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SMAW (shielded metal arc welding) process method for steel plates with 9% of Ni

An electrode arc welding and process method technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of low temperature toughness of magnetic bias blowing, high equipment dependence, difficulty in implementation, etc., and achieve easy operation, quality assurance, Effect of Solving Welding Defects

Inactive Publication Date: 2016-06-08
WUHAN YIYE STEEL STRUCTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its own characteristics, this steel type is prone to cold cracks, hot cracks, magnetic deflection blowing and low-temperature toughness decline during the welding process, and it is highly dependent on equipment, so it is difficult to realize it during on-site construction.

Method used

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  • SMAW (shielded metal arc welding) process method for steel plates with 9% of Ni
  • SMAW (shielded metal arc welding) process method for steel plates with 9% of Ni

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Embodiment Construction

[0019] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 1 , figure 2 As shown, the reference signs are as follows: 1 is the bottom weld bead, 2-4, 7, 8 is the filling weld bead, 5-6, 9-11 is the cover weld bead, 12 is 9% Ni steel plate, 13 Be a large groove, 14 is a small groove, and 15 is a blunt edge.

[0021] In view of the welding process of common stainless steel is not suitable for welding 9%Ni steel plate, the present invention is realized like this:

[0022] 1. Preparation before welding

[0023] 1. Selection of welding equipment and electrodes

[0024] The welding machine is an AC welding machine, the welding rod is ENiCrFe-9, the diameter is 3.2mm, and it is dried before welding. The drying temperature is 300 ° C ~ 350 ° C, and the drying time is one hour. If a good electrode is not used for more than four hours, it sh...

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Abstract

The invention discloses an SMAW process method for steel plates with 9% of Ni. The process method is characterized in that an alternating current welding machine is adopted as a welding machine, nickel-based welding rods ENiCrFe-9 are adopted as welding rods, the diameter of the welding rods is 3.2 mm, drying treatment is performed before welding, and the welding rods are placed in an insulation barrel after drying to be available for any time; single edge grooves are opened in single edges of two steel plates with 9% of Ni requiring welding correspondingly, blunt edge thickness is reserved, gaps are reserved during opposite point welding assembly of the two steel plate groups with 9% of Ni requiring butt welding, X-shaped grooves are formed, rust, oil contamination and burrs on the surfaces of the grooves and in the vicinity of 20-30 mm are cleaned with a polishing machine and a file before welding, and metal luster is exposed; during welding, one surface with a large groove is welded firstly, turn-over back gouging is performed according to the workpiece deformation condition after 3-5 layers of welding, one surface with a small groove is fully welded by one time, and the other surface is turned to and the large groove is fully welded by one time. According to the SMAW process method for the steel plates with 9% of Ni, the welding process is optimized, and site construction is realized conveniently.

Description

technical field [0001] The invention belongs to the technical field of 9% Ni steel plate welding, in particular to an electrode arc welding process for 9% Ni steel plate. Background technique [0002] Natural gas is transported and stored in a liquid state, which is liquid at -165°C. With the adjustment of my country's energy strategic layout, liquefied natural gas (LNG) will become an increasingly important energy source in my country. In order to be able to transport and store LNG at low temperature, 9% Ni steel (low temperature steel) needs to be used as storage tank material. [0003] 9% Ni steel is a low-carbon steel with a nickel content of 9%, which has good low-temperature toughness and fracture toughness, and is widely used in LNG and liquid nitrogen and other fields. Due to its own characteristics, this steel type is prone to cold cracks, hot cracks, magnetic deflection blowing, and low-temperature toughness decline during the welding process, and it is highly de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/235
CPCB23K9/23B23K9/235B23K2101/18
Inventor 闵晓峰白晓良莫芝林唐谱洪张舟
Owner WUHAN YIYE STEEL STRUCTURE
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