SAW welding Machine

Submerged Arc Welding (SAW) is a joining process that involves the formation of an electric arc between a continuously fed electrode and the workpiece to be welded. A blanket of powdered flux surrounds and covers the arc and, when molten, provides electrical conduction between the metal to be joined and the electrode. It also generates a protective gas shield and a slag, all of which protects the weld zone.

We need a power source for this submerged arc welding at a 100% duty cycle. The SAW welding process is continuous and the length of one weld may go up to 10 minutes. General power sources with a 60% duty cycle may get derated according to the duty cycle curve of 100%. The voltage sensing wire feeder must be used when a constant current of ac/dc applies. The fixed speed wire feeder uses a constant voltage while the CV system drives with direct current.

Both the process DC generator and AC transformer may be used but rectifier machines are more popular. The submerged arc welding machine available in the range from 300 amperes to 1500 amperes.

The direct current equipment suits semi-automatic applications while alternating current power source fit for the automation only. The extra power can be achieved by joining both in parallel. With AC type equipment, the use of multiple electrodes is possible in specialized types of applications.