Evaluating the Influence of Friction Welding Pressures on Corrosion Rate of Stainless-Steel Pipes.

Rotary friction welding is a solid-state welding process that involves the joining of two materials through friction heat generated by the rotational motion of one component against the other. The friction and forging pressures applied during the process can affect various properties of the welded joint, including the corrosion resistance of stainless steel. 18-8 austenitic stainless steel similar pipes were having been welded frictionally by four various friction-forging pressures at the same time of 10 seconds and a rotational speed of 1120 revolutions per minute. After that, the soundness and the corrosion behavior of the welded samples had been examined by visual inspection and potentiodynamic measurements after immersion in 3.5 wt. percentage NaCl as an artificial electrolyte simulates the seawater. The results showed that the higher friction-forging pressures imply better joint quality and more uniformity formed flash. The corrosion potential of the S1 sample with (3-3) friction- forging pressures is (-0.635 v) which means it has less corrosion resistance in comparison with S4 sample (-0.417 v) with (12-12) friction- forging pressures. As a conclusion to the paper, the corrosion rate of frictionally welded austenitic stainless steel similar pipes specimen's decreases with increasing friction-forging pressures due to the plastic deformation and the heat generated that contribute of refining the grains size and stronger bonds. [ABSTRACT FROM AUTHOR]