Longitudinal seam red copper liner welding process of steel sheet pressure vessel and red copper liner used by same

Abstract

The invention discloses a longitudinal seam red copper liner welding process of a steel sheet pressure vessel. The longitudinal seam red copper liner welding process sequentially comprises the steps of (a), aligning and splicing a longitudinal seam of a machined cylinder and carrying out point welding fixation; (b), placing the inner longitudinal seam of the machined cylinder on a red copper liner; (c), aligning the longitudinal seam of the machined cylinder to the center line of a welding groove of the red copper liner, fixing the machined cylinder and the red copper liner through an air cylinder, and guiding water into a cooling water pipe of the red copper liner; (d), carrying out welding; (e), disassembling the machined cylinder after the longitudinal seam of the machined cylinder is welded. The welding process has the advantages that automatic submerged arc welding of one-side welding and two-side forming is achieved, the RT flaw detection qualification rate is high, welding flux is saved, the manufacturing quality of the steel sheet pressure vessel is improved, and the production cost is lowered.

Description

technical field [0001] The invention relates to a welding process of a pressure vessel, in particular to a welding process of a red copper liner for a longitudinal seam of a steel sheet pressure vessel and the used red copper liner. Background technique [0002] The diameter of the steel sheet pressure vessel is generally 250-600mm, the material is Q235-B, and the wall thickness is 3-5mm; it is used in the production of industrial and mining enterprises, mainly including air compressor storage tanks, air purification series degreasers, and oil-gas separators , Flange air filter, air heat exchanger and other products. [0003] At present, steel sheet pressure vessels are widely used in my country's industrial production, and the demand is huge. In recent years, the number of steel sheet pressure vessels manufactured by our company has increased by 30% every year, and the annual output has exceeded 10,000 units. Since the welding of the longitudinal seam and the circumferent...

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Problems solved by technology

[0006] (1) The surface shape of the longitudinal weld in the cylinder is not ideal, such as the weld seam has surface defects such as undercut, slag inclusions, unsmooth transition with the base metal, and weld bead;

[0007] (2) The qualified rate of RT flaw detection of the longitudinal seam of the cylinder is relatively low, and the repair rate is relatively high;

[0008] (3) The consumption of flux materials is large, which increases the cost of product manufacturing

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