A plasma welding process of duplex stainless steel 2205 with bypass wire feeding

A duplex stainless steel and plasma welding technology, which is applied in plasma welding equipment, welding equipment, welding equipment, etc., can solve the problems of reducing the comprehensive performance of duplex stainless steel 2205, affecting the accuracy of the two-phase structure ratio, and poor cooling control stability. , to achieve the effect of improving corrosion resistance, preventing weld penetration, improving efficiency and quality

CN110253125BActive Publication Date: 2021-01-26CHENGXI SHIPYARD XINRONG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-01-26

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Abstract

The invention relates to the technical field of welding, and discloses a plasma welding process of duplex stainless steel 2205 with bypass wire feeding, comprising 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 protective gas, (7) welding; the welding process parameters are: the polarity of the power supply of the plasma arc welding equipment is DC positive connection, plasma arc welding equipment The tungsten electrode type of the arc welding torch is cerium tungsten electrode WCe‑20, and the diameter is φ4.0mm; the back shielding gas and the welding front shielding gas are a mixture of 98% argon and 2% nitrogen, plasma gas, hood gas It is argon gas with a purity grade of 99.99%; the plasma gas flow rate is 5.5~6.0L / min, the flow rate of the welding front shielding gas and the hood gas are both 25~30L / min, the welding current is 220~240A, the voltage is 26~28V, and the welding speed is 19~21cm / min, heat input 0.98-1.27KJ / mm. The invention can improve welding efficiency, reduce production cost and improve welding quality at the same time.
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Description

technical field

[0001] The invention relates to the field of welding technology, in particular to a plasma welding process of duplex stainless steel 2205 with bypass wire feeding. Background technique

[0002] Duplex stainless steel 2205 is a composite stainless steel composed of 22% chromium, 3.3% molybdenum and 5.8% nickel-nitrogen alloy. It has high strength, good impact toughness and good overall and local stress corrosion resistance. Compared with the first-generation duplex stainless steel, 2205 duplex stainless steel further increases the nitrogen content to enhance the stress corrosion resistance and pitting resistance in acidic media with high chloride ion concentration. Nitrogen is a strong austenite forming element, adding to duplex stainless steel can not only improve the strength of steel, but will not significantly damage the plasticity and toughness of steel.

[0003] The excellent internal corrosion performance and mechanical properties of duplex stainless s...

Examples

Embodiment 1

[0063] Such as Figures 1 to 5 Shown is an embodiment of the plasma welding process of a duplex stainless steel 2205 with bypass wire feeding of the present invention, including the following process steps:

[0064] (1) Steel plate cutting: 2205 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 2205, the welding test plate is processed according to the sample size requirement of corresponding detection 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]