PSI - Issue 30

Pavel Zhilin et al. / Procedia Structural Integrity 30 (2020) 209–215

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Pavel Zhilin et al. / StructuralIntegrity Procedia 00 (2020) 000–000

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b)

Fig. 11. The process of the chemical composition control (a) and iron content (b) in various deposited layers obtained using the ERNiCrMo-3 hot-wire on the AISI 8630 steel.

The prototype of inverter power source for AWF heating has been manufactured in collaboration with the “Technotron” welding equipment factory (Cheboksary, Russia). Also, industrial tests of welded structures have been carried out in relation to the procedures used by “Gazprom” PJSC. The effect of AWF heating on residual stresses has been investigated using two plates from the 0.8%C-15%Cr 5%Ni-2%Cu-1%Ti-0.7%Si heat resistant steel with a size of 200×50 mm and different thicknesses (1.2, 1.5, and 3.5 mm). The plates have been butt-welded without gap by three methods (manual, automatic conventional and hot-wire GTAW) using the facility presented in Fig. 7. The linear dimensions of the plates have been measured before and after welding at four points. Also, angular deformations have been assessed. Transverse shrinkage of the welded joints has been the smallest after the automatic hot-wire GTAW process for all thicknesses studied (Fig. 8). The achieved results are of interest to enterprises in the aircraft industry. The optimal AFW heating modes have been calculated for an automatic hot wire GTAW procedure to manufacture structures from the 0.2%C-0.3%Mn-0.5%Cu-0.5%Ni low alloy and 0.8%C-18%Cr-10%Ni stainless steels used in powder metallurgy in order to reduce the number of discontinuities due to the high hydrogen content in the welds such as presented by Arzamasov et al (2002). Another solved problem is the reduction of iron in the third deposited layer on equipment parts for subsea hydrocarbon production (Fig. 9–11). These achievements can also be applied to improve technologies used by “Gazprom” PJSC. 3. Conclusions Based on the obtained results, the following conclusions were drawn: 1. The calculations of heat input for submerged arc cladding using cold and hot AFW have been done. 2. The optimal modes of heating AFW have been assessed. 3. The effect of various amounts of filler wires on the profiles of the welds and deposited beads has been investigated. 4. The theoretical and practical significance of the performed studies lies in the fact that their main results can be applied in the practical implementation of the methodology for calculating AFW heating modes to develop and produce new types of welding and cladding equipment using an arc, plasma, laser and electron beams a heat source.