Submerged Arc Welding

Submerged arc welding is continuous, consumable bare wire electrode and arc shield is provided by a cover of granular flux. Electrode wire is fed automatically from coil into the arc. Flux introduced into the joint slightly ahead of weld arc by gravity from hopper. Deoxidizers and alloying elements are the other ingredients. The blanket of granular ﬂux submerged in operation of welding prevents sparks, spatter and radiation. Slag and unused ﬂux granules on the top of provided good protection from the atmosphere and good thermal insulation for weld area. Slow cooling and high quality weld joint, noted for toughness and ductility. Unused remaining ﬂux after welding can be recovered and re used. Solid slag covering the weld must be chipped away by manually.

Advantages of Submerged Arc Welding:

● Very high quality welds are produced.

● Is a very fast method.

● Deep penetration can be obtained.

● Shield accessory for the eyes is not needed.

● Long joints can be easily welded.

Disadvantages of Submerged Arc Welding:

● Is not suitable for welding works which is inclined and vertical.

● The welding zone is not seen. So it is difficult to guide the electrode movement.

Applications of Submerged Arc Welding:

● Submerged arc welding is widely used in steel fabrication for structural shapes. [ex. welded I- beams].

● Longitudinal and circumferential seam for large diameter. [pipes, tanks, pressure vessels]

● Steel plates of 25mm and above thickness and heavier plates are continuously welded by this process.

END

Submerged Arc Welding