Welding materials

We would like to know the price and other details inlcluding the setting range , etc of the following materials .
The required quantity of the materials is mentioned below -
1. Welding rectifier single phase ozen (model dc 160) setting range 30-160 amp
2. welding rectifier single phase ozen (model dc 200) setting range 32-190 amp
3. welding rectifier three phase ozen (model dc 250) setting range 30-160 amp
4. Welding rectifier single phase ozen (model edc 160) seting range 30-400 amp