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Nickel-based high-corrosion-resistance composite steel pipe welding method

A composite steel pipe and welding method technology, applied in the field of iron and steel material welding, can solve the problems of welding materials and welding process complexity, etc., and achieve the effect of improving welding efficiency, improving work efficiency, and ensuring strength and toughness

Inactive Publication Date: 2020-09-15
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, submerged arc welding and manual arc welding are used for the circular seam, and different welding methods complicate the selection of welding materials and welding processes

Method used

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  • Nickel-based high-corrosion-resistance composite steel pipe welding method
  • Nickel-based high-corrosion-resistance composite steel pipe welding method
  • Nickel-based high-corrosion-resistance composite steel pipe welding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Adopt welding method of the present invention, first carry out the location pre-welding of L450MS steel, carry out double-sided welding (inner welding and outer welding) of L450MS steel successively with manual welding again, carry out non-melting extremely inert gas to transition layer metal and coating metal at last Tungsten arc welding (TIG).

[0024] The welding process parameters of manual welding are as follows:

[0025] Table 1 SMAW welding process parameters

[0026]

[0027] Table 2 SAW welding process parameters

[0028]

[0029] The performance test results are as follows:

[0030] Table 3 Tensile test results of SMAW welded joints

[0031]

[0032] The fracture position of the welding test and the tensile test of the two methods are all on the base metal. The standard requires: the strength of the welded joint of Rm 535-760MPa is not lower than that of the base metal, and the strength of the welded joint is qualified.

[0033] Table 4 Impact tes...

Embodiment 2

[0047] Adopt the welding method of the present invention, first carry out the pre-positioning welding of L450MS steel, then carry out the double-sided welding of L450MS steel successively with submerged arc automatic welding, and finally carry out non-melting inert gas tungsten electrode shielded welding to the transition layer metal and cladding metal ( TIG).

[0048] welded joint tension

[0049] Table 6 Tensile test results of SAW welded joints

[0050] Sample No Sample size / mm Rm / MPa Fracture site NG 19×25×360 607 base material NG 19×25×360 600 base material BJ 19×25×360 610 base material

[0051] The impact test results of each part of the steel plate welded joint are shown in Table 7.

[0052] Table 7 Impact test results of SAW welded joints

[0053]

[0054] The technical requirements are that the single value of weld and HAZ is ≥38J, and the average value is ≥45J. It can be seen from the results that the impact toug...

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Abstract

The invention discloses a nickel-based high-corrosion-resistance composite steel pipe welding method. According to the welding method, through reasonable groove design, an N08825 / L450MS composite steel pipe is welded through base layer positioned welding and double-face SAW welding or double-face SMAW welding and cladding TIG welding, the welding efficiency is improved, the mechanical property ofa welding joint is matched with that of base metal, the requirement for the corrosion resistance of the welding joint is met while the toughness of the welding joint is guaranteed, and meanwhile the working efficiency can be improved. Tests show that by the adoption of the welding method, various mechanical properties of the welded joint can meet the standard requirements. Intergranular corrosion,pitting corrosion and HIC corrosion tests are carried out on the composite pipe welding joint, the intergranular corrosion rate and the pitting corrosion rate both meet the standard requirements, andcracks do not appear in the HIC tests.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and in particular relates to a welding method for a nickel-based high-corrosion-resistant composite steel pipe. Background technique [0002] During the use of N08825 / L450MS pipeline clad plate, girth welding has become a key control process. In order to ensure the comprehensive performance of the clad steel plate, it is necessary to weld the base layer and cladding separately to ensure the performance. A transition layer of weld metal is also required between the base weld and the cladding weld. The welding of the transition layer is to compensate for the reduction of alloy elements caused by dilution, so that the weld metal of the cladding layer still maintains the composition of N08825 steel to ensure its corrosion resistance. Therefore, the selection of welding materials for the transition layer and the implementation of the welding process will have a significant imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/167
CPCB23K9/16B23K9/167B23K9/18
Inventor 李松李伟彭思远吴君明李定金
Owner NANJING IRON & STEEL CO LTD
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