Growth types and bonding mechanisms for copper steel interface by rusion welding

Abstract EN

The aim of this work is to study the possibility of joining copper (ASTM , C1020100) to low carbon steel (ASTM A36) using the shielded metal arc welding (SMAW) and the gas tungsten arc welding (GTAW) processes by eight types of electrodes ; ERNiCrFe-5, ERNiCu-7, ECu, ECuSn-A, E309L, E 312, E7018 , and ENi-1.

Joint is designed as single – V – butt weld for 5 mm thickness plate.

From the microstructure observation there were two kinds of boundaries ; the first is homogenous weld, which happens when fillers with chemical composition is similar to those of one of the parent metals .

While the second type is heterogenous nucleation, which happens when the chemical compositions of the fillers and the parent metals are not similar.

Three types of solidification were regonized ; the first is epitaxial from the copper side, the second is nonepitaxial from the steel side, and the third type is competitive which shown in the two sides.

Solidification cracks on the steel side are shown, and these cracks are filled by brazing process.

All tested specimens in tension and bending show the copper properties.