from the conferences organized by TANGER Ltd. provisional website
Using pulsed current at manual metal arc welding represents a new research idea perspective and provocative for major manufacturers of welding equipment. The concept is based on the ability to control the volume of welding pool at low frequencies of the pulses, below 5 Hz.Experimental research underlines the beneficial influence of pulsed current welding on weld geometry for butt joints. Also the technological particularities of the process are highlighted and the use of two welding techniques depending on the frequency of pulses in terms of how the welding of the root layer is done compared with standard welding:at low frequencies below 2 Hz welding is performed intermittently, electrode oscillation frequency has the frequency of the pulses, during the pulse time the welding arc is of the flanks on the joint, and during the basic time of the pulsed the welding arc moving from one flank on the joint to other; This technique ensures safe melting of the flanks on one side, and on the other side avoid penetration root layer;at frequencies above 2 Hz welding root is done without oscillation electrode, with support the electrode on the flanks of the joint, root is safe and uniform without excessive penetration; but it requires the right choice of the opening joint.The results confirm that manual metal arc welding with pulsed current is feasible and technological beneficial effects can be obtained. It requires the expansion and diversification of research for a more complete assessment.Keywords: pulsed TIG welding, pulsed MMA welding, operating mod, butt weld, pulsed equipment STEL
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