Sub Arc Welding - SAW

Submerged arc welding is a method in which the heat required to fuse the metal is generated by an arc formed by an electric current passing between the electrode and the workpiece.  There is no visible arc and no sparks, spatter or fume. The electrode may be a solid or cored wire or a strip. SAW is normally a mechanised process.

The submerged arc welding flux feeds through the hopper tube and continuously distributes itself over the seam a short distance ahead of the welding zone.  The wire feed mechanism begins to feed the welding into the joint at a controlled rate.  An electric arc is established as the current flows between the electrode and the work. The carriage is started(manually or automatically) to travel along the seam.

Current: the total welding current can range between 100 and 3600 amps. Wires in one molten pool: from 1 to 6.  Voltage: 20-50 volts.  Speed: 30-350 cm/min. Deposition rate: 2-100 kg/hr.
AW can be employed in five ways Single Wire • Single wire welding is the most widely used SAW method. • DC power source is used. • The solid or cored wires of diameter 2.0-4.0 mm are used. •A small diameter produces a higher deposition at the same rate..

Watch This Video To Know More About Sub Arc Welding