Metal composite pipe and preparation method thereof

Abstract

The invention discloses a metal composite pipe and a preparation method thereof. The composite pipe comprises an inner-layer pipe (1) and an outer-layer pipe (2). The composite pipe is characterized in that the inner-layer pipe (1) is molded from a first metal band and is formed through first-time welding; the outer-layer pipe (2) is formed by closely attaching a second metal band to the outside of the inner-layer pipe (1) and performing second-time welding; second-time welding is cladding welding; the inner-layer pipe (1) and the outer-layer pipe (2) are welded together; and a first welding seam (1.1) formed through first-time welding is not overlapped with a second welding seam (2.1) formed through second-time welding. According to the metal composite pipe and the preparation method thereof, the two-time molding and two-time welding manner is adopted, and the welding seams formed through two-time welding are not overlapped through change in the welding processes, so that multiple potential quality hazards caused easily by overlapping of the welding seams are avoided; and production of stainless steel bands with the thickness being only 0.1 mm is realized with the strict and innovative control technology, the excellent performance of the metal composite pipe is guaranteed, the cost is greatly reduced, and the metal composite pipe is worthy of popularization.

Description

Technical field [0001] The invention relates to a pipe making process, in particular to a metal composite pipe and a preparation method thereof. Background technique [0002] Stainless steel outer composite pipe is a newly developed steel pipe variety. The pipe-making material, namely the stainless steel composite material, uses ordinary carbon steel as the base material, and stainless steel as the cladding material. Through metallurgical bonding, the base layer (carbon steel) has sufficient structural strength, and the cladding (stainless steel) has sufficient corrosion resistance. New stainless steel composite material with better decorative properties. The stainless steel outer composite pipe uses a stainless steel layer as the outer surface layer of the pipe, which has decorative and corrosion resistance, and uses carbon steel as the inner surface layer of the pipe, which has sufficient mechanical strength. In the related composite material pipe making technology, the stain...

AI Technical Summary

Problems solved by technology

There are the following disadvantages: the welding process is complicated: the groove needs to be set in advance, and after the carbon steel weld is welded, the groove needs to be machined on the weld, and then the stainless steel welding is performed; the consumption of welding materials is large: the welding efficiency is low: many times Repeated processing, and the welds formed on the inner and outer layers are overlapping positions, which are prone to structural mechanical defects

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