A PROCESS OF SUBMERGED ARC WELDING WITH FORWARD AND BACKWARD FEEDING OF COLD WIRE ADDITION FOR BUTT JOINT WELDING APPLICATIONS

摘要

The invention relates to a process to improve the technology in submerged arc welding wherein for feeding the wire from wire spools, only single power source with control system is required for performing the welding process. For adding two more wires as the same as that of the main wire with same or different chemistry wire, require a separate wire feeder for performing forward and backward feeding of cold wire addition technology in submerged arc welding process. It is possible to simultaneously feed multi wires with same or different chemistry in three wire feeders at same feed rate or different feed rate for different current rating. This new wire feeding with controller and special torch will enhance the production rate in double when compared to the conventional submerged arc welding process. A cold wire feeder with special is designed and interfaced with the available DC wire feeder for coupling the additional wire feeder for feeding the forward and backward feeding of cold wire in the arc cavity in submerged arc welding process. With this new wire feeder the cold wire addition can be provided in both direction of welding. This results in additional weld deposit with same heat in-put energy available in the arc zone. Additional power source is not required for this new design of wire feeder and special torch. This new wire feeder and special torch is interfaced with the existing convention SAW machine for drum test plate welding. The test results of radiographic test, Ultrasonic test are found satisfactory as per IBR and ASME Sec IX.