The downhill welding of fillet welds by the MAG process is regarded as an insecure method by many in the welding industry, and is, therefore, rarely used. Some German shipyards, however, have successfully developed and applied downhill welding procedures for thin-walled applications using OK Tubrod 14.12 metal-cored wire. Welding defects in the root of the weld, associated with downhill MAG welding, have made shipbuilders reluctant to apply this method, in spite of the productivity benefits offered by the process. Typical root defects are: Lack of penetration. The occurrence of slag or slag particles in the back of the root when using flux-cored wires. Lack of fusion when using solid wire.
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