Effect of Oxidation, Sandblasting and Pickling on Weldability.

摘要

Studies of the weldability problem of austenitic steels have led to new methods for improving weldability. Majetic and Yeo have patented a method on which the weldable surface is oxidized by annealing, or on it is spread a thin layer of certain oxides. The welding speed increases up to 350% due to the oxide layer. The weldability problems also disappear when a method invented by Moisio and Leinonen is used. In this case, small amounts of oxygen, carbon dioxide, or steam are added into the customary TIG shielding gases. A third way to improve the weldability is to sandblast the surface to be welded. If the weldability of steel is poor, it is often advisable to use the methods mentioned. The purpose of this study is to clarify the effects of oxidation, sandblasting, and pickling on penetration. The matter is particularly studied by welding tests performed under laboratory conditions. 13 refs., 5 figs., 2 tabs.