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A welding process for thick-walled beams and columns of marine engineering equipment

A marine engineering and welding process technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of high consumption of welding materials, easy generation of cracks and pores, and wide groove, so as to save welding materials and improve welding quality The effect of controlling and improving work efficiency

Active Publication Date: 2016-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent with the notification number CN101879645B is a process method for submerged arc welding of large and thick steel plates in low-temperature environment marine engineering. The groove is X-shaped or K-shaped. -G", the filling and covering welding method is submerged arc automatic welding "SAW". Such a welding process has a wide groove, consumes a lot of welding materials, has low efficiency, and is prone to cracks and pores, so it cannot be guaranteed in the marine environment. For normal operations, especially for beams and columns with a wall thickness of 50-215mm, the welding process needs to be further improved

Method used

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  • A welding process for thick-walled beams and columns of marine engineering equipment
  • A welding process for thick-walled beams and columns of marine engineering equipment

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Embodiment 1

[0019] A welding process for thick-walled beams and columns of marine engineering equipment in the present invention comprises the following steps:

[0020] 1) Selection of welding wire: You can choose the corresponding welding wire according to the difference of welding beams and columns (plates), usually choose H08A or H10Mn2, in this embodiment, choose H08A.

[0021] 2) Cutting and blanking.

[0022] 3) Groove processing: For the welding groove of thick-walled beams and columns, the longitudinal seam can be processed into a narrow U shape by using a planer or milling machine, and the circular seam can be processed into a narrow U shape by a vertical lathe. The angle of the U-shaped groove is 2°, and the arc radius of the bottom of the groove is 10mm.

[0023] 4) Preheating before welding: Before preheating, remove the oxide layer, slag, water, oil and other impurities on the groove surface and both sides; before welding, use flame heating or electric heating to weld Carry...

Embodiment 2

[0028] A welding process for thick-walled beams and columns of marine engineering equipment in the present invention comprises the following steps:

[0029] 1) Selection of welding wire: The corresponding welding wire can be selected according to the difference of welding beams and columns (plates), usually H08A or H10Mn2 is selected, and in this embodiment, H10Mn2 is selected.

[0030] 2) Cutting and blanking.

[0031] 3) Groove processing: For the welding groove of thick-walled beams and columns, the longitudinal seam can be processed into a narrow U shape by using a planer or milling machine, and the circular seam can be processed into a narrow U shape by a vertical lathe. The angle of the U-shaped groove is 4°, and the arc radius of the bottom of the groove is 12mm.

[0032] 4) Preheating before welding: Before preheating, remove the oxide layer, slag, water, oil and other impurities on the groove surface and both sides; before welding, use flame heating or electric heati...

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Abstract

The invention discloses a process of welding thick-walled beam columns of marine engineering equipment, which includes the following steps: blanking, groove machining, preheating before welding, filling layer welding, post heat treatment and non-destructive inspection. The longitudinal seam grooves and circumferential seam grooves of the thick-walled beam columns are narrow U-shaped; narrow-gap submerged arc welding is adopted as filling layer welding, and interlayer temperature is controlled at 150 DEG C to 250 DEG C during welding. Since the grooves are narrow U-shaped and narrow and narrow-gap submerged arc welding is adopted, not only can working efficiency be increased, but also welding materials can be saved, and compared with conventional welding processes, the process can save 40 percent of welding materials; and meanwhile, the invention decreases welding stress, improves the comprehensive mechanical properties of welded joints, and enhances the crack resistance of welded joints.

Description

technical field [0001] The invention relates to the technical field of welding of marine engineering equipment, in particular to a welding process for thick-walled beams and columns of marine engineering equipment. Background technique [0002] Ocean engineering equipment is a very large steel structure, and the manufacturing material is thick and high-strength. High-efficiency welding technology must be used in the manufacturing process to meet its strict requirements in terms of corrosion resistance, stability and safety, so as to ensure its For normal operations in the marine environment. The difficulty of welding technology for marine engineering equipment is mainly that the manufacturing materials are mostly thick steel plates and the materials have high strength. If ordinary welding techniques are used, the requirements of marine equipment cannot be met. The existing manufacturing process of offshore engineering equipment includes material selection, beveling, welding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K9/18B23K9/02
Inventor 吕远锋梁强李俊益邱华勇刘奕炬秦芳珍肖海元杨明来梁文伟蒋正勇苏东伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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