LOW HYDROGEN TYPE WELDING ROD FOR SITE WELDING OF STEEL PIPES

摘要

PURPOSE:To obtain a welding rod of easy welding work by covering a steel core with coating material contg. a specific amt. of carbonate of metals consisting essentially of Mg, and =1 kind of CaF2, MgF2, NaF, AlF3, cryolite and consisting of the balance a slag forming agent, and a desoxidizing agent. CONSTITUTION:The coating material is formulated to consist essentially of Mg, to contain 30-70wt% carbonate of =1 kind of Ca, Ba, Li, Na, K, Mn and = 25wt%=1 kind of CaF2, MgF2, NaF, AlF3, cryolite and to consist of the balance a slag forming agent and a desoxidizing agent normally used for low hydrogen type covering. The amt. of the carbonate of =1 kind of Ca, Ba, Li, Na, K, Mn is kept at =20wt% the weight of the entire composition. Such coating material is used in such a way that the weight ratio to a steel core is 0.2-0.6, and the steel core wire is coated with said material.