GYS Gyspot Evolution PTI-s7 is an inverter spot welder for car body sheet, boron steels, UHSS and martensitic steels among them. The C type gun gives a current of 14 500 A at a clamping force of 550 daN, and the transformer sits in the body of the gun. The supply is 3 x 400 V, and liquid cooling serves the arms and the transformer.
What this machine is for
The spot welder answers the materials that today's car bodies are built from: Boron, UHSS and martensitic steels. A welding current of 14 500 A goes straight to the point of contact, without losses on long current cables, because the transformer is built into the gun. A short current loop gives a fast rise of the pulse, and that is the condition for correct welding of boron steels without excessive grain growth in the heat affected zone.
The machine goes to body and paint shops which repair car bodies to the procedures of vehicle makers. It welds packets of galvanised sheet, goes through layers of structural adhesive and records every spot, so it suits accident repairs settled with an insurer. The inverter architecture with the transformer in the gun lowers the power draw from the mains, thanks to which the unit works on a 32 A fuse with a D characteristic.
The pneumatic clamping force of 550 daN at a pressure of 7 bar is what spreads the force on the electrode caps. Together with the current and the pulse time these are the three quantities that decide the nugget of the spot, which is why the machine measures them and compares them with the programmed technological window after every spot.
Features and equipment
- PTI technology with the transformer in a C type gun: a shortened current loop limits the losses from inductive reactance, which in cable spot welders reach as much as 40% of the output energy.
- Welding current 14 500 A and an inverter frequency of 2000 Hz: a short, steep pulse builds the nugget of the spot also in boron steels.
- Pneumatic clamping force 550 daN at a pressure of 7 bar: the clamping force is steered from the panel and matched to the packet of sheets.
- AUTO mode: the system recognises the type of steel, the thickness of the packet, the anti corrosion coatings and the layers of adhesive, and then picks the clamping force and the current profile itself.
- Welding through structural adhesive: a separate phase that breaks through the insulating layer comes before the main current pulse.
- Liquid cooling with a 30 litre tank: the circuit cools the arms, the electrode caps and the transformer itself, so the working temperature of the secondary circuit is steady, and per the maker the life of the caps rises by over 50%.
- Thermal protection: on a failure of the cooling the unit switches itself off.
- Recording of spots and reports on an SD card: the system saves the current, the clamping force, the pulse time and the departures from the norm, and to the report you add the VIN number and the name of the operator.
- A message on the correctness of the spot: on a process error the panel gives the cause, so you make the correction at once.
- Exchangeable arms on quick couplings: the maker gives reaches up to 600 mm and a change in under 2 minutes.
Technical data
| Brand | GYS |
|---|---|
| Type | inverter spot welder with a C type gun |
| Welding current (I RMS) | 14 500 A |
| Clamping force of the gun at 7 bar | 550 daN |
| Supply voltage | 3 x 400 V, 50 to 60 Hz |
| Mains fuse | 32 A, D characteristic |
| Inverter frequency | 2000 Hz |
| Cooling system capacity | 30 l |
| Length of the gun cable | 4 m |
| Weight of the gun with the cable | 10 kg |
| Reach of the arms | up to 600 mm |
| Cooling | liquid |
| Data recording | internal memory and an SD card |
What to watch out for
The supply is 3 x 400 V at 50 to 60 Hz and the fuse 32 A with a D characteristic, so the socket in the workshop has to be prepared for a pulsed start. The pneumatic installation has to give 7 bar, because the clamping force of 550 daN and the repeatability of the spot depend on the pressure. The coolant tank holds 30 litres: you check the level, the flow and the cleanliness of the fluid before the shift, and after a longer stop you watch the state of the pump. The gun with the cable weighs 10 kg and the cable is 4 m, so when working over a large part it is worth hanging the gun on a balancer.
Before you buy settle with us the set of arms, because reaches up to 600 mm are matched to given car bodies, and the electrode caps are a wear part. Check as well whether you need an SD card to archive the reports, and what state the hoses and the quick couplings in the cooling circuit are in.
How we sell used machines
This unit was checked in our service workshop in Krotoszyn with measurements to PN-EN 60974-4 and a load test. The price includes the first year of the basic service package: an inspection with cleaning of the machine and a validation measurement. Further years can be added. We ship across the European Union, collection in person by appointment.