Moisture problem during Electrode Storage
Welding is an important tool for efficient maintenance of plants and quality fabrication in industry. The welding electrode or rod consists of a metal wire with a baked chemical/mineral coating. The coating of the electrode holds the key to quality welding. Welding defects caused due to poor quality and weak welding are a nuisance because
Factors effecting the quality of weld
These are some key elements responsible for the quality of the weld. However dampness(moisture / humidity) during storage and handling of electrodes is by far the most critical
Common moisture problems during Welding Electrode Storage
Moisture wrecks havoc on the weld. The welding rod consists of a metal core surrounded by a coating of flux. The flux coating controls and improves the welding process. The coating of the electrode is made of blends of cellulose, iron powder or low hydrogen and blended with sodium, Titania, potassium and iron oxide. This makes the welding electrode highly hygroscopic and hence the necessity of proper storage to prevent deterioration of the coating. Damp electrodes result in a fiery arc, excess splatter of the weld metal, weld metal at wrong place, weld cracking; making even the most skilful welder helpless.
Common welding defects and problems
Hydrogen embrittlement: Hydrogen embrittlement is the introduction of hydrogen in metals during forming and finishing operations. While welding, moisture located at the surface of steel or from filler metal or gas used in welding, dissolves into O2 and H2. While most of the hydrogen from the bead escapes, hydrogen remains soluble in the region adjacent to the weld. With pressure building underbead cracking or hydrogen embrittlement follows.
In welding of steel, we can minimize underbead cracking by: preheating surface of steels, using low hydrogen electrodes, and allow for a low cooling rate for weld bead to give a chance for hydrogen to escape.
Bry-Air increased shelf life of welding electrodes at L&T
L&T are leaders in the engineering, technology, construction and manufacturing. Its core businesses are in engineering and construction projects, heavy engineering, power, electrical and electronics, machinery and industrial products, railways, etc.
As construction leaders with many awards to its credit, experts at L&T were concerned about the damaging effects of humidity during electrode storage. Presence of moisture is best avoided in storage rooms it reduces shelf life of welding electrodes and causes welding defects(outlined earlier). A weld holds the burden of heavy infrastructures and machinery, bridges, flyovers, tall and exquisite buildings, etc. A simple crack in the joint often has far reaching and sometimes even fatal consequences. For superior finish as well as strength and stability, proper storage of electrodes is fundamental. For providing moisture control solutions L&T relied on Bry-Air, a leader in providing dehumidification solutions for over 40 years, world wide. After thorough consideration, Bry-Airgineers arrived at the conclusion that the most ideal and economical RH for storage of electrodes was 40 ± 5% RH. Bry-Air Compact Desiccant Dehumidifiers were pressed to service. With this welding quality has improved and electrodes also last longer.
Bry-Air Dehumidifiers: ensures longer shelf life of electrodes and eliminates welding defects
Other key areas where a dehumidification is must