Evaluation of the effect of welding technology on the operational characteristics of joints

Abstract

The purpose of the study presented in the article is a comparative analysis of operational characteristics, namely strength and tightness, of welded samples of corrosion-resistant steel on the example of 10Cr17Ni13Mo2Ti steel. These samples were obtained by different technologies: the more environmentally friendly technology of rotary friction welding without heat treatment and the currently used technology of arc welding and post-weld heat treatment. Special tooling was developed for the tightness tests and the tests were carried out on a hydraulic test bench. For the strength tests, the tooling was also developed and the tests were performed on a tensile testing machine. Tightness testing of the samples showed that both types of samples could withstand a test pressure of 12 MPa, including 0 to 2 mm tube wall thinning (0 to 80% of the original thickness), and 35 MPa, including 0 to 1 mm tube wall thinning (0 to 40% of the original thickness). The strength tests showed that the samples obtained by friction welding, under the conditions of tests on pulling the tube from the equivalent sleeve, withstand the maximum load to failure, exceeding by 14.9% the corresponding index of the samples obtained by arc welding.