The first and only training institution in the Philippines offers American Petroleum Institute code standard API 1104 widely known in the oil and gas industry cross country Pipeline system, Vertical down welding with cellulosic electrodes is normally done with high currents and high travel speeds. Cellulosic electrodes have a thin coating containing a large amount of organic cellulose. When the electrode is burned, the coating forms a protective gas coating for the molten metal. Because of the organic material and the moisture content of these electrodes, they have a very strong arc force but at the same time the weld metal freezes very quickly. This method of welding is fast and economical, consequently most cross country pipelines are welded with the progression vertically downward. Impact toughness properties, which are very good may be met with modern cellulosic electrodes.




                 



 

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