1. 1) R. G. Baker: Metal Construction and Brit. Welding J., E.M.O., Feb. (1970), 65.
2. 2) Discussion Session III, Proc. Conf. on Weldable Al-Zn-Mg Alloy, 23-25 Sept. 1969, The Weld. Inst., Cambridge, (1970), p. 126.
3. 3) D. M. Robking, N. M. Vorapai and R. S. Karamyan: Automatic Welding, 21, Aug., (1976), 6.
4. 4) I. B. Robinson and F. R. Baysinger: Weld. J. Research. Suppl., 45 (1966), 433S.
5. 5) W. Gruh and H. Cordier: Z. Metallk., 55 (1964), 577.