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Welding process of super duplex stainless steel rebars

A technology of duplex stainless steel and welding process, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of heavy workload, hinder the popularization and application of super duplex stainless steel rebar, achieve convenient operation and save groove processing The effect of process and forming quality is good

Active Publication Date: 2020-10-13
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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  • Welding process of super duplex stainless steel rebars
  • Welding process of super duplex stainless steel rebars

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 of super duplex stainless steel rebars. The welding process comprises the following steps that (1) the gap between the super duplex stainless steel rebars is controlled at 15 mm, and a rebar joint is placed in a U-shaped groove of a copper mold, wherein the diameter of the U-shaped groove is slightly larger than the diameter of the rebars; and (2) mixed gasshielded welding is used for welding, wherein the composition of welding gas is: 93%-97% of Ar, 3%-5% of N2, and 0-2% of He, the welding current is 180 A-200 A, the welding voltage is 25-27 V, the gas flow is 20-25 L / min, the welding speed is 30-35 cm / min, and the welding heat input is 5.4-7.5 kJ / cm. Through adopting the welding process, the super duplex stainless steel rebars with the diameter of 16 mm can be welded, so that mechanical properties and corrosion resistance of welded joints can be matched with base materials. The process can be used for welding of super duplex stainless steel rebars for marine structures, and the service life of the marine structures is improved.

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 Applications(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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