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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 problems of limited welding use, no submerged arc welding wire and flux for duplex stainless steel welding, and high welding heat input.

Active Publication Date: 2010-12-15
NANJING BAOSE
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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
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  • 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 accompanied with drawings are described in detail below.

[0017] This example mainly includes the following steps:

[0018] 1) Selection of welding material: on the basis of selected welding wire, look for a combination of welding wire and flux with domestic duplex stainless steel welding wire H03Cr22Ni8Mo3N (ER2209); select 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 Ф4.0mm is used as the welding wire for ordinary duplex stainless steel submerged arc welding (SAW); select the appropriate flux in the flux, select the alkalinity 1.8-2.3, and the specification 8-40 Purpose SJ601 produced by Antai Technology for stainless steel welding in China is used as a duplex steel submerged arc welding (SAW) flux;

[0019] 2) Groove processing and preparation ...

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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 of welding 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] Duplex stainless steel, as a stainless steel containing two phases of ferritic and austenitic, has the advantages of both ferritic and austenitic stainless steels. The excellent toughness and weldability of austenitic stainless steels are compared with ferritic stainless steels. The combination of higher strength and chloride stress corrosion resistance makes this type of steel have the characteristics of austenitic and ferritic stainless steel: plasticity, higher toughness, no room temperature brittleness, and intergranular corrosion resistance. , Good welding performance, brittleness at 475℃, high thermal conductivity and superplasticity. At the same time, it has high strength and resistance to intergranular corrosion and chloride stress corrosion. Mainly has exc...

Claims

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Application Information

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Patent Type & Authority Applications(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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