In this column, we will share with you regularly our experience in major application areas where usage of dehumidification is both extensive and essential.

Remove Moisture, Prevent Welding Electrodes Damage !

Welding is an important tool for efficient maintenance of plants and quality fabrication in industry

In applications varying from simple fabrications of plain carbon steel to demanding joints in high strength materials welding process is widely used. The welding electrode in this process serves both as the arc carrier and the filter metal. It consists of an alloyed or unalloyed core-wire and a flux coating. Electrodes are available in various diameters and lengths, depending on the position, material thickness and requirements of the welded joint.

There are five main groupings of electrodes :
Rutile (Titanium dioxide)
Basic (Calcium carbonate and fluoride)
Cellulostic (Cellulose)
Iron powder
Surfacing and non-ferrous alloy types

Care and storage of electrodes

Generally, it is assumed by the welding engineers that quality of the welding depends on the skill of the welder or the quality of the welding consumable, i.e.

the electrode. More often than not another factor, moisture, plays and important role in the “poor” quality of welding. The quality of welded joint and ease of welding depends entirely on the condition of electrodes. If the mineral coating is damaged, poor arc stability and inadequate shielding will result.
As most electrodes are mineral coated, they are highly hygroscopic in nature. If not properly stored, most of the coating materials can absorb moisture. This could result in deterioration of coating and subsequent hydrogen pick-up in the weld bead.



Any one or more of the following problems may indicate deterioration of the electrode coating due to moisture :

  • Increased Arc Voltage (arc instability)
  • Excessive Spatter
  • Porosity in weld deposit (poor bead profile)
  • Underbead cracking/heat affected zone cracking (which is not directly visible but which may result in premature breaking of the joint)
  • Poor slag removal/release
  • Undercutting and general rough welds.

The Solution

These hazards can be eliminated by ensuring that humidity is properly controlled at the time of
Manufacture
Storage prior to packaging
Packaging Bulk user storage

Relative Humidity should be maintained at 40+5% at ambient temperature to retain the quality of the mineral coating of welding electrode by installing a Desiccant Dehumidifier.
Bry-Air Dehumidifiers are effectively maintaining the exact condition needed for welding electrode storage for
Phillips L&T Limited
Alsthom Power Boiler Ltd.
Cochin Shipyard Limited
General Electrodes & Equipment Co.
Gujarat Machinery Mfr. Pvt. Ltd.
Integral Coach Factory
Indian Oxygen Jaisub & Co.

the electrode. More often than not another factor, moisture, plays and important role in the “poor” quality of welding. The quality of welded joint and ease of welding depends entirely on the condition of electrodes. If the mineral coating is damaged, poor arc stability and inadequate shielding will result.
As most electrodes are mineral coated, they are highly hygroscopic in nature. If not properly stored, most of the coating materials can absorb moisture. This could result in deterioration of coating and subsequent hydrogen pick-up in the weld bead.

BHEL ESSAB Advani Orlicon Maharashtra Weldair and many more.

The Bry-Air Dehumidifiers remove moisture from the air through a process of continuous physical adsorption. Bry-Air has a large range of standard and engineered Dehumidifiers, which can maintain RH at the desired level thereby ensuring longer shelf life of electrodes.