 The research aimed to develop a technology for producing thick walled duplex steel welded joints. The material used was X2CRMON22 duplex steel in the form of a 15 mm thick plate. A hybrid laser arc welding, HLAW, method was employed to produce the root pass of the double but welded joint while the filler passes were made by submerged arc welding, SAWL. Non-destructive and destructive testing was conducted to assess the quality of the welded joint. The results showed that the joint had high strength properties, tensile strength, TS, 790 plus or minus 7 MPa, and high ductility of weld metal, 160 plus or minus 4 J, heat affected zone, 216 plus or minus 26 J, and plasticity, bending angle of 180 degrees with no macro cracks. Hardness on the cross-section of the welded joint did not exceed 280 hv10. This article was authored by Richard Krautschik, Jacek Slania, Jaegorz Galanski, and others. We are article.tv, links in the description below.