Valk Welding: Welding machines

MIG / MAG - Pulse welding machines

General
The inverter-controlled Panasonic 350 GE-2 pulse welding power source and matching wire feeding unit are the ‘state-of-the-art’ in the field of welding techniques; for robotised welding of aluminium, steel and RVS.

The welding machine is completely digitally integrated in the robot control, offering enormous advantages regarding ease of programming and simple optimisation of welding parameters.

The Panasonic 350 GE-2 is specifically designed for high quality welding, for which maximum monitoring of the melting bath and heat input is required. This is obtained by constantly monitoring the wire speed. With the digital coupling with wire feed motor, there is constant feed-back on the actual wire speed. Variations between the demanded wire speed (based on the welding parameters) and the actual wire speed are permanently adjusted.

The above mentioned monitoring with feed-back results in a very constant weld.

The most important advantages are:
- Very stable arc, resulting in splash-poor to splash-free welding.
- Rapid welding stops (3x faster compared with traditional wire feed systems), resulting in both an optimal and constant form of the wire end after each welding.
- The controlled stop also means a more stable and faster welding start (20% faster compared with traditional systems).
- The digital monitoring of the pulse form results in the ideal situation for pulse welding (of aluminium): 1 melted drop per pulse. (See figure below).
 

Technical characteristics
- 100% completely digital monitoring of all welding parameters.
- Digital interface with Panasonic welding robots.
- Calibrated output of the welding parameters. (250 Ampere = 250 Ampere!)
- Very fast and reliable ‘liquid’ welding start.
- High welding speed possible.
- The 32 bit RISC CPU monitoring unit guarantees the very stable welding arc, resulting in minimal splashing during welding.
- Variation in arc length is being corrected immediately.
- Fine Tip Treatment: sharp burning-off at end of weld; for increased reliability at the welding start.
- Parameter monitoring system for: welding current, welding voltage, wire speed enz.
System configuration
Complete coupling with the Panasonic welding robot provided, resulting in a simple connection using only one communication cable between robot controller and welding machine.
 
Technical specifications
- Input voltage 400 V AC ±10% (rated: 400 V AC), Three phase
- Frequency 50 Hz
- Rated input capacity 20 KVA (18 kW)
- Output volt-amperage CV (constant-voltage characteristic)
- Maximum no-load voltage 74VDC
- Output current range 30-350ADC
- Output voltage range 12-31.5VDC
- Rated duty cycle 60%
- Power control method IGBT inverter control
- Computer interface RS-232c, RS-422
- Memory 32-inch reproducible storages
- Robot interface Serial communication interface to Panasonic G2-series robot controllers
- Applicable welding method CO2, MIG, MAG, pulsed MIG, pulsed MAG welding
- Waveform control method Digital control: -7 (small) to +7 (large)  (Standard: 0)
- Sequence Main welding, main welding-crater, initial main welding crater*, Arc spot (*:”Repeat”function is available
- Applicable shielding gas CO2 (100% CO2)
MAG (80% Argon and 20% CO2)
MIG (Argon with 2% oxygen) or (100% argon)
- Applicable wire diameter 0.8, 0.9, 1.0 and 1.2 mm
- Applicable wire material Mild steel, mild steel_FCW (flux cored wire), stainless steel, stainless steel _ FCW, aluminium (hard/mild)
- Wire inching Inching (feed forward), retract (feed backward)
- Gas check time 1 second – 1 minute/continuous (increment of 1 s)
- Pre-flow time 0.02 – 5.00 s continuous adjustment (increment of 0.02s)
- After-flow time 0.10 – 5.00 s continuous adjustment (increment of 0.02s)
- Arc spot time 0.3 – 10.00 s continuous adjustment (increment of 0.10s)
- Input power terminal Terminal board (for three phase, fixed with M5 bolts)
- Output terminal Coupling device
- Dimensions (W x D x H) 380 mm x 510 mm x 570 mm
- Weight 66 kg

N.B. the mentioned welding duty of 60% is determined according to the American standard. The European equivalent is 70% welding duty.