P. A. Gavrish
American Journal of Materials Engineering and Technology. 2013, 1(3), 46-48DOI:
Abstract: Stability of process of welding of copper with copper and copper with steel is provided with a special thermal cycle which includes preliminary heating before welding. Difficulties welding copper and steel are connected with its physical and chemical properties, high affinity of copper to oxygen, the low temperature of melting of copper, considerable absorption by liquid copper of gases, various sizes of coefficients of heat conductivity, linear expansion etc. In view of high heat conductivity of copper the most part of heat entered at welding is removed from heat input zone that leads to necessity of supply to a place of welding considerably a more heat, than at welding other metals. More rational is the local heating. Using impulse heating of welded details at welding copper and steel instead of gas flame lowers carbonization of details’ surfaces. Uniformity of welded details microstructure is provided. Welding defects caused by non-uniform heating are eliminated.