Plasma welding technology of duplex stainless steel 2507 with bypass wire feeding

A duplex stainless steel, plasma welding technology, used in plasma welding equipment, welding equipment, welding equipment and other directions, can solve the problems of ferrite grain growth and mechanical properties of welded joints, etc., to improve stability and reduce heat. Influenced zone and thermal deformation, the effect of preventing weld through

Active Publication Date: 2019-09-20
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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  • Plasma welding technology of duplex stainless steel 2507 with bypass wire feeding
  • Plasma welding technology of duplex stainless steel 2507 with bypass wire feeding
  • Plasma welding technology of duplex stainless steel 2507 with bypass wire feeding

Examples

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 technical field of welding, and discloses a plasma welding technology of duplex stainless steel 2507 with bypass wire feeding. The plasma welding technology comprises the following process steps of: step (1), cutting steel plates; step (2), selecting welding wires; step (3), pretreating the steel plates; step (4), splicing and positioning the steel plates; step (5), installing a back protective tooling; step (6), filling a back protective gas; and step (7), welding, wherein the welding process parameters are as follows: the polarity of a power supply of plasma-arc welding equipment is straight polarity direct current; the tungsten electrode of a plasma-arc welding gun is cerium-tungsten electrode WCe-20, and the diameter Phi of the plasma arc welding gun is 4.0mm; the back protective gas and the welding front protective gas are the mixed gas of 98% of argon and 2% of nitrogen; plasma gas and drag cover gas are argon with the purity grade of 99.99%; the flow rate of the plasma gas is 5.5-6.0L/min; the flow rate of the welding front protective gas and the drag cover gas is 25-30L/min; the welding current is 220-240A; the voltage is 27-29V; the welding speed is 19-21cm/min; and the heat input is 1.02-1.32KJ/mm. The plasma welding technology can improve the welding efficiency, reduces the production cost, and meanwhile improves the quality of welding.

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 Applications(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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