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Welding method of duplex stainless steels

A duplex stainless steel, welding method technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., to achieve the effect of reducing welding spatter and beautiful weld formation

Inactive Publication Date: 2011-04-20
宋卫国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently few duplex stainless steel welded with carbon dioxide gas at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Taking the pipe joint with a wall thickness of 9 mm as an example, 99.99% argon inert gas protection is used to perform manual tungsten argon arc welding. The polarity is DC positive connection, the molten pool shielding gas is 99.99% argon, the flow rate is 14 liters / min, the back shielding gas is 99.99% argon, the argon arc welding wire is Lincoln LNT4462φ2.0, AWSA5.9: ER2209, and the tungsten pole is thorium Tungsten electrode φ2.4, ANSI / AWSA5.12-92, the welding position is fixed horizontally, the wall thickness is 9 mm, the joint is formed as a butt V-shaped joint, the bevel angle is 60°, the blunt edge is 1 mm, and the gap is 4 mm. Fix the assembled workpiece horizontally on the welding frame, seal the nozzle and only leave the gas inlet and outlet, and pass argon gas in the tube as a protective gas for 4 minutes, and the gas flow rate is 8 liters per minute; certified welders conduct bottom welding at a current of 80 Ampere, voltage is 12 volts, welding speed is ...

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Abstract

The invention belongs to a welding method of duplex stainless steels, comprising the following steps of backing welding, filling welding and cosmetic welding. 99.99% of argon inert gas shield is used for performing the backing welding of the manual tungsten electrode argon tungsten-arc welding, or gas shield formed by adding 80% of argon and 20% of carbon dioxide gas is used for performing semi-automatic filling and cosmetic welding. The welding method of the duplex stainless steels has the advantages that mechanical properties and corrosion resistance of welding joints can be fully ensured, welding spatters are reduced, and weld shaping is beautiful.

Description

technical field [0001] The invention belongs to a duplex stainless steel welding method. Background technique [0002] Duplex stainless steel is an alloy material based on ferrite and austenite. It has high strength, good toughness and strong corrosion resistance. It has been widely used in offshore oil and petrochemical industries at home and abroad. In its matrix structure, the proportion of ferrite and austenite is relatively balanced, not only has very good corrosion resistance, but also when welding, the proportion will not change much if the correct welding process is selected, so The intergranular corrosion resistance of the weld seam and the heat-affected zone is also very good, and no hot cracks will occur. However, as a new type of steel, duplex stainless steel is required to avoid contact with other iron-based metals during transportation, loading and unloading, storage, processing, and use in practical applications, which will affect its corrosion resistance. D...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/095B23K33/00B23K35/38B23K9/167B23K103/04
Inventor 宋卫国
Owner 宋卫国
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