Abstract
An evaluation of weldability has been made on new materials used for welded cans.
And the relation between the electric contact resistance(Rc) and, the surface characteristics of these materials has been studied.
Furthermore the possibility of welding of tin free steel by improving the surface characteristics and the welding method has been also discussed.
The results obtained were summarized as follows :
(1) A lightly tin coated steel with the nickel preplated layer, when the nodular metallic tin layer was formed, had a low Rc and a good weldability.
(2) A tin free steel, when the granular metallic chromium layer was deposited, showed the lower Rcand the better weldability than the tin free steel which has flat metallic chromium layer.
(3) The improved welding method, which applies pre-pressing on the blank edge before seam welding or uses tin coated copper wire for intermediate electrodes, also showed lower Rc and raised weldability.
