simple operating, convenient maintenance.
6.High quality welding, uniform welding seam width, uniform temperature, less burrs in welded tube surface and inner.

The main technical parameter:-

Application Operating parameters Power supply requirements
Pipe diameter Φ165-Φ508 Rated power 800KW Supply form 3-Phase four-wire AC line voltage 380 ±5%
Steel Strip thickness 6.0-16.0 Rated DC voltage 240V
Welding Induction welding Contact welding Rated DC current 4000A Power Capacity ≥1000KVA
Rated frequency 200KHZ Power Factor ≥0.85
Welding speed 60-100(m) Overall efficiency ≥85% Power cables PPlastic copper per phase ≥800mm² Ground ≥400mm²
Output HF frequency power ≥85% ≥800KW

Operating Environment

This equipment is designed for indoor installation, should avoid the rain, frost and snow, sun exposure, it should also meet the following conditions:

1.No more than 1000 meters altitude, too high altitude will reduce the air pressure result in bad cooling effect.
2. Ambient temperature -5 ℃ --- + 40 ℃, (less than 0 ℃ should prevent freeze, result in the cooling pipe blocked and damaged).
3. Relative air humidity less than 85%.
4. No conductive dust explosion, no gas and steam can rust the metal and damage the insulation.
5. No severe vibration and shock

If does not meet the above-mentioned requirements, the customer should notified our company and we can consider carefully in the equipment design.