THYRISTOR CONTROLLED WELDING MACHINES

Detailed Product Description
Thyristorised closed loop feed-back current control to maintain stable welding current. Provides spatterless Radiographic quality welding. Unique filter design to ensure low ripple level and outout current variation within International Welding Standards. Efficient and compact power source design with enhanced power factor. Consumes less KVA Electronically controlled tripping circuitry to ensure safety tripping against short circuiting of output terminals beyond 30 seconds, over heating of Heat Sinks, transformer coils and failure of cooling media. Positive Arc starting facility to help easy arc starting and prevention of electrode freezing apart from deep penetration welding. Sturdy Remote Current Control Pendant with Hot Start facilty which provides additional current for a short period to remelt the craters from the previous electrode avoiding slag inclusion, available at the finger tips of the operator. Most ideal static current- voltage characteristics to suit varied welding applications. Automatic Arc Force Control System for adjustment of short circuit current and arc characteristics. PULSE TIG WELDING: UPSLOPE, DOWNSLOPE, PULSING BACKGROUND CURRENT, PEAK CURRENT CONTROL etc. provided for reducing heat input for welding thin sheets. TECHNICAL SPECIFICATIONS FOR THYRISTORISED WELDING RECTIFIERS MODELS TD 400 TD 500 TD 600 TD 800 TD 1200 Supply voltage 3PH, 415 VOLTS +/- 15%, 50HZ Insulation Class H/F H/F H/F H/F H/F Max. Primary Current 37A 47A 57A 83A 125A Open circuit voltage ------------------------------------- 75-85 V ------------------------------------------- Current at 60% duty cycle 400A 500A 600A 800A 1200A Welding cable section (Cu) 50 SQ.MM 70 SQ.MM 95 SQ. MM 125 SQ.MM 190 SQ.MM Current Setting range 10-400 10-500 10-600 20-800 50-1200 Dimensions (LxWxH mm) 830x570x920 910x570x1000 910x570x1000 1000x800x900 1000x800x900 Weight 175 Kg. 200 Kg. 300 Kg. 450 Kg. 550 Kg.