Mechanical Guru's

ARC WELDING POWER SOURCES THE MAIN REQUIREMENT OF A POWER SOURCE IS TO DELIVER CONTROLLABLE CURRENT AT A VOLTAGE ACCORDING TO THE DEMANDS OF THE WELDING PROCESS BEING USED. EACH WELDING PROCESS HAS DISTINCT DIFFERENCES FROM ONE ANOTHER, BOTH IN THE FORM OF PROCESS CONTROLS REQUIRED TO ACCOMPLISH A GIVEN OPERATING CONDITION AND THE CONSEQUENT DEMANDS ON THE POWER SOURCE. THEREFORE, ARC WELDING POWER SOURCES ARE PLAYING VERY IMPORTANT ROLE IN WELDING. THE CONVENTIONAL WELDING POWER SOURCES ARE:  POWER SOURCE SUPPLY POWER SOURCE SUPPLY (I) WELDING TRANSFORMER AC (II) WELDING RECTIFIER DC (III) WELDING GENERATORS AC OR DC (DEPENDING ON GENERATOR) WELDING TRANSFORMERS, RECTIFIERS AND DC GENERATORS ARE BEING USED IN SHOP WHILE ENGINE COUPLED AC GENERATORS AS WELL AS SOMETIMES DC GENERATORS ARE USED AT SITE WHERE LINE SUPPLY IS NOT AVA

WELDING INTRODUCTION: WELDING WHICH IS THE PROCESS OF JOINING TWO METALLIC COMPONENTS FOR THE DESIRED PURPOSE, CAN BE DEFINED AS THE PROCESS OF JOINING TWO SIMILAR OR DISSIMILAR METALLIC COMPONENTS WITH THE APPLICATION OF HEAT, WITH OR WITHOUT THE APPLICATION OF PRESSURE AND WITH OR WITHOUT THE USE OF FILLER METAL. HEAT MAY BE OBTAINED BY CHEMICAL REACTION, ELECTRIC ARC, ELECTRICAL RESISTANCE, FRICTIONAL HEAT, SOUND AND LIGHT ENERGY. IF NO FILTER METAL IS USED DURING WELDING THEN IT IS TERMED AS ‘AUTOGENOUS WELDING PROCESS'. DURING ‘BRONZE AGE' PARTS WERE JOINED BY FORGE WELDING TO PRODUCE TOOLS, WEAPONS AND ORNAMENTS ETC, HOWEVER, PRESENT DAY WELDING PROCESSES HAVE BEEN DEVELOPED WITHIN A PERIOD OF ABOUT A CENTURY.  FIRST APPLICATION OF WELDING WITH CARBON ELECTRODE WAS DEVELOPED IN 1885 WHILE METAL ARC WELDING WITH BARE ELECTRODE WAS PATENTED IN 1890. HOWEVER, THESE DEVELOPMENTS WERE MORE OF EXPERIMENTAL VALUE AND APPLICAB