Robotic CMT arc braze welding of 10CrMo9-10 steel tubes with internal copper lining

Abstract

The article presents issues related to arc braze welding of tubes made of 10CrMo9-10 (10H2M) boiler steel lined inside with copper. In addition, the study points to possibilities of producing joints using conventional and innovative welding methods as well as presents results of radiographic, metallographic and mechanical tests (static tensile test, technological bending test, hardness measurements) of braze welded joints made using a robotic braze welding stand and the CMT (Cold Metal Transfer) method.

Assessment of structure and selected mechanical properties of braze welded joints of copper-lined steel tubes

“…Generally, its melting point corresponds to that of the lower-melting base material [10,11]. If the difference between melting points of the filler metal and the base material is small, it is not always possible to avoid partial melting of the edge of the lower-melting material [14]. For brazing the 10CrMo9-10 steel tube with copper lining, the silicon bronze CuSi3 in the form of dia.…”