A Plasma Welding Process of Duplex Stainless Steel 2507 with Bypass Wire Feeding

A dual-phase stainless steel, plasma welding technology, applied in the direction of plasma welding equipment, welding equipment, welding equipment, etc., can solve the problems of decreased mechanical properties of welded joints, ferrite grain growth, etc., to reduce heat-affected zones and heat Effects of deformation, improvement of stability, and improvement of corrosion resistance

Active Publication Date: 2021-01-26
CHENGXI SHIPYARD XINRONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the welding heat input is too small, excessive ferrite structure may be generated; if the heat input is too large, although enough austenite can be obtained, it will also cause the ferrite grains in the heat-affected zone to grow. Decrease the mechanical properties of welded joints

Method used

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  • A Plasma Welding Process of Duplex Stainless Steel 2507 with Bypass Wire Feeding
  • A Plasma Welding Process of Duplex Stainless Steel 2507 with Bypass Wire Feeding
  • A Plasma Welding Process of Duplex Stainless Steel 2507 with Bypass Wire Feeding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Such as Figures 1 to 5 Shown is an embodiment of the plasma welding process of a duplex stainless steel 2507 with bypass wire feeding of the present invention, including the following process steps:

[0064] (1) Steel plate cutting: 2507 stainless steel plate is used, which is cut and formed according to the design requirements;

[0065] (2) Selection of welding wire: use a welding wire with a diameter of φ1.2mm as the welding wire for bypass wire feeding during plasma arc welding;

[0066] (3) Steel plate pretreatment: perform surface pretreatment on the welding area of ​​the stainless steel plate before welding;

[0067] (4) Steel plate splicing and positioning: the stainless steel plates to be welded are butted, and after the butt joint, the stainless steel plates are spot welded and positioned, and the position of the spot welded positioning is located at the butt seam on the back of the stainless steel plates;

[0068] (5) Install the back protection tooling: in...

Embodiment 2

[0103] Adopt the welding process of embodiment 1, carry out the test plate welding of duplex stainless steel 2507, the welding test plate is processed according to the sample size requirement of corresponding inspection standard, with American Bureau of Shipping (ABS) material and welding code as guidance document, carry out The following items are tested, see the table below:

[0104]

[0105]

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Abstract

The invention relates to the field of welding technology, which discloses a plasma welding process of duplex stainless steel 2507 with bypass wire feeding, including the following process steps: (1) steel plate cutting, (2) welding wire selection, (3) steel plate pretreatment , (4) splicing and positioning of steel plates, (5) installing back protection tooling, (6) filling back protection gas, (7) welding; the welding process parameters are: the polarity of the power supply of the plasma arc welding equipment is DC positive, and the plasma The tungsten electrode type of the arc welding torch is cerium tungsten electrode WCe‑20, with a diameter of φ4.0mm; the back shielding gas and the welding front shielding gas are both a mixture of 98% argon and 2% nitrogen, plasma gas, drag mask gas It is argon gas with a purity level of 99.99%; the flow rate of plasma gas is 5.5-6.0L / min, the flow rate of welding front shielding gas and dragging gas is 25-30L / min, welding current is 220-240A, voltage is 27-29V, welding speed 19~21cm / min, heat input 1.02‑1.32KJ / mm. The invention can improve welding efficiency, reduce production cost and improve welding quality at the same time.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a plasma welding process of duplex stainless steel 2507 with bypass wire feeding. Background technique [0002] The sulfur emission limit rules, which will come into effect on January 1, 2020, require sulfur emissions to remain below 0.50%. Therefore, the design and construction of marine desulfurization towers will inevitably become a trend. Super duplex stainless steel 2507 (UNS S32750), which is the main material for desulfurization tower construction, is a ferritic-austenitic (duplex) stainless steel. Due to the high content of chromium and molybdenum in this steel, it has excellent properties. Excellent resistance to pitting corrosion, crevice corrosion, strong chloride corrosion resistance, high thermal conductivity and low thermal expansion coefficient, and the dual-phase microstructure ensure that the steel has a high resistance to stress corrosion cracking. , and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02B23K37/02B23K103/04
CPCB23K10/022B23K37/0252B23K2103/04
Inventor 陈日昱周军徐军峰
Owner CHENGXI SHIPYARD XINRONG
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