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Two phase stainless steel submerged-arc welding SAW welding procedure

A duplex stainless steel and welding process technology, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of domestic duplex stainless steel submerged arc welding process and immature combination of welding materials, high welding heat input, and no duplex Submerged arc welding wire and flux for stainless steel welding

Active Publication Date: 2012-08-29
NANJING BAOSE
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  • Application Information

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Problems solved by technology

Due to the high welding heat input of submerged arc welding, and the immature combination of domestic duplex stainless steel submerged arc welding process and welding materials, its welding use is limited
Therefore, in addition to the welding methods SMAW and GTAW with small heat input, there is no welding process for duplex stainless steel welding, which is an efficient welding method such as submerged arc welding, and there is no one dedicated to duplex stainless steel welding. Submerged arc wire and flux combinations for stainless steel welding

Method used

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  • Two phase stainless steel submerged-arc welding SAW welding procedure
  • Two phase stainless steel submerged-arc welding SAW welding procedure
  • Two phase stainless steel submerged-arc welding SAW welding procedure

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Embodiment Construction

[0016] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with accompanying drawings.

[0017] This example mainly includes the following steps:

[0018] 1) Selection of welding materials: On the basis of the selected welding wire, look for the domestic duplex stainless steel welding wire H03Cr22Ni8Mo3N (ER2209) to form a combination of welding wire and flux. Select the chemical composition WNi≥8.0%, WCr≥22.5%, WMo≥3.0%, WN≥ 0.14% of the specific H03Cr22Ni8Mo3N (ER2209) welding wire with a specification of φ4.0mm is used as a welding wire for submerged arc welding (SAW) of ordinary duplex stainless steel; the appropriate flux is selected in the flux, the alkalinity is 1.8-2.3, and the specification is 8-40 mesh SJ601 produced by Antai Technology, which is used for stainless steel welding in China, is used as a duplex steel submerged arc welding (SAW) flux;

[0...

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Abstract

The invention relates to an economic and practical submerged arc welding procedure applicable to welding of common two phase stainless steel 022CrNi5Mo3(S31803 and S2205). The invention is characterized in that the procedure includes the following steps: 1) the performance characteristics of two phase stainless steel are researched; 2) welding material is selected and welding procedure is determined; 3) welding edge preparation is carried out; 4) clean-up and final inspection are carried out on the surface of work piece to be welded; 5) submerged arc welding is carried out on the common two phase stainless steel. The invention is based on research of chemical constituents and performance characteristics of common two phase stainless steel, economic and practical domestic submerged arc welding material combination applicable to common two phase stainless steel and reasonable submerged arc welding procedure are selected, and the invention has the advantage that efficient welding of two phase stainless steel is realized by adopting high line energy submerged arc welding. Welding of common two phase stainless steel is carried out by adopting the invention, the chemical constituents ofwelding line can be ensured to meet standard requirement, ferrite content of welding joint (including welding line and heat affected zone) is controlled to be 30-65%, and the welding joint has good mechanical properties and pitting corrosion resistance.

Description

technical field [0001] The invention relates to a submerged arc welding welding material combination, in particular to a duplex stainless steel submerged arc welding SAW welding process. Background technique [0002] As a stainless steel containing two phases of ferrite and austenite, duplex stainless steel has the advantages of both ferrite and austenitic stainless steel, and combines the excellent toughness and weldability of austenitic stainless steel The combination of high strength and chloride stress corrosion resistance makes this type of steel have the characteristics of both austenitic and ferritic stainless steel: it has plasticity, higher toughness, no room temperature brittleness, and intergranular corrosion resistance. , Good welding performance, brittle at 475°C, high thermal conductivity and superplasticity. At the same time, the strength is high and the intergranular corrosion resistance and chloride stress corrosion resistance are significantly improved. M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/00B23K9/167B23K9/18B23K9/23B23K9/235B23K9/095
Inventor 杜永勤王建平詹典斌卓下文
Owner NANJING BAOSE
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