Research on Defect Welding in Continuous Extrusion Process of Copper Product

Aiming at the layering defect of continuous extrusion products, the test scheme of copper defect welding was established according to the condition of continuous extrusion process. The influence of healing temperature, unit pressure and grain size on healing quality was studied. The results show that at a certain temperature, with the gradual increase of the unit pressure, the tensile strength of the healed sample at room temperature gradually increases, the healing quality is getting better and better; with the increase of healing temperature, the effect of unit pressure on room temperature tensile strength is more and more obvious. Under a certain unit pressure, when the healing temperature is between 550℃ and 600℃, the room temperature tensile strength of the sample shows an upward trend; when the healing temperature is between 600℃ and 700℃,the tensile strength of the sample at room temperature shows a downward trend. Under the same healing temperature and unit pressure conditions, the tensile strength of the fine-grained welded samples at room temperature is significantly higher than that of the casting blank（coarse-grain） healed samples.