High-nitrogen steel hybrid welding method adopting double-sided simultaneous protection with different protective gases

A composite welding and shielding gas technology, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of unstable welding quality, etc., and achieve the effect of easy device manufacturing, flexible process and simple device

Inactive Publication Date: 2019-12-13
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical solution of the present invention is to provide a high-nitrogen steel composite welding method with simultaneous protection on both sides by different protective gases. By using different protective gases to simultaneously protect the upper and lower surfaces of the welded workpiece, the existing high-nitrogen steel fusion welding technology under normal pressure is solved. Unstable welding quality, seam porosity and nitrogen loss, improve joint strength, is a welding method suitable for mass production in engineering

Method used

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  • High-nitrogen steel hybrid welding method adopting double-sided simultaneous protection with different protective gases
  • High-nitrogen steel hybrid welding method adopting double-sided simultaneous protection with different protective gases
  • High-nitrogen steel hybrid welding method adopting double-sided simultaneous protection with different protective gases

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Double-sided shielded welding of 8.0mm thick high-nitrogen steel with different shielding gases

[0031] Step 1: Use an angle grinder to remove the oxide film on the surface of two high-nitrogen steel plates with a thickness of 8.0mm, and then use acetone to remove the surface oil stains. The high-nitrogen steel plates are prefabricated with 30° grooves and 3mm blunt edges, and the two high-nitrogen steel plates are prefabricated with welding gaps 0.6mm;

[0032] Step 2: Place two high-nitrogen steel plates on top of the copper plate with a rectangular through slot in a butt joint form, and fix the workpiece and the copper plate on the workbench with a clamp.

[0033] Step 3: Introduce nitrogen gas with a flow rate of 8L / min into the air inlet, and form a temporary space for nitrogen gas in the rectangular channel.

[0034] Step 4: Use laser vertical irradiation welding on the high-nitrogen steel plate, the YAG laser power is 3.0KW, and the laser beam defocus...

Embodiment 2

[0035] Example 2 Different shielding gas double-sided shielded welding 12.0mm thick high nitrogen steel

[0036] Step 1: Use an angle grinder to remove the oxide film on the surface of two high-nitrogen steel plates with a thickness of 12.0mm, and then use acetone to remove the surface oil stains. The high-nitrogen steel plates are prefabricated with 30° grooves and 5mm blunt edges, and the welding gap between the two plates of the workpiece to be welded is prefabricated. 0.8mm;

[0037] Step 2: Place two high-nitrogen steel plates on top of the copper plate with a rectangular through-slot in a butt joint form, and fix the workpiece high-nitrogen steel plate and copper plate on the workbench with a clamp.

[0038] Step 3: Introduce nitrogen gas with a flow rate of 10L / min into the air inlet, and form a temporary space for nitrogen gas in the rectangular channel.

[0039]Step 4: Use laser vertical irradiation welding above the metal material to be welded. The YAG laser power i...

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Abstract

The invention provides a high-nitrogen steel hybrid welding method adopting double-sided simultaneous protection with different protective gases and belongs to the technical field of welding. High-nitrogen steel plates are welded through laser-electric arc welding, two to-be-welded workpieces are placed on a copper plate in a butt joint manner, the copper plate is provided with a rectangular through groove, and the to-be-welded workpieces and the copper plate are fixed to a workbench together; a joint interval of the welded pieces is formed between the two to-be-welded workpieces; a laser beamemitted by a laser welding head is coaxial with the interval of the to-be-welded workpieces and perpendicularly irradiate the front faces of the to-be-welded workpieces, and a welding gun is placed on the front side of the to-be-welded workpieces; 95% Ar+5% CO2 mixed protective gases which are output at the same axis with the welding gun are provided above the workpieces; the rectangular throughgroove on the copper plate is located under the welding interval, the opening of the rectangular through groove is upward, nitrogen is fed from the two ends of the opening of the through groove, a gastemporary storage space is defined by the lower surface of the to-be-welded workpieces and the rectangular through groove, the nitrogen in the rectangular through groove can improve nitrogen activityoutside a molten bath and restrain weld porosity and nitrogen loss; and meanwhile, the protective gases on the upper side adopt Ar and CO2, so that molten drops are refined, and the welding process is more stable.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to a laser-arc composite welding method for high nitrogen steel with simultaneous protection on both sides by different shielding gases. Background technique [0002] High-nitrogen austenitic stainless steel (referred to as high-nitrogen steel), the mass fraction of nitrogen generally exceeds 0.4%, mainly uses nitrogen to partially or completely replace nickel to achieve austenitization, because of its good mechanical properties and corrosion resistance It has received widespread attention and has been widely used in the fields of aviation, weaponry, medical treatment and low temperature industry. [0003] High nitrogen steel is used as a structural material, and its weldability is related to the wide application and promotion of high nitrogen steel. When welding high-nitrogen steel under normal pressure, nitrogen is easy to escape and form nitrogen bubbles in the molten pool. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/12B23K26/348
CPCB23K26/125B23K26/348
Inventor 崔博刘凤德刘思聪张福隆张宏
Owner CHANGCHUN UNIV OF SCI & TECH
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