All cellulose-based welder down Welding Wire of the main requirements are:
(1) has a steep drop external characteristics;
(2) The thrust of current work outside the trailer when its value should be large enough;
(3) an appropriate increase in drag outside the static characteristic curve inflection point, in order to achieve a small droplet.

At present, the number of regional long-distance pipeline network construction and some areas of water, automatic, semi-automatic welding electrode material and equipment due to environmental constraints, not easily accessible areas of the long-distance pipeline construction project and more use of this technology, such as Zhenhai Refining & Chemical - Hangzhou Cambridge pipeline project.

All cellulose-based downward welding process parameters in Table 1. The process is the key to backing weld forming side welding when required; Yang welding position to prevent the droplets appear on the back of the gravity sag and adhesion of hot metal rod. Next to the welding of both early-type cellulose.

Keywords: mig welding wires