Abstract
Apart from the well-tried cellulosic electrodes, in the range from E6010-E9010, there are also low hydrogen grades of weld consumables, which are used in vertical downhill position - commonly called as BVD (Basic Vertical Down) electrodes. In addition, the seamless flux cored wires, are gaining prominence in the welding industry as a better solution compared to the conventional cellulosic electrodes.
The development of BVD electrodes started because of the desire to use high-strength TM pipe steels with relatively high toughness (e.g. X80). Cellulosic electrodes could not meet the requirements for cold crack resistance and high toughness properties of the weld metal. To a high degree, economical efficiency is determined by the achievable deposition rate and the possible welding speeds. In comparison to basic vertical-up electrodes, significant time advantage of 40-50% can be achieved with the use of BVD electrodes for the fill and cap layers.
Seamless Flux Cored wires for pipeline applications follow a different manufacturing approach compared to the conventional folded techniques and are much reliable with consistent performance in terms of weldability and quality. The seamless FCAW wires, offers a unique and trustworthy solution in terms of arc stability and low defect rates. These wires are also suitable to be used under sour service applications having been tested for Hydrogen Induced Cracking (HIC) and Sulfide Stress Cracking applications.
