Composite tube manufacturing method and device

Abstract

The invention discloses a composite tube manufacturing method and device. The method comprises the following steps: performing groove preparation on opposite edges of a composite board, and adopting an X-shaped composite groove, wherein a base groove is V-shaped, the composite groove is X-shaped; pre-determining optimal welding parameters through experiment, adopting high-frequency induction welding to complete the composite layer, removing induction welding external burrs after composite-layer welding, clearing the base-layer groove, adopting multi-wire submerged-arc welding on the base-layer welding, thereby accomplishing post-welding treatment such as thermal treatment after welding. The composite layer composite-layer welding adopts high-frequency induction welding, and metal filling is not needed, so that formation of impurities such as intermetallic compounds is effectively avoided, corrosion resistance of the composite layer is ensured, welding material cost is reduced; and the base-layer welding adopts multi-wire submerged-arc welding, and an equal-strength matched welding material is selected, so that strength and toughness requirements of the base layer are ensured. The composite tube manufacturing method effectively avoids mutual dilution between base-layer metal and composite-layer metal, improves combining strength of a base-layer welding seam and a composite-layer welding seam, and achieves the purposes of reducing consumption and improving efficiency.

Description

technical field [0001] The invention relates to the field of steel pipe manufacturing, in particular to a composite pipe manufacturing method and a device thereof. Background technique [0002] Composite pipe has the characteristics of high pressure resistance of the base layer and corrosion resistance of the coating, and is widely used in H 2 S / CO 2 Exploitation and transportation of sour oil and gas. At present, the manufacturing methods of composite pipes are mainly divided into forming first and then compounding, synchronous compound forming, and first compounding and then forming. Composite after forming first means that the base pipe and the cladding pipe are combined to form a composite pipe, such as a manufacturing method and device for a metal seamless composite pipe blank with a notification number of CN101428388B and a manufacturing process for an explosive composite pipe with a notification number of CN103639584B, etc. The main disadvantage of this method is t...

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Problems solved by technology

Composite after forming first means that the base pipe and the cladding pipe are combined to form a composite pipe, such as a manufacturing method and device for a metal seamless composite pipe blank with a notification number of CN101428388B and a manufacturing process for an explosive composite pipe with a notification number of CN103639584B, etc. The main disadvantage of this method is that the bonding strength between the base layer and the cladding layer is not high, and the bonding layer is prone to problems such as microcracks.

Synchronous composite molding refers to the production of composite pipes by adopting casting methods, such as a bimetallic composite pipe casting method for which the notification number CN108160952A and a casting sand box and a double-liquid bimetallic composite pipe with the notification number CN104646644A, etc. The main defect of this method is that The process is complicated, the efficiency is low, and the thickness of the base layer and the cladding layer cannot be precisely controlled

Composite first and then forming means that the composite plate is made into a composite pipe by welding, such as the welding method of a metallurgical composite pipe for oil and gas transportation with the notification number CN108637438A and the ring of a thin-walled stainless steel composite pipe with the notification number CN101633074. Weld seam welding method, etc. In this method, due to the filler welding of different welding materials used in the base welding and multi-layer welding, there are too many impurities such as intermetallic compounds between the base welding seam and the multi-layer welding seam, and the strength of the overall weld seam is not high.

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