A general review is given, with a schematic representation of the corrosion process indicating corrosion-promoting and corrosion- inhibiting factors. .... The hardening of Cr-V steel wire on ... Welding tests with He and A showed that arc lengths of 0 03a 0-04 in. with d.c. and 0-02 a 0-1 in. with a.c. were suitable, and Wanbsp;...