Due to an error in the transliteration of the authors' names during translation of the Russian language version of this article, which was originally published in Svarochnoe Proizvodstvo 2011:64(4);15–20, the author P.A. Gavrish was erroneously given as P.A. Gavrin. The correct list of authors is as follows:
V.V. Chigarev, P.A. Gavrish and E.P. Gribkov