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Assessment of the Corrosion Resistance and the Mechanical Properties of Laser Welded Joints Made of Steel DOCOL 1200M

Jacek Górka, Monika Kciuk, Sebastian Stano, Szymon Domżal

The article presents test results concerning the corrosion resistance of laser beam welded joints made of steel DOCOL 1200M. The thickness of the joints subjected to the tests amounted to 1.8 mm. The joints were welded in the flat position (PA), without the use of the filler metal; the linear welding energy was restricted within the range of 25 J/mm to 55 J/mm. The non-destructive tests revealed that the joints represented quality level B in accordance with the ISO 13919 standard. The results of mechanical tests demonstrated the possibility of obtaining joints, the strength of which equalled that of the base material, which is unobtainable when welding such high strength steel (1200 MPa) using arc welding. The corrosion resistance tests were performed using the gravimetric method in alkaline, inert and acidic environments (0.1 M solution of sodium hydroxide (NaOH), the 3.5% solution of sodium chloride (NaCl) and the 0.1 M solution of sulphuric acid (VI) (H₂SO₄)). The material subjected to analysis was characterised by varied corrosion resistance, resulting from the test environments. The test joints contained various forms of corrosion-triggered damage including cracks, pits, swells and material losses. The above-presented corrosion resistance tests revealed that welded joints made of steel DOCOL 1200M were characterised by the highest corrosion resistance in the alkaline solution and the lowest corrosion resistance in the acidic solution
doi: 10.17729/ebis.2022.2/1