Production technology of pipes with high welding quality and method thereof

Abstract

The invention provides production technology of pipes with high welding quality and a method thereof. Pipe material is prepared by, by weight percent, 0.6-1.2% of Mg, 0.7-1.6% of Si, not larger than 0.15% of Fe, 0.05% of Cu, 1.5%-2% of Mn, 0.05-0.12% of Cr, 0.5-1% of Zn, and 0.02-0.05% of Ti, the remainder comprising Al and inevitable metal and nonmetal impurity elements. The method comprises thesteps of adding the prepared material into a melting furnace to prepare molten aluminum alloys into cast rods, heating the cast rods to 550-560 DEG C, keeping the heating time for 10-12 hours for heattreatment, adopting high-temperature extrusion when the pipes are extruded so as to ensure good welding, enabling the upper limit of an ingot heating temperature to be slightly lower than an alloy low melting point eutectic melting temperature, adopting high-temperature felt for a material discharging slide-out table, and performing quenching by adopting a strong wind cooling mode. By controllingthe composition of the cast rods, an extrusion temperature, an extrusion speed, quenching cooling and a mold structure, the production technology of the pipes with high welding quality and the methodthereof have the advantages of improving the welding quality and stability of products, saving resources, and reducing the cost.

Description

technical field [0001] The invention relates to the technical field of pipe production, in particular to a production process and method for pipes with high welding quality. Background technique [0002] When the pipe is extruded, along the extrusion direction at the confluence position of the metal, strips, linear defects or incompletely welded defects appear on the decorative surface of the product. The depth is from the surface to the back through the entire thickness. Through corrosion and Anodizing can be found to be similar to organizational stripes with the naked eye, and the confluence is a striped pattern, which can be distinguished by comparing the mold structure, which is mainly caused by the difference in the structure of the welded part of the metal flow in the extrusion die and other parts. Caused, or caused by the insufficient supply of aluminum in the mold welding cavity during extrusion, unreasonable design of the die hole, or improper cutting of the residua...

AI Technical Summary

Problems solved by technology

[0002] When the pipe is extruded, along the extrusion direction at the confluence position of the metal, strips, linear defects or incompletely welded defects appear on the decorative surface of the product. The depth is from the surface to the back through the entire thickness. Through corrosion and Anodizing can be found to be similar to organizational stripes with the naked eye, and the confluence is a striped pattern, which can be distinguished by comparing the mold structure, which is mainly caused by the difference in the structure of the welded part of the metal flow in the extrusion die and other parts. Caused, or caused by the insufficient supply of aluminum in the mold welding cavity during extrusion, unreasonable design of the die hole, or improper cutting of the residual material, the residual material in the shunt hole and diversion hole is partially taken out, extrusion The gas in the time gap enters the surface, or the extrusion speed is too fast during the filling stage, the exhaust is not good, the air is drawn into the metal, and the original discharge material slides out. When using graphite products, the side that is in contact with graphite will dissipate heat If it is not timely, the local temperature rises, which accelerates the growth of the grains at the weld seam on the surface, and the profile is prone to black bands after oxidation. Aiming at this problem, a production process of high-quality welded pipes and its its method