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Summary
This paper presents an investigation of the welding of copper with a copper filler using the TIG process. Copper sheet of 6 mm thickness was welded in various protective atmospheres: 100% He, 100% Ar and mixtures of both gases. Radiographic analysis of specimens welded with 100% He and 100% Ar shows no porosity in the bead, while with different mixtures of gases, porosity was uniform. Metallography shows dendritic structures and recrystallised grains size ASTM 2 in the welded and heat affected zones. Tensile strength testing using an INSTRON machine revealed tensile strengths between 227 M Pa in 100% He atmosphere and 174 MPa in 60% He/40% Ar mixture. For elongation at rupture, the best values, approximately 36%, were obtained with pure gases. It is concluded that welding of copper with copper filler is possible without losing the mechanical and metallurgical properties of the base metal.