supply of supply, installation & commissioning of w.m as per spec enclosedsupply, installation & commissioning of w.m as per spec enclosed,supply, installation & commissioning of welding machine, required 04 nos. for freight exami nation yard, nbq, as per specification enclosed. , input supply: 03 phase, 415 v ? 10%, ac, 50 hz, rated in put kva:50 kva or higher, welding current range: 80 to 750 amps., open circuit voltage: 80 to 90 volts d c.permitted load at 100 % duty cycle: ≥ 465 amps./28.5 volts., permitted load at 100 % duty cycle:≥ 600 amps./ 44 volts., permitted load at 100 % duty cycle:≥ 750 amps./ 44 volts. welding current range-80a/23 v-750a/44v.2. open circuit voltage- 87v.3. main supply 3.0 ph, 50/60hz-415v. 4. permitted load at maxim um--750v-44v.5. dimension (w x l x h) in mm- 780 x 950 x 870.6. make- esab, model- lhj 425/750 , desig n features: the machine must be a diode rectifier type having 02 nos. diode bank (400 a rating) & the tran sformer having separate primary & secondary windings, moving core, type of cooling: forced air cooled by provision of fan (fan swipe not less than 380 mm). cooling fan make either crompton or usha or stark mot ors or ebmpast or havels or orient or alfa. fan speed: 1440 rpm or more to ensure effective cooling, volt & ampere meter: provision of digital display meter ? this will show welding current and voltage as well as ke eps the voltage and current values after welding is finished, protection/safety: thermal protection circuit n eeds to be installed inside the machine to protect the machine (one power contractor & auxiliary /control tr ansformer must be provided to activate the protection circuit & main transformer), main contractor make & rating: make-abb or siemens or l&t or schneider or danfoss or bch and rating minimum 75 amps., class of insulation: h- class or higher 1800 c., portability: mounted on trolley fitted with solid rubber wheels wit h bearings (minimum 04 wheels with front swiveling pull handle f