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High-power 38A MOSFET-IXYS, 60A fast recovery diode-IXYS, Multi-language operation menu, Speed-power closed loop control - details see: https://www.machineto.com/1800kw-rectangular-erw-steel-pipe-solid-state-hf-welding-machine-10143536

1. Application of 1800kW steel tube/pipe welding machine

Pipe specification: 508~660mm

Pipe specification: 20~26’’

Pipe thickness: 10~25mm

Pipe type: Round /square /rectangular

Welding mode: Induction/contact welding

Welding speed: 8~25m/min

2.Main Technical Index of 1800kW Solid State H.F. Welder

2.1 Designed parameters

Nominal power:1800kW

Rated DC power: P_d=2160kW

Rated DC voltage: U_dN=450V

Rated DC current: I_dN=4800A

The whole efficiency: η>85%

Output power: P_out>1800kW

Designed frequency: f=150~250kHz

MOSFET inverter: 135kW×16

circuit output mode: no welding transformer output, secondary resonance

2.2 Power distribution requirements

Nominal power:1800kW

Rated DC power: Pd=2160kW

Line-in power factor: COSφ0.9

Power distribution capacity: S<2400kVA

Power supply voltage: 3-phase 380V/50Hz

Line-in current: I=3920A

Line-in cable: each phase adopts six pcs of 300 copper cable, 3-phase 4-line

3. Composition of 1800kW steel tube/pipe welding machine

Equipment	Composition / Model	Quantity
1800kW solid state HF welder	Switchgear rectifying cabinet	1 set
	Inverter output cabinet	1 set
	Central operation console	1 set
	Connecting optical fiber	1 suit
	Mechanical adjustment device	1 set
	Air/water cooling system (optional )	1 set

4. Brief introduction for steel tube/pipe welding machine

4.1Switchgear rectifying cabinet

Designed with integration of switchgear cabinet and rectifying part, besides achieving switchgear cabinet functions, it also has rectifying control functions of solid state H.F. welders.

l Installed line-in switch, line-in current meter, voltage meter (can be switched) and line-in voltage indication lamp;

l Installed 3-phase full-controlled thyristor rectification bridge to realize power adjustment of the HF welder;

l Installed flat-wave reactor, flat-wave capacitor and filter to improve the flat-wave coefficient.

4.2 Inverter output cabinet

l The inverter part is consisted of MOSFET single-phase inverter bridge connected in parallel. The power of single-phase bridge is 135kW; the inverter bridge adopts the building block method to realize power superposition. Every piece of bridge plates is designed in the shape of a drawer, which is very easy to install and repair;

l The matching transformer is adopted for power combination, also it adopts the output method by of secondary resonance and non-welding transformer, tank circuit resonance capacitor (low voltage) resonates with the inductor directly, and the output pole plate offers required power transmission for pipe welding;

l Adopted sealed equipment case, installed with air conditioner.

4.3Connecting optical fiber

The switchgear rectifying cabinet and the inverter output cabinet are connected with optical fiber, so as to make sure control system can not be disturbed by HF signal, which enhances the reliability of equipment.

4.4Circulation soft water cooling system

Circulation soft water is used as cooling water with temperature and water level indicator and protection, which can perfectly accomplish the cooling work for rectifying cabinet, inverter cabinet and resonance tank circuit. air/water cooling system are optional.

4.5Central operation console

It realizes solid state H.F. welder remote operation and power regulation, installed with LCD which indicates armature voltage, field voltage indication and of DC drive and DC voltage, DC current indication of H.F. welders.

4.6Mechanical adjustment device

Applied to install inverter output cabinet and adjust inductor position.

2-D is for induction welding mode;

3-D is for contact welding mode.