Corrosion rate assessment between x111-t5-k4 and e71t-1ch8/t/9m-d flux cored wire

Abstract

After a propeller shaft was damaged from chloride in sea water, it has been fixed by MAG welding process with flux cored wire. Its service life after welded depends on the corrosion resistance of the weld metal. This research aimed to compare the corrosion resistance of two different weld metals between X111-T5-K4 and E71T-1CH8/T/9M-D flux core wire. The test specimens were prepared according to the ASTM G1-103 standard and tested by salt spray test, conforming to the ASTM B 117 standard. The result of the test showed that the corrosion rate of the weld metal using X111-T5-K4 flux cored wire is lower than the weld metal of E71T-1CH8/T/9M-D flux cored wire, which was 0.21 and 0.32 mm2/hr., respectively. The mass loss at 24 hours of E71T-1CH8/T/9M-D, X111-T5-K4 flux core wire were 0.32 and 0.48 grams, respectively. Therefore, enhancing the service life of propeller shaft from chloride corrosion should use X111-T5-K4 flux core as weld metal