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A welding process for super duplex stainless steel bars

A technology of duplex stainless steel and welding technology, which is applied in welding equipment, welding medium, welding equipment, etc., can solve the problems that hinder the popularization and application of super duplex stainless steel reinforcement, and the workload is large, so as to save the groove processing process and operation Convenience and guaranteed balanced effect

Active Publication Date: 2022-03-15
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the huge workload of experimental exploration, the promotion and application of super duplex stainless steel bars are hindered

Method used

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  • A welding process for super duplex stainless steel bars
  • A welding process for super duplex stainless steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Use a solid core wire with a diameter of 1.2mm to press figure 1 Connector form shown, placed in figure 2 Welding is carried out in the mold shown, the groove angle is 30°, the welding gap is 15mm, the welding current is 200A, the welding voltage is 27V, the welding speed is 30cm / min, the welding heat input is 7.5kJ / cm, and the gas flow rate is 25L / min, the protective gas is 97%Ar+3%N 2 , to make welded joints.

Embodiment 2

[0034] Use a solid core wire with a diameter of 1.2mm to press figure 1 Connector form shown, placed in figure 2 Welding is carried out in the mold shown without groove, the welding gap is 15mm, the welding current is 180A, the welding voltage is 25V, the welding speed is 30cm / min, the welding heat input is 6.3kJ / cm, and the gas flow rate is 20L / min , the protective gas is 95% Ar+3% N 2 +2% He, made into welded joints.

Embodiment 3

[0036] Flux cored wire with a diameter of 1.2mm is used to press figure 1 Connector form shown, placed in figure 2 Welding is carried out in the mold shown, the groove angle is 30°, the welding gap is 15mm, the welding current is 200A, the welding voltage is 27V, the welding speed is 35cm / min, the welding heat input is 6.5kJ / cm, and the gas flow rate is 25L / min, the protective gas is 97%Ar+3%N 2 , to make welded joints.

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Abstract

The invention provides a welding process for super duplex stainless steel bars, comprising the following steps: (1) controlling the gap between the super duplex stainless steel bars to be 15mm, and disposing the joints of the bars in U-shaped grooves of copper moulds. The diameter of the groove is slightly larger than the diameter of the steel bar; (2) The mixed gas shielded welding is used for welding, and the composition of the welding gas is: 93% ~ 97% Ar, 3% ~ 5% N 2 and 0-2% He, the welding current is 180A-200A, the welding voltage is 25-27V, the gas flow is 20-25L / min, the welding speed is 30-35cm / min, and the welding heat input is 5.4-7.5kJ / cm. By adopting the welding process of the invention, super duplex stainless steel bars with a diameter of 16mm can be welded, and the mechanical properties and corrosion resistance properties of the welded joint can be matched with the base metal. The process can be used for the welding of super duplex stainless steel bars for marine structures, so as to improve the service life of marine structures.

Description

technical field [0001] The invention relates to a welding process for super duplex stainless steel bars, which belongs to the welding field of material processing engineering. Background technique [0002] Super duplex stainless steel is a duplex stainless steel with ultra-low carbon (≤0.03%), high molybdenum (>3.5%), and high nitrogen (0.22%-0.30%) content, and its pitting resistance index is greater than 40. Super duplex stainless steel not only has excellent mechanical properties and corrosion resistance, but also has cost advantages compared with super austenitic stainless steel and nickel-based alloy materials, and is especially suitable for environments with extremely harsh corrosive environments, such as marine structures and deep sea environments Wait. [0003] The development of marine engineering has become an important direction of my country's economic development. In addition to the use of super duplex stainless steel plates in marine structures, a large amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K35/38B23K35/30B23K33/00B23K103/04
CPCB23K9/16B23K35/383B23K35/3086B23K33/004B23K2103/05
Inventor 张迪谢琦马德志刘春李俊岭
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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